Rod coercer
A rod coercer for use in spinal fixation procedures is provided. The rod coercer can be pivoted in a first direction to fixedly grip an implant, and pivoted in a second direction to reduce a rod into the implant. In one embodiment, the rod coercer includes first and second articulating handle branches, first and second rod contacting arms extending from the first and second handle branches, first and second implant gripping arms pivotally interconnected with the first and second handle branches, and means for releasably locking the handle branches and the implant gripping arms in a closed and locked position. In another embodiment, the implant gripping arms of the rod coercer can be secured to each other by a flexible retainer.
1. A rod coercer, comprising:
first and second pivotally interconnected handle branches;
first and second rod contacting arms directly attached to the first and second handle branches and each of the first and second rod contacting arms shaped to form a surface to contact a rod, the first rod contacting arm directly attached to the first handle branch and the second rod contacting arm directly attached to the second handle branch;
first and second implant gripping arms pivotally interconnected with the first and second handle branches; and
means for releasably locking the first and second handle branches in a fixed position with respect to each other;
wherein the first and second implant gripping arms are fixedly attachable to an implant, the first and second handle branches are pivotable about a first axis to fixedly clamp the first and second implant gripping arms against the implant, and the first and second handle branches are pivotable about a second axis different from the first axis to urge the rod and the implant together to reduce the rod into the implant.
2. The rod coercer of claim 1 , wherein the first and second implant gripping arms include cylindrical inner surfaces contacting a head of the implant, and shoulders abutting the head of the implant.
3. The rod coercer of claim 1 , wherein each rod contacting arm comprises a curved surface.
4. The rod coercer of claim 1 , wherein each handle branch comprises a finger loop for receiving an operator's finger.
5. The rod coercer of claim 1 , wherein the means for releasably locking the first and second handle branches comprises locking tabs.
6. The rod coercer of claim 1 , wherein the means for releasably locking the first and second handle branches comprises a ratchet assembly.
7. The rod coercer of claim 6 , wherein the ratchet assembly further comprises a toothed lever and a pawl.
8. The rod coercer of claim 1 , further comprising a roller on an end of at least one of the rod contacting arms.
9. The rod coercer of claim 1 , further comprising a flexible retainer interconnecting the implant gripping arms.
10. The rod coercer of claim 9 , wherein the flexible retainer is generally arched when the implant gripping arms are in a closed arrangement.
11. The rod coercer of claim 9 , wherein the flexible retainer allows the implant gripping arms to maintain a facing relationship with each other as the implant gripping arms are pivoted away from each other.
12. The rod coercer of claim 1 , further comprising a cannula positioned between and engaged with the implant gripping arms to guide a set screw.