Coupling for slip ring assembly and ultrasonic transducer in surgical instrument

A surgical instrument comprising:

• (a) a handle assembly;
• (b) an acoustic transmission assembly comprising:
• i. a shaft extending distally from the handle assembly, and
• ii. an end effector coupled to a distal end of the shaft, wherein the end effector includes a harmonic blade;
• and
• (c) a transducer in acoustic communication with the end effector;
• (d) a mounting ring rotatably coupling the transducer with the handle assembly, the mounting ring having one or more channels disposed in the mounting ring, wherein the transducer has one or more piezoelectric components disposed proximally of the mounting ring;
• (e) a drum disposed distally of the mounting ring;
• and
• (f) one or more electrical conduits coupling the drum with the piezoelectric components, wherein the electrical conduits are disposed within and routed through the one or more channels in mounting ring.

A surgical instrument comprising:

• (a) a handle assembly;
• (b) an acoustic transmission assembly comprising:
• i. a shaft extending distally from the handle assembly, and
• ii. an end effector coupled to a distal end of the shaft, wherein the end effector includes a harmonic blade;
• and
• (c) a transducer in acoustic communication with the end effector;
• (d) a mounting ring rotatably coupling the transducer with the handle assembly, the mounting ring having one or more channels disposed in the mounting ring, wherein the transducer has one or more piezoelectric components disposed proximally of the mounting ring;
• (e) a drum disposed distally of the mounting ring;
• and
• (f) one or more electrical conduits coupling the drum with the piezoelectric components, wherein the electrical conduits are routed over or through the mounting ring,
• wherein the drum, the mounting ring, and the transducer comprise a unitarily rotatable assembly that is rotatable relative to the handle assembly.