POLYPECTOMY SNARE INSTRUMENT WITH ROTATABLE SHAFT

摘要

A surgical snare instrument includes an elongate tubular sheath (12) having proximal (14), and distal (16) ends; a flexible torqued shaft (18) having proximal (20), and distal (22) ends extending through and axially movable relative to the sheath (12); a snare loop (24) at the distal (22) end of the shaft (18); a handle (26) coupled to the proximal ends of the sheath (12), the shaft (18) for moving in the shaft (18) relative to the sheath (12), and for rotating the shaft (18) relative to the sheath (12) such that the snare loop (24), when extended beyond the distal (16) end of the sheath (12), is rotatable relative to the distal (16) end of the sheath (12). The shaft (18) is preferably a multi-filament twisted, and drawn cable. The filaments of the multi-filament twisted, and drawn cable are preferably either stainless steel, nickel-titanium alloy, or a combination of the two. Such a shaft has been demonstrated to provide the high torque ability necessary for controlled rotation of the snare loop.