System and Method for Bone Anchorage
A bone anchor assembly may include a fixation member securable to a bone, a coupling member, a compressible member and a locking member. The fixation member may be formed monolithically with the coupling member, and the coupling member may have a loop portion shaped to receive the compressible member. The compressible member may comprise a compressible sphere with a bore extending therethrough, the bore shaped to receive an elongated member. The locking member may be actuable through an aperture in the coupling member to urge compression of the compressible member to lock the elongated member in a fixed position. The compressible member may be polyaxially adjustable relative to the coupling member.
1 . A surgical system comprising:
a bilateral inferior facet joint replacement implant comprising:
a first articulation body;
a second articulation body;
a first coupling body operably coupled to the first articulation body;
a second coupling body operably coupled to the second articulation body;
a first inferior strut received in the first coupling body;
a second inferior strut received in the second coupling body; and
a crosslink in the shape of a half-pipe body for receiving the first inferior strut and the second inferior strut.
2 . The surgical system of claim 1 , wherein the first articulation body and the second articulation body each comprise a spherical member attached to an articulation surface.
3 . The surgical system of claim 2 , wherein the spherical member includes a flattened surface.
4 . The surgical system of claim 1 , wherein the first coupling body and the second coupling body are each configured to receive a compressible member.
5 . The surgical system of claim 4 , wherein the compressible member comprises an interior cavity partially enclosed by fingers.
6 . The surgical system of claim 4 , wherein the compressible member comprises a trough for receiving the crosslink.
7 . The surgical system of claim 1 , wherein the bilateral inferior facet joint replacement further comprises a first set screw received in the first coupling body and a second set screw received in the second coupling body.
8 . The surgical system of claim 1 , wherein the first inferior strut comprises a first end that bends into a second end.
9 . The surgical system of claim 8 , wherein the second inferior strut comprises a first end that bends into a second end.
10 . The surgical system of claim 9 , wherein the half-pipe crosslink is configured to receive the second end of the first inferior strut and the second end of the second inferior strut.
11 . The surgical system of claim 10 , wherein the second end of the first inferior strut and the second end of the second inferior strut do not contact each other when received in the crosslink.
12 . A surgical system comprising:
a bilateral inferior facet joint replacement implant comprising:
a first articulation body;
a second articulation body;
a first coupling body operably coupled to the first articulation body;
a second coupling body operably coupled to the second articulation body;
a first inferior strut received in the first coupling body;
a second inferior strut received in the second coupling body;
a first set screw received in the first coupling body on top of the first inferior strut; and
a second set screw received in the second coupling body on top of the second inferior strut.
13 . The surgical system of claim 12 , wherein the first articulation body comprises a spherical member attached to an articulation surface.
14 . The surgical system of claim 13 , wherein the spherical member includes a flattened surface.
15 . The surgical system of claim 12 , further comprising a first compressible member received in the first coupling body.
16 . The surgical system of claim 15 , wherein the first compressible member comprises a trough for receiving a portion of a crosslink therein.
17 . The surgical system of claim 12 , further comprising a crosslink that extends between the first coupling body and the second coupling body.
18 . The surgical system of claim 17 , wherein the crosslink comprises an open half-pipe.
19 . The surgical system of claim 18 , wherein the crosslink receives a portion of the first inferior strut and a portion of the second inferior strut.
20 . The surgical system of claim 19 , wherein the first inferior strut and the second inferior strut are not in direct contact.