Knife deployment mechanisms for surgical forceps

摘要

A surgical instrument includes an end effector assembly having jaw members movable between spaced-apart, first approximated, and second approximated positions. A knife is selectively movable relative to the end effector assembly between a retracted position, a first extended position, and a second extended position. A trigger is selectively actuatable between a un-actuated position, a first actuated position, and a second actuated position for moving the knife between its respective positions. A control member prevents movement of the trigger when the jaw members are disposed in the spaced-apart position, permits movement of the trigger to the first actuated position but prevents movement beyond the first actuated position when the jaw members are disposed in the first approximated position, and permits movement of the trigger to the second actuated position but prevents movement beyond the second actuated position when the jaw members are disposed in the second approximated position.

主权项

1. A surgical instrument, comprising:
an end effector assembly having first and second jaw members, at least one of the jaw members movable relative to the other between a spaced-apart position, a first approximated position defining a first gap distance therebetween, and a second approximated position defining a second gap distance therebetween; a knife selectively movable relative to the end effector assembly between a retracted position, a first extended position in which the knife extends between the jaw members a first distance, and a second extended position in which the knife extends between the jaw members a second distance; a trigger selectively actuatable between a un-actuated position, a first actuated position, and a second actuated position for moving the knife between the retracted position, the first extended position, and the second extended position; and at least one control member operably coupled to the trigger, the at least one control member configured to: prevent movement of the trigger from the un-actuated position when the jaw members are disposed in the spaced-apart position, permit movement of the trigger from the un-actuated position to the first actuated position and prevent movement of the trigger beyond the first actuated position when the jaw members are disposed in the first approximated position, and permit movement of the trigger from the un-actuated position to the second actuated position and prevent movement of the trigger beyond the second actuated position when the jaw members are disposed in the second approximated position.