Orthopedic fixation devices and methods of installation thereof
The present invention is generally directed to orthopedic fixation devices that comprise a coupling element and a bone fastener, whereby the bone fastener can be loaded into the coupling element through the bottom of a bore in the coupling element. The orthopedic fixation devices described herein can include modular locking clamp assemblies that can be fixed onto fasteners that are already implanted in bone. The modular locking clamp assemblies can include polyaxial locking clamp assemblies, as well as monoaxial locking clamp assemblies.
1. A spinal system comprising:
a bone fastener;
a modular assembly attachable to the bone fastener, wherein the modular assembly comprises:
a tulip element;
a locking clamp assembly positioned in the tulip element, the locking clamp assembly including a clamp element; and
a ring element received in the clamp element to restrict motion between the bone fastener and the tulip element to uniplanar motion.
2. The spinal system of claim 1 , wherein the locking clamp assembly further comprises a wedge element mated to the clamp element.
3. The spinal system of claim 2 , wherein the wedge element comprises a top surface comprising a curved saddle portion.
4. The spinal system of claim 2 , wherein the clamp element comprises a first clamp portion and a second clamp portion independent from the first clamp portion.
5. The spinal system of claim 2 , wherein the ring element comprises a pair of protrusions.
6. The spinal system of claim 5 , wherein the pair of protrusions of the ring element are configured to be received in opposed openings in the clamp element.
7. The spinal system of claim 5 , wherein the ring element comprises an internal opening for receiving a head of the bone fastener.
8. The spinal system of claim 7 , wherein the ring element forms a continuous ring around the internal opening.
9. The spinal system of claim 5 , wherein the protrusions of the ring element are curved.
10. The spinal system of claim 9 , wherein the protrusions are received in curved openings in the clamp element.
11. A spinal system comprising:
a bone fastener;
a modular assembly attachable to the bone fastener, wherein the modular assembly comprises a polyaxial tulip assembly convertible into a uniplanar tulip assembly:
a tulip element; and
a ring element that converts the modular tulip assembly from the polyaxial tulip assembly to the uniplanar tulip assembly when the ring element is positioned in the tulip element to restrict motion between the bone fastener and the tulip element to uniplanar motion
wherein the modular assembly further comprises a locking clamp assembly
wherein the locking clamp assembly comprises a wedge element and a clamp element
wherein the ring element comprises a pair of protrusions,
wherein the pair of protrusions of the ring element are configured to be received in opposed openings in the clamp-element.
12. The spinal system of claim 11 , wherein the wedge element comprises a top surface comprising a curved saddle portion.
13. The spinal system of claim 11 , wherein the clamp element comprises a first clamp portion and a second clamp portion independent from the first clamp portion.
14. The spinal system of claim 11 , wherein the ring element comprises an internal opening for receiving a head of the bone fastener.
15. The spinal system of claim 11 , wherein the protrusions of the ring element are curved.
16. The spinal system of claim 15 , wherein the protrusions are received in curved openings in the clamp element.