| 主权项 |
1. An endoscopic scissors instrument, comprising:
a) a tubular member having proximal and distal ends and defining a longitudinal axis; b) a control member having proximal and distal ends and extending through said tubular member; c) a clevis coupled to the distal end of said tubular member; d) an end effector assembly comprising first scissors and second scissors blades, at least one of said scissors blades mounted to said clevis and movable relative to the other scissors blade, said distal end of said control member coupled to said at least one movable scissors blade,
said first scissors blade having a medial surface, a ground surface, and a sharp cutting edge at an intersection of said medial and ground surfaces, and a lateral surface opposite said medial surface, andsaid second scissors blade having a medial surface, a ground surface, and a sharp cutting edge at an intersection of said medial and ground surfaces, and a lateral surface opposite said medial surface, andsaid at least one of said ground or lateral surfaces of said first and second scissors blades including a metal or a carbon composite, sheet-form friction enhancing tissue stop, discretely formed from the first and second scissors blades, that is configured to pierce into tissue located between said cutting edges of said first and second scissors blades as the tissue is cut by said cutting edges, said tissue stop mounted within or on said ground or lateral surfaces, extends laterally adjacent with at least a portion of said cutting edge of said respective blade, extends above said ground surface, and is laterally offset from said cutting edge of said respective blade; and e) a proximal handle assembly coupled to said proximal ends of said tubular member and said control member for moving said control member and said tubular member relative to each other to effect relative movement of the scissors blades between open and closed positions. |
