US20020151970A1 - Methods and devices for implanting cardiac valves - Google Patents
Methods and devices for implanting cardiac valves Download PDFInfo
- Publication number
- US20020151970A1 US20020151970A1 US10/160,885 US16088502A US2002151970A1 US 20020151970 A1 US20020151970 A1 US 20020151970A1 US 16088502 A US16088502 A US 16088502A US 2002151970 A1 US2002151970 A1 US 2002151970A1
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- valve
- displacer
- carried out
- catheter
- introducing step
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/24—Heart valves ; Vascular valves, e.g. venous valves; Heart implants, e.g. passive devices for improving the function of the native valve or the heart muscle; Transmyocardial revascularisation [TMR] devices; Valves implantable in the body
- A61F2/2412—Heart valves ; Vascular valves, e.g. venous valves; Heart implants, e.g. passive devices for improving the function of the native valve or the heart muscle; Transmyocardial revascularisation [TMR] devices; Valves implantable in the body with soft flexible valve members, e.g. tissue valves shaped like natural valves
- A61F2/2418—Scaffolds therefor, e.g. support stents
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/24—Heart valves ; Vascular valves, e.g. venous valves; Heart implants, e.g. passive devices for improving the function of the native valve or the heart muscle; Transmyocardial revascularisation [TMR] devices; Valves implantable in the body
- A61F2/2427—Devices for manipulating or deploying heart valves during implantation
- A61F2/243—Deployment by mechanical expansion
- A61F2/2433—Deployment by mechanical expansion using balloon catheter
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/24—Heart valves ; Vascular valves, e.g. venous valves; Heart implants, e.g. passive devices for improving the function of the native valve or the heart muscle; Transmyocardial revascularisation [TMR] devices; Valves implantable in the body
- A61F2/2427—Devices for manipulating or deploying heart valves during implantation
- A61F2/2436—Deployment by retracting a sheath
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0008—Fixation appliances for connecting prostheses to the body
- A61F2220/0016—Fixation appliances for connecting prostheses to the body with sharp anchoring protrusions, e.g. barbs, pins, spikes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0058—Additional features; Implant or prostheses properties not otherwise provided for
- A61F2250/0059—Additional features; Implant or prostheses properties not otherwise provided for temporary
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0058—Additional features; Implant or prostheses properties not otherwise provided for
- A61F2250/006—Additional features; Implant or prostheses properties not otherwise provided for modular
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S623/00—Prosthesis, i.e. artificial body members, parts thereof, or aids and accessories therefor
- Y10S623/902—Method of implanting
- Y10S623/904—Heart
Definitions
- the present invention is directed to methods and devices for implanting replacement cardiac valves.
- Replacement cardiac valves are implanted when the patient's native valve exhibits abnormal anatomy and function due to congential or acquired valve disease. Congenital abnormalities can be tolerated for years only to develop into life-threatening problems later. Acquired valve disease may result from various causes such as rheumatic fever, degenerative disorders of the valve tissue, and bacterial or fungal infections.
- Valve dysfunction can be classified as either stenosis, in which the valve does not open properly, or insufficiency, in which the valve does not close properly. Stenosis and insufficiency can occur at the same time and both abnormalities increase the workload on the heart in pumping blood through the body. The ability of the heart to function with the increased workload is a major factor in determining whether the valve should be replaced.
- the patient When the valve must be replaced using conventional methods, the patient must undergo an invasive, traumatic surgical procedure.
- the patient's chest is opened with a median sternotomy or major thoracotomy to provide direct access to the heart through the large opening in the chest.
- the heart is then stopped and the patient is placed on cardiopulmonary bypass using catheters and cannulae inserted directly into the heart and great vessels.
- the heart, or a great vessel leading to the heart is then cut open to access and remove the malfunctioning valve.
- the replacement valve After removing the valve, the replacement valve is then sewn into place.
- the chest is then closed and the patient is weaned off cardiopulmonary bypass support.
- An object of the present invention is to provide additional devices and methods which reduce the trauma associated with conventional open-chest methods and devices for implanting cardiac valves.
- a system and method for implanting a cardiac valve which does not require a median sternotomy or major thoracotomy.
- the devices and methods of the present invention are preferably carried out by passing the valve through a blood vessel, preferably the femoral artery, so that the median sternotomy or major thoracotomy is not required.
- the systems of the present invention also permit introduction of the valve through a small incision between the patient's ribs without cutting the ribs or sternum.
- a valve displacer is used to hold the native valve leaflets open so that the native valve does not need to be removed.
- the valve displacer is preferably introduced into the patient in a collapsed condition and expanded to displace and hold the leaflets open.
- the valve displacer may either be expanded with an expansion mechanism, such as a balloon, or may be self-expanding.
- the valve displacer has a first end, a second end and a central section between the first and second ends. The first and second ends are preferably flared outwardly to form a circumferential recess around the central portion. The native leaflets are trapped within the recess when the valve displacer is deployed.
- the valve is also introduced into the patient in a collapsed condition and expanded within the patient.
- the valve may either be expanded with an expansion mechanism, such as a balloon, or may be self-expanding.
- the cardiac valve may be coupled to the valve displacer or may be positioned independent from the valve displacer while still substantially performing the functions of the native valve.
- a replacement aortic valve may be positioned in the ascending or descending aorta to substantially perform the functions of the native aortic valve.
- the cardiac valve is preferably delivered separate from the valve displacer but may also be integrated with the valve displacer during introduction and deployment.
- the valve has protrusions which engage openings in the valve displacer.
- the valve has sharp elements or barbs which either pierce the native valve tissue or engage the sides of the openings in the valve displacer.
- valve and valve displacer are preferably introduced into the patient with a catheter system.
- the valve displacer is mounted to a first catheter and the valve is mounted to a second catheter which passes through and is slidably coupled to the first catheter.
- the valve displacer and valve may be mounted to a single catheter.
- catheter refers to any catheter, trocar or similar device for introducing medical devices into a patient.
- the valve delivery catheter has a temporary valve mechanism which provides temporary valve functions after deployment of the valve displacer.
- the temporary valve mechanism prevents regurgitation while the native valve is held open and before deployment of the replacement cardiac valve.
- the temporary valve mechanism is preferably a balloon which is inflated and deflated as necessary to permit downstream flow and prevent retrograde flow.
- the devices and methods of the present invention may also be used with the patient's heart stopped and the patient supported by a bypass system.
- FIG. 1A shows a system for implanting a cardiac valve.
- FIG. 1B shows the system of FIG. 1A introduced through a femoral vein.
- FIG. 2 shows the system of FIG. 1 with a sheath retracted to expose the cardiac valve, a valve displacer and a temporary valve mechanism.
- FIG. 3 shows the valve displacer positioned between the native valve leaflets prior to expansion.
- FIG. 4 shows the valve displacer expanded by a first expansion mechanism.
- FIG. 5 shows the valve expanded by a second expansion mechanism into engagement with the valve displacer.
- FIG. 6 shows the valve displacer and valve implanted in the native valve position.
- FIG. 7 shows the valve displacer in the collapsed position.
- FIG. 8 shows the valve displacer in the expanded position.
- FIG. 9 shows the valve and valve displacer in the expanded position.
- FIG. 10 shows the valve in a collapsed condition.
- FIG. 11 is a plan view of the valve showing the leaflets.
- FIG. 12 is a cross-sectional view of the catheter along line A-A of FIG. 5.
- FIG. 13 shows another system for implanting another cardiac valve.
- FIG. 14 is a partial cut-away view of the catheter of FIG. 13 with the valve contained in a chamber.
- FIG. 15 is a cross-sectional view of the catheter along line B-B of FIG. 13.
- FIG. 16 shows another system for implanting a cardiac valve.
- FIG. 17 shows the system of FIG. 16 with a distal portion of the valve displacer extending from the catheter.
- FIG. 18 shows the valve displacer fully deployed to hold the native leaflets open.
- FIG. 19 shows the valve partially expanded with the catheter manipulated so that the valve engages the valve displacer.
- FIG. 20 shows the valve fully deployed and the catheter removed.
- FIG. 21 is a partial cut-away view of the catheter of FIGS. 16 - 19 .
- FIG. 22 is a cross-sectional view of the catheter along line C-C of FIG. 16.
- FIG. 23 shows another system for implanting a cardiac valve with the valve displacer positioned between the native leaflets.
- FIG. 24 shows the valve displacer expanded.
- FIG. 25 shows the valve partially deployed within the valve displacer.
- FIG. 26 shows the valve fully deployed within the valve displacer.
- FIG. 27 shows the valve displacer holding the native leaflets open with the valve deployed in the ascending aorta.
- FIG. 28 shows the valve displacer holding the native leaflets open with the valve deployed in the descending aorta.
- FIG. 29 shows the cardiac valve of FIGS. 23 - 28 in the collapsed condition.
- FIG. 30 shows the cardiac valve of FIGS. 23 - 28 in the expanded condition.
- FIG. 31 shows another system for delivering a cardiac valve with the delivery catheter passing through a trocar in the ascending aorta.
- FIG. 32 shows an expansion mechanism expanding the valve displacer and the valve.
- FIG. 33 shows sutures being pulled to invert the valve.
- FIG. 34 shows the valve being stored in a preservative solution.
- FIG. 35 shows the valve inverted and in the expanded condition.
- FIG. 36 shows the valve and valve displacer in the collapsed condition before being attached to one another.
- FIG. 37 shows the valve and valve displacer attached to one another and mounted to the delivery catheter.
- FIG. 38 shows the valve and the valve displacer in the expanded condition.
- FIG. 39 shows the catheter passing through the femoral vein, into the right atrium, and through the intraatrial septum into the left atrium to access the mitral valve.
- FIGS. 1A, 1B and 2 a system for implanting a replacement cardiac valve is shown.
- the present invention is described in connection with implantation of a replacement aortic valve but is applicable to any other cardiac valve.
- the system 2 includes a delivery catheter 4 , a cardiac valve 6 and a valve displacer 8 .
- a protective sheath 10 covers the delivery catheter 4 , cardiac valve 6 and valve displacer 8 during introduction to prevent contact between the blood vessel and the cardiac valve 6 and valve displacer 8 .
- FIGS. 1A and 1B show the sheath 10 extending around the cardiac valve 6 and valve displacer 8 and
- FIG. 2 shows the sheath 10 retracted to expose the cardiac valve 6 and valve displacer 8 .
- the cardiac valve 6 is preferably introduced through a peripheral vessel such as the femoral artery (FIGS. 1A and 2) or femoral vein (FIG. 1B).
- FIG. 1B shows introduction of the catheter 2 through the femoral vein, into the right atrium, through the intraatrial septum and into the left atrium to access the mitral valve.
- the peripheral vessel is preferably a femoral vessel but may also be the internal jugular vein, subclavian artery, axillary artery, abdominal aorta, descending aorta or any other suitable blood vessel.
- the delivery catheter 4 may be introduced by surgical cutdown or percutaneously using the Seldinger technique.
- An advantage of passing the catheter 4 through a peripheral vessel is reduced trauma to the patient as compared to the conventional open-chest procedure described above.
- the cardiac valve 6 may also be introduced directly into the ascending aorta through a small incision between ribs.
- the system 2 of the present invention is small enough to deliver between the patient's ribs so that the advantages of the present invention over conventional open-chest surgery are provided even when introducing the catheter through an incision in the chest.
- the valve displacer 8 is expanded within the native valve to hold the native cardiac valve leaflets 6 open.
- An advantage of the system 2 and method of the present invention is that the native valve does not need to be removed.
- the replacement cardiac valves described herein may, of course, also be used when removing the native valve rather than using the valve displacer 8 .
- the valve displacer 8 and cardiac valve 6 may be integrated into a single structure and delivered together rather than separately.
- all features of any valve displacer described herein may also form part of any of the cardiac valves described herein without departing from the scope of the invention.
- valve displacer 8 is shown in the collapsed condition in FIGS. 3 and 7 and in the expanded condition in FIGS. 4 and 8. When in the collapsed position, the valve displacer 8 forms a number of longitudinal slots 12 which form openings 14 in the valve displacer 8 when in the expanded condition.
- the valve displacer 8 is substantially cylindrical in the collapsed condition to facilitate introduction into the patient.
- first and second ends 16 , 18 of the valve displacer 8 flare outwardly to form a circumferential recess 24 at a central section 22 .
- the native leaflets are trapped in the recess 24 when the valve displacer 8 is deployed.
- the first end 16 has three extensions 20 extending from the central section 22 .
- the valve displacer 8 may be made of any suitable material and preferred materials include stainless steel, nitinol, keviar, titanium, nylon and composites thereof.
- the valve displacer 8 may also be coated with an antithrombogenic coating.
- the valve displacer 8 is preferably formed from a solid hypotube by etching or micromachining, machining from a solid material, or welding wire elements together.
- valve displacer 8 may have any other suitable shape which holds the leaflets open.
- the valve displacer 8 may also have a fabric cover 17 which can trap calcium fragments which might break free from the valve when the valve displacer is deployed.
- the cover 17 is preferably made of a polyesther knit material, such as dacron, but may be made of any other suitable material.
- the cardiac valve 6 has an expandable support structure 26 which moves from the collapsed position of FIGS. 4 and 10 to the expanded position of FIGS. 5 and 9.
- the support structure 26 is preferably formed with first and second elongate members 28 , 30 which are wound to form windings 31 , preferably about 12-18 windings 31 , around the circumference of the valve 6 .
- the first and second elongate members 28 , 30 are attached to one another at windings 31 which forms three posts 32 extending from the support structure 26 .
- the support structure 26 has a protrusion 34 , preferably three, extending outwardly to form an interrupted lip around an end 35 of the support structure 26 .
- the protrusions 34 engage the openings 14 in the valve displacer 8 as shown in FIG. 9 to secure the cardiac valve 6 to the valve displacer 8 .
- the protrusions 34 are preferably formed by a coil 36 wrapped around the loops 31 in the elongate member 30 .
- the support structure 26 may also have barbs to secure the cardiac valve 6 to the valve displacer 8 or to the blood vessel wall.
- the cardiac valve 6 may also engage the valve displacer 8 with any other suitable connection.
- the posts 32 support a valve portion 38 which performs the functions of the patient's malfunctioning native valve.
- the valve portion 38 is preferably a stentless tissue valve such as a tri-leaflet 39 stentless porcine valve.
- the valve portion 38 has a base 41 which is secured to the support structure 26 with sutures (not shown).
- the valve portion 38 may be stored separately from support structure 26 and attached to the support structure 26 before the procedure.
- the valve portion 38 may also be made of a flexible, synthetic material.
- valve portion 38 may be made of polyurethane similar to the valves described in “A Tricuspid Polyurethane Heart Valve as Alternative to Mechanical Prostheses or Bioprostheses.” by Lo et al., Trans Am Society of Artificial Internal Organs, 1988; 34: pgsvalve displacer 839-844, and “Evaluation of Explanted Polyurethane Trileaflet Cardiac Valve Prostheses,” Journal Thoracic Cardiovascular Surgery, 1988; 94: pgs 419-429.
- the delivery catheter 4 has a temporary valve mechanism 40 which provides temporary valve functions during and/or after deployment of the valve displacer 8 .
- the temporary valve mechanism 40 ensures proper blood flow regulation when the leaflets are held open by the valve displacer 8 to provide time for accurate positioning and deployment of the valve 6 .
- the temporary valve mechanism 40 is preferably a balloon 44 coupled to an inflation mechanism 47 controlled by a control system 42 .
- the control system 42 senses the patient's heartbeat to time balloon inflation and deflation to permit and prevent flow in the same manner as the native valve. Similar systems for synchronizing inflation and deflation of a balloon with the patient's heartbeat are known in balloon pump technology and are described in U.S. Pat. Nos.
- the balloon 44 is preferably inflated with a gas for quick inflation and deflation.
- the temporary valve mechanism 40 is preferably the balloon 44 but may also be a passive mechanical valve which automatically opens and closes due to blood flow forces.
- the catheter 4 may also include an elongate balloon 45 to help pump blood through the patient's body like a blood pump.
- the balloon 45 is also coupled to an inflation mechanism 49 controlled by the control system 42 which inflates and deflates the balloon 45 to provide pumping assistance to the patient's heart.
- Balloon pump technology is described in the above-mentioned patents.
- the elongate balloon 45 may be replaced by any other suitable blood pump, such as a centrifugal pump having an impeller, without departing from the scope of the invention.
- the temporary valve mechanism 40 and balloon 45 are, of course, only necessary when implanting the valve with the patient's heart beating. If the patient's heart is stopped and the patient is supported by a bypass system during the valve implantation procedure, the temporary valve mechanism 40 and/or balloon 45 may be used after the procedure for emergency valve functions or pumping assistance.
- the balloon 44 is preferably positioned in the ascending or descending aorta and the balloon 45 is preferably positioned in the descending aorta.
- the delivery catheter 4 also has first and second expandable members 46 , 48 which deploy the valve displacer 8 and cardiac valve 6 , respectively.
- the expandable members 46 , 48 are preferably balloons 50 , 52 but may also be mechanically actuated devices.
- the balloons 50 , 52 are coupled to inflation lumens 54 , 56 through which inflation fluid is delivered from sources of inflation fluid 58 , 60 , respectively.
- the balloon 50 expands greater at the ends to form the flared ends 16 , 18 of the valve displacer 8 .
- the delivery catheter 4 includes a first catheter 62 , which carries the valve displacer 8 , and a second catheter 64 , which carries the cardiac valve 6 .
- the second catheter 64 has a passageway 66 which receives the first catheter 62 .
- a hemostasis valve 68 permits slidable movement between the first and second catheters 62 , 64 .
- the first catheter 62 has lumen 54 for inflating balloon 50 and the second catheter 64 has lumen 48 for inflating balloon 52 .
- the second catheter 64 also has a lumen 51 for inflating balloon 44 and a lumen 53 for inflating balloon 45 .
- the first catheter 62 also has a main lumen 70 which receives a guidewire 72 .
- the slidable connection between the first and second catheters 62 , 64 permits introduction of the first catheter 62 over the guidewire 72 with the second catheter 64 being advanced over the first catheter 62 after the valve displacer 8 is in the ascending aorta.
- the first catheter 62 may be advanced more easily over the guidewire 72 and through the patient's vasculature, such as around the aortic arch, as compared to a single, multichannel catheter having all features of the first and second catheters 62 , 64 .
- the first and second catheters 62 , 64 may be wire-reinforced (not shown) catheters constructed in the manner described in Published PCT Application WO 97/32623 entitled “Cannula and Method of Manufacture and Use” which is hereby incorporated by reference.
- FIGS. 1 - 6 A method of implanting a cardiac valve 6 in accordance with the present invention is now described in connection with FIGS. 1 - 6 .
- the method is described in connection with the system described above, the method may be practiced with other suitable devices, including the devices and systems described below, without departing from the scope of the invention.
- the method is described in connection with replacing the aortic valve, however, the method may also be applied to other other cardiac valves such as the mitral, tricuspid and pulmonary valves.
- valve displacer 8 Before implanting the cardiac valve 6 , it may be desirable to perform valvuloplasty to break up pathologic adhesions between the native valve leaflets. Breaking up adhesions ensures that the valve displacer 8 expands fully to provide a large blood flow path. Valvuloplasty is preferably performed with a balloon which is inflated to open the leaflets and break the adhesions. The native cardiac valve and annulus are also sized to determine the proper size valve displacer 8 and cardiac valve 6 . Sizing may be carried out using fluoroscopy, intravascular ultrasound or with any other suitable device during or after the valvuloplasty. Size parameters to consider include the cross-sectional profile through the valve, the length and size of the valve leaflets and position of the coronary ostia.
- the delivery catheter 4 is preferably introduced into the patient by surgical cutdown in the femoral artery but may also be introduced percutaneously using the Seldinger technique. As mentioned above, the delivery catheter 4 may also be introduced into any other suitable vessel or through a small incision in the chest.
- the first and second catheters 62 , 64 are advanced into the artery through the cutdown a short distance.
- the guidewire 72 is then advanced ahead of the first and second catheters 62 , 64 up the descending aorta, around the aortic arch, into the ascending aorta and across the aortic valve.
- the first catheter 62 is then advanced over the guidewire 72 to the ascending aorta with the sheath 10 covering the first catheter 62 to prevent contact between the valve displacer 8 and the blood vessel or native valve.
- the second catheter 64 is then advanced over the first catheter 62 to position the cardiac valve 6 in the ascending aorta.
- the sheath 10 also prevents contact between the cardiac valve 6 and vessel wall when advancing the second catheter 64 .
- the sheath 10 is then retracted as shown in FIG. 2 to expose the valve displacer 8 and the cardiac valve 6 .
- valve displacer 8 is then introduced between the valve leaflets as shown in FIG. 3 and the balloon 50 is inflated to expand the valve displacer as shown in FIG. 4.
- the valve displacer 8 holds the native valve leaflets open so that the native valve does not have to be removed.
- the temporary valve mechanism 40 provides temporary valve functions by inflating and deflating the balloon 44 at appropriate times to permit and block flow in the same manner as the native valve.
- the balloon 45 may also be inflated and deflated to provide pumping assistance to the patient's heart during the procedure.
- the second catheter 64 is then advanced until the valve 6 is positioned adjacent the valve displacer 8 .
- FIG. 5 shows the first catheter 62 extending into the left ventricle
- the first catheter 62 may also be designed to be withdrawn into the passageway 66 of the second catheter 64 so that the first catheter 62 does not extend beyond the second catheter 64 .
- the balloon 52 is then partially inflated so that the distal end of the valve 6 having the protrusions 34 expands.
- the second catheter 64 is then manipulated until the protrusions 34 engage the openings 14 in the valve displacer 8 .
- the balloon 52 is then inflated further to expand the rest of the support structure 26 .
- the catheters 62 , 64 are then removed leaving the cardiac valve 6 in place.
- FIGS. 13 and 14 another system 2 A for implanting a cardiac valve 6 A is shown wherein the same or similar reference numbers refer to the same or similar structures.
- the cardiac valve 6 A is similar to the cardiac valve 6 described above, however, the cardiac valve 6 A is self-expanding and, therefore, does not require an independent expansion mechanism.
- the support structure 26 A is made of a resilient material to naturally bias the support structure 26 A to the expanded position.
- the support structure 26 A may be made of any suitable material and preferred materials are stainless steel or shape-memory alloys such as nitinol.
- Delivery catheter 4 A has the expandable member 46 , which is preferably the balloon 50 , for expanding the valve displacer 8 .
- the cardiac valve 6 A is contained within an outer wall 74 of the delivery catheter 4 A.
- the cardiac valve 6 A is advanced out of a chamber 76 in the delivery catheter 4 A by advancing a rod 78 having a pusher element 80 attached thereto.
- the pusher element 80 engages the posts 82 on the cardiac valve 6 A to move the cardiac valve 6 A out of the chamber 76 .
- the rod 78 has threaded connections 80 , 82 with a tip 84 and the pusher element 80 to facilitate assembling the delivery catheter 4 A and loading the cardiac valve 6 A in the chamber 76 .
- the rod 78 has a guidewire lumen 86 for receiving the guidewire 72 . Referring to the cross-sectional view of FIG.
- the catheter 4 A has a first lumen 88 coupled to the balloon 50 , a second lumen 90 coupled to the balloon 44 and a third lumen 91 coupled to the balloon 45 .
- the second and third lumens 88 , 90 are coupled to the inflation mechanisms 47 , 29 which are controlled by the control system 42 described in connection with FIGS. 1 and 2.
- the system 2 A preferably includes the sheath 10 which prevents contact between the blood vessel and the valve displacer 8 when the catheter 4 A is advanced through the blood vessel.
- the cardiac valve 6 A is implanted in substantially the same manner as the cardiac valve 6 and the discussion of implantation of the cardiac valve 6 is also applicable here.
- the delivery catheter 4 A may be introduced in any manner described herein and FIG. 13 shows the catheter 4 A extending through the femoral artery with the valve displacer 8 positioned between the valve leaflets prior to expansion.
- the valve displacer 8 is expanded in the manner explained above to hold the leaflets open.
- the catheter 4 A is retraced a predetermined amount so that the protrusions 34 are exposed outside the distal end of the catheter 4 A.
- the catheter 4 A may then be manipulated as necessary so that the protrusions 34 engage the openings 14 in the valve displacer 8 .
- the valve 6 A preferably remains coupled to the catheter 4 A while the protrusions 34 are exposed for manipulation of the valve 6 A until the valve 6 A engages the valve displacer 8 . After the valve 6 A has engaged the valve displacer 8 , the rod 78 is then advanced far enough to completely release the cardiac valve 6 A.
- FIGS. 16 - 22 another system 4 B for implanting the cardiac valve 4 A is shown wherein the same or similar reference numbers refer to the same or similar structure.
- the system has the self-expanding cardiac valve 4 A described above.
- the valve displacer 8 B is similar to the valve displacer 8 described above, however, the valve displacer 8 B is also self-expanding and, therefore, does not require an independent expansion mechanism.
- the valve displacer 8 B is made of a resilient material to naturally bias the valve displacer 8 B to the expanded position.
- the valve displacer 8 B may be made of any suitable material and preferred materials are stainless steel and shape-memory alloys such as nitinol.
- the valve displacer SB and cardiac valve 6 A are contained within an outer wall 74 of the delivery catheter 4 B as shown in FIG. 21.
- the valve displacer 8 B and cardiac valve 4 A are advanced out of a chamber 76 B in the delivery catheter 4 B by advancing a rod 78 B having first and second pusher elements 80 B. 81 B attached thereto.
- the rod 78 B has threaded connections 79 B. 82 B, and 83 B with the tip 84 and the first and second pusher elements 80 B. 81 B to facilitate assembling catheter 4 B and loading the valve displacer 8 B and cardiac valve 6 A in the chamber 76 B.
- the rod 78 B has the guidewire lumen 86 for receiving the guidewire 72 (FIG. 14). Referring to FIG.
- the catheter 4 B has a lumen 90 coupled to the balloon 44 which serves as the temporary valve mechanism 40 and a lumen 93 which is coupled to the balloon 45 .
- the lumen 90 and lumen 93 are coupled to the inflation mechanisms 47 , 29 which are controlled by the control system 42 (FIGS. 1A, 1B, and 2 ).
- FIGS. 16 - 20 Another method of implanting a cardiac valve is now described with reference to FIGS. 16 - 20 wherein the same or similar reference numbers refer to the same or similar struture.
- the method describes use of the delivery catheter 4 B and cardiac valve 6 A, however, the method may be practiced using other suitable structures.
- the delivery catheter 4 B is introduced in any manner described above and is preferably introduced through the femoral artery.
- the guidewire 72 is advanced ahead of the catheter 4 B into the ascending aorta and the delivery catheter 4 B is advanced over the guidewire 72 .
- the delivery catheter 4 B is then advanced between the valve leaflets.
- a distal end of the valve displacer 8 B is then advanced out of the chamber 76 and the catheter 4 B is retracted until the valve displacer 8 contacts the valve opening.
- the catheter 4 B is then retracted while the rod 78 B is maintained in the same position so that the valve displacer 8 B emerges from the chamber 76 B as shown in FIG. 18.
- the catheter 4 B is then advanced a predetermined amount and the rod is advanced to force a distal end of the valve 6 A from the chamber 76 B.
- the catheter 4 B is then moved as necessary so that the protrusions 34 engage the openings 14 in the valve displacer 8 as shown in FIG. 19.
- the catheter 4 B is then withdrawn further so that the support structure 26 A expands to the fully deployed position of FIG. 20.
- the catheter 4 B is then removed leaving the cardiac valve 6 A as shown in FIG. 20 During the procedure described above, the temporary valve mechanism 40 provides temporary valve functions while the balloon 45 provides pumping assistance as described above.
- FIGS. 23 - 30 another system 2 C for implanting a cardiac valve 6 C is shown.
- the system 2 C includes the valve displacer 8 and delivery catheter 4 described above.
- the delivery catheter 4 has the balloon 50 for inflating the valve displacer 8 , the balloon 52 for inflating a cardiac valve 6 C, the temporary valve mechanism 40 and the balloon 45 .
- the cardiac valve 6 C is similar to the cardiac valves 6 , 6 A except that the cardiac valve 6 C has barbs 100 which extend outwardly from the cardiac valve 6 C in the expanded condition of FIG. 30. The barbs 100 secure the cardiac valve 6 C to the valve displacer 8 or directly to the vessel wall.
- the cardiac valve 6 C has depressions 102 so that the barbs 100 are recessed from an outer surface 104 of the cardiac valve 6 C when in the collapsed position of FIG. 29.
- the depressions 102 prevent the barbs 100 from interfering with smooth retraction of the sheath 10 .
- the cardiac valve 6 C is expanded, the depressions 102 and barbs 100 rotate and move outwardly to engage the valve displacer 8 or vessel wall.
- FIG. 23 shows the delivery catheter 4 passing through the femoral artery.
- the valve displacer 8 is deployed in the manner described above wherein the valve displacer 8 is introduced into the valve leaflets and expanded with the balloon 50 to hold the native leaflets open as shown in FIG. 24.
- the delivery catheter 4 may then be advanced so that the cardiac valve 6 C is expanded in the valve displacer 8 with the barbs 100 passing into the openings 14 to secure the cardiac valve 6 C to the valve displacer 8 as shown in FIGS. 25 and 26.
- the barbs 100 may be long enough to pierce and anchor in the native valve leaflets or may be designed to merely pass into and engage the sides of the openings 14 .
- cardiac valve refers to a valve which substantially replaces the function of the patient's malfunctioning cardiac valve.
- the valve may be positioned in the native valve position or may be positioned in a different location while still substantially performing the functions of the native valve.
- a replacement aortic valve may be positioned superior to the coronary ostia, in the aortic arch or in the descending aorta. Such a replacement valve will substantially function like the patient's native aortic valve. Referring to FIGS. 27 and 28 the cardiac valve 6 C is deployed in the ascending and descending aorta with the barbs 100 securing the cardiac valve 6 C directly to the vessel wall.
- FIGS. 31 - 38 another system 2 D for introducing a valve 6 D is shown wherein similar or the same reference numbers refer to similar or the same structure.
- the valve 6 D is coupled to a valve displacer 8 D prior to introduction into the patient.
- the valve 6 D has an expandable support structure 26 D which is movable from the collapsed position of FIGS. 36 and 37 to the expanded position of FIGS. 34 and 35 .
- the support structure 26 D has flexible joints 106 which bend to radially collapse the support structure 26 D.
- the support structure 26 D has protrusions 34 D which engage holes 108 in the valve displacer 8 D.
- the valve 6 D and valve displacer 8 D may engage one another in any other suitable manner.
- valve 6 D is inverted before being attached to the valve displacer 8 D as shown in FIG. 35.
- a number of sutures 110 are then passed through the valve 6 D.
- the sutures 110 are used to invert the valve after introduction into the patient as will be explained below.
- the valve 6 D may be any of the valves described herein or any other suitable valve without departing from the scope of the invention.
- a circumferential ring 111 extends around the support structure 26 D.
- the ring 111 is preferably made of stainless steel or shape-memory alloy such as nitinol and provides circumferential support of the valve against the aortic wall for hemostasis.
- the valve displacer 8 D is mounted to a delivery catheter 4 D having a balloon 112 for expanding the valve displacer 8 D and valve 6 D.
- the balloon 112 is coupled to a source of inflation fluid 114 (FIG. 31) for inflating the balloon 112 .
- the catheter 4 D passes through a trocar 116 having a hemostasis valve 117 .
- the sutures 110 and the catheter 4 D pass through the hemostasis valve which permits slidable movements of the sutures 110 and catheter 4 D.
- valve 6 D is preferably stored in a preservative solution until just before the procedure as shown in FIG. 34.
- the valve is then inverted as shown in FIG. 35 and the sutures 110 are passed through the valve 6 D.
- the valve 6 D is then attached to the valve displacer 8 D as shown in FIG. 37 and mounted to the delivery catheter 4 D.
- the valve 6 D may be delivered in any manner described above and is preferably introduced through an incision in the patient's chest. Referring to FIGS. 31 and 32, the trocar 116 is introduced into the ascending aorta through purse-string sutures (not shown). The trocar 116 may have a chamber (not shown) in which the valve 6 D is positioned when the trocar 116 is introduced into the ascending aorta.
- the sheath 10 (see FIGS. 1A, 1B and 2 ) described above may also be used to prevent contact between the valve and trocar and between the valve and the aortic wall.
- the valve 6 D is preferably introduced with the patient's heart beating but may also be implanted with the patient's heart stopped and the patient supported by a bypass system.
- system 2 D does not show the balloons 40 and 45 , it is understood that the balloons 40 , 45 may also be used with system 2 D without departing from the scope of the invention.
- valve 6 D After introduction of the trocar 116 , the valve 6 D is advanced until the valve 6 D is between the native valve leaflets.
- the balloon 112 is then inflated to expand the valve 6 D and valve displacer 8 D.
- the catheter 4 D is then removed and the sutures 110 are pulled to invert the valve 6 D as shown in FIG. 33. An end of each suture 110 is then pulled to remove the sutures 110 .
- the trocar 116 and catheter 4 D are then removed leaving the valve 6 D (FIG. 38).
- the native valve may be removed rather than held open with the valve displacer
- the replacement cardiac valve may be a completely synthetic or mechanical valve
- the expansion mechanism may be a mechanical mechanism rather than a balloon.
Abstract
The valve implantation system has a valve displacer for displacing and holding the native valve leaflets open in a first aspect of the invention. A replacement valve may be attached to the valve displacer before or after introduction and may be positioned independent of the valve displacer. In another aspect of the invention, the valve displacer and valve are in a collapsed condition during introduction and are expanded to deploy the valve displacer and valve. The valve is a tissue valve mounted to an expandable support structure. The support structure may have protrusions for engaging the valve displacer or barbs for anchoring the valve displacer to the heart or blood vessel. A temporary valve mechanism may be used to provide temporary valve functions during and after deployment of the valve displacer.
Description
- The present invention is directed to methods and devices for implanting replacement cardiac valves. Replacement cardiac valves are implanted when the patient's native valve exhibits abnormal anatomy and function due to congential or acquired valve disease. Congenital abnormalities can be tolerated for years only to develop into life-threatening problems later. Acquired valve disease may result from various causes such as rheumatic fever, degenerative disorders of the valve tissue, and bacterial or fungal infections.
- Valve dysfunction can be classified as either stenosis, in which the valve does not open properly, or insufficiency, in which the valve does not close properly. Stenosis and insufficiency can occur at the same time and both abnormalities increase the workload on the heart in pumping blood through the body. The ability of the heart to function with the increased workload is a major factor in determining whether the valve should be replaced.
- When the valve must be replaced using conventional methods, the patient must undergo an invasive, traumatic surgical procedure. The patient's chest is opened with a median sternotomy or major thoracotomy to provide direct access to the heart through the large opening in the chest. The heart is then stopped and the patient is placed on cardiopulmonary bypass using catheters and cannulae inserted directly into the heart and great vessels. The heart, or a great vessel leading to the heart, is then cut open to access and remove the malfunctioning valve. After removing the valve, the replacement valve is then sewn into place. After the new valve has been implanted, the chest is then closed and the patient is weaned off cardiopulmonary bypass support.
- The conventional open-chest surgery described above is problematic in that it is highly invasive, traumatic and requires a lengthy recovery time. These drawbacks to conventional open-chest surgery prevent some patients from undergoing a valve implantation procedure even though a new cardiac valve is needed.
- U.S. Pat. No. 5,370,685. U.S. Pat. No. 5,411,552 and U.S. Pat. No. 5,718,725, which are hereby incorporated by reference, describe devices and methods for implanting a new cardiac valve without requiring a median sternotomy or major thoracotomy. Such devices and methods reduce the pain, trauma and recovery time as compared to conventional open-chest surgery.
- An object of the present invention is to provide additional devices and methods which reduce the trauma associated with conventional open-chest methods and devices for implanting cardiac valves.
- In accordance with the object of the invention, a system and method for implanting a cardiac valve is provided which does not require a median sternotomy or major thoracotomy. The devices and methods of the present invention are preferably carried out by passing the valve through a blood vessel, preferably the femoral artery, so that the median sternotomy or major thoracotomy is not required. Alternatively, the systems of the present invention also permit introduction of the valve through a small incision between the patient's ribs without cutting the ribs or sternum.
- In a first aspect of the invention, a valve displacer is used to hold the native valve leaflets open so that the native valve does not need to be removed. The valve displacer is preferably introduced into the patient in a collapsed condition and expanded to displace and hold the leaflets open. The valve displacer may either be expanded with an expansion mechanism, such as a balloon, or may be self-expanding. In a preferred embodiment, the valve displacer has a first end, a second end and a central section between the first and second ends. The first and second ends are preferably flared outwardly to form a circumferential recess around the central portion. The native leaflets are trapped within the recess when the valve displacer is deployed.
- In another aspect of the invention, the valve is also introduced into the patient in a collapsed condition and expanded within the patient. The valve may either be expanded with an expansion mechanism, such as a balloon, or may be self-expanding. The cardiac valve may be coupled to the valve displacer or may be positioned independent from the valve displacer while still substantially performing the functions of the native valve. For instance, a replacement aortic valve may be positioned in the ascending or descending aorta to substantially perform the functions of the native aortic valve.
- The cardiac valve is preferably delivered separate from the valve displacer but may also be integrated with the valve displacer during introduction and deployment. In a preferred embodiment, the valve has protrusions which engage openings in the valve displacer. In another embodiment, the valve has sharp elements or barbs which either pierce the native valve tissue or engage the sides of the openings in the valve displacer.
- In yet another aspect of the present invention, the valve and valve displacer are preferably introduced into the patient with a catheter system. In a preferred system, the valve displacer is mounted to a first catheter and the valve is mounted to a second catheter which passes through and is slidably coupled to the first catheter. Alternatively, the valve displacer and valve may be mounted to a single catheter. The term catheter as used herein refers to any catheter, trocar or similar device for introducing medical devices into a patient.
- In still another aspect of the present invention, the valve delivery catheter has a temporary valve mechanism which provides temporary valve functions after deployment of the valve displacer. The temporary valve mechanism prevents regurgitation while the native valve is held open and before deployment of the replacement cardiac valve. The temporary valve mechanism is preferably a balloon which is inflated and deflated as necessary to permit downstream flow and prevent retrograde flow. Although it is preferred to implant the cardiac valve while the patient's heart is beating, the devices and methods of the present invention may also be used with the patient's heart stopped and the patient supported by a bypass system.
- These and other advantages and aspects of the invention will become evident from the following description of the preferred embodiments and claims.
- FIG. 1A shows a system for implanting a cardiac valve.
- FIG. 1B shows the system of FIG. 1A introduced through a femoral vein.
- FIG. 2 shows the system of FIG. 1 with a sheath retracted to expose the cardiac valve, a valve displacer and a temporary valve mechanism.
- FIG. 3 shows the valve displacer positioned between the native valve leaflets prior to expansion.
- FIG. 4 shows the valve displacer expanded by a first expansion mechanism.
- FIG. 5 shows the valve expanded by a second expansion mechanism into engagement with the valve displacer.
- FIG. 6 shows the valve displacer and valve implanted in the native valve position.
- FIG. 7 shows the valve displacer in the collapsed position.
- FIG. 8 shows the valve displacer in the expanded position.
- FIG. 9 shows the valve and valve displacer in the expanded position.
- FIG. 10 shows the valve in a collapsed condition.
- FIG. 11 is a plan view of the valve showing the leaflets.
- FIG. 12 is a cross-sectional view of the catheter along line A-A of FIG. 5.
- FIG. 13 shows another system for implanting another cardiac valve.
- FIG. 14 is a partial cut-away view of the catheter of FIG. 13 with the valve contained in a chamber.
- FIG. 15 is a cross-sectional view of the catheter along line B-B of FIG. 13.
- FIG. 16 shows another system for implanting a cardiac valve.
- FIG. 17 shows the system of FIG. 16 with a distal portion of the valve displacer extending from the catheter.
- FIG. 18 shows the valve displacer fully deployed to hold the native leaflets open.
- FIG. 19 shows the valve partially expanded with the catheter manipulated so that the valve engages the valve displacer.
- FIG. 20 shows the valve fully deployed and the catheter removed.
- FIG. 21 is a partial cut-away view of the catheter of FIGS.16-19.
- FIG. 22 is a cross-sectional view of the catheter along line C-C of FIG. 16.
- FIG. 23 shows another system for implanting a cardiac valve with the valve displacer positioned between the native leaflets.
- FIG. 24 shows the valve displacer expanded.
- FIG. 25 shows the valve partially deployed within the valve displacer.
- FIG. 26 shows the valve fully deployed within the valve displacer.
- FIG. 27 shows the valve displacer holding the native leaflets open with the valve deployed in the ascending aorta.
- FIG. 28 shows the valve displacer holding the native leaflets open with the valve deployed in the descending aorta.
- FIG. 29 shows the cardiac valve of FIGS.23-28 in the collapsed condition.
- FIG. 30 shows the cardiac valve of FIGS.23-28 in the expanded condition.
- FIG. 31 shows another system for delivering a cardiac valve with the delivery catheter passing through a trocar in the ascending aorta.
- FIG. 32 shows an expansion mechanism expanding the valve displacer and the valve.
- FIG. 33 shows sutures being pulled to invert the valve.
- FIG. 34 shows the valve being stored in a preservative solution.
- FIG. 35 shows the valve inverted and in the expanded condition.
- FIG. 36 shows the valve and valve displacer in the collapsed condition before being attached to one another.
- FIG. 37 shows the valve and valve displacer attached to one another and mounted to the delivery catheter.
- FIG. 38 shows the valve and the valve displacer in the expanded condition.
- FIG. 39 shows the catheter passing through the femoral vein, into the right atrium, and through the intraatrial septum into the left atrium to access the mitral valve.
- Referring to FIGS. 1A, 1B and2 a system for implanting a replacement cardiac valve is shown. The present invention is described in connection with implantation of a replacement aortic valve but is applicable to any other cardiac valve. The
system 2 includes adelivery catheter 4, a cardiac valve 6 and avalve displacer 8. Aprotective sheath 10 covers thedelivery catheter 4, cardiac valve 6 andvalve displacer 8 during introduction to prevent contact between the blood vessel and the cardiac valve 6 andvalve displacer 8. FIGS. 1A and 1B show thesheath 10 extending around the cardiac valve 6 andvalve displacer 8 and FIG. 2 shows thesheath 10 retracted to expose the cardiac valve 6 andvalve displacer 8. - The cardiac valve6 is preferably introduced through a peripheral vessel such as the femoral artery (FIGS. 1A and 2) or femoral vein (FIG. 1B). FIG. 1B shows introduction of the
catheter 2 through the femoral vein, into the right atrium, through the intraatrial septum and into the left atrium to access the mitral valve. The peripheral vessel is preferably a femoral vessel but may also be the internal jugular vein, subclavian artery, axillary artery, abdominal aorta, descending aorta or any other suitable blood vessel. As will be explained below, thedelivery catheter 4 may be introduced by surgical cutdown or percutaneously using the Seldinger technique. An advantage of passing thecatheter 4 through a peripheral vessel is reduced trauma to the patient as compared to the conventional open-chest procedure described above. Although it is preferred to deliver the cardiac valve 6 through a peripheral vessel, the cardiac valve 6 may also be introduced directly into the ascending aorta through a small incision between ribs. Thesystem 2 of the present invention is small enough to deliver between the patient's ribs so that the advantages of the present invention over conventional open-chest surgery are provided even when introducing the catheter through an incision in the chest. - The
valve displacer 8 is expanded within the native valve to hold the native cardiac valve leaflets 6 open. An advantage of thesystem 2 and method of the present invention is that the native valve does not need to be removed. The replacement cardiac valves described herein may, of course, also be used when removing the native valve rather than using thevalve displacer 8. Furthermore, thevalve displacer 8 and cardiac valve 6 may be integrated into a single structure and delivered together rather than separately. Thus, all features of any valve displacer described herein may also form part of any of the cardiac valves described herein without departing from the scope of the invention. - The
valve displacer 8 is shown in the collapsed condition in FIGS. 3 and 7 and in the expanded condition in FIGS. 4 and 8. When in the collapsed position, thevalve displacer 8 forms a number oflongitudinal slots 12 which formopenings 14 in thevalve displacer 8 when in the expanded condition. Thevalve displacer 8 is substantially cylindrical in the collapsed condition to facilitate introduction into the patient. - Referring to FIG. 8, first and second ends16, 18 of the
valve displacer 8 flare outwardly to form acircumferential recess 24 at acentral section 22. The native leaflets are trapped in therecess 24 when thevalve displacer 8 is deployed. Thefirst end 16 has threeextensions 20 extending from thecentral section 22. Thevalve displacer 8 may be made of any suitable material and preferred materials include stainless steel, nitinol, keviar, titanium, nylon and composites thereof. Thevalve displacer 8 may also be coated with an antithrombogenic coating. Thevalve displacer 8 is preferably formed from a solid hypotube by etching or micromachining, machining from a solid material, or welding wire elements together. Although it is preferred to provide the flared ends 16, 18, thevalve displacer 8 may have any other suitable shape which holds the leaflets open. Thevalve displacer 8 may also have afabric cover 17 which can trap calcium fragments which might break free from the valve when the valve displacer is deployed. Thecover 17 is preferably made of a polyesther knit material, such as dacron, but may be made of any other suitable material. - The cardiac valve6 has an
expandable support structure 26 which moves from the collapsed position of FIGS. 4 and 10 to the expanded position of FIGS. 5 and 9. Thesupport structure 26 is preferably formed with first and secondelongate members windings 31, preferably about 12-18windings 31, around the circumference of the valve 6. The first and secondelongate members windings 31 which forms threeposts 32 extending from thesupport structure 26. - The
support structure 26 has aprotrusion 34, preferably three, extending outwardly to form an interrupted lip around anend 35 of thesupport structure 26. Theprotrusions 34 engage theopenings 14 in thevalve displacer 8 as shown in FIG. 9 to secure the cardiac valve 6 to thevalve displacer 8. Theprotrusions 34 are preferably formed by acoil 36 wrapped around theloops 31 in theelongate member 30. As will be described below, thesupport structure 26 may also have barbs to secure the cardiac valve 6 to thevalve displacer 8 or to the blood vessel wall. The cardiac valve 6 may also engage thevalve displacer 8 with any other suitable connection. - The
posts 32 support avalve portion 38 which performs the functions of the patient's malfunctioning native valve. Referring to FIGS. 10 and 11, thevalve portion 38 is preferably a stentless tissue valve such as a tri-leaflet 39 stentless porcine valve. Thevalve portion 38 has a base 41 which is secured to thesupport structure 26 with sutures (not shown). Thevalve portion 38 may be stored separately fromsupport structure 26 and attached to thesupport structure 26 before the procedure. Although it is preferred to provide a tissue valve for thevalve portion 38, thevalve portion 38 may also be made of a flexible, synthetic material. For example, thevalve portion 38 may be made of polyurethane similar to the valves described in “A Tricuspid Polyurethane Heart Valve as Alternative to Mechanical Prostheses or Bioprostheses.” by Lo et al., Trans Am Society of Artificial Internal Organs, 1988; 34: pgsvalve displacer 839-844, and “Evaluation of Explanted Polyurethane Trileaflet Cardiac Valve Prostheses,” Journal Thoracic Cardiovascular Surgery, 1988; 94: pgs 419-429. - Referring to FIGS.2-4, the
delivery catheter 4 has atemporary valve mechanism 40 which provides temporary valve functions during and/or after deployment of thevalve displacer 8. Thetemporary valve mechanism 40 ensures proper blood flow regulation when the leaflets are held open by thevalve displacer 8 to provide time for accurate positioning and deployment of the valve 6. Thetemporary valve mechanism 40 is preferably aballoon 44 coupled to aninflation mechanism 47 controlled by acontrol system 42. Thecontrol system 42 senses the patient's heartbeat to time balloon inflation and deflation to permit and prevent flow in the same manner as the native valve. Similar systems for synchronizing inflation and deflation of a balloon with the patient's heartbeat are known in balloon pump technology and are described in U.S. Pat. Nos. 5,817,001, 5,413,549 and 5,254,097 which are hereby incorporated by reference. Theballoon 44 is preferably inflated with a gas for quick inflation and deflation. Thetemporary valve mechanism 40 is preferably theballoon 44 but may also be a passive mechanical valve which automatically opens and closes due to blood flow forces. - The
catheter 4 may also include anelongate balloon 45 to help pump blood through the patient's body like a blood pump. Theballoon 45 is also coupled to aninflation mechanism 49 controlled by thecontrol system 42 which inflates and deflates theballoon 45 to provide pumping assistance to the patient's heart. Balloon pump technology is described in the above-mentioned patents. Theelongate balloon 45 may be replaced by any other suitable blood pump, such as a centrifugal pump having an impeller, without departing from the scope of the invention. - The
temporary valve mechanism 40 andballoon 45 are, of course, only necessary when implanting the valve with the patient's heart beating. If the patient's heart is stopped and the patient is supported by a bypass system during the valve implantation procedure, thetemporary valve mechanism 40 and/orballoon 45 may be used after the procedure for emergency valve functions or pumping assistance. Theballoon 44 is preferably positioned in the ascending or descending aorta and theballoon 45 is preferably positioned in the descending aorta. - Referring to FIGS.3-6, the
delivery catheter 4 also has first and secondexpandable members valve displacer 8 and cardiac valve 6, respectively. Theexpandable members balloons inflation lumens inflation fluid balloon 50 expands greater at the ends to form the flared ends 16, 18 of thevalve displacer 8. - The
delivery catheter 4 includes afirst catheter 62, which carries thevalve displacer 8, and asecond catheter 64, which carries the cardiac valve 6. Referring to FIGS. 2 and 12, thesecond catheter 64 has apassageway 66 which receives thefirst catheter 62. Ahemostasis valve 68 permits slidable movement between the first andsecond catheters first catheter 62 haslumen 54 for inflatingballoon 50 and thesecond catheter 64 haslumen 48 for inflatingballoon 52. Thesecond catheter 64 also has alumen 51 for inflatingballoon 44 and alumen 53 for inflatingballoon 45. Thefirst catheter 62 also has amain lumen 70 which receives aguidewire 72. - The slidable connection between the first and
second catheters first catheter 62 over theguidewire 72 with thesecond catheter 64 being advanced over thefirst catheter 62 after thevalve displacer 8 is in the ascending aorta. In this manner, thefirst catheter 62 may be advanced more easily over theguidewire 72 and through the patient's vasculature, such as around the aortic arch, as compared to a single, multichannel catheter having all features of the first andsecond catheters second catheters - A method of implanting a cardiac valve6 in accordance with the present invention is now described in connection with FIGS. 1-6. Although the method is described in connection with the system described above, the method may be practiced with other suitable devices, including the devices and systems described below, without departing from the scope of the invention. Furthermore, the method is described in connection with replacing the aortic valve, however, the method may also be applied to other other cardiac valves such as the mitral, tricuspid and pulmonary valves.
- Before implanting the cardiac valve6, it may be desirable to perform valvuloplasty to break up pathologic adhesions between the native valve leaflets. Breaking up adhesions ensures that the
valve displacer 8 expands fully to provide a large blood flow path. Valvuloplasty is preferably performed with a balloon which is inflated to open the leaflets and break the adhesions. The native cardiac valve and annulus are also sized to determine the propersize valve displacer 8 and cardiac valve 6. Sizing may be carried out using fluoroscopy, intravascular ultrasound or with any other suitable device during or after the valvuloplasty. Size parameters to consider include the cross-sectional profile through the valve, the length and size of the valve leaflets and position of the coronary ostia. - The
delivery catheter 4 is preferably introduced into the patient by surgical cutdown in the femoral artery but may also be introduced percutaneously using the Seldinger technique. As mentioned above, thedelivery catheter 4 may also be introduced into any other suitable vessel or through a small incision in the chest. The first andsecond catheters guidewire 72 is then advanced ahead of the first andsecond catheters first catheter 62 is then advanced over theguidewire 72 to the ascending aorta with thesheath 10 covering thefirst catheter 62 to prevent contact between thevalve displacer 8 and the blood vessel or native valve. Thesecond catheter 64 is then advanced over thefirst catheter 62 to position the cardiac valve 6 in the ascending aorta. Thesheath 10 also prevents contact between the cardiac valve 6 and vessel wall when advancing thesecond catheter 64. Thesheath 10 is then retracted as shown in FIG. 2 to expose thevalve displacer 8 and the cardiac valve 6. - The
valve displacer 8 is then introduced between the valve leaflets as shown in FIG. 3 and theballoon 50 is inflated to expand the valve displacer as shown in FIG. 4. Thevalve displacer 8 holds the native valve leaflets open so that the native valve does not have to be removed. When thevalve displacer 8 has been deployed, thetemporary valve mechanism 40 provides temporary valve functions by inflating and deflating theballoon 44 at appropriate times to permit and block flow in the same manner as the native valve. Theballoon 45 may also be inflated and deflated to provide pumping assistance to the patient's heart during the procedure. Although the above-described method is performed with the patient's heart beating, the procedure may also be performed on a stopped heart with the patient supported by a bypass system. - The
second catheter 64 is then advanced until the valve 6 is positioned adjacent thevalve displacer 8. Although FIG. 5 shows thefirst catheter 62 extending into the left ventricle, thefirst catheter 62 may also be designed to be withdrawn into thepassageway 66 of thesecond catheter 64 so that thefirst catheter 62 does not extend beyond thesecond catheter 64. Theballoon 52 is then partially inflated so that the distal end of the valve 6 having theprotrusions 34 expands. Thesecond catheter 64 is then manipulated until theprotrusions 34 engage theopenings 14 in thevalve displacer 8. Theballoon 52 is then inflated further to expand the rest of thesupport structure 26. Thecatheters - Referring to FIGS. 13 and 14, another
system 2A for implanting acardiac valve 6A is shown wherein the same or similar reference numbers refer to the same or similar structures. Thecardiac valve 6A is similar to the cardiac valve 6 described above, however, thecardiac valve 6A is self-expanding and, therefore, does not require an independent expansion mechanism. Thesupport structure 26A is made of a resilient material to naturally bias thesupport structure 26A to the expanded position. Thesupport structure 26A may be made of any suitable material and preferred materials are stainless steel or shape-memory alloys such as nitinol.Delivery catheter 4A has theexpandable member 46, which is preferably theballoon 50, for expanding thevalve displacer 8. - The
cardiac valve 6A is contained within anouter wall 74 of thedelivery catheter 4A. Thecardiac valve 6A is advanced out of achamber 76 in thedelivery catheter 4A by advancing arod 78 having apusher element 80 attached thereto. Thepusher element 80 engages theposts 82 on thecardiac valve 6A to move thecardiac valve 6A out of thechamber 76. Therod 78 has threadedconnections tip 84 and thepusher element 80 to facilitate assembling thedelivery catheter 4A and loading thecardiac valve 6A in thechamber 76. Therod 78 has aguidewire lumen 86 for receiving theguidewire 72. Referring to the cross-sectional view of FIG. 15, thecatheter 4A has afirst lumen 88 coupled to theballoon 50, asecond lumen 90 coupled to theballoon 44 and a third lumen 91 coupled to theballoon 45. The second andthird lumens inflation mechanisms 47, 29 which are controlled by thecontrol system 42 described in connection with FIGS. 1 and 2. Thesystem 2A preferably includes thesheath 10 which prevents contact between the blood vessel and thevalve displacer 8 when thecatheter 4A is advanced through the blood vessel. - The
cardiac valve 6A is implanted in substantially the same manner as the cardiac valve 6 and the discussion of implantation of the cardiac valve 6 is also applicable here. Thedelivery catheter 4A may be introduced in any manner described herein and FIG. 13 shows thecatheter 4A extending through the femoral artery with thevalve displacer 8 positioned between the valve leaflets prior to expansion. Thevalve displacer 8 is expanded in the manner explained above to hold the leaflets open. After thevalve displacer 8 has been expanded, thecatheter 4A is retraced a predetermined amount so that theprotrusions 34 are exposed outside the distal end of thecatheter 4A. Thecatheter 4A may then be manipulated as necessary so that theprotrusions 34 engage theopenings 14 in thevalve displacer 8. Thevalve 6A preferably remains coupled to thecatheter 4A while theprotrusions 34 are exposed for manipulation of thevalve 6A until thevalve 6A engages thevalve displacer 8. After thevalve 6A has engaged thevalve displacer 8, therod 78 is then advanced far enough to completely release thecardiac valve 6A. - Referring to FIGS.16-22, another
system 4B for implanting thecardiac valve 4A is shown wherein the same or similar reference numbers refer to the same or similar structure. The system has the self-expandingcardiac valve 4A described above. Thevalve displacer 8B is similar to thevalve displacer 8 described above, however, thevalve displacer 8B is also self-expanding and, therefore, does not require an independent expansion mechanism. Thevalve displacer 8B is made of a resilient material to naturally bias thevalve displacer 8B to the expanded position. Thevalve displacer 8B may be made of any suitable material and preferred materials are stainless steel and shape-memory alloys such as nitinol. - The valve displacer SB and
cardiac valve 6A are contained within anouter wall 74 of thedelivery catheter 4B as shown in FIG. 21. Thevalve displacer 8B andcardiac valve 4A are advanced out of achamber 76B in thedelivery catheter 4B by advancing arod 78B having first and second pusher elements 80B. 81B attached thereto. Therod 78B has threadedconnections 79B. 82B, and 83B with thetip 84 and the first and second pusher elements 80B. 81B to facilitate assemblingcatheter 4B and loading thevalve displacer 8B andcardiac valve 6A in thechamber 76B. Therod 78B has theguidewire lumen 86 for receiving the guidewire 72 (FIG. 14). Referring to FIG. 16 and the cross-sectional view of FIG. 22, thecatheter 4B has alumen 90 coupled to theballoon 44 which serves as thetemporary valve mechanism 40 and alumen 93 which is coupled to theballoon 45. Thelumen 90 andlumen 93 are coupled to theinflation mechanisms 47, 29 which are controlled by the control system 42 (FIGS. 1A, 1B, and 2). - Another method of implanting a cardiac valve is now described with reference to FIGS.16-20 wherein the same or similar reference numbers refer to the same or similar struture. The method describes use of the
delivery catheter 4B andcardiac valve 6A, however, the method may be practiced using other suitable structures. Thedelivery catheter 4B is introduced in any manner described above and is preferably introduced through the femoral artery. Theguidewire 72 is advanced ahead of thecatheter 4B into the ascending aorta and thedelivery catheter 4B is advanced over theguidewire 72. Thedelivery catheter 4B is then advanced between the valve leaflets. A distal end of thevalve displacer 8B is then advanced out of thechamber 76 and thecatheter 4B is retracted until thevalve displacer 8 contacts the valve opening. Thecatheter 4B is then retracted while therod 78B is maintained in the same position so that thevalve displacer 8B emerges from thechamber 76B as shown in FIG. 18. Thecatheter 4B is then advanced a predetermined amount and the rod is advanced to force a distal end of thevalve 6A from thechamber 76B. Thecatheter 4B is then moved as necessary so that theprotrusions 34 engage theopenings 14 in thevalve displacer 8 as shown in FIG. 19. Thecatheter 4B is then withdrawn further so that thesupport structure 26A expands to the fully deployed position of FIG. 20. Thecatheter 4B is then removed leaving thecardiac valve 6A as shown in FIG. 20 During the procedure described above, thetemporary valve mechanism 40 provides temporary valve functions while theballoon 45 provides pumping assistance as described above. - Referring to FIGS.23-30, another
system 2C for implanting acardiac valve 6C is shown. Thesystem 2C includes thevalve displacer 8 anddelivery catheter 4 described above. Thedelivery catheter 4 has theballoon 50 for inflating thevalve displacer 8, theballoon 52 for inflating acardiac valve 6C, thetemporary valve mechanism 40 and theballoon 45. Thecardiac valve 6C is similar to thecardiac valves 6, 6A except that thecardiac valve 6C hasbarbs 100 which extend outwardly from thecardiac valve 6C in the expanded condition of FIG. 30. Thebarbs 100 secure thecardiac valve 6C to thevalve displacer 8 or directly to the vessel wall. Thecardiac valve 6C hasdepressions 102 so that thebarbs 100 are recessed from anouter surface 104 of thecardiac valve 6C when in the collapsed position of FIG. 29. Thedepressions 102 prevent thebarbs 100 from interfering with smooth retraction of thesheath 10. When thecardiac valve 6C is expanded, thedepressions 102 andbarbs 100 rotate and move outwardly to engage thevalve displacer 8 or vessel wall. - The
system 2C is introduced into the patient in any manner described above and FIG. 23 shows thedelivery catheter 4 passing through the femoral artery. Thevalve displacer 8 is deployed in the manner described above wherein thevalve displacer 8 is introduced into the valve leaflets and expanded with theballoon 50 to hold the native leaflets open as shown in FIG. 24. Thedelivery catheter 4 may then be advanced so that thecardiac valve 6C is expanded in thevalve displacer 8 with thebarbs 100 passing into theopenings 14 to secure thecardiac valve 6C to thevalve displacer 8 as shown in FIGS. 25 and 26. Thebarbs 100 may be long enough to pierce and anchor in the native valve leaflets or may be designed to merely pass into and engage the sides of theopenings 14. - The term “cardiac valve” as used herein refers to a valve which substantially replaces the function of the patient's malfunctioning cardiac valve. The valve may be positioned in the native valve position or may be positioned in a different location while still substantially performing the functions of the native valve. For example, a replacement aortic valve may be positioned superior to the coronary ostia, in the aortic arch or in the descending aorta. Such a replacement valve will substantially function like the patient's native aortic valve. Referring to FIGS. 27 and 28 the
cardiac valve 6C is deployed in the ascending and descending aorta with thebarbs 100 securing thecardiac valve 6C directly to the vessel wall. - Referring to FIGS.31-38 another
system 2D for introducing avalve 6D is shown wherein similar or the same reference numbers refer to similar or the same structure. Thevalve 6D is coupled to avalve displacer 8D prior to introduction into the patient. Thevalve 6D has anexpandable support structure 26D which is movable from the collapsed position of FIGS. 36 and 37 to the expanded position of FIGS. 34 and 35. Thesupport structure 26D hasflexible joints 106 which bend to radially collapse thesupport structure 26D. Thesupport structure 26D hasprotrusions 34D which engageholes 108 in thevalve displacer 8D. Thevalve 6D andvalve displacer 8D may engage one another in any other suitable manner. - The
valve 6D is inverted before being attached to thevalve displacer 8D as shown in FIG. 35. A number ofsutures 110, preferably three, are then passed through thevalve 6D. Thesutures 110 are used to invert the valve after introduction into the patient as will be explained below. Thevalve 6D may be any of the valves described herein or any other suitable valve without departing from the scope of the invention. Acircumferential ring 111 extends around thesupport structure 26D. Thering 111 is preferably made of stainless steel or shape-memory alloy such as nitinol and provides circumferential support of the valve against the aortic wall for hemostasis. - The
valve displacer 8D is mounted to a delivery catheter 4D having aballoon 112 for expanding thevalve displacer 8D andvalve 6D. Theballoon 112 is coupled to a source of inflation fluid 114 (FIG. 31) for inflating theballoon 112. The catheter 4D passes through atrocar 116 having ahemostasis valve 117. Thesutures 110 and the catheter 4D pass through the hemostasis valve which permits slidable movements of thesutures 110 and catheter 4D. - The
valve 6D is preferably stored in a preservative solution until just before the procedure as shown in FIG. 34. The valve is then inverted as shown in FIG. 35 and thesutures 110 are passed through thevalve 6D. Thevalve 6D is then attached to thevalve displacer 8D as shown in FIG. 37 and mounted to the delivery catheter 4D. - The
valve 6D may be delivered in any manner described above and is preferably introduced through an incision in the patient's chest. Referring to FIGS. 31 and 32, thetrocar 116 is introduced into the ascending aorta through purse-string sutures (not shown). Thetrocar 116 may have a chamber (not shown) in which thevalve 6D is positioned when thetrocar 116 is introduced into the ascending aorta. The sheath 10 (see FIGS. 1A, 1B and 2) described above may also be used to prevent contact between the valve and trocar and between the valve and the aortic wall. Thevalve 6D is preferably introduced with the patient's heart beating but may also be implanted with the patient's heart stopped and the patient supported by a bypass system. Althoughsystem 2D does not show theballoons balloons system 2D without departing from the scope of the invention. - After introduction of the
trocar 116, thevalve 6D is advanced until thevalve 6D is between the native valve leaflets. Theballoon 112 is then inflated to expand thevalve 6D andvalve displacer 8D. The catheter 4D is then removed and thesutures 110 are pulled to invert thevalve 6D as shown in FIG. 33. An end of eachsuture 110 is then pulled to remove thesutures 110. Thetrocar 116 and catheter 4D are then removed leaving thevalve 6D (FIG. 38). - Although the foregoing invention has been described by way of illustration and example of preferred embodiments for purposes of clarity and understanding, changes and modifications to the preferred embodiments may be incorporated without departing from the scope of the invention. For example, the native valve may be removed rather than held open with the valve displacer, the replacement cardiac valve may be a completely synthetic or mechanical valve, and the expansion mechanism may be a mechanical mechanism rather than a balloon.
Claims (29)
1. A method of implanting a cardiac valve, comprising the steps of:
introducing a valve and a valve displacer into a patient, the valve and valve displacer being movable from collapsed positions to expanded positions, the valve and valve displacer being introduced into the patient in the collapsed position;
positioning the valve displacer between valve leaflets of a native cardiac valve;
expanding the valve displacer to the expanded position after the positioning step thereby displacing and holding the valve leaflets in an open position; and
securing the valve at a desired location in the patient.
2. The method of claim 1 , wherein:
the securing step is carried out with the replacement valve being secured to the valve displacer.
3 The method of claim 2 , wherein:
the securing step is carried out with the valve interlocking with the valve displacer.
4. The method of claim 2 , wherein:
the securing step is carried out with the valve having sharp elements which penetrate the native valve.
5. The method of claim 1 , wherein:
the introducing step is carried out with the valve having a support structure and a valve portion, the support structure being expandable from a collapsed position to an expanded position, the introducing step being carried out with the support structure being in the collapsed position.
6. The method of claim 1 , wherein:
the securing step is carried out with the desired valve location being spaced apart from the valve displacer.
7. The method of claim 6 , wherein:
the securing step is carried out with the desired location of the valve being between the coronary ostia and the brachiocephalic artery.
8. The method of claim 1 , wherein:
the introducing step is carried out with the valve displacer being mounted to a catheter.
9. The method of claim 8 , further comprising the step of:
enclosing the valve displacer in a flexible sheath during the introducing step; and
uncovering the valve displacer before the expanding step.
10. The method of claim 8 , wherein:
the introducing step is carried out with the catheter passing through a penetration in the aortic arch.
11. The method of claim 8 , wherein:
the introducing step is carried out through the femoral artery.
12. The method of claim 1 , wherein:
the introducing step is carried out with the valve being mounted on a catheter.
13. The method of claim 8 , wherein:
the introducing step is carried out with the catheter having an expandable member, the valve displacer being mounted to the expandable member.
14. The method of claim 12 , wherein:
the introducing step is carried out with the catheter having a valve mechanism.
15. The method of claim 12 , wherein:
the introducing step is carried out with the catheter having a balloon, the balloon being coupled to a control mechanism for inflating and deflating the balloon to provide pumping assistance to the patient's heart.
16. The method of claim 1 , wherein:
the introducing step is carried out with the valve displacer being mounted on a catheter.
17. The method of claim 16 , wherein:
the introducing step is carried out with the catheter having an expandable member, the valve displacer being mounted to the expandable member.
18. The method of claim 14 , wherein:
the introducing step is carried out the valve displacer having an end which flares outwardly when the valve displacer is in the expanded position.
19. The method of claim 1 , wherein:
the introducing step is carried out with the valve displacer having a circumferential recess formed between the first end and a second end.
20. The method of claim 1 , wherein:
the securing step is carried out before the introducing step so that the valve and valve displacment device are introduced together.
21. The method of claim 20 , further comprising the step of:
inverting the valve after the introducing step.
22. The method of claim 1 , wherein:
the valve introducing step is carried out with the valve having an expandable support structure, the expandable support structure having at least three posts extending from the expandable support structure.
23. A device for maintaining a patient's native valve leaflets open, comprising:
a first end;
a second end; and
a central section extending between the first and second ends;
the first and second ends being flared outwardly from the central section so that the central section forms a recess for receiving the native valve leaflets, the first end, second end and central section forming a structure which is movable from a collapsed condition to an expanded condition.
24. The device of claim 23 , wherein:
the first end, second end and central section are integrally formed.
25. The device of claim 23 , wherein:
the structure is substantially cylindrical in the collapsed condition, the first and second ends flaring outwardly from the central section when the structure is in expanded condition.
26. The device of claim 23 , wherein:
the structure has a circumferential recess for retaining the native valve leaflets, the circumferential recess extending around the central section.
27. The device of claim 23 , further comprising:
a valve portion attached to at least one of the first end, second end and central section, the valve portion permitting blood flow therethrough in one direction and preventing flow in the other direction.
28. The device of claim 27 , wherein:
the valve portion is a tissue valve.
29. The device of claim 27 , wherein:
the valve portion lockingly engages at least one of the first end, second end and central section.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US10/160,885 US20020151970A1 (en) | 1999-02-10 | 2002-06-03 | Methods and devices for implanting cardiac valves |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US09/248,911 US6425916B1 (en) | 1999-02-10 | 1999-02-10 | Methods and devices for implanting cardiac valves |
US10/160,885 US20020151970A1 (en) | 1999-02-10 | 2002-06-03 | Methods and devices for implanting cardiac valves |
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US09/248,911 Division US6425916B1 (en) | 1999-02-10 | 1999-02-10 | Methods and devices for implanting cardiac valves |
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US20020151970A1 true US20020151970A1 (en) | 2002-10-17 |
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US09/248,911 Expired - Lifetime US6425916B1 (en) | 1999-02-10 | 1999-02-10 | Methods and devices for implanting cardiac valves |
US10/160,885 Abandoned US20020151970A1 (en) | 1999-02-10 | 2002-06-03 | Methods and devices for implanting cardiac valves |
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US09/248,911 Expired - Lifetime US6425916B1 (en) | 1999-02-10 | 1999-02-10 | Methods and devices for implanting cardiac valves |
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EP (1) | EP1164976A4 (en) |
JP (1) | JP4233765B2 (en) |
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Also Published As
Publication number | Publication date |
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AU2987500A (en) | 2000-08-29 |
WO2000047139A1 (en) | 2000-08-17 |
CA2360185C (en) | 2008-12-30 |
JP4233765B2 (en) | 2009-03-04 |
EP1164976A1 (en) | 2002-01-02 |
US6425916B1 (en) | 2002-07-30 |
AU767751B2 (en) | 2003-11-20 |
CA2360185A1 (en) | 2000-08-17 |
WO2000047139A9 (en) | 2001-09-13 |
JP2002536115A (en) | 2002-10-29 |
EP1164976A4 (en) | 2005-03-16 |
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