DE4220216C1 - Endoprosthesis - has bio-resorbable distance rings to set gap between prosthesis and bone - Google Patents

Endoprosthesis - has bio-resorbable distance rings to set gap between prosthesis and bone

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Publication number
DE4220216C1
DE4220216C1 DE4220216A DE4220216A DE4220216C1 DE 4220216 C1 DE4220216 C1 DE 4220216C1 DE 4220216 A DE4220216 A DE 4220216A DE 4220216 A DE4220216 A DE 4220216A DE 4220216 C1 DE4220216 C1 DE 4220216C1
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Germany
Prior art keywords
bone
stem
endoprosthesis
prosthesis
spacer
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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DE4220216A
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German (de)
Inventor
Martin Schug
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S&G Implants GmbH
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S&G Implants GmbH
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Priority to DE4220216A priority Critical patent/DE4220216C1/en
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Publication of DE4220216C1 publication Critical patent/DE4220216C1/en
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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30721Accessories
    • A61F2/30724Spacers for centering an implant in a bone cavity, e.g. in a cement-receiving cavity
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L27/00Materials for grafts or prostheses or for coating grafts or prostheses
    • A61L27/50Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
    • A61L27/58Materials at least partially resorbable by the body
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/32Joints for the hip
    • A61F2/36Femoral heads ; Femoral endoprostheses
    • A61F2/3609Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/32Joints for the hip
    • A61F2/36Femoral heads ; Femoral endoprostheses
    • A61F2/3662Femoral shafts
    • A61F2/3676Distal or diaphyseal parts of shafts
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30003Material related properties of the prosthesis or of a coating on the prosthesis
    • A61F2002/30004Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis
    • A61F2002/30032Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis differing in absorbability or resorbability, i.e. in absorption or resorption time
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30003Material related properties of the prosthesis or of a coating on the prosthesis
    • A61F2002/3006Properties of materials and coating materials
    • A61F2002/30062(bio)absorbable, biodegradable, bioerodable, (bio)resorbable, resorptive
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30721Accessories
    • A61F2/30734Modular inserts, sleeves or augments, e.g. placed on proximal part of stem for fixation purposes or wedges for bridging a bone defect
    • A61F2002/30738Sleeves
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/46Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2002/4631Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor the prosthesis being specially adapted for being cemented
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2210/00Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2210/0004Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof bioabsorbable
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2250/00Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0014Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
    • A61F2250/003Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in adsorbability or resorbability, i.e. in adsorption or resorption time
    • A61F2250/0031Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in adsorbability or resorbability, i.e. in adsorption or resorption time made from both resorbable and non-resorbable prosthetic parts, e.g. adjacent parts

Abstract

Endoprosthesis, with a stem for anchoring into human bone tissue, has distance pieces (8, 10) of a bioresorbable material, to set the gap between the stem and the bone, pref. using polymers based on organic acids. USE/ADVANTAGE - The endoprosthesis distance rings maintain the required gap between the stem and the bone during and after surgery, without allowing the metal prosthesis to come into direct contact with the bone, or allowing the distance rings to remain in the body as foreign matter.

Description

Die Erfindung geht aus von einer Endoprothese mit einem Stiel zur Verankerung in einem menschlichen Knochen, und mit mindestens einem Distanzelement zur Festlegung des Zwi­ schenraums zwischen dem Stiel und dem Knochen.The invention is based on an endoprosthesis with a stem for anchoring in a human bone, and with at least one spacer element to determine the interme space between the stem and the bone.

Derartige Endoprothesen sind beispielsweise bekannt aus den US 48 27 919, US 47 18 909, US 45 49 319, US 44 04 692, DE 89 11 046, die einzementierbare Oberschenkelteile von Hüftprothesen betreffen. Die Distanzelemente sitzen auf dem Stiel der Endopro­ these und dienen zur Festlegung eines gleichmäßigen Zwischen­ raums zwischen Endoprothese und Knochen, um einen möglichst gleichmäßig dicken Zementmantel um die Endoprothese herum zu verwirklichen. Derartige bekann­ te Distanzelemente bestehen z. B. aus Polymethylmeta­ crylat (PMMA), sie werden zusammen mit der Endoprothese in den Knochen eingesetzt und verbleiben dort nach der Operation.Endoprostheses of this type are known, for example, from US Pat US 48 27 919, US 47 18 909, US 45 49 319, US 44 04 692, DE 89 11 046, the cementable thigh parts of hip prostheses affect. The spacer elements sit on the handle of the Endopro theses and serve to establish an even intermediate space between endoprosthesis and bone, um  a uniformly thick cement jacket around the To realize endoprosthesis around. Such was known te spacers exist z. B. from polymethylmeta crylate (PMMA), they are used together with the endoprosthesis inserted in the bones and remain there after the Surgery.

Aus der DE 39 12 465 C1 ist es bekannt, Distanzelemente unterhalb des Kragens eines Oberschenkelteils einer Hüftgelenkendoprothese vorzusehen, wobei die Distanz­ elemente an eines Ring aus Kunststoffmaterial angeformt sind, der beim Einzementieren entfernt werden kann, so daß der Zement schließlich auch den ursprünglich von den Distanzelementen eingenommenen Raum ausfüllen kann. Beim Entfernen der Distanzelemente und dem anschließen­ den Befüllen dieses Restvolumens mit Knochenzement läßt sich jedoch eine unerwünschte Positionsänderung der Endoprothese im Knochenhohlraum nicht zuverlässig aus­ schließen, so daß der erwünschte gleichmäßige Zement­ mantel nicht in allen Fällen sicher gewährleistet ist.DE 39 12 465 C1 discloses spacer elements one below the collar of a thigh part Hip joint prosthesis to be provided, the distance elements molded onto a ring made of plastic material that can be removed when cementing, so that the cement was also originally from can fill the space occupied by the spacer elements. When removing the spacers and connect them the filling of this residual volume with bone cement an undesirable change in position of the Endoprosthesis in the bone cavity is not reliable close so that the desired even cement coat is not guaranteed in all cases.

Aus der DE 28 50 586 C2 ist weiterhin eine Einlage bekannt, die zur Endoprothesenverankerung mittels eines Knochenzements in einem Knochenhohlraum dient und eine der Form des Knochenhohlraums angepaßte, für den noch nicht ausgehärteten Knochenzement un­ durchlässige Folie aus resorbierbaren Substanzen enthält. Die Einlage wird nach dem Aushärten des Knochenzements durch Resor­ bierung der eingelagerten Substanzen teilweise durch das einge­ wachsene neue Knochengewebe durchdrungen.From DE 28 50 586 C2 an insert is also known which Endoprosthesis anchoring using a bone cement in one Bone cavity serves and one of the shape of the bone cavity adapted, for the not yet hardened bone cement un contains permeable film of resorbable substances. The After the bone cement has hardened, the insert becomes resor The storage of the substances in part by the penetrated growing new bone tissue.

Aufgabe der Erfindung ist es, eine Endoprothese der eingangs genannten Art derart weiterzubilden, daß die Distanzelemente den gewünschten Abstand zwischen Pro­ these und Knochen während und nach der Operation zu­ verlässig festlegen, ohne daß die metallische Prothese direkt in Berührung mit dem Knochen kommt oder die Distanzelemente als Fremdkörper im Körper verbleiben.The object of the invention is an endoprosthesis type mentioned in such a way that the Distance elements the desired distance between Pro  thesis and bones during and after surgery set reliably without the metallic prosthesis comes into direct contact with the bone or that Spacers remain in the body as foreign bodies.

Diese Aufgabe wird bei der Endoprothese der eingangs genannten Art erfindungsgemäß dadurch gelöst, daß das bzw. die Distanzelemente aus bioresorbierbarem Materi­ al bestehen. This task is the beginning of the endoprosthesis mentioned type according to the invention solved in that the or the spacer elements made of bioabsorbable material al exist.  

Die Vorteile der Erfindung liegen insbesondere darin, daß die Distanzelemente aus einem Material bestehen, welches - in an sich bekannter Weise - bioresorbier­ bar ist und daher im menschlichen Körper, z. B. durch Hydrolyse, allmählich vollständig abgebaut wird. Es ist dadurch gewährleistet, daß die Distanzelemente während und unmittelbar nach der Operation ihre Funk­ tion zuverlässig erfüllen und erst allmählich nach dem Festwerden des Knochenzements abgebaut werden, wobei dann nachwachsendes Knochengewebe die ursprüng­ lich von den Distanzelementen besetzten Volumina aus­ füllt. Auf die bekannten, an der metallischen Endo­ prothese angeformten Distanzelemente, die zu uner­ wünschten Metall/Knochenkontakt führen, sowie auf die bekannten Distanzelemente aus Kunststoffmaterial, die als Fremdkörper im Knochen verbleiben und dort stören können, braucht daher nicht zurückgegriffen zu werden.The advantages of the invention are in particular that the spacer elements consist of a material, which - in a manner known per se - bioresorbier is bar and therefore in the human body, e.g. B. by Hydrolysis, gradually degrading completely. It is ensured that the spacer elements their radio during and immediately after the operation tion reliably and only gradually the setting of the bone cement is broken down, where then renewable bone tissue the original volumes occupied by the spacer elements fills. On the well-known, on the metallic endo prosthetic molded spacers that are too un desired metal / bone contact, as well as on the known spacers made of plastic material, the remain as a foreign body in the bone and interfere there need not be resorted to.

Besonders bevorzugt sind die Distanzelemente an dem Stiel befestigt, z. B. aufgesteckt. Alternativ lassen sich die Distanzelemente auch als Ring ausbilden oder auf einem Ring ausformen, der auf den Stiel auf­ gesteckt wird, um den Zwischenraum zwischen Stiel und Knochen für den Zementmantel zu realisieren.The spacer elements on the Stem attached, e.g. B. attached. Alternatively, leave the spacer elements also form as a ring or form on a ring that is on the stem is stuck to the space between stem and realizing bones for the cement mantle.

Am distalen Ende des Stiels läßt sich das Distanzele­ ment auch als Haube ausbilden, welches auf das freie Stielende aufgesteckt wird.The spacer element can be found at the distal end of the stem ment as a hood, which on the free Stem end is plugged on.

Als bioresorbierbares Material lassen sich z. B. be­ kannte Polymere auf der Basis organischer Säuren, z. B. Derivate der Milchsäure, Glykolsäure sowie deren Copolymere etc. einsetzen, vgl. z. B. die Buchveröffent­ lichung "Macromoleculare Biomaterials", CRC Press 1984, S. 119 bis 142, "Bioresorbable Plastic Materials for Bone Surgery" oder "Clinical Materials" 1986, 1, S. 233 bis 257.As a bioabsorbable material such. B. be known polymers based on organic acids, e.g. B. derivatives of lactic acid, glycolic acid and their Use copolymers etc., cf. e.g. B. the book publisher "Macromolecular Biomaterials", CRC Press 1984,  Pp. 119 to 142, "Bioresorbable Plastic Materials for Bone Surgery "or" Clinical Materials "1986, 1, Pp. 233 to 257.

Vorteilhafte Weiterbildungen der Erfindung sind durch die Merkmale der Unteransprüche gekennzeich­ net.Advantageous developments of the invention are characterized by the features of the subclaims net.

Im folgenden wird ein Ausführungsbeispiel der Er­ findung anhand der Zeichnung näher erläutert.In the following an embodiment of the Er finding explained in more detail with reference to the drawing.

Die Figur zeigt eine Seitenansicht eines Oberschen­ kelteils einer Hüftgelenkprothese.The figure shows a side view of a thigh part of a hip prosthesis.

Das Oberschenkelteil 2 einer Hüftgelenkprothese enthält einen Stiel 4 zur Verankerung der Prothese im Hohlraum des menschlichen Femurknochens. Der Stiel 4 besitzt ein distales, freies Ende 6 und an seinem proximalen Ende einen Kragen 12, der mit seinem Umfang über den Schaft 4 übersteht und an seinem oberen Ende in einen Steckkonus 14 übergeht, auf den ein prothetischer Kopf aufsetzbar ist. Alternativ kann der Kragen 12 auch einstückig in einen Hals mit angeformtem Kopf übergehen, oder der Schaft 4 kann in anderer bekannter Weise mit dem prothetischen Kopf verbunden sein.The thigh part 2 of a hip joint prosthesis contains a stem 4 for anchoring the prosthesis in the cavity of the human femur. The stem 4 has a distal, free end 6 and at its proximal end a collar 12 which projects with its circumference over the shaft 4 and merges at its upper end into a plug-in cone 14 onto which a prosthetic head can be placed. Alternatively, the collar 12 can also merge in one piece into a neck with an integrally formed head, or the shaft 4 can be connected to the prosthetic head in another known manner.

Am distalen Ende 6 des Schafts oder Stiels 4 der Prothese ist ein erstes Distanzelement 8 angeord­ net, das als Haube ausgebildet ist, die auf das distale Ende 6 des Stiels 4 aufgesteckt ist. Das Distanzelement 8 besteht aus bioresorbierbarem Material. At the distal end 6 of the shaft or stem 4 of the prosthesis is a first spacer 8 is angeord net, which is designed as a hood, which is attached to the distal end 6 of the stem 4 . The spacer 8 is made of bioresorbable material.

Unterhalb des Kragens ist ein zweites Distanzelement 10 angeordnet, welches z. B. als Ring 10a mit ange­ formten, nach außen gerichteten Ansätzen 10b ausge­ bildet ist. Das zweite Distanzelement 10 besteht ebenfalls aus bioresorbierbarem Material.Below the collar, a second spacer 10 is arranged, which, for. B. as a ring 10 a with is formed, outward approaches 10 b is formed. The second spacer 10 is also made of bioresorbable material.

Das erste Distanzelement 8 dient zur Positionierung des distalen Stielendes 6 im Knochenhohlraum, während das zweite Distanzelement 10 dazu dient, die Pro­ these im Bereich der Resektionskante gegen den Kno­ chen zu positionieren, um dadurch Raum für einen gleichmäßigen Zwischenraum zu schaffen, der von Knochenzement ausgefüllt werden soll. Als bioresor­ bierbares Material dienen z. B. Polymere auf der Ba­ sis organischer Säuren, z. B. Derivate der Milchsäure, Glykolsäure sowie deren Copolymere.The first spacer 8 is used to position the distal stem end 6 in the bone cavity, while the second spacer 10 is used to position the prosthesis in the area of the resection edge against the bone, thereby creating space for a uniform space filled with bone cement shall be. Ziores serve as bioresor material. B. Polymers based on organic acids, e.g. B. derivatives of lactic acid, glycolic acid and their copolymers.

Claims (7)

1. Endoprothese mit einem Stiel zur Verankerung in einem menschlichen Knochen, und mit mindestens einem Distanzelement zur Festlegung des Zwischenraums zwischen dem Stiel und dem Knochen, dadurch gekennzeichnet, daß das bzw. die Distanzelemente (8, 10) aus bioresorbierbarem Material bestehen.1. Endoprosthesis with a stem for anchoring in a human bone, and with at least one spacer element for defining the space between the stem and the bone, characterized in that the spacer element (s) ( 8 , 10 ) consist of bioresorbable material. 2. Endoprothese nach Anspruch 1, dadurch gekennzeichnet, daß die Distanzelemente (8, 10) an dem Stiel (4) befestigt sind.2. Endoprosthesis according to claim 1, characterized in that the spacer elements ( 8 , 10 ) on the stem ( 4 ) are attached. 3. Endoprothese nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Distanzelemente (8, 10) auf den Stiel (4) aufgesteckt sind.3. Endoprosthesis according to claim 1 or 2, characterized in that the spacer elements ( 8 , 10 ) on the stem ( 4 ) are attached. 4. Endoprothese nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Distanzelemente (10) als Ringe ausgebildet sind, die auf den Stiel (4) aufgesteckt sind.4. Endoprosthesis according to one of the preceding claims, characterized in that the spacer elements ( 10 ) are designed as rings which are attached to the stem ( 4 ). 5. Endoprothese nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß ein Distanzelement (8) als Haube ausgebildet ist, die auf das distale Ende (6) des Stiels (4) aufgesteckt ist.5. Endoprosthesis according to claim 3 or 4, characterized in that a spacer element ( 8 ) is designed as a hood, which is attached to the distal end ( 6 ) of the stem ( 4 ). 6. Endoprothese nach Anspruch 1, dadurch gekennzeichnet, daß die Distanzelemente als Ansätze ausgebildet sind, die am Stiel formschlüssig befe­ stigt sind. 6. Endoprosthesis according to claim 1, characterized in that the spacer elements as Approaches are formed that form-fit on the stem are steady.   7. Endoprothese nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß das bioresorbierbare Ma­ terial Polymere auf der Basis organischer Säuren ent­ hält.7. Endoprosthesis according to one of the preceding claims, characterized in that the bioresorbable Ma terial polymers based on organic acids ent holds.
DE4220216A 1992-06-20 1992-06-20 Endoprosthesis - has bio-resorbable distance rings to set gap between prosthesis and bone Expired - Fee Related DE4220216C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE4220216A DE4220216C1 (en) 1992-06-20 1992-06-20 Endoprosthesis - has bio-resorbable distance rings to set gap between prosthesis and bone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE4220216A DE4220216C1 (en) 1992-06-20 1992-06-20 Endoprosthesis - has bio-resorbable distance rings to set gap between prosthesis and bone

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EP0815809A3 (en) * 1996-06-28 1998-08-12 Johnson & Johnson Professional, Inc. Prosthesis with variable fit and strain distribution
WO1999048445A1 (en) * 1998-03-24 1999-09-30 Depuy International Limited An end cap spacer for a joint prosthesis
EP1419749A1 (en) * 2002-11-18 2004-05-19 Toshinobu Katsuya Distal tip for the positioning of artificial joint stem
WO2004071356A2 (en) * 2003-02-10 2004-08-26 Smith & Nephew, Inc. Resorbable devices
EP1522280A2 (en) * 2003-09-12 2005-04-13 Toshinobu Katsuya Medial/distal tip for artificial joint
US8722783B2 (en) 2006-11-30 2014-05-13 Smith & Nephew, Inc. Fiber reinforced composite material
US9000066B2 (en) 2007-04-19 2015-04-07 Smith & Nephew, Inc. Multi-modal shape memory polymers
US9120919B2 (en) 2003-12-23 2015-09-01 Smith & Nephew, Inc. Tunable segmented polyacetal
US9770534B2 (en) 2007-04-19 2017-09-26 Smith & Nephew, Inc. Graft fixation
US9815240B2 (en) 2007-04-18 2017-11-14 Smith & Nephew, Inc. Expansion moulding of shape memory polymers

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0815809A3 (en) * 1996-06-28 1998-08-12 Johnson & Johnson Professional, Inc. Prosthesis with variable fit and strain distribution
WO1999048445A1 (en) * 1998-03-24 1999-09-30 Depuy International Limited An end cap spacer for a joint prosthesis
EP1419749A1 (en) * 2002-11-18 2004-05-19 Toshinobu Katsuya Distal tip for the positioning of artificial joint stem
WO2004071356A2 (en) * 2003-02-10 2004-08-26 Smith & Nephew, Inc. Resorbable devices
WO2004071356A3 (en) * 2003-02-10 2004-12-23 Smith & Nephew Inc Resorbable devices
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EP1522280A2 (en) * 2003-09-12 2005-04-13 Toshinobu Katsuya Medial/distal tip for artificial joint
US9120919B2 (en) 2003-12-23 2015-09-01 Smith & Nephew, Inc. Tunable segmented polyacetal
US8722783B2 (en) 2006-11-30 2014-05-13 Smith & Nephew, Inc. Fiber reinforced composite material
US9815240B2 (en) 2007-04-18 2017-11-14 Smith & Nephew, Inc. Expansion moulding of shape memory polymers
US9000066B2 (en) 2007-04-19 2015-04-07 Smith & Nephew, Inc. Multi-modal shape memory polymers
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US9770534B2 (en) 2007-04-19 2017-09-26 Smith & Nephew, Inc. Graft fixation

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