Endoscopic biopsy forceps instrument having a constant force spring biasing the jaws closed

摘要: A biopsy forceps instrument includes a flexible coil having one or more pull wires extending therethrough, clevis coupled to the distal end of coil, pair jaws mounted in and wire(s), proximal handle ends wires. The slotted shaft displaceable spool cross member which extends through slot. is wire(s). According invention, at least constant force spring provided between biases direction order maintain closed position. presently preferred embodiment flat wound spiral springs are with free being portion shaft. cavities portions reside grooves on interior flattened extends. Alternative embodiments invention include two end(s) either captured cavity an axle.