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1. (WO2012064360) POLYAXIAL BONE ANCHORS WITH POP-ON SHANK, FRICTION FIT FULLY RESTRAINED RETAINER, INSERT AND TOOL RECEIVING FEATURES
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C L A I M S

What is claimed and desired to be secured by Letters

Patent is as follows:

1. In a polyaxial bone anchor, the improvement

comprising :

a) a receiver having a body defining a chamber, the body being integral with a pair of opposed arms defining a channel, the channel communicating with the chamber, the channel sized and shaped for receiving a portion of a longitudinal connecting member, the chamber communicating with a lower opening, each arm having a first tool

receiving aperture extending through the arm;

b) a shank having a body and an upper curved portion having a hemisphere, the shank body extending through the receiver lower opening;

c) a resilient open retainer located in the chamber, the retainer having a base and a super structure, the base expandable in the chamber about the shank upper portion and receiving the shank upper portion hemisphere

therethrough to capture the upper portion in the chamber, the retainer super structure being in a temporary

frictional engagement with the shank upper portion prior to locking of the shank in a final position with respect to the receiver with the shank being pivotable with some force with respect to the receiver, the retainer base being in an expanded state and fixed against the receiver when the shank is in a locked position with respect to the receiver, the shank upper portion being pressed against the retainer base and being in spaced relation with the receiver when in the locked position; and

d) an insert in engagement with the shank upper portion and located between the shank upper portion and the portion of the longitudinal connecting member located in the receiver channel, the insert having a pair of opposed upstanding arms, each arm having a second tool receiving aperture formed thereon, the second tool

receiving apertures aligned with the receiver first tool receiving apertures and sized and shaped for direct engagement with lock and release tools.

2. The improvement of claim 1 wherein the insert has an outer surface releasably frictionally locked against the receiver .

3. 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.

4. The improvement of claim 1 wherein the insert further comprises laterally extending portions received by the receiver channel.

5. The improvement of claim 1 wherein the receiver has at least one crimped wall surface pressed into the insert.

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 super structure comprises a plurality of resilient inwardly facing panels in temporary frictional engagement with the shank upper portion.

9. The improvement of claim 8 wherein the panel surfaces are concave.

10. The improvement of claim 1 wherein the retainer super structure comprises a pair of opposed outwardly extending resilient tabs in temporary frictional engagement with the receiver when the shank upper portion hemisphere is received through the retainer base with the tabs being in a compressed state and holding the retainer in an upper portion of the receiver chamber during assembly with the shank upper portion.

11. The improvement of claim 1 wherein the retainer super structure 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 third 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 third pair of receiver apertures.

12. In a polyaxial bone anchor, the improvement

comprising

a) a receiver defining a chamber communicating with a channel, the channel sized and shaped for receiving a portion of a longitudinal connecting member, the chamber partially defined by a first surface having at least one aperture formed therein and a second seating surface located near a bottom opening of the receiver, the chamber communicating with the bottom opening, the receiver having a first tool receiving surface, the first tool receiving surface sloping at an angle oblique to a central axis of the receiver;

b) a shank having a body and an upper curved portion having a hemisphere, the shank body extending through the receiver lower opening;

c) a resilient open retainer located in the chamber, the retainer having a base and a super structure, the base expandable in the chamber about the shank upper portion and receiving the shank upper portion hemisphere

therethrough to capture the upper portion in the chamber, the retainer super structure having at least one resilient outwardly extending tab being compressed inwardly at the receiver during the receiving of the shank upper portion through the retainer base and the tab being in an

outwardly extending neutral state when the retainer base is seated on the receiver second seating surface, the at least one tab extending into the at least one aperture in the receiver first surface with the retainer being

restrained thereby with respect to upward, downward and rotational movement with respect to the receiver; and

d) an insert located at least partially in the chamber, the insert having at least one surface

frictionally engaging the shank upper portion when the retainer and the shank are in a locked engagement, the insert sized and shaped to directly engage and cooperate with lock and release tools, the insert having a second tool receiving surface disposed at an oblique angle to the receiver axis, the second tool receiving surface

positioned in alignment with the receiver first tool receiving surface.

13. The improvement of claim 12 wherein the at least one aperture in the receiver first surface is a pair of opposed apertures and the at least one retainer tab is a pair of opposed resilient tabs, each one of the tabs being received in one of the apertures.

14. The improvement of claim 12 wherein the retainer super structure further comprises a plurality of inwardly facing panels, the panels being in temporary frictional engagement with the shank upper portion prior to locking of the shank in a final position with respect to the receiver .

15. The improvement of claim 12 wherein the insert has a lock and release feature in engagement with the receiver.

16. A bone anchor comprising:

a) a shank having a body for fixation to a bone and an integral upper portion having a first spherical surface; b) a receiver having a top portion and a base, the receiver top portion defining an open channel, the base having a first surface partially defining a cavity, the channel communicating with the cavity, the receiver also having a first tool receiving surface partially defining a through aperture, the tool receiving surface sloping at an oblique angle with respect to a central axis of the

receiver;

c) at least one insert disposed within the receiver and sized and shaped to directly engage and cooperate with lock and release tools, the insert having a second sloping tool receiving surface positioned in alignment with the receiver first tool receiving sloping surface; and

d) a resilient open retainer captured within the cavity and expandable about at least a portion of the shank and wherein expansion-only locking engagement occurs between the shank upper portion and the retainer and between the retainer and the receiver.

17. The bone anchor of claim 16 wherein the retainer has a base and a super structure, the base expandable in the chamber about the shank upper portion and receiving the shank upper portion hemisphere therethrough to capture the upper portion in the chamber, the retainer super structure being in a temporary frictional engagement with the shank upper portion prior to locking of the shank in a final position with respect to the receiver with the shank being pivotable with some force with respect to the receiver, the retainer base being in an expanded state and fixed against the receiver when the shank is in a locked

position with respect to the receiver, the shank upper portion being pressed against the retainer base and being in spaced relation with the receiver when in the locked position .

18. The bone anchor of claim 17 wherein the retainer super structure 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 third 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 third pair of receiver apertures.

19. The bone anchor of claim 16 wherein the insert has an outer surface releasably fractionally locked against the receiver .

20. The bone anchor of claim 16 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.

21. The bone anchor of claim 16 wherein the insert further comprises laterally extending portions received by the receiver channel.