Patent ID: 7300447

Claim:
A working tool for a resectoscope for side-to-side resection of biological tissue using determined lateral movement, said working tool having a distal end which is inserted into a body cavity, a proximal end which is adjacent to a user, and a longitudinal axis, and wherein said tool includes: a rotation mechanism which includes; a handle assembly located at said proximal end of said tool, which includes at least two handles, at least one handle being movable in the longitudinal direction of the tool; a drive screw in communication via a cam element with said handle assembly, said drive screw positioned along the longitudinal axis and rotatable there around upon a predetermined translation of said at least one movable handle, the translation transformed to a rotation by said cam element; the drive screw is anchored within said working tool by at least one linear lock, which prevents said screw from traveling along the longitudinal axis (x-axis) of working tool, allowing it to rotate around said axis; said cam element travels linearly along said drive screw, thereby causing said drive screw to rotate around the longitudinal axis of said working tool; at least one cutting member assembly positioned at said distal end of said tool, and each of said at least one assembly includes: a cutting member axle connected by at least one connecting element to said drive screw, said cutting member axle thereby being rotatable upon rotation of said drive screw; and at least one cutting member connected to said cutting member axle and positioned at an end of said cutting member axle distal from said drive screw, said cutting member, when held in a determined position with respect to tissue to be resected, being operable to rotate and resect tissue to a predetermined depth in a substantially side-to-side manner upon rotation of said cutting member axles, wherein a chassis of said working tool is fitted with at least one snap-in element positioned along said chassis's length, and wherein said cutting member axle is positioned and held within said at least one snap-in element while being free to rotate around the tool's longitudinal axis (x-axis).