US20060271048A1 - Pedicle screw based vertebral body stabilization apparatus - Google Patents
Pedicle screw based vertebral body stabilization apparatus Download PDFInfo
- Publication number
- US20060271048A1 US20060271048A1 US11/128,962 US12896205A US2006271048A1 US 20060271048 A1 US20060271048 A1 US 20060271048A1 US 12896205 A US12896205 A US 12896205A US 2006271048 A1 US2006271048 A1 US 2006271048A1
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- United States
- Prior art keywords
- pedicle screw
- spacer
- superior
- inferior
- channel
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7002—Longitudinal elements, e.g. rods
- A61B17/7011—Longitudinal element being non-straight, e.g. curved, angled or branched
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7002—Longitudinal elements, e.g. rods
- A61B17/7019—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other
- A61B17/7026—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other with a part that is flexible due to its form
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7002—Longitudinal elements, e.g. rods
- A61B17/7019—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other
- A61B17/7022—Tethers, i.e. longitudinal elements capable of transmitting tension only, e.g. straps, sutures or cables
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7002—Longitudinal elements, e.g. rods
- A61B17/7019—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other
- A61B17/7031—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other made wholly or partly of flexible material
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00831—Material properties
- A61B2017/00867—Material properties shape memory effect
Definitions
- the present invention relates to vertebral body stabilization and support and, more particularly, to a pedicle screw based system providing flex restrictions on vertebral bodies.
- Surgical techniques to correct or address spinal problems are turning more and more to non-fusion technologies.
- One type technology involves spinous process stabilization.
- Spinous process stabilization is further explained in U.S. patent application Ser. No. 10/______ filed, May 12, 2005, titled SPINAL STABILIZATION, which application is incorporated herein as if set out in full.
- Another similar technology comprises using conventional pedicle screws.
- One conventional pedicle based stabilization system includes a pedicle screw platform threaded into at least a superior and inferior pedicle. Stabilizing cords a placed and spacers inserted between sets of pedicle screws. Once everything is placed, the cords are tightened.
- some pedicle screw stabilization devices provide tracks to allow some movement.
- the spacer may have elongated slots or tracks on the superior and/or inferior end the spacer to move relative to the pedicle screw, which allows for some relative movement between the superior and inferior vertebrae.
- the track provides more flex than the spacer/cord systems, but provides abrupt stops in both directions.
- a pedicle screw based spinal stabilization apparatus uses materials specifically designed to dampen the movement to provide a gentle stop.
- the apparatus comprises a superior pedicle screw and an inferior pedicle screw.
- a spacer coupled to the superior pedicle screw and inferior pedicle screw allows compression and expansion of the vertebral bodies. At least a part of the spacer comprises elastic portion that dampens compression and expansion of the spacer to provide a relatively gentle stop to motion
- FIG. 1 shows a superior view of a vertebral body
- FIG. 2 shows an elevation view of the vertebral body of FIG. 1 ;
- FIG. 3 shows a superior vertebral body and an inferior vertebral body with a pedicle screw based spacer consistent with an embodiment of the present invention
- FIG. 4 shows a pedicle screw and anchor consistent with an embodiment of the present invention.
- FIG. 5 shows a possible shape of a portion of the spacer of FIG. 3 .
- FIG. 1 shows a superior view of a vertebral body 100 (i.e., looking down the spinal column).
- the vertebral body 100 comprises, among other parts, the pedicles 102 , the facets 104 , the lamina 106 , and the spinous process 108 .
- FIG. 2 shows a side elevation view of vertebral body 100 with a pedicle 102 , the facet 104 , lamina 106 , and spinal process 106 .
- FIG. 3 shows a side elevation view of a superior vertebral body 302 and an inferior vertebral body 304 (not shown to scale and slightly exploded for ease of reference) with a pedicle screw stabilization device 300 .
- vertebral bodies 302 and 304 comprise the superior pedicle 306 and the inferior pedicle 308 .
- An intervertebral disk 310 typically exists in intervertebral space 312 , but may be removed and/or replace by artificial discs, grafts, or the like.
- Device 300 comprises a superior pedicle screw 320 and an inferior pedicle screw 322 .
- a spacer 324 is coupled to the pedicle screws.
- Spacer 324 includes a elastic/damper portion 326 that allows some expansion and contraction between the vertebral bodies. While shown as a single piece, spacer 324 could be multiple pieces. When multiple pieces are provided, parts may provide dampening in one or both directions as desired. Portion 326 is shown centrally located on spacer 324 , but could be located elsewhere and/or be the entire spacer 324 . In either direction, the resistance to the motion would increase to provide a relatively gentle stop to the motion instead of the abrupt stop associated with conventional stabilization devices.
- Spacer 324 could be made our of polymers or other biocompatible material, but it is preferred to construct spacer 324 from shaped memory alloys because of their bone like, elastic qualities at conventional body temperatures. Spacer 324 could be attached to pedicle screws 320 and 322 in any conventional manner. Moreover, while show as a single level stabilization, device 300 could be used for multiple level stabilization.
- a band 330 can be used to further inhibit flex of the spine.
- Band 330 can be wrapped about superior pedicle screw 320 and inferior pedicle screw 322 .
- band 330 can be wrapped about other parts of the vertebral body.
- band 330 could be wrapped about the spinous process of superior vertebral body 302 and the spinous process of the inferior vertebral body 304 as shown in phantom.
- Band 330 could be any conventional biocompatible material, such as, for example, metals, shaped memory alloys, polymers, PEEK, or the like.
- Band 330 could be a circular, elliptical, or other shape band or attach similar to a “C” clamp or the like such that band 330 only has a single side.
- FIG. 4 shows a top and side view of pedicle screw 400 and anchor 402 to which a spacer 324 may be attached.
- Anchor 402 has a bone engaging surface 404 and a top 406 opposite the bone engaging 404 .
- a bore 405 extends from the top 406 to the bone engaging surface 404 .
- a channel 408 extends from the top 406 towards bone engaging surface 404 .
- Channel 408 is designed to fit spacer 324 .
- Channel 408 may be open on two sides of anchor 402 , similar to a spinal rod system, or open on a single side of anchor 402 (as shown).
- thread 450 may be coated with bone growth materials 452 , as those materials are conventionally understood in the art.
- the pedicle screws may include bone growth channels 454 to promote bone growth through the pedicle screws. Channels 454 may be coated and/or packed with bone growth material.
- the pedicle screws may be similar to bone growth cages. The bone growth should prompt fusing the pedicle screw to the bone.
- FIG. 5 shows an optional and possible construction of spacer 324 and/or portion 326 to facilitate expansion and compression of spacer 324 .
- FIG. 5 shows an accordion shape section 500 .
- Section 500 can expand in direction A on application of tension.
- Section 500 can compress in direction B on application of compression.
- Using an accordion shape as section 500 becomes more elongated and/or more compact, the force resisting movement increases to provide a dampening effect.
- the dampening effect provides a more gentle stop than conventional pedicle screw based stabilization devices.
Abstract
Description
- The present invention relates to vertebral body stabilization and support and, more particularly, to a pedicle screw based system providing flex restrictions on vertebral bodies.
- Surgical techniques to correct or address spinal problems are turning more and more to non-fusion technologies. One type technology involves spinous process stabilization. Spinous process stabilization is further explained in U.S. patent application Ser. No. 10/______ filed, May 12, 2005, titled SPINAL STABILIZATION, which application is incorporated herein as if set out in full. Another similar technology comprises using conventional pedicle screws.
- One conventional pedicle based stabilization system includes a pedicle screw platform threaded into at least a superior and inferior pedicle. Stabilizing cords a placed and spacers inserted between sets of pedicle screws. Once everything is placed, the cords are tightened.
- Conventional pedicle based systems, such as the one explained above, provide adequate support, however, any flex of the system is abruptly stopped by either the cord or the spacer. Even if the spacer provides for some flex, the cord provides an abrupt stop in the opposite direction.
- Instead of the screw, spacer cord based systems, some pedicle screw stabilization devices provide tracks to allow some movement. For example, the spacer may have elongated slots or tracks on the superior and/or inferior end the spacer to move relative to the pedicle screw, which allows for some relative movement between the superior and inferior vertebrae. The track provides more flex than the spacer/cord systems, but provides abrupt stops in both directions.
- Thus, it would be desirous to develop a pedicle screw based spinal stabilization apparatus that provide a dampened stop.
- To attain the advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, a pedicle screw based spinal stabilization apparatus is provided. The apparatus uses materials specifically designed to dampen the movement to provide a gentle stop. The apparatus comprises a superior pedicle screw and an inferior pedicle screw. A spacer coupled to the superior pedicle screw and inferior pedicle screw allows compression and expansion of the vertebral bodies. At least a part of the spacer comprises elastic portion that dampens compression and expansion of the spacer to provide a relatively gentle stop to motion
- The foregoing and other features, utilities and advantages of the invention will be apparent from the following more particular description of a preferred embodiment of the invention as illustrated in the accompanying drawings.
- The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present invention, and together with the description, serve to explain the principles thereof. Like items in the drawings are referred to using the same numerical reference.
-
FIG. 1 shows a superior view of a vertebral body; -
FIG. 2 shows an elevation view of the vertebral body ofFIG. 1 ; -
FIG. 3 shows a superior vertebral body and an inferior vertebral body with a pedicle screw based spacer consistent with an embodiment of the present invention; -
FIG. 4 shows a pedicle screw and anchor consistent with an embodiment of the present invention; and -
FIG. 5 shows a possible shape of a portion of the spacer ofFIG. 3 . - The present invention will now be described with reference to FIGS. 1 to 5. Referring first to
FIGS. 1 and 2 , avertebral body 100 is shown for reference.FIG. 1 shows a superior view of a vertebral body 100 (i.e., looking down the spinal column). Thevertebral body 100 comprises, among other parts, thepedicles 102, thefacets 104, thelamina 106, and thespinous process 108.FIG. 2 shows a side elevation view ofvertebral body 100 with apedicle 102, thefacet 104,lamina 106, andspinal process 106. -
FIG. 3 shows a side elevation view of a superiorvertebral body 302 and an inferior vertebral body 304 (not shown to scale and slightly exploded for ease of reference) with a pediclescrew stabilization device 300. For reference,vertebral bodies superior pedicle 306 and theinferior pedicle 308. Anintervertebral disk 310 typically exists inintervertebral space 312, but may be removed and/or replace by artificial discs, grafts, or the like. -
Device 300 comprises asuperior pedicle screw 320 and aninferior pedicle screw 322. Aspacer 324 is coupled to the pedicle screws.Spacer 324 includes a elastic/damper portion 326 that allows some expansion and contraction between the vertebral bodies. While shown as a single piece,spacer 324 could be multiple pieces. When multiple pieces are provided, parts may provide dampening in one or both directions as desired.Portion 326 is shown centrally located onspacer 324, but could be located elsewhere and/or be theentire spacer 324. In either direction, the resistance to the motion would increase to provide a relatively gentle stop to the motion instead of the abrupt stop associated with conventional stabilization devices.Spacer 324 could be made our of polymers or other biocompatible material, but it is preferred to constructspacer 324 from shaped memory alloys because of their bone like, elastic qualities at conventional body temperatures.Spacer 324 could be attached topedicle screws device 300 could be used for multiple level stabilization. - Optionally, a
band 330 can be used to further inhibit flex of the spine.Band 330 can be wrapped aboutsuperior pedicle screw 320 andinferior pedicle screw 322. Alternatively,band 330 can be wrapped about other parts of the vertebral body. For example,band 330 could be wrapped about the spinous process of superiorvertebral body 302 and the spinous process of the inferiorvertebral body 304 as shown in phantom.Band 330 could be any conventional biocompatible material, such as, for example, metals, shaped memory alloys, polymers, PEEK, or the like.Band 330 could be a circular, elliptical, or other shape band or attach similar to a “C” clamp or the like such thatband 330 only has a single side. -
FIG. 4 shows a top and side view ofpedicle screw 400 andanchor 402 to which aspacer 324 may be attached. Anchor 402 has a boneengaging surface 404 and a top 406 opposite the bone engaging 404. Abore 405 extends from thetop 406 to the boneengaging surface 404. Achannel 408 extends from the top 406 towards boneengaging surface 404. Channel 408 is designed to fitspacer 324. Channel 408 may be open on two sides ofanchor 402, similar to a spinal rod system, or open on a single side of anchor 402 (as shown). Asetscrew 410 havingfirst threads 412 it threaded onto corresponding threads 414 inbore 405 tocouple spacer 324 topedicle screw 400 andanchor 402. To facilitate the pedicle screws being permanently threaded into pedicles,thread 450 may be coated with bone growth materials 452, as those materials are conventionally understood in the art. Moreover, the pedicle screws may includebone growth channels 454 to promote bone growth through the pedicle screws.Channels 454 may be coated and/or packed with bone growth material. As one of skill in the art would now recognize, the pedicle screws may be similar to bone growth cages. The bone growth should prompt fusing the pedicle screw to the bone. - As mentioned above,
spacer 324 and/orportion 326 could be constructed out of a number of materials to provide elastic movement in multiple directions.FIG. 5 shows an optional and possible construction ofspacer 324 and/orportion 326 to facilitate expansion and compression ofspacer 324.FIG. 5 shows anaccordion shape section 500.Section 500 can expand in direction A on application of tension.Section 500 can compress in direction B on application of compression. Using an accordion shape, assection 500 becomes more elongated and/or more compact, the force resisting movement increases to provide a dampening effect. The dampening effect provides a more gentle stop than conventional pedicle screw based stabilization devices. - While the invention has been particularly shown and described with reference to an embodiment thereof, it will be understood by those skilled in the art that various other changes in the form and details may be made without departing from the spirit and scope of the invention.
Claims (23)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/128,962 US20060271048A1 (en) | 2005-05-12 | 2005-05-12 | Pedicle screw based vertebral body stabilization apparatus |
US11/383,326 US7942904B2 (en) | 2005-05-12 | 2006-05-15 | Pedicle screw based vertebral body stabilization apparatus |
US11/549,675 US7828830B2 (en) | 2005-05-12 | 2006-10-16 | Dynamic spinal stabilization |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/128,962 US20060271048A1 (en) | 2005-05-12 | 2005-05-12 | Pedicle screw based vertebral body stabilization apparatus |
US11/383,326 US7942904B2 (en) | 2005-05-12 | 2006-05-15 | Pedicle screw based vertebral body stabilization apparatus |
Related Child Applications (3)
Application Number | Title | Priority Date | Filing Date |
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US11/128,960 Continuation-In-Part US20060271055A1 (en) | 2005-05-12 | 2005-05-12 | Spinal stabilization |
US11/383,326 Continuation-In-Part US7942904B2 (en) | 2005-05-12 | 2006-05-15 | Pedicle screw based vertebral body stabilization apparatus |
US11/549,675 Continuation-In-Part US7828830B2 (en) | 2005-05-12 | 2006-10-16 | Dynamic spinal stabilization |
Publications (1)
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US20060271048A1 true US20060271048A1 (en) | 2006-11-30 |
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Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US11/128,962 Abandoned US20060271048A1 (en) | 2005-05-12 | 2005-05-12 | Pedicle screw based vertebral body stabilization apparatus |
US11/383,326 Expired - Fee Related US7942904B2 (en) | 2005-05-12 | 2006-05-15 | Pedicle screw based vertebral body stabilization apparatus |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
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US11/383,326 Expired - Fee Related US7942904B2 (en) | 2005-05-12 | 2006-05-15 | Pedicle screw based vertebral body stabilization apparatus |
Country Status (3)
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US (2) | US20060271048A1 (en) |
EP (1) | EP2023836A4 (en) |
WO (1) | WO2007134230A2 (en) |
Cited By (8)
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US20070191846A1 (en) * | 2006-01-31 | 2007-08-16 | Aurelien Bruneau | Expandable spinal rods and methods of use |
US20080177260A1 (en) * | 2007-01-12 | 2008-07-24 | Lanx, Inc. | Bone fastener assembly |
US20080234757A1 (en) * | 2007-02-27 | 2008-09-25 | Jacofsky Marc C | Modular pedicle screw system |
US20080262556A1 (en) * | 2007-02-27 | 2008-10-23 | Jacofsky Marc C | Modular polyaxial pedicle screw system |
US7815663B2 (en) | 2006-01-27 | 2010-10-19 | Warsaw Orthopedic, Inc. | Vertebral rods and methods of use |
US8118840B2 (en) | 2009-02-27 | 2012-02-21 | Warsaw Orthopedic, Inc. | Vertebral rod and related method of manufacture |
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US8118840B2 (en) | 2009-02-27 | 2012-02-21 | Warsaw Orthopedic, Inc. | Vertebral rod and related method of manufacture |
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Also Published As
Publication number | Publication date |
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EP2023836A4 (en) | 2012-04-25 |
WO2007134230A3 (en) | 2008-06-26 |
US7942904B2 (en) | 2011-05-17 |
WO2007134230A2 (en) | 2007-11-22 |
EP2023836A2 (en) | 2009-02-18 |
US20070043360A1 (en) | 2007-02-22 |
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