Importance

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Abstract

A linear stapler particularly adapted for open surgical procedures is disclosed. Staples are fired when tissue is clamped between the cartridge and anvil of the staple fastening assembly of the stapler, and the firing trigger is pivotally rotated in a counterclockwise direction from an unfired position to a fired position adjacent the hand grip of the frame of the stapler. Resistance to the pivotal rotation of the firing trigger independent of the staple fastening assembly is provided to inhibit the surgeon from inadvertently firing the staples or partially firing the staples from the cartridge against the anvil. The firing bar is sandwiched between two spacer plates secured to the firing bar, and a stationary slot pin must overcome the resistance of detents displayed on slots in the spacer plates when the firing bar is moved distally to fire the staples. An audible signal is also provided to alert the surgeon when staples have been fully fired. One of the spacer plates has a signal spring and pin which interacts with a signal ramp attached within the frame. As staples are being fired, the ramp deflects the pin, and when firing is complete, the spring disengages from the ramp and impacts the inside of the frame to provide an audible signal. Although the invention is described in connection with an open linear stapler, it is broadly applicable to other surgical fastening instruments, including endoscopic linear staplers.

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First Claim