Adjustable rod and connector device and method of use
View Patent ↗A low-profile surgical rod implant device is provided that allows the length of a rod spanning two bone screws to be adjusted at the time of implantation. In a separate aspect of the invention, the rod implant device can be secured by tightening and securing an end of the rod implant device at one of the bone screws. Embodiments are provided for use with polyaxial pedicle screws and substantially straight shank pedicle screws in spinal applications. In a separate aspect of the invention, a bone screw connector having an interference type fit is also provided. A method for implanting the device is also provided.
1. A surgical implant for use with at least one pedicle screw comprising:
a first rod member including a beam;
a second monolithic rod member including an opening sized to circumferentially receive said beam, said second monolithic rod member including an interior hollow chamber for longitudinally receiving at least a portion of said beam, said second monolithic rod member including an upper arm and an opposing lower arm, said upper arm and said opposing lower arm spaced apart by a slot wherein said slot is contiguous with said interior hollow chamber, and wherein said upper arm is moveable to contact said beam and compress said beam between said upper arm and said opposing lower arm; and
means for tightening said second monolithic rod member to secure said beam within said second monolithic rod member, wherein said means for tightening also operates to secure said second monolithic rod member to the at least one pedicle screw; and
wherein the at least one pedicle screw intercepts a longitudinal axis of said beam.
2. The surgical implant as claimed in claim 1 , wherein the longitudinal axis of said beam is substantially coincident with a longitudinal axis of said second monolithic rod member.
3. The surgical implant as claimed in claim 1 , wherein said second monolithic rod member is of one-piece construction.
4. The surgical implant as claimed in claim 1 , wherein said second monolithic rod member further includes a notch spaced apart from said opening.
5. The surgical implant as claimed in claim 1 , wherein said opening has a circular shape.
6. The surgical implant as claimed in claim 1 , wherein said opening has non-circular shape.
7. The surgical implant as claimed in claim 1 , wherein said beam has a circular cross section.
8. The surgical implant as claimed in claim 1 , wherein said beam has a non-circular cross section.
9. The surgical implant as claimed in claim 1 , wherein said means for tightening does not include a set screw.
10. The surgical implant as claimed in claim 1 , further comprising a first end connector attached to said beam and a second end connector attached to said second monolithic rod member.
11. The surgical implant as claimed in claim 1 , wherein said second monolithic rod member further includes an end connector at an end of said lower arm, said end connector including a socket for receiving a head of a pedicle screw.
12. The surgical implant as claimed in claim 11 , wherein said socket includes a hole for a tension link shaft, and said upper arm includes a hole substantially aligned with said hole in said socket.
13. The surgical implant as claimed in claim 1 , wherein a deformable connector is situated within a cavity of the second monolithic rod member, said deformable connector securing a shank of a pedicle screw to said second monolithic rod member upon tightening of said means for tightening.
14. The surgical implant as claimed in claim 13 , wherein said deformable connector is compressed by an upper shoulder of said upper arm, a lower shoulder of said opposing lower arm, and a shank of said means for tightening.
15. The surgical implant as claimed in claim 13 , wherein said deformable connector comprises a groove.
16. The surgical implant as claimed in claim 13 , wherein said deformable connector is substantially disc-shaped.
17. The surgical implant as claimed in claim 13 , wherein at least a portion of said deformable connector comprises a skeletonized structure.
18. The surgical implant as claimed in claim 13 , wherein at least a portion of said deformable connector has a truncated exterior surface.
19. The surgical implant as claimed in claim 13 , wherein said deformable connector comprises an indentation along a portion of an exterior surface.