Surgical instrument for positioning a spinal rod
A surgical instrument including an elongate member, a support for engaging a rod receiving element, and a connection between the elongate member and the support. This connection comprises a pivotal articulation, and the elongate member is connected to the support via the pivotal articulation so as to be able to pivot independently around at least two perpendicular axes. The elongate member is also longitudinally movable with respect to the support. The elongate member has, at a first end, a device for holding a rod.
1. A surgical instrument, comprising:
an elongate member with, at a distal first end, a device for holding a rod;
a support for holding a rod receiving element, wherein the support comprises pliers for grasping the rod receiving element at a distal end of the pliers; and
a connection between the support and the elongate member, the connection comprising a pivotal articulation,
wherein the elongate member is connected to the support via the pivotal articulation so as to be able to pivot independently around at least two non-coincident axes and movable along a longitudinal axis with respect to the support, and
wherein the pivotal articulation comprises a ball-and-socket joint and a through hole in a ball element of the ball-and-socket joint which is suitable for receiving the elongate member, and wherein the elongate member is longitudinally movable in the through hole.
2. The surgical instrument of claim 1 , wherein the pivotal articulation further comprises an inner screw thread within the through hole in the ball element of the ball-and-socket joint, the inner screw thread being engaged with an outer screw thread of the elongated member, and the ball-and-socket joint being lockable in rotation in the axis of the inner and outer screw threads.
3. The surgical instrument of claim 2 , wherein the inner screw thread is formed in an inner surface of a tube held within the through hole in the ball element.
4. The surgical instrument of claim 1 , wherein the elongate member comprises a screw thread, the pivotal articulation comprises a complementary screw thread, and the screw thread of the elongate member is adapted for engagement with the complementary screw thread of the pivotal articulation.
5. The surgical instrument of claim 1 , wherein the elongate member comprises a handle at a proximal second end opposite to the distal first end.
6. The surgical instrument of claim 1 , wherein the device for holding the rod is pivotally and/or rotatably connected to the distal first end of the elongate member.
7. The surgical instrument of claim 1 , wherein, in a closed position of the pliers, two arms of the pliers converge towards the distal end of the pliers, forming a tapering passage between them.
8. The surgical instrument of claim 1 , wherein the connection is releasable.
9. The surgical instrument of claim 8 , wherein the connection comprises a releasable form-locking connector.