Ultrasonic device for cutting and coagulating

A wrench assembly for use with a surgical instrument comprising a handle assembly and a body member pivotably coupled to the handle assembly, wherein the handle assembly comprises a first finger ring, an ultrasonic blade, and a waveguide extending from the ultrasonic blade, wherein the body member comprises a second finger ring, a clamp arm movable relative to the ultrasonic blade to capture tissue therebetween, a first body surface defined on a first side of the body member, and a second body surface defined on a second side of the body member, wherein the wrench assembly comprises:

• a wrench defining a longitudinal axis, wherein the wrench comprises:
• an arm;
• and
• a tooth extending from the arm toward the longitudinal axis;
• and
• an adapter operably coupled to the wrench, wherein the adapter comprises:
• a first wrench surface configured to engage the first body surface;
• a second wrench surface configured to engage the second body surface;
• a shaft;
• and
• a spline gear extending from the shaft, wherein the tooth is configured to engage the spline gear based on rotation of the wrench, and wherein the arm is configured to flex away from the longitudinal axis based on a threshold force being applied to the wrench;
• wherein the wrench comprises a plurality of arms comprising the arm, and wherein the plurality of arms extend circumferentially around the longitudinal axis.

An ultrasonic surgical system, comprising:

• a surgical instrument, comprising:
• a handle comprising a first finger grip;
• a body pivotably coupled to the handle, wherein the body comprises:
• a second finger grip;
• a clamp arm extending from the second finger grip;
• a first body surface defined on a first side of the clamp arm;
• and
• a second body surface defined on a second side of the clamp arm;
• and
• a wrench assembly, comprising:
• a wrench;
• and
• an adapter operably coupled to the wrench, wherein the adapter comprises:
• a first wrench surface configured to interface with the first body surface;
• and
• a second wrench surface configured to interface the second body surface.