Posterior spinal stabilization plate device
A device for connecting two spinal rods is provided. In one form, the device includes two clamping devices for receiving and locking to spinal rods and a central bridge or plate member that couples the clamping devices. In one aspect, the clamping devices are unitary members with deflectable jaw portions that snap-fit and then locked by operation of actuators. In another aspect, one or both of the clamping devices are adjustably coupled to the central bridge or plate member to allow at least translation and pivoting or rotation of the clamping devices relative to a central axis of the elongate bridge member. The clamping devices may be coupled to the bridge or plate member with the same locking actuator that causes clamping of the clamp device so that the positions of the clamp device and the spinal rod are locked into place by manipulation of only a single locking actuator.
1. A posterior spinal stabilization plate device comprising:
a plate body having a plurality of apertures for receiving anchor members;
a guide track connected to the plate body;
at least one clamp device having a resiliently deflectable jaw portion and a threaded portion, the clamp device slidably coupled to the guide track; and
a rotary locking actuator member having a threaded portion for being threadingly connected to the threaded portion of the clamp device and being operable to be rotated for being shifted into direct engagement with the deflectable jaw portion to resiliently shift the resiliently deflectable jaw portion into locking engagement with a spinal rod and to fix the clamp device against sliding along the guide track.
2. The posterior spinal stabilization plate device of claim 1 wherein the guide track includes a guide slot, and the rotary locking actuator member includes an elongate shank portion configured to extend through the guide slot to be slidably disposed therein.
3. The posterior spinal stabilization plate device of claim 2 wherein the elongate shank portion has a distal end portion including a cam surface that is configured for shifting into direct camming engagement with the deflectable jaw portion.
4. The posterior spinal stabilization plate device of claim 1 wherein the rotary locking actuator member includes a proximal head portion including a cam surface that is configured for shifting into direct camming engagement with the deflectable jaw portion.
5. The posterior spinal stabilization plate device of claim 1 wherein the clamp device includes a body portion that cooperates with the resiliently deflectable jaw portion to form an arcuate recess in which the spinal rod is received to be locked therein by the resiliently deflectable jaw portion.
6. The posterior spinal stabilization plate device of claim 1 wherein the plate body has a longitudinal axis, and the plurality of apertures include multiple apertures aligned along the longitudinal axis, and the guide track extends laterally transverse to the longitudinal axis.