Different exemplary embodiments of cannula tools each perform multiple functions. Each cannula tool is able to dislodge or cut away a biopsy sample from a desired site within a patient's body, and then collect the sample. The cannula tool, which is disposed at the distal end of an elongate flexible tube...http://www.google.com.tw/patents/US20080243030?utm_source=gb-gplus-share專利 US20080243030 - MULTIFUNCTION CANNULA TOOLS
