Surgical instrument handpiece with resiliently biased coupling to modular shaft and end effector

A surgical instrument comprising:

• (a) a body assembly comprising:
• i. a housing defining a cavity having a distal cavity portion and a proximal cavity portion, wherein the proximal cavity portion is configured to receive an ultrasonic transducer, and
• ii. a resilient member, wherein at least a portion of the resilient member is positioned within the distal cavity portion and is configured to selectively move between an engagement position and a disengagement position;
• and
• (b) a transmission assembly comprising:
• i. a proximal shaft portion having a proximal end configured to receive the ultrasonic transducer extending proximally therefrom, wherein the proximal shaft portion is configured to be received within the distal cavity portion of the housing,
• ii. a coupling feature disposed at the proximal shaft portion,
• iii. a distal shaft assembly extending distally relative to the coupling feature, and
• iv. an end effector coupled to a distal end of the distal shaft assembly;
• wherein the resilient member is configured to selectively engage the coupling feature to mechanically secure at least a part of the transmission assembly to the body assembly in the engagement position, and the resilient member is further configured to selectively disengage from the coupling feature to mechanically release at least the part of the transmission assembly to the body assembly, and
• wherein the resilient member in the engagement position extends through the housing and engages the coupling feature such that each of the proximal end of the proximal shaft portion and the proximal cavity portion of the housing remain configured to receive the ultrasonic transducer for operating the surgical instrument.