Forceps device for endoscope

Claim 1

A forceps device to be inserted through an endoscope into a body cavity, comprising an outer covering tube, a forceps holder attached to one end portion of said outer covering tube, a pair of forceps levers each having operating end portions forming jaws, connecting end portions and intermediate portions therebetween pivotally supported on said forceps holder, means for operating said levers consisting of a pair of links each respectively pivotally connected to said one end of said connecting end portions of said forceps levers, a wire coupling pivotally connected to the other ends of said pair of links at a pivot point, and a wire having one end connected to said wire coupling and the other end extended through said outer covering tube, therealong, said pair of forceps levers and said pair of links constituting a toggle joint whereby when said wire coupling has been moved by pulling the same from its other end, said links are moved to a position approaching a substantially straight line drawn between the pivots connecting said forceps levers and links, and the pivot point of said wire coupling, said forceps levers being rocked through said links to permit said operating end portions of said levers to be moved in a clamping direction approaching each other.