A surgical snare instrument includes a tubular sheath having proximal and distal ends, a flexible shaft having proximal and distal ends extending through and axially movable relative to the sheath, a snare loop at the distal end of the shaft, and a handle assembly coupled to the proximal ends of the...http://www.google.es/patents/US6015415?utm_source=gb-gplus-sharePatente US6015415 - Polypectomy snare instrument
