Patent ID: 8512343

Claim:
An instrument for approximating a misaligned bone anchor toward a spinal rod extending along a patient's spinal column, the instrument comprising: a first clamp configured to attach to a first location on the spinal rod; a second clamp configured to attach a second location on the spinal rod; a bone anchor engagement portion disposed between the first and second clamps and configured to engage the misaligned bone anchor that is laterally displaced from the spinal rod and misaligned from a location on the spinal rod between the first location and the second location; a first winch mechanism connecting the first clamp to the bone engagement portion, wherein the first winch mechanism adjusts a first distance between the first clamp and the bone anchor engagement portion; and a second winch mechanism connecting the second clamp to the bone engagement portion, wherein the second winch mechanism adjusts a second distance between the second clamp and the bone anchor engagement portion, wherein the first winch mechanism is actuated independently of the second winch mechanism, wherein the bone anchor engagement portion is adapted to move toward the spinal rod in a direction substantially perpendicular to a central axis of the patient's spinal column by adjusting the first distance and the second distance.