IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
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출원번호 |
US-0584981
(2009-09-15)
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등록번호 |
US-8092500
(2012-01-10)
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발명자
/ 주소 |
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출원인 / 주소 |
|
대리인 / 주소 |
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인용정보 |
피인용 횟수 :
4 인용 특허 :
292 |
초록
▼
A dynamic fixation medical implant having at least two bone anchors includes a dynamic longitudinal connecting member assembly having the following features: a pair of elongate bone anchor engagement segments, a floating inner core disposed in apertures of both anchor segments, at least one compress
A dynamic fixation medical implant having at least two bone anchors includes a dynamic longitudinal connecting member assembly having the following features: a pair of elongate bone anchor engagement segments, a floating inner core disposed in apertures of both anchor segments, at least one compression spacer surrounding the core and located between the anchor segments and in some embodiments an over-mold surrounding the compression spacer and at least a portion of one of the anchor segments. The implant may further include a tubed sleeve surrounding the core and located between the anchor segments.
대표청구항
▼
1. In a medical implant assembly having at least two bone anchors cooperating with a longitudinal connecting member, the improvement wherein the longitudinal connecting member comprises: a) first and second segments, the first segment having a first bore formed in a first end surface thereof, the se
1. In a medical implant assembly having at least two bone anchors cooperating with a longitudinal connecting member, the improvement wherein the longitudinal connecting member comprises: a) first and second segments, the first segment having a first bore formed in a first end surface thereof, the second segment having a second bore formed in a second end surface thereof, the first segment attached to the first bone anchor and the second segment attached to the second bone anchor;b) an inner elongate core partially disposed and slidingly received within each of the bores of the first and second segments;c) at least one spacer member disposed about the core and located between the first and second segments; andd) an elastic structure surrounding the at least one spacer member, the elastic structure gripping at least the first segment, the spacer member being slidable along the inner core with the elastic structure being in a stretched orientation when one of the first and second segments moves away from the other of the first and second segments. 2. The improvement of claim 1 wherein the elastic structure grips both the first and second segments. 3. The improvement of claim 1 wherein the first segment has a first end plate and the elastic structure is molded about the first end plate. 4. The improvement of claim 1 wherein the spacer member is a first compression spacer and further comprising: a) a second elastic compression spacer disposed about the core and located between the first and second segments; andb) an inelastic slidable tube, the tube slidably receiving the core, the tube engaging both the first and second compression spacers, the tube attached to a third bone anchor. 5. The improvement of claim 1 wherein the spacer member has opposed parallel end surfaces. 6. The improvement of claim 1 wherein the spacer member has opposed non-parallel load-bearing end surfaces. 7. The improvement of claim 1 wherein the spacer member has a curved load bearing surface. 8. The improvement of claim 1 wherein the first end surface is concave and the spacer member has a convex abutment surface slidably cooperating with the first end surface. 9. The improvement of claim 1 wherein the first end surface is convex and the spacer member as a concave abutment surface slidably cooperating with the first end surface. 10. The improvement of claim 1 wherein the first end surface is planar. 11. The improvement of claim 1 wherein the elastic structure is molded over the at least one spacer member. 12. The improvement of claim 1 wherein the elastic structure is made from a composite material comprising elongate reinforcement strands imbedded in a polymer. 13. The improvement of claim 1 wherein the core is made from a polymer. 14. The improvement of claim 13 wherein the polymer is polyetheretherketone. 15. In a medical implant assembly having at least three bone anchors cooperating with a longitudinal connecting member, the improvement wherein the longitudinal connecting member comprises: a) a first inelastic anchor member having a non-integral inner core slidably connected thereto, the inner core being elongate and extending along a substantially central axis of the longitudinal connecting member, the first anchor member being in engagement with at least one of the bone anchors;b) at least two elastic compressible spacers, the core being slidingly received in the spacers;c) at least one inelastic sleeve located between the spacers, the core being slidingly received within the sleeve, the sleeve being in engagement with at least one of the bone anchors;d) a second inelastic anchor member having an aperture for slidingly receiving the inner core; ande) first and second elastic over-molds, the first over-mold surrounding the first spacer and the second over-mold surrounding the second spacer, the first over-mold attaching the first anchor member to the sleeve, the second over-mold attaching the second anchor member to the sleeve. 16. The improvement of claim 15 wherein the at least one sleeve has an inner surface defining a through bore, the core being received in the through bore and in sliding relation with the sleeve inner surface, the sleeve inner surface being non-linear in cross-section taken along the central axis, the surface flaring radially outwardly towards at least one of the first and second spacers. 17. The improvement of claim 16 wherein the sleeve inner surface is hyperboloid. 18. In a medical implant assembly having at least two bone anchors cooperating with a longitudinal connecting member, the improvement wherein the longitudinal connecting member comprises: a) an anchor member having an inner aperture slidingly receiving a discrete inner core, the core extending from the anchor member along a central axis of the connecting member, the core being surrounded by a remainder of the connecting member and in one of spaced and slidable relation thereto;b) at least one elastic spacer, the core being slidingly received in the spacer along the axis, the spacer being positioned between the at least two bone anchors;c) at least one inelastic sleeve, the core being slidingly received within the sleeve along the axis, the sleeve being in engagement with at least one of the bone anchors; andd) an over-molded elastomer surrounding the spacer and attached to the anchor member and the sleeve. 19. The improvement of claim 18 wherein the elastic spacer is in compression and the over-molded elastomer is in tension prior to implantation. 20. The improvement of claim 18 wherein the over-molded elastomer further comprises reinforcement strands. 21. The improvement of claim 20 wherein the reinforcement strands are sinusoidal. 22. In a medical implant assembly having at least two bone attachment structures cooperating with a longitudinal connecting member, the improvement wherein the longitudinal connecting member comprises: a) an anchor member having a first width and an aperture;b) a discrete core having a second smaller width, the core slidingly received in the aperture and freely movable along a central axis of the connecting member, the first and second widths measured in a direction perpendicular to the axis;c) at least one elastic outer spacer, the core being slidingly received in the spacer along the axis, the spacer being positioned between the at least two bone attachment structures;d) at least one inelastic sleeve, the core being slidingly received within the sleeve along the axis, the sleeve being in engagement with at least one of the bone attachment structures, the sleeve having an inner surface defining a through bore for receiving the core, at least a portion of the inner surface being non-linear in a cross-section taken along the axis; ande) at least one over-molded elastomeric covering, the covering in contact with the anchor member, the spacer and the sleeve. 23. The improvement of claim 22 wherein the sleeve inner surface flares radially outwardly in a direction toward the at least one compressible outer spacer. 24. The improvement of claim 22 wherein the sleeve inner surface is hyperboloid in shape. 25. The improvement of claim 22 wherein the spacer is pre-compressed. 26. The improvement of claim 22 wherein the covering further comprises elongate reinforcement strands imbedded in a polymer. 27. In a medical implant assembly having at least two bone anchors cooperating with a longitudinal connecting member, the improvement wherein the longitudinal connecting member comprises: a) an anchor member having a closed ended central inner aperture slidingly receiving and encircling a discrete inelastic inner core, the core extending from the anchor member along a central axis of the connecting member, the core being surrounded by a remainder of the connecting member and in one of spaced and slidable relation thereto;b) at least one spacer having a spacer bore, the core being slidingly received in the spacer bore along the axis, the spacer being positioned between the at least two bone anchors; andc) at least one inelastic sleeve trolley tube having a central trolley tube bore, the core being slidingly received within the trolley tube bore along the axis, the trolley tube being in engagement with at least one of the bone anchors. 28. In a medical implant assembly having at least two bone attachment structures cooperating with a longitudinal connecting member, the improvement wherein the longitudinal connecting member comprises: a) an anchor member having a first width and a closed ended inner central aperture;b) a discrete inelastic core having a second smaller width, the core slidingly being received in and fully encircled by the anchor member aperture and freely movable along a central axis of the connecting member, the first and second widths measured in a direction perpendicular to the axis;c) at least one outer spacer having a spacer bore, the core being slidingly received in the spacer bore along the axis, the spacer being positioned between the at least two bone anchors; andd) at least one inelastic tube trolley having a central tube bore, the core being slidingly received within the tube bore along the axis, the tube being in engagement with at least one of the bone attachment structures, the sleeve having an inner surface defining a through bore for receiving the core, at least a portion of the tube inner surface being non-linear in a cross-section taken along the axis.
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