Connector transfer tool for internal structure stabilization systems
View Patent ↗A tool is described for use in a stabilization system for bony structures such as vertebrae, where the system involves connected a connector from one bone anchor in a vertebra to a second bone anchor in another vertebra. The tool includes a handle attached to an arm. The arm is connected by a pivot to a connector engagement mechanism, the pivot allowing the connector engagement mechanism to move from an orientation inline with the arm to an orientation at an angle relative to the arm by rotating at the pivot. The connector engagement mechanism is engaged to an end of the connector when the tool is in its inline orientation and by causing the movement, which can be by the movement of a lever on the handle, of the connector engagement mechanism to the angled orientation, the end of the connector is moved into a position for engagement with the second bone anchor.
1. A method comprising:
providing a first bone anchor with a connector movably connected thereto and a second bone anchor assembly;
engaging an end of said connector in a connector engagement mechanism of a tool, said tool also including an arm connected to said connector engagement mechanism by a pivot which allows said connector engagement mechanism to move between a first and second position;
pushing at least one tine of said connector engagement mechanism along a ramp in said end of said connector and into a recess in said end of said connector to engage said end of said connector;
causing said connector engagement mechanism to move between said first and second position, thereby moving said end of said connector toward said second bone anchor assembly; and
disengaging said end of said connector from said connector engagement mechanism.
2. The method of claim 1 wherein causing said connector engagement mechanism to move comprises:
moving a lever of said tool, thereby causing said connector engagement mechanism to move from said first position to said second position.
3. The method of claim 1 wherein said disengaging said connector end comprises:
causing said tine to move out an exit in said recess when said connector engagement mechanism approaches said second position.
4. The method of claim 3 wherein causing said tine to move out said exit is performed in part by a cam connected to said connector engagement mechanism.
5. The method of claim 1 further comprising before engaging:
inserting said tool into a cannulated extension holding said connector.
6. The method of claim 5 wherein said causing said connector engagement mechanism to move from said first position to said second position results in said end of said connector to exit said cannulated extension through an opening in said extension.
7. The method of claim 6 wherein said causing said connector engagement mechanism to move from said first position to said second position further results in said connector end entering a second cannulated extension through a window in said second cannulated extension.