Abstract: A cutting guide for assuring that mating bone segments will be properly aligned following excision of the joint therebetween comprises first and second alignment bar segments hingedly joined, end-to-end, whose angle of inclination therebetween can be readily set and fixed, is clamped to a toe to be treated by a pair of transversely extending arm members that can be clamped to the metatarsal and phalangeal bones. The coupling between the arm clamped to the metatarsal bone and its associated alignment bar segment allows limited rotation and fixing of the alignment bar. A cutting blade guide member having a blade receiving slot is adjustably mounted to and parallel with the clamping arm affixed to the phalangeal bone. The resulting cuts made through the head of the metatarsal bone and the base of the phalangeal bone on either side of the joint being removed will provide a predetermined inclination and direction to the toe following fusion thereof.

Abstract: An endoscopic lithotriptor including an elongated, flexible stone impacting member in the form of a wire whose distal end is brought against a stone to be broken and whose proximal end is adapted to be periodically struck by a hammer element. The hammer element is pneumatically driven by a linear jet of air causing it to swing through an arc about a pivot to impact an anvil affixed to the wire and oriented tangentially to the arc swept out by the hammer. The pneumatic chamber structure in which the hammer is pivotally mounted is designed to maximize the angular velocity reached by the hammer before impacting the anvil.

Abstract: An endoscopic lithotriptor including an elongated, flexible stone impacting member in the form of a wire whose distal end is brought against a stone to be broken and whose proximal end is adapted to be periodically struck by a hammer element. The hammer element is pneumatically driven by a linear jet of air causing it to swing through an arc about a pivot to impact an anvil affixed to the wire and oriented tangentially to the arc swept out by the hammer. The pneumatic chamber structure in which the hammer is pivotally mounted is designed to maximize the angular velocity reached by the hammer before impacting the anvil.