Retrograde cutting hook punch

Claim 1

A retrograde cutting hook punch for performing an operation in a knee joint, comprising a longitudinal axis, a barrel having a proximal end, a distal end and a traction and thrust rod therethrough, a pivotable jaw member and a fixed jaw member, each of the jaw members being located at the distal end of the barrel, the pivotable jaw member, which is operated by the traction and thrust rod, being pivotably movable about a pivot axis in a retrograde direction between a first position wherein the pivotable jaw member abuts the traction and thrust rod and a second position wherein the pivotable jaw member abuts the fixed jaw member, each jaw member having a first portion extending outwardly from the barrel towards the proximal end thereof at an angle to the barrel and the longitudinal axis of the punch, each jaw member having one end remote from the pivot axis of the pivotable jaw member, said first portion of said fixed jaw member including a slot for complementarily receiving the first portion of the pivotable jaw member to form a cutting edge, the pivotable jaw member having an axially directed second portion which is pivotable in a longitudinal slot defined in a second portion of the fixed jaw member, the pivotable jaw member defining a downwardly open longitudinal slot for receiving the traction and thrust rod.