최소 단어 이상 선택하여야 합니다.
최대 10 단어까지만 선택 가능합니다.
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
DataON 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Edison 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0507822 (2012-07-31) |
등록번호 | US-9414863 (2016-08-16) |
발명자 / 주소 |
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출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 | 피인용 횟수 : 2 인용 특허 : 413 |
A polyaxial bone screw assembly includes a receiver, a shank, an articulation structure for retaining the shank in the receiver and a compression insert for engagement with a longitudinal connecting member such as a rod. The articulation structure includes substantially spherical convex and concave
A polyaxial bone screw assembly includes a receiver, a shank, an articulation structure for retaining the shank in the receiver and a compression insert for engagement with a longitudinal connecting member such as a rod. The articulation structure includes substantially spherical convex and concave surfaces that slidably engage both shank and receiver surfaces to provide compound articulation between the receiver and the shank. The receiver includes inwardly directed spring tabs engaging the insert and prohibiting rotation of the insert within the receiver.
1. A polyaxial bone screw assembly comprising: a) a bone screw shank having an upper portion;b) a receiver having a cavity, the bone screw upper portion being receivable in the cavity;c) a retaining and articulating structure receivable in the cavity between the shank upper portion and the receiver,
1. A polyaxial bone screw assembly comprising: a) a bone screw shank having an upper portion;b) a receiver having a cavity, the bone screw upper portion being receivable in the cavity;c) a retaining and articulating structure receivable in the cavity between the shank upper portion and the receiver, the retaining and articulating structure being unattached to both the shank and the receiver so as to be freely movable relative to both the shank and the receiver during positioning of the shank relative to the receiver;d) a compression insert disposed in the receiver during final positioning of the shank to lock the shank in place, the insert having a depression formed in an outer surface thereof and having a mating surface exclusively frictionally engageable with the bone screw upper portion, wherein the insert is spaced from the retaining and articulating structure; ande) resilient structure extending from the receiver and biasing against the compression insert at the depression thereof, the resilient structure resisting rotational movement of the compression insert within the receiver to maintain a desired alignment of the insert with the receiver, while allowing for upward and downward movement of the insert with respect to the receiver. 2. The assembly of claim 1 wherein the compression insert mating surface is concave and the bone screw upper portion is convex. 3. The assembly of claim 1 wherein the shank upper portion has a convex surface and the retaining and articulating structure has a concave surface in slidable mating engagement with the convex surface. 4. The assembly of claim 3 wherein the concave and convex surfaces are substantially spherical. 5. The assembly of claim 1 wherein the retaining and articulating structure has a convex surface and the receiver has a concave surface in slidable mating engagement with the convex surface. 6. The assembly of claim 5 wherein the concave and convex surfaces are substantially spherical. 7. The assembly of claim 1 wherein the shank upper portion has a tool engagement formation formed thereon adapted for non-slip engagement by a tool for driving the bone screw shank into bone. 8. The assembly of claim 7 wherein the tool engagement formation is a substantially hex shaped inner drive. 9. The assembly of claim 1 wherein the retaining and articulating structure is sized and shaped to be at least one of top-loadable and bottom-loadable into the receiver. 10. The assembly of claim 1 wherein the retaining and articulating structure further comprises first and second spaced ends, the retaining and articulating structure being compressible and expandible with the first and second ends being movable toward and away from one another. 11. The assembly of claim 10 wherein the retaining and articulating structure has a central axis, the first and second ends each being substantially planar surfaces running substantially parallel to the axis. 12. The assembly of claim 10 wherein the retaining and articulating structure has a central axis, the first and second ends each being substantially planar surfaces running at an angle oblique to the axis. 13. The assembly of claim 1 wherein the bone screw shank is cannulated. 14. The assembly of claim 1 wherein a) the bone screw shank has a body for fixation to bone, the shank body being integral with the shank upper portion; andb) the assembly further comprising a closure structure insertable into the receiver, the closure structure for operably urging the insert into frictional engagement with the bone screw shank upper portion and moving the shank in a direction to frictionally lock the position of the retaining and articulating structure with respect to the shank upper portion and the receiver, thereby locking the shank body in a selected angle with respect to the receiver. 15. The assembly of claim 14 wherein: (a) the receiver has upstanding spaced arms defining an open channel, the arms having guide and advancement structures on an inside surface thereof; and(b) the closure structure is sized and shaped to be positionable between the arms for closing the channel, the closure structure having a closure guide and advancement structure for rotatably mating with the guide and advancement structures on the arms, biasing the closure structure upon advancement rotation against a longitudinal connecting member disposed in the channel. 16. The assembly of claim 1 wherein the resilient structure is a pair of opposed spring tabs attached to the receiver and extending toward a central axis of the receiver. 17. The assembly of claim 16 wherein the spring tabs are integral with the receiver. 18. The assembly of claim 16 wherein the spring tabs are directed upwardly toward a top opening of the receiver. 19. The assembly of claim 16 wherein the spring tabs are directed downwardly toward a base of the receiver. 20. The assembly of claim 1 wherein the insert depression is a shallow groove. 21. The assembly of claim 1 wherein the insert depression is a flat surface. 22. The assembly of claim 1 wherein the insert is one of top and bottom loaded. 23. In a polyaxial bone screw assembly for surgical implantation and including a shank and a threaded body for inserting into a bone and a receiver having a channel for receiving a longitudinal connecting member within the channel, the improvement wherein: a) the shank has a first curvate surface at an upper end thereof and is pivotally engaged with an interior surface of the receiver; and further comprising:b) an articulation structure located between the shank upper end and the receiver, the articulation structure having a second curvate surface and an opposed third curvate surface, the articulation structure being in slidable engagement with receiver at the second curvate surface, the articulation structure third curvate surface being in slidable engagement with the shank upper end first curvate surface, the articulation structure being freely movable relative to both the shank and the receiver during positioning of the shank relative to the receiver;c) a compression insert having a fourth curvate surface in slidable engagement with the shank first curvate surface, the insert being spaced from the articulating structure, and the insert having a depression formed in an outer surface thereof; andd) resilient structure extending from the receiver and biasing against the compression insert at the depression thereof, the resilient structure resisting rotational movement of the compression insert within the receiver to maintain a desired alignment of the insert with the receiver, while allowing for upward and downward movement of the insert with respect to the receiver. 24. The improvement of claim 23 wherein the shank upper end has a tool engagement formation formed thereon adapted for non-slip engagement by a tool for driving the bone screw shank into bone. 25. The improvement of claim 23 wherein the articulation structure is sized and shaped to be at least one of top-loadable and bottom-loadable into the receiver. 26. The improvement of claim 23 wherein the articulation structure further comprises first and second spaced ends, the articulation structure being compressible and expandible with the first and second ends being movable toward and away from one another. 27. The improvement of claim 23 wherein the resilient structure is a pair of opposed spring tabs integral with the receiver and extending toward a central axis of the receiver. 28. The improvement of claim 27 wherein the opposed spring tabs face downwardly. 29. The improvement of claim 27 wherein the opposed spring tabs face upwardly. 30. In a bone screw assembly having a receiver pivotally connected to a bone screw shank, the receiver having an opening for receiving a longitudinal connecting member and a compression insert disposed in the receiver for frictional engagement with the longitudinal connection member and having a depression formed in an outer surface thereof, the improvement comprising: a) resilient structure extending from the receiver and biasing against the compression insert at the depression thereof, the resilient structure resisting rotational movement of the compression insert within the receiver to maintain a desired alignment of the insert with the receiver, while allowing for upward and downward movement of the insert with respect to the receiver; andb) an articulation structure disposed between the bone screw shank and the receiver, the articulation structure having a first curvate wall in sliding engagement with the receiver and a second curvate wall in sliding engagement with the bone screw shank. 31. The improvement of claim 30 wherein the resilient structure is a pair of opposed spring tabs attached to the receiver and extending toward a central axis of the receiver. 32. The improvement of claim 31 wherein the opposed spring tabs face downwardly. 33. The improvement of claim 31 wherein the opposed spring tabs face upwardly. 34. The improvement of claim 30 wherein the insert depression is a shallow groove. 35. The improvement of claim 30 wherein the insert depression is a flat surface. 36. The improvement of claim 30 wherein the articulation structure further comprises first and second spaced ends, the articulation structure being compressible and expandible with the first and second ends being movable toward and away from one another. 37. The improvement of claim 30 wherein the articulation structure is freely movable relative to both the shank and the receiver during positioning of the shank relative to the receiver. 38. In a bone screw assembly having a receiver pivotally connected to a bone screw shank, the shank having a lower portion attachable to a bone and an upper head portion, the receiver having an opening for receiving a longitudinal connecting member, the assembly also having a compression insert disposed in the receiver for frictional engagement with the longitudinal connecting member and the shank upper head portion, the improvement wherein the receiver comprises: a resilient structure integral with the receiver, the structure having a surface projecting inwardly and facing downwardly into the receiver in a direction towards the shank; the structure biasing against the compression insert, holding the insert within the receiver and downwardly against the shank upper head portion, and resisting rotational movement of the insert to maintain a desired alignment of the insert with the receiver, while allowing for upward and downward movement of the insert with respect to the receiver. 39. The improvement of claim 38 wherein the resilient structure is a first resilient structure; and further comprising a second resilient structure integral with the receiver and located opposite the first resilient structure, the second resilient structure also projecting inwardly and facing downwardly into the receiver in a direction towards the shank. 40. In a bone screw assembly having a receiver pivotally connected to a bone screw shank, the shank having a lower portion attachable to a bone and an upper head portion, the receiver having an opening for receiving a longitudinal connecting member, the assembly also having a compression insert disposed in the receiver for frictional engagement with the longitudinal connecting member and the shank upper head portion, the improvement wherein the receiver comprises: a resilient structure integral with the receiver, the structure having a surface projecting inwardly and facing upwardly into the receiver in a direction towards the shank; the structure biasing against the compression insert, holding the insert within the receiver and downwardly against the shank upper head portion, and resisting rotational movement of the insert to maintain a desired alignment of the insert with the receiver, while allowing for upward and downward movement of the insert with respect to the receiver. 41. The improvement of claim 40, wherein the resilient structure is a first resilient structure; and further comprising a second resilient structure integral with the receiver and located opposite the first resilient structure, the second resilient structure also projecting inwardly and facing upwardly into the receiver in a direction towards the shank. 42. In a bone screw assembly having a receiver pivotally connected to a bone screw shank, the receiver having an opening for receiving a longitudinal connecting member and a compression insert disposed in the receiver for frictional engagement with the longitudinal connection member, the improvement comprising: a) resilient structure extending from the receiver and biasing against the compression insert at a depression formed in a surface of the insert, the resilient structure resisting rotational movement of the compression insert within the receiver to maintain a desired alignment of the insert with the receiver, while allowing for upward and downward movement of the insert with respect to the receiver; andb) an articulation structure disposed between the bone screw shank and the receiver, the articulation structure having a first curvate wall in sliding engagement with the receiver and a second curvate wall in sliding engagement with the bone screw shank; andc) the compression insert comprising a top and bottom portion having a bottom surface and a through-bore with an opening on the bottom surface sized and shaped to mate with an upper portion of the bone screw shank. 43. The improvement of claim 42, wherein the top portion of the through-bore is cylindrical shaped, and the bottom portion of the through-bore is sized and shaped to mate with the upper portion of the bone screw shank. 44. A polyaxial bone screw assembly comprising: a) a bone screw shank having an upper portion with a top surface;b) a receiver having an internal cavity with an integral spherical seating surface adjacent a lower opening, the bone screw upper portion receivable in the cavity through the opening;c) a retaining and articulating structure receivable in the cavity and positioned below the top surface of the shank and between the shank upper portion and the receiver, the retaining and articulating structure having an outer spherical surface for seating against the receiver seating surface and being unattached to both the shank and the receiver so as to be freely movable relative to both the shank and the receiver during positioning of the shank relative to the receiver;d) a compression insert disposed in the receiver during final positioning of the shank to lock the shank in place, the insert having a lower first mating surface frictionally engageable with the bone screw upper portion and an upper second mating surface to engage a rod; ande) resilient structure extending from the receiver and biasing against the compression insert at a depression formed in a surface of the insert, the resilient structure resisting rotational movement of the compression insert within the receiver to maintain a desired alignment of the insert with the receiver, while allowing for upward and downward movement of the insert with respect to the receiver.
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