IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0009130
(2008-01-16)
|
등록번호 |
US-8257398
(2012-09-04)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
6 인용 특허 :
210 |
초록
▼
A polyaxial bone screw assembly includes a threaded shank body having an upper portion with a laterally extending lug and a retainer having an inner cam track for receiving the lug and thus attaching the shank upper portion to the retainer within a receiver. The retainer may be a closed or open ring
A polyaxial bone screw assembly includes a threaded shank body having an upper portion with a laterally extending lug and a retainer having an inner cam track for receiving the lug and thus attaching the shank upper portion to the retainer within a receiver. The retainer may be a closed or open ring. The receiver has a cavity and a U-shaped cradle defining a channel for receiving a longitudinal connecting member such as a spinal fixation rod. The retainer has an external surface that mates with an internal surface of the receiver, providing a ball joint.
대표청구항
▼
1. A polyaxial bone screw assembly comprising: (a) a shank having a body for fixation to a bone and an upper portion, the upper portion having at least one laterally extending lug, the lug being spaced from a top surface of the upper portion;(b) a receiver defining an open channel and having a base
1. A polyaxial bone screw assembly comprising: (a) a shank having a body for fixation to a bone and an upper portion, the upper portion having at least one laterally extending lug, the lug being spaced from a top surface of the upper portion;(b) a receiver defining an open channel and having a base with a receiver seating surface partially defining a cavity, the open channel communicating with the cavity, the cavity communicating with an exterior of the base through an opening sized and shaped to receive the shank upper portion therethrough; and(c) a retainer having an internal surface defining a central bore, the internal surface also defining a sloping cam track, the track receiving the lug and frictionally engaging the lug. 2. The assembly of claim 1 wherein the retainer is a continuous closed ring. 3. The assembly of claim 2 wherein the upper portion has a shank seating surface frictionally engaged with the retainer, the at least one lug located between the shank seating surface and the top surface of the upper portion. 4. The assembly of claim 2 wherein the retainer is loaded into the receiver through the open channel for assembly with the shank upper portion in the cavity. 5. The assembly of claim 1 wherein the retainer is open and discontinuous. 6. The assembly of claim 5 wherein the upper portion has a shank seating surface frictionally engaged with the retainer, the shank seating surface being located between the at least one lug and the top surface of the upper portion. 7. The assembly of claim 5 wherein the retainer is loaded into the receiver in a compressed state through the receiver base opening. 8. The assembly of claim 5 wherein the retainer further includes grooves and is expandable and compressible. 9. In a polyaxial bone screw assembly for surgical implantation and including a shank having an upper end and a threaded body for inserting into a bone and a receiver having an outward opening channel adapted to receive a longitudinal connecting member within the channel, the receiver having a shank receiving opening, the improvement comprising: (a) a lug projecting laterally from the shank, the lug spaced from the upper end; and(b) a closed retainer having a top, a bottom, an external surface and an internal surface, both the external and internal surfaces running between the top and the bottom surfaces, the internal surface having a slot with at least one cam surface disposed at an angle with respect to the top and bottom surfaces, the external surface being in slidable relation with the receiver, the cam surface frictionally engaging the lug. 10. In a polyaxial bone screw assembly for surgical implantation and including a shank having an upper end and a threaded body for inserting into a bone and a receiver having an outward opening channel adapted to receive a longitudinal connecting member within the channel, the receiver having a shank receiving opening, the improvement comprising: (a) a lug projecting laterally from the shank, the lug spaced from the upper end;(b) a shank seating surface extending radially from the shank, the shank seating surface being spaced from the upper end and located between the upper end and the lug; and(c) an open retainer having a top, a bottom, an external surface and an internal surface, both the external and internal surfaces running between the top and the bottom surfaces, the internal surface having a cam track formed therein, the track running at an angle with respect to the top and bottom surfaces, the external surface being in slidable relation with the receiver, the cam track frictionally engaging the lug and the shank seating surface frictionally engaging the retainer top. 11. A polyaxial bone screw assembly comprising: (a) a shank having a body for fixation to a bone and an upper portion with a top surface, the upper portion having a shank structure configured to mate with a retainer;(b) a receiver defining an open channel and having a base with a receiver seating surface partially defining a cavity, the open channel communicating with the cavity, the cavity communicating with an exterior of the base through an opening sized and shaped to receive the shank upper portion therethrough; and(c) the retainer having an external partial spherical surface for engaging the receiver seating surface and a retainer structure configured to engage the shank structure, the shank and retainer cooperating in such a manner that a partial rotation between the retainer and the shank brings the shank and retainer structures into locking engagement. 12. The assembly of claim 11 wherein the retainer is a continuous closed ring. 13. The assembly of claim 12 wherein: (a) the upper portion has a shank seating surface frictionally engaged with the retainer; and(b) the shank structure includes at least one lug located between the shank seating surface and the top surface of the upper portion. 14. The assembly of claim 12 wherein the retainer is loaded into the receiver through the open channel for assembly with the shank upper portion in the cavity. 15. The assembly of claim 11 wherein the retainer is open and discontinuous. 16. The assembly of claim 15 wherein: (a) the upper portion has a shank seating surface frictionally engaged with the retainer and the shank structure includes at least one lug; and(b) the shank seating surface is located between the at least one lug and the top surface of the upper portion. 17. The assembly of claim 15 wherein the retainer is loaded into the receiver in a compressed state through the receiver base opening. 18. The assembly of claim 15 wherein the retainer further includes grooves and is expandable and compressible. 19. The assembly of claim 11 wherein: (a) the shank structure includes a lug projecting from the upper portion of the shank; and(b) the retainer structure includes a cam surface formed within the retainer and engaged by the lug. 20. The assembly of claim 11 wherein: (a) the upper portion includes a shank partial spherical surface engageable with the receiver seating surface when the shank structure is mated with the retainer; and(b) the shank spherical surface is located at least partially axial below the retainer spherical surface when the shank structure is mated to the retainer. 21. The assembly of claim 11 wherein the retainer has a spaced apart opposed structure for engaging the shank. 22. A polyaxial bone screw assembly comprising: (a) a shank having a body for fixation to a bone and an upper portion, the upper portion that is received in the receiver and that has at least one shank projecting structure for mating with a retainer;(b) a receiver defining an open channel and having a base with a receiver seating surface partially defining a cavity, the open channel communicating with the cavity, the cavity communicating with an exterior of the base through an opening sized and shaped to receive the shank upper portion therethrough; and(c) the retainer having an external partial spherical surface for engaging the seating surface and a curved ramp structure for receiving and cam engaging the shank projecting structure, wherein a partial rotation between the retainer and the shank brings the structures into locking engagement. 23. A medical implant comprising: a) a receiver having a lower portion with a lower opening and an upper portion with a rod receiving channel;b) a bone screw shank having an upper portion that is received in the receiver and includes a top surface and a cam surface follower;c) a retaining member having a cam surface for a caming engagement with the shank upper portion cam surface follower; and whereind) when the shank is positioned in the receiver, the top surface receives a downward pressure to lock the shank with respect to the receiver. 24. A polyaxial bone screw assembly comprising: a) a shank having a body for fixation to a bone and an upper portion, the upper portion having at least one cam following structure for mating with a retainer;b) a receiver having an open channel and having a base with a seating surface partially defining a cavity, the open channel communicating with the cavity, the cavity communicating with an exterior of the base through an opening sized and shaped to receive the shank upper portion therethrough; andc) the retainer having an external partial spherical surface for engaging the seating surface and a retainer cam track structure for engaging the shank cam follower, wherein a partial rotation between the retainer and shank brings the shank cam follower and retainer cam track structures into locking engagement.
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