Blade cooling gas/fluid storage

A surgical instrument, comprising:

• (a) a shaft assembly, including:
• (i) an acoustic waveguide configured to couple with an ultrasonic transducer, and
• (ii) a rotation knob operatively coupled to the shaft assembly, wherein the shaft assembly defines a longitudinal axis and the rotation knob is configured to rotate the shaft assembly about the longitudinal axis;
• (b) an end effector, including:
• (i) an ultrasonic blade in acoustic communication with the acoustic waveguide, and
• (ii) a clamp arm movably coupled relative to the ultrasonic blade and configured to move from an open position toward a closed position for compressing a tissue against the ultrasonic blade;
• (c) a clamp actuator configured to selectively move from a first actuator position toward a second actuator position, wherein the clamp actuator is operatively coupled to the clamp arm to thereby direct movement of the clamp arm from the open position toward the closed position as the clamp actuator respectively moves from the first actuator position toward the second actuator position;
• (d) a blade cooling system operably coupled to the clamp actuator and selectively operable to discharge fluid coolant onto the ultrasonic blade while the clamp actuator is in the first actuator position, comprising:
• (i) a fluid reservoir defined by a cavity within the rotation knob, and
• (ii) a plunger positioned within the fluid reservoir.

A surgical instrument, comprising:

• (a) a shaft assembly including an acoustic waveguide configured to couple with an ultrasonic transducer;
• (b) an end effector, including:
• (i) an ultrasonic blade in acoustic communication with the acoustic waveguide, and
• (ii) a clamp arm movably coupled relative to the ultrasonic blade and configured to move from an open position toward a closed position for compressing a tissue against the ultrasonic blade;
• (c) a clamp actuator configured to selectively move from a first actuator position toward a second actuator position, wherein the clamp actuator is operatively coupled to the clamp arm to thereby direct movement of the clamp arm from the open position toward the closed position as the clamp actuator respectively moves from the first actuator position toward the second actuator position;
• (d) a blade cooling system operatively coupled to the clamp actuator and selectively operable to discharge a fluid coolant onto the ultrasonic blade while the clamp actuator remains in the first actuator position, comprising:
• (i) a fluid reservoir configured to store fluid coolant;
• and
• (ii) a compressible fluid bladder configured to receive fluid coolant from the fluid reservoir via a first fluid passageway, and wherein the fluid bladder is selectively operable to discharge the fluid coolant onto the ultrasonic blade via a second fluid passageway.