Patent ID: 7252641

Claim:
A method of obtaining a tissue sample comprising the steps of: positioning a tissue receiving port within a tissue mass; receiving tissue within the receiving port; providing a cutter adapted for advancement with respect to the receiving port; providing a source of rotary motion for providing advancement of the cutter; advancing the cutter relative to a threaded member, to obtain tissue from the tissue mass wherein the threaded member is in communication with the source of rotary motion, wherein the threaded member comprises threading having non-zero pitch, wherein the non-zero pitch is operable to cause the advancing of the cutter wherein the threaded member further comprises threading having zero pitch wherein the zero pitch is operable to cease the advancing of the cutter; varying the speed of advancement of the cutter independently of the rotational speed of the source of rotary motion; and rotating the threaded member without translating the cutter, wherein the act of rotating the threaded member without translating the cutter is performed after the cutter has been advanced to a first position.