| 主权项 |
1. A bone anchor delivery system comprising:
a retractable punch driver assembly, the retractable punch driver assembly having a retractable punch shaft and a guide for receiving the retractable punch shaft, the retractable punch shaft being linearly movable relative to the guide and the retractable punch shaft having an extended length and a bone penetrating tip at a first end thereof; a bone anchor assembly for attachment onto the retractable punch driver assembly, the bone anchor assembly having a bone anchor having a hollow body, a punch, and an intermediate lock, wherein the entire bone anchor assembly, when installed on the retractable punch shaft extends from the bone penetrating tip of the retractable punch shaft and abuts against the guide; and wherein the intermediate lock is stowed at a distal end portion inside the hollow body of the bone anchor near a proximal end of the punch and when the intermediate lock is moved toward a proximal end of the bone anchor the intermediate lock moves inside and expands the hollow body diametrically to secure the bone anchor to a bone opening, wherein the bone anchor has a plurality of slots which allow the bone anchor to expand diametrically when the intermediate lock is moved proximally into a locked position, the slots each having a fork shape with an upper center slot and two lower slots branched apart to form a locking tab between the two lower slots, wherein the locking tabs move inward as the intermediate lock is moved proximally, and as the intermediate lock passes the locking tabs, the locking tabs block the intermediate lock as the intermediate lock abuts the proximal end of the bone anchor. |
