Abstract: A surgical instrument includes an elongate tubular member, an end effector at the distal end of the tubular member, a linkage rod slidably disposed within the tubular member, a distal connector fixed to the proximal end of the tubular member, a proximal connector fixed to the proximal end of the linkage rod, at least one resiliently flexible actuating member, and a lever pivotally to the proximal connector. The lever generally overlies and contacts the actuator member. Pivoting of the lever toward the flexible actuator member causes the linkage rod to move a movable jaw of the end effector. The surgical instrument has a relatively larger actuator surface for easier manipulation, and better balance. The actuator member also has a point of maximum leverage closer to the distal end, than other surgical instruments of the same general type.

Abstract: A surgical instrument includes laterally opposing members, an end effector having opposing jaws movable with respect to each other, a resilient member operably biasing the laterally opposing members away from each other, and an improved ratchet locking device. The ratchet locking device includes a first toothed plate mounted on one of the laterally opposing members, and a second toothed plate pivotally mounted on the other laterally opposing member. The second toothed member is pivotable between a first position in which the plates are engaged and a second position in which the plates are disengaged. A spring member is used for biasing the plates into engagement. A release member is provided for retaining the toothed plates in a disengaged position. The release member is mounted on one of the laterally opposing members and includes a cam surface engagable with a follower on one of the toothed plates.