A surgical implant device that controls the relative movement between a first bone or tissue portion and a second bone or tissue portion. The device has a first connector member connected for movement with the first bone or tissue portion and a second connector member connected for movement with the second bone or tissue portion. A biasing member pivotally connects the first connector member to the second connector member and resists the relative rotation between the first connector member and the second connector member.
1. A surgical implant device that controls the relative movement between a first tissue portion and a second tissue portion, comprising:
a first connector member adapted to be connected for movement with the first tissue portion;
a second connector member adapted to be connected for movement with the second tissue portion;
a biasing member pivotally connecting the first connector member to the second connector member, the biasing member centered on a pivotal axis; and
wherein the biasing member resists the relative rotation between the first connector member and the second connector member;
wherein the first connector member further comprises a mounting portion having an aperture for connecting the first connector member to an anchoring device and the second connector member further comprises a mounting portion having an aperture for connecting the second connector member to a rod, wherein the rod is disposed substantially perpendicular to the pivotal axis; and
wherein the biasing member is coupled to the second member and disposed within the first connector member, and wherein a stop coupled to the second connector member is disposed about the biasing member.
2. The device of claim 1 , wherein the anchoring device is a pedicle screw.
3. The device of claim 1 , wherein the resistance to the movement of the first connector member relative to the second connector member increases as the first connector member rotates relative to the second connector member from an unloaded position.
4. The device of claim 1 , wherein the stop limits the movement of the first connector member relative to the second connector member.
5. The device of claim 1 , wherein the biasing member is a spring.
6. The device of claim 1 , wherein the second connector member and the biasing member are a unitary construction and an end of the biasing member is connected to the first connector member.
7. The device of claim 6 , wherein the end of the biasing member is welded in a chamber of the first connector member.
8. The device of claim 6 , wherein the end of the biasing member is press fit in a chamber of the first connector member.
9. The device of claim 6 , wherein the biasing member is formed by spiral cutting a portion of the second connector member.
10. The device of claim 6 , wherein the second connector member comprises an outer member.
11. The device of claim 10 , wherein the first connector member is rotatable relative to the outer member.
12. The device of claim 10 , wherein the stop is coupled to the outer member.
13. The device of claim 12 , wherein the stop comprises at least one projection of the outer member and at least one projection of the first connector member.
14. The device of claim 1 , wherein the first connector member, the biasing member, and the second connector member are a unitary construction.
15. The device of claim 14 , wherein the biasing member is formed by spiral cutting a portion of the device between the first connector member and the second connector member.
16. The device of claim 1 , wherein the stop is internal to the device and comprises a bore, wherein an edge of the bore interferes with a rod connected to the second connector member.
17. The device of claim 1 , wherein the device comprises at least one elastic band that resists the movement of the first connector member relative to the second connector member.
18. A surgical implant device that controls the relative movement between a first tissue portion and a second tissue portion, comprising:
a first connector member adapted to be connected for movement with the first tissue portion;
a second connector member adapted to be connected for movement with the second tissue portion;
a biasing member pivotally connecting the first connector member to the second connector member, the biasing member centered on a pivotal axis; and
wherein the biasing member resists the relative rotation between the first connector member and the second connector member;
wherein the first connector member further comprises a mounting portion having an aperture for connecting the first connector member to an anchoring device and the second connector member further comprises a mounting portion having an aperture for connecting the second connector member to a rod, wherein the rod is disposed substantially perpendicular to the pivotal axis;
wherein the first connector member, the biasing member, and the second connector member are a unitary construction, wherein the biasing member is formed by spiral cutting a portion of the device between the first connector member and the second connector member; and
wherein the device comprises a stop limiting the movement of the first connector member relative to the second connector member, and wherein the stop is internal to the device and comprises a bore, wherein an edge of the bore interferes with a rod connected to the second connector member.