Features for coupling surgical instrument shaft assembly with instrument body

An apparatus for operating on tissue, the apparatus comprising:

• (a) a body assembly;
• (b) an ultrasonic transducer operable to convert electrical power into ultrasonic vibrations;
• (c) a shaft assembly extending distally from the body assembly, wherein the shaft assembly comprises a waveguide operable to transmit ultrasonic vibrations;
• (d) a motor operable to rotate the ultrasonic transducer to thereby selectively couple the ultrasonic transducer with the waveguide;
• and
• (e) a locking feature configured to selectively linearly translate within the body assembly to thereby selectively prevent rotation of the shaft assembly relative to the body assembly.

An apparatus for operating on tissue, the apparatus comprising:

• (a) a body assembly;
• (b) a locking member, wherein the locking member is configured to translate within the body assembly through electrical power;
• (c) an ultrasonic transducer operable to convert electrical power into ultrasonic vibrations;
• (d) a shaft assembly extending distally from the body assembly, wherein the shaft assembly comprises a waveguide operable to transmit ultrasonic vibrations;
• and
• (e) a motor operable to rotate the ultrasonic transducer to thereby selectively couple the ultrasonic transducer with the waveguide;
• wherein the shaft assembly is configured to receive the locking member such that translation of the locking member within the body assembly prevents rotation of the shaft assembly relative to the body assembly.