Patent ID: 7390327

Claim:
A bone implantation instrument comprising: a punch having a distal end with a bone cutting tool thereon and a proximal end and a longitudinal axis, the punch including a pivot pin; a guide for guiding the punch into a bone during advancement of the punch, the guide having a fulcrum thereon; and a lever, including a proximal portion having an impaction surface thereon and a distal portion having a slot and a guide fulcrum contacting portion, the lever being rotatably affixed to the punch by the pivot pin engaging the slot and aligned with the punch longitudinal axis in a first rotational position, and the slot in the distal lever portion having a proximal portion and a distal end such that when the lever proximal portion is in alignment with the punch longitudinal axis during advancement of the punch the pivot pin is in the proximal portion of the slot and when the lever is angled with respect to the punch longitudinal axis during extraction of the punch from the bone the guide fulcrum contacts the lever fulcrum contacting portion and the pivot pin contacts the distal end of the slot.