IMPACT-DAMPED BIOPSY INSTRUMENT

摘要

A biopsy instrument comprises a canula slidingly disposed in a finger tube having a finger at its distal end. By forward displacement of the finger tube relative to the canula the finger is inserted into an opening in the canula wall near its cutting front edge. Thereby a piece of tissue located inside the canula is severed from living tisue. The instrument has a steel spring compressed against a force of at least 35 N for displacing the canula and the finger tube in the tissue cutting step. The stopper on which the moving canula impacts includes an element of an impact damping design. The impact damping element is made of high impact grade ABS-polymer or a polymer with similar physical properties. It can be used also with known biopsy instruments having a moving canula and/or stylet driven by powerful spring means. Also is described a loading assembly for a biopsy apparatus incorporating the biopsy instrument.