BIOPSY DEVICE WITH VARIABLE SPEED CUTTER ADVANCE

摘要

A biopsy device (20) having a translating and rotating cutter (104) disposed within an outer cannula (80) is disclosed. The translational speed of the cutter (104) is varied using a variable pitch member (142). The variable pitch member (142) can include a shaft having a relatively coarse threaded portion (146) for rapid cutter advance and a relatively finer threaded portion (148) for cutter advance during tissue severing.