IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
|
| 국제특허분류(IPC7판) |
|
| 출원번호 |
US-0920340
(2009-03-05)
|
| 등록번호 |
US-8696708
(2014-04-15)
|
| 국제출원번호 |
PCT/US2009/036175
(2009-03-05)
|
| §371/§102 date |
20100831
(20100831)
|
| 국제공개번호 |
WO2009/111632
(2009-09-11)
|
|
발명자
/ 주소 |
- Lechmann, Beat
- Pavlov, Paul W.
- Zurschmiede, Silas
|
| 출원인 / 주소 |
- DePuy Synthes Products, LLC
|
| 대리인 / 주소 |
|
| 인용정보 |
피인용 횟수 :
1 인용 특허 :
80 |
초록
▼
A facet interference screw (10) for insertion between the facet joints of adjacent superior and inferior vertebrae includes an externally threaded shaft portion and a head. The facet interference screw is preferably split into first (20) and second (30) components, each including an outer, semicircu
A facet interference screw (10) for insertion between the facet joints of adjacent superior and inferior vertebrae includes an externally threaded shaft portion and a head. The facet interference screw is preferably split into first (20) and second (30) components, each including an outer, semicircular externally threaded surface (22, 32) so that when coupled together the semicircular externally threaded surfaces form the externally threaded shaft portion. The inner surfaces (24, 34) of the first and second components may include curved contacting surfaces so that when inserted, the first component is movable with respect to the second component. Alternatively, the screw may include a damping component (60a′) between the inner surfaces of the first and second components to facilitate damping of the first and second components with respect to one another. The damping component preferably also facilitates articulated motion of the first and second components.
대표청구항
▼
1. A facet interference screw for insertion into a facet joint between an inferior facet of a superior vertebra and a superior facet of an inferior vertebra, the facet interference screw being elongate along a central longitudinal axis, the facet interference screw comprising: a first component incl
1. A facet interference screw for insertion into a facet joint between an inferior facet of a superior vertebra and a superior facet of an inferior vertebra, the facet interference screw being elongate along a central longitudinal axis, the facet interference screw comprising: a first component including a first outer semicircular surface and a first inner surface, the first outer semicircular surface intersecting with the first inner surface to define a first edge and a second edge that is spaced from the first edge in a direction direction perpendicular to the central longitudinal axis; anda second component including a second outer semicircular surface and a second inner surface, the second outer semicircular surface intersecting with the second inner surface to define a third edge and a fourth edge that is spaced from the third edge in a second direction perpendicular to the central longitudinal axis, the first and second components, when assembled with each other, define a head, a tip spaced from the head along the central longitudinal axis, and an externally threaded shaft portion extending between the head and the tip, the externally threaded shaft portion including a first thread extending uninterrupted from the first edge to the second edge along the first outer semicircular surface, the externally threaded shaft portion further including a second thread extending uninterrupted from the third edge to the fourth edge along the second outer semicircular surface, wherein when the first and second components are assembled with each other the first and second threads align to facilitate rotational implantation into the facet joint;an upper inner component having a respective outer surface configured to at least partially abut the first inner surface of the first component and a first contact surface that extends from a first location near the head to a second location near the tip; anda lower inner component having a respective outer surface configured to at least partially abut the second inner surface of the second component and a second contact surface that extends from a third location near the head to a fourth location near the tip, the second contact surface configured to engage with the first contact surface such that the upper inner component is articulable with respect to the lower inner component. 2. The facet interference screw of claim 1, wherein a respective first one of the first or second contacting surfaces is convex and a respective second one of the first or second contacting surfaces is concave. 3. The facet interference screw of claim 2, wherein a respective radius of curvature of the convex surface is substantially equal to a respective radius of curvature of the concave surface. 4. The facet interference screw of claim 1, wherein the first and second inner surfaces are generally parallel. 5. The facet interference screw of claim 1, wherein the first and second inner surfaces are curved. 6. The facet interference screw of claim 1, wherein at least one of the first and second inner surfaces includes a guiding mechanism. 7. The facet interference screw of claim 1, wherein at least a portion of the first contacting surface is substantially spherical and at least a portion of the second contacting surface is substantially spherical. 8. The facet interference screw of claim 1, wherein the head includes an indicator that is aligned with an articulation plane defined by the facet interference screw. 9. The facet interference screw of claim 1, wherein the respective outer surface of the upper inner component is bonded to the first inner surface and the respective outer surface of the lower inner component is bonded to the second inner surface. 10. The facet interference screw of claim 1, wherein the upper and lower inner components define a cannulation that extends through the facet interference screw along the central longitudinal axis. 11. The facet interference screw of claim 1, wherein the first and third locations are disposed substantially at the head and the second and fourth locations are disposed substantially at the tip. 12. The facet interference screw of claim 1, wherein the first and third locations are substantially coincident with one another and the second and fourth locations are substantially coincident with one another. 13. The facet interference screw of claim 1, wherein the externally threaded shaft portion is substantially circular in shape. 14. The facet interference screw of claim 1, wherein the tip defines a first maximum outer dimension, the externally threaded shaft portion defines a second maximum outer dimension that is greater than the first maximum outer dimension, and the head defines a third maximum outer dimension that is greater than the second maximum outer dimension, each of the first, second, and third maximum outer dimensions being measured in a direction perpendicular to the central longitudinal axis. 15. The facet interference screw of claim 1, wherein the first direction perpendicular to the central longitudinal axis and the second direction perpendicular to the central longitudinal axis are the same direction. 16. A method comprising the steps of: providing a facet interference screw including a first component having a first externally threaded surface and a first inner surface and a second component having a second externally threaded surface and a second inner surface, the first and second components defining a tip and a head of the facet interference screw;inserting a spacer between the first and second inner surfaces of the first and second components of the facet interference screw, the spacer defining a cannula that extends through the spacer;inserting a guide wire at least partially into a facet joint between a first vertebra and a second vertebra that is adjacent the first vertebra;disposing the cannula over the guide wire and guiding the facet interference screw along the guide wire such that the tip of the facet interference screw is positioned adjacent the facet joint;driving the facet interference screw into the facet joint until the head contacts at least one of the first or second vertebrae; andremoving the guide wire from the facet joint such that the guide wire engages the cannula and causes the spacer to be withdrawn from between the first and second inner surfaces of the first and second components. 17. The method of claim 16, further comprising the steps of: providing a second facet interference screw including a first component having a first externally threaded surface and a first inner surface and a second component having a second externally threaded surface and a second inner surface, the first and second components defining a tip and a head of the second facet interference screw;inserting a second spacer between the first and second inner surfaces of the first and second components of the second facet interference screw, the spacer defining a cannula that extends through the spacer;inserting a guide wire at least partially into a second facet joint between the first vertebra second vertebrae;disposing the cannula of the second spacer over the second guide wire and guiding the second facet interference screw along the second guide wire such that the tip of the second facet interference screw is positioned adjacent the second facet joint;driving the second facet interference screw into the second facet joint until the head contacts at least one of the first or second vertebrae; andremoving the second guide wire from the second facet joint such that the guide wire engages the cannula of the second spacer and causes the second spacer to be withdrawn from between the first and second inner surfaces of the first and second components of the second facet interference screw. 18. The method of claim 17, further comprising the step of: prior to removing the guide wire and the second guide wire, inserting a first damping component between the first and second inner surfaces of the first and second components of the facet interference screw and inserting a second damping component between the first and second inner surfaces of the first and second components of the second facet interference screw. 19. The method of claim 18, wherein the each of the first and second damping components comprises an upper inner component having a first contact surface and a lower inner component having a second contact surface configured to abut the first contact surface such that the upper and lower inner components are articulable with respect to each other along the first and second contact surfaces. 20. The method of claim 17, wherein the facet interference screw and the second facet interference screw are driven into the facet joint and the second facet joint, respectively, substantially simultaneously. 21. The method of claim 17, wherein the method further comprises the step of: prior to guiding the facet interference screw along the guide wire and guiding the second facet interference screw along the second guide wire, verifying that a position of the guide wire in the facet joint is substantially symmetrical with respect to a respective position of the second guide wire in the second facet joint. 22. The method of claim 16, further comprising the step of: prior to removing the guide wire, inserting a damping component between the first and second inner surfaces of the first and second components. 23. The method of claim 16, wherein the head includes an indicator that represents an articulation plane of the facet interference screw, the method further comprising the step of: aligning the indicator with a facet joint plane of the facet joint.
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