Punch for opening passages between two compartments

摘要

A punch for opening passages between two compartments comprises an outer hollow tube and an inner needle tube. The outer hollow tube has a sharp distal edge constituting a circular knife. The needle tube is provided with screw actuating member at a proximal end thereof and a bevelled tip at a distal end thereof. A screw mechanism is located upon a distal end of the needle tube, and the screw mechanism is connected to a cutting disc. The mechanism is screw-actuated by the actuating member. The punch is particularly suitable in cardiac surgery and cardiology as a cardiac catheter and in opening the inter-atrial septum of babies.