Medical ultrasonic knife, medical ultrasonic knife system and robot-assisted ultrasonic knife system

The utility model provides a medical ultrasonic knife, a medical ultrasonic knife system and a robot-assisted ultrasonic knife system, and belongs to the technical field of medical instruments. The medical ultrasonic knife comprises a knife head, the knife head is provided with a first end face and a cutting groove, the cutting groove penetrates through the first end face, and the cutting groove enables the first end face to form at least one annular cutting face. When the bone tissue is cut or crushed, the bone tissue corresponding to the position of the cutting groove is not in contact with the cutting surface, namely the bone tissue is not cut or crushed, but the bone tissue corresponding to the periphery of the cutting groove is in contact with the cutting surface so as to be cut or crushed, so that the cutting or crushing surface of the cutting surface on the bone tissue is relatively small; compared with the prior art, the medical ultrasonic knife can still cut or crush larger bone blocks, and meanwhile