Abstract: This stapler includes two scissors-type clamping devices which carry a disposable four-piece stapling cartridge in the form of two pairs of cooperating, arcuate stapling elements. Each device supports a cooperating pair of the stapling elements around one of two, tubular tissues, the ends of which are secured in inverted, confronting positions over operating surfaces on the respective pairs of elements by pins which project from the outer surfaces of the elements. At least one pair of the elements contains a plurality of movable staple pushers and a pair of arcuate knives, which are engagable with wedge-shaped actuators that are operated by a pair of pliers on each device. When operated by the pliers the actuators drive the staple pushers and knives substantially simultaneously toward the operating surfaces of the elements, thereby driving a circular array of staples through the everted tissue ends, and trimming away excess tissue around the outside of the circular staple array.

Abstract: A surgical stapling tool 10 using disposable cartridge elements includes an actuator 13 that moves toward and away from a staple folding anvil 20, a holder 22 for an array of staples oriented toward anvil 20, staples and a pusher 23 for pushing staples from holder 22 through tissue 30 and against anvil 20. Pusher 23 is shaped relative to actuator 13 to mount on the actuator in a retention fit and move with the actuator toward anvil 20. Holder 22 is shaped for a retention fit on pusher 23 to move with the pusher independently of the actuator and anvil. Actuator 13 advances pusher 23 and holder 22 until the holder is pressed against tissue 30 and stops. Then further advance of the actuator overcomes a predetermined frictional resistance between the pusher and holder, forces the pusher into the holder, and drives the staples through tissue 30 and against anvil 20 to accomplish the stapling. This eliminates clamping the staple holder against the tissue and avoids damaging the tissue from overclamping.