Importance

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Abstract

Apparatus for applying fasteners during endoscopic surgery includes a handle portion, a triggering mechanism and a fastener application. The fastener applicator is detachable from the handle portion by virtue of a rotational locking system and may be replaced with a new fastener applicator having a fresh load of vertically stacked fasteners. The fastener may be formed around a single point on an anvil. The fastener applicator having only one actuated part in its applicator mechanism, and makes use of biased springs controlled by the position of the actuated part for the remaining part of the mechanism. Another embodiment of the invention deploys a plunger/ratchet assembly and pawl within the handle portion of the apparatus to ensure that the apparatus applicator mechanism will not reverse in the middle of a triggered application stroke. A method of applying a fastener includes the following steps: moving a fastener from a storage channel, where it has been vertically stacked, to a driving channel by a biased fastener positioning spring as a slide is retracted; advancing the slide until the slide engages the fastener in the driving channel and drives the fastener over an anvil to form the fastener. During advancement of the slide a biased stop spring is forced back into a recess thereby allowing the next fastener to move forward in the storage channel in response to the force of a biased pusher spring; retracting the slide thereby freeing the biased ejector springs to kick the formed fastener off the end of the anvil; and further retracting the slide until the fastener positioning spring is once again free to move the distal-most fastener from the storage channel into the driving channel.

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First Claim