Patent ID: 6168605
Filing Date: 2001-01-02
Classification: A61B

Abstract:
A laparoscopic surgical scissors comprising: a handle body assembly having an actuation member moveable toward and away from said handle body assembly; an elongated shaft defining a shaft longitudinal axis, said elongated shaft having a proximal end and a distal end, and said elongated shaft connected to said handle body assembly at the proximal end of said shaft; a pair of cutting blades having a first blade member and a second blade member co-operably connected about a common pivot member adjacent to the distal end of said elongated shaft, said common pivot member defining a common pivot axis perpendicular to said elongated shaft, said first blade member having a first cutting edge and said second blade member having a second cutting edge facing said first cutting edge, said blade members having a single point of blade contact translating proximally and distally as said blade members open and close in response to movement of said actuation member away from and toward said handle body assembly, each of said blade members defining a curvature along the shaft longitudinal axis and each of the curvatures having a proximal end and a distal end; wherein the curvature of said blade members is defined by a proximal arc of curvature and a distal arc of curvature, said proximal arc of said first blade member having a first radius of curvature and said distal arc of said first blade member having a second radius of curvature, said proximal arc of said second blade member having a third radius of curvature and said distal arc of said second blade member having a fourth radius of curvature, each of the radii of curvature being taken through a common centerline parallel to the common pivot axis and being different from each other, said second radius of curvature of said first blade member being larger than said fourth radius of curvature of said second blade member, and when said first and second blade members are open the ratio of said second radius of curvature of said first blade member to said fourth radius of curvature of said second blade member is between about 1 and about 2.500.