Jaw

An ultrasonic surgical apparatus, comprising;

• a housing;
• an outer actuating tube carried by said housing, said outer actuating tube having distal and proximal ends;
• an inner tube carried by said housing, said inner tube having distal and proximal ends;
• a blade member carried by said housing, said blade member having an elongate shaft and an end effector located at a distal end of the blade member, said blade shaft positioned at least partially within the interior of said outer actuating tube;
• a clamp arm connected to said outer actuating tube and inner tube adjacent the distal end of the blade member, said clamp arm configured for selective pivotal movement towards the end effector of said blade member such that, during use, pivotal movement of the clamp arm toward the end effector of the blade member may be used to compress tissue against said end effector
• wherein said surgical apparatus is configured for the operative coupling to a source ultrasonic vibration such that said blade shaft transmits ultrasonic vibrations along its length to said end effector,
• and further wherein said clamp arm having a cam slot comprising at least one cam surface such that the outer actuating tube may be reciprocally moved with respect to said housing in a direction parallel to the longitudinal axis of said blade shaft, with reciprocal movement of the outer actuating tube toward the distal end of said blade member causing pivotal movement of said clamp arm towards said end effector of the blade member.