Forceps for extracting stones in the pelvis of a kidney

Claim 1

A forceps for extracting stones in the pelvis of a kidney comprising: a pair of shanks pivotally connected to each other, each of said shanks having two opposite ends; a pair of finger rings, each of said finger rings being coupled to one of said two opposite ends of a respective shank, said finger rings being movable relative to each other in a plane to pivotally move said shanks relative to each other about the pivotal connection of said shanks; a pair of elongate arms each secured to the other end of a respective shank, each of said elongate arms having a distal end and a proximal end, the distal end of each elongate arm being more remote from the corresponding finger ring than the proximal end and the distal ends of each elongate arm being curved to deviate from the plane in which said finger rings are movable, at least one of said elongate arms being a tubular member into which a front viewing type telescope is insertable, said at least one tubular elongate arm having an intermediate part connected to said other end of the corresponding shank and having a curved part located between said intermediate part and said proximal end of said at least one elongate arm, said curved part being curved in a direction to extend away from both of said shanks, the direction of curvature of said curved part being that direction in which said curved part is separated in said plane from the finger ring provided on the other shank so that the portion of said tubular elongate arm between said intermediate part and said proximal end is substantially spaced away from said other shank; said shank which is connected to said intermediate part of said tubular elongate arm angularly extending away from said tubular elongate arm in a direction opposite to the direction of curvature of said curved part of said tubular elongate arm; the pivotal connection of said shanks to each other being spaced a substantial distance from said tubular elongate arm; a telescope which is insertable into said at least one tubular elongate arm; and a pair of mutually facing stone-clamping members secured to respective distal ends of said elongate arms so as to be in the field of view of a telescope inserted into said tubular elongate arm.