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-0506365 (2012-04-13) |
등록번호 | US-8444681 (2013-05-21) |
발명자 / 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
|
인용정보 | 피인용 횟수 : 32 인용 특허 : 435 |
A polyaxial bone screw assembly includes a threaded shank body having an integral upper portion receivable in an integral receiver, the receiver having an upper channel for receiving a longitudinal connecting member and a lower cavity cooperating with a lower opening. A down-loadable compression ins
A polyaxial bone screw assembly includes a threaded shank body having an integral upper portion receivable in an integral receiver, the receiver having an upper channel for receiving a longitudinal connecting member and a lower cavity cooperating with a lower opening. A down-loadable compression insert with tool receiving arm extensions, a down-loadable friction fit split retaining ring and an up-loadable shank upper portion cooperate to provide for pop- or snap-on assembly of the shank with the receiver either prior to or after implantation of the shank into a vertebra. The shank and receiver once assembled cannot be disassembled.
1. In a bone anchor, the improvement comprising: a) a shank having a body for fixation to a bone and an integral upper substantially spherical head;b) a receiver having a top portion and a base and an outer surface, the receiver top portion defining an open channel, the base defining a chamber and a
1. In a bone anchor, the improvement comprising: a) a shank having a body for fixation to a bone and an integral upper substantially spherical head;b) a receiver having a top portion and a base and an outer surface, the receiver top portion defining an open channel, the base defining a chamber and a lower opening, the chamber communicating with both the channel and the lower opening, the top portion having a pair of opposed through apertures formed therein;c) at least one insert disposed within the receiver, the insert having a curved surface sized and shaped for frictional mating cooperation with the shank head, the insert further having a pair of outwardly extending arm portions, each arm portion partially extending through one of the apertures of the receiver, the arm portions being engageable by manipulation tools located at the receiver outer surface for movement of the insert both downwardly into contact with the shank head and upwardly away from the shank head; andd) a resilient open retainer having a base, the retainer captured within the chamber and expandable about at least a portion of the shank head and wherein expansion-only locking engagement occurs between the shank upper portion and the retainer base and between the retainer base and the receiver. 2. The improvement of claim 1 wherein a pair of shallow grooves are formed in the outer surface of the receiver, each groove communicating with a respective aperture, each groove extending from the respective aperture to a top surface of the top portion of the receiver, each groove having a width for receiving a manipulation tool. 3. The improvement of claim 1 wherein the insert has an outer surface releasably frictionally locked against the receiver. 4. The improvement of claim 1 wherein the receiver channel is a first channel and the insert has a second channel, the insert being top loaded into the receiver and then rotated into a position above the retainer with the second channel aligned with the first channel. 5. The improvement of claim 4 wherein the insert outwardly extending arm portions are received by an inner cylindrical surface of the receiver top portion during rotation of the insert with respect to the receiver. 6. The improvement of claim 1 wherein the retainer base has at least a first planar surface seated on a second planar surface partially defining the receiver chamber. 7. The improvement of claim 1 wherein the retainer base has a first outer non-tapered surface in engagement with a second surface partially defining the receiver chamber. 8. The improvement of claim 1 wherein the retainer is partially defined by a concave inner partially spherical surface having a radius smaller than a radius of the shank head and wherein at least one of an upper and a lower edge defining the retainer inner partially spherical surface is in frictional engagement with the shank head. 9. The improvement of claim 8 wherein both the upper and lower edges defining the retainer inner partially spherical surface are in temporary frictional engagement with the shank head to provide a frictional but movable engagement between the shank head and the retainer prior to locking of the shank head with respect to the retainer. 10. The improvement of claim 1 wherein the retainer further comprises a pair of opposed outwardly extending resilient tabs and the retainer base has at least a first planar surface and the receiver has a second planar surface partially defining the receiver chamber and a second pair of opposed apertures and wherein after the shank head is received through the retainer base, the retainer base first planar surface is seated on the receiver second surface and the resilient tabs expand to a neutral state and are captured within the second pair of receiver apertures. 11. In a bone anchor, the improvement comprising: a) a shank having a body for fixation to a bone and an integral upper substantially spherical head having a first radius;b) a receiver having a base, a first pair of upright arms and an outer surface, the receiver upright arms defining an open channel, the base defining a chamber and a lower opening, the chamber communicating with both the channel and the lower opening, each arm having a through aperture formed therein;c) at least one insert disposed within the receiver chamber, the insert having a surface sized and shaped for frictional mating cooperation with the shank head, the insert further having a second pair of upright arms, each arm having an outwardly extending wing, each wing extending through one of the apertures of the receiver, the wings being engageable by tooling placed adjacent to the receiver outer surface for movement of the insert both toward and away from the shank head; andd) a resilient open retainer having a base, the retainer captured within the chamber and expandable about at least a portion of the shank head and wherein expansion-only locking engagement occurs between the shank upper portion and the retainer base and between the retainer base and the receiver, the retainer having a concave second substantially spherical surface with a radius smaller than the radius of the shank head, the second surface terminating at upper and lower edges, the edges temporarily frictionally mating with the shank head, providing a friction fit between the retainer and the shank head during non-locking angular manipulation of the shank with respect to the receiver. 12. The improvement of claim 11 wherein a pair of shallow grooves are formed in the outer surface of the receiver, each groove communicating with a respective aperture, each groove extending from the respective aperture to a top surface of the top portion of the receiver, each groove having a width for receiving a manipulation tool. 13. The improvement of claim 11 wherein the insert has an outer surface releasably frictionally locked against the receiver. 14. The improvement of claim 11 wherein the insert is top loaded into the receiver and then rotated into a position above the retainer with the insert second pair of arms aligned with the receiver first pair of arms and the wings located within the receiver apertures. 15. The improvement of claim 11 wherein the retainer base has at least a first planar surface seated on a second planar surface partially defining the receiver chamber. 16. The improvement of claim 11 wherein the retainer base has a first outer non-tapered surface in engagement with a second surface partially defining the receiver chamber. 17. The improvement of claim 11 wherein the retainer further comprises a pair of opposed outwardly extending resilient tabs and the retainer base having at least a first planar surface and the receiver having a second planar surface partially defining the receiver chamber and a second pair of opposed apertures and wherein after the shank head is received through the retainer base, the retainer base first planar surface is seated on the receiver second surface and the resilient tabs expand to a neutral state and are captured within the second pair of receiver apertures. 18. In a bone anchor, the improvement comprising: a) a shank having a body for fixation to a bone and an integral upper portion having a convex substantially spherical first surface with a first radius;b) a receiver having a base and a pair of upright arms forming an open channel, the base defining a chamber and having a lower opening, the channel communicating with the chamber;c) at least one insert disposed within the receiver chamber having structure that directly engages lock and release tools;d) a resilient open retainer captured within the chamber and expandable about at least a portion of the shank upper portion, the retainer having a concave surface with a radius smaller than the radius of the shank upper portion first surface, the retainer concave surface terminating at upper and lower edges, the edges frictionally mating with the shank first spherical surface, providing a friction fit between the retainer and the shank during non-locking angular manipulation of the shank with respect to the receiver; ande) wherein expansion-only locking engagement occurs between the shank upper portion and the retainer and between the retainer and the receiver. 19. The improvement of claim 18 wherein the receiver pair of upright arms is a first pair of upright arms, and the insert comprises a body and a second pair of upright arms, each insert arm having an outwardly extending wing, each wing extending through an aperture of the receiver, the wings being engageable by tooling placed adjacent to an outer surface of the receiver for movement of the insert both toward and away from the shank upper portion. 20. The improvement of claim 19 wherein a pair of shallow grooves are formed in the outer surface of the receiver, each groove communicating with a respective receiver aperture, each groove extending from the respective aperture to a top surface of the receiver, each groove having a width for receiving a manipulation tool. 21. The improvement of claim 18 wherein the retainer further comprises a pair of opposed outwardly extending resilient tabs and the retainer having a base with at least a first planar surface and the receiver having a second planar surface partially defining the receiver chamber and a second pair of opposed apertures and wherein after the shank upper portion is received through the retainer base, the retainer base first planar surface is seated on the receiver second surface and the resilient tabs expand to a neutral state and are captured within the second pair of receiver apertures.
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