Wireless ultrasonic surgical instrument with collecting energy

The invention discloses a wireless ultrasonic surgical instrument capable of collecting energy. According to one aspect of the present embodiment, a wireless ultrasonic surgical instrument includes: an end effector capable of cutting or stapling tissue by directly contacting the tissue; a handpiece provided with at least one piezoelectric element so as to transmit vibrational energy to the end effector; a hand instrument provided with a control unit that controls the operation of the end effector and controls whether or not the power supply of the power supply device is to be added; a shaft assembly which is connected to the end effector, receives the vibrational energy from the handpiece, rotates the handpiece, converts a part of the vibrational energy based on the rotation into electricenergy, and collects the electric energy; and a battery which supplies power to the handpiece so that the handpiece transmits the vibration energy to the end effector and charges the electric energy transmitted from the shaft