Adapter and surgical assistance system

An adapter comprising:

• an installation platform and an instrument driving device provided on the installation platform, the installation platform being installed on a surgery performing device;
• wherein the instrument driving device is in transmission connection with the surgery performing device and is configured to drive a surgical instrument;
• the installation platform comprises a counting rack, a platform body and an installation bottom plate, wherein the platform body is in transmission connection with a power output shaft of the surgery performing device via the installation bottom plate, and the counting rack is installed on the platform body and configured to limit a number of usage times of the adapter;
• and
• a transmission shaft, wherein a first end of the transmission shaft is in transmission connection with the power output shaft, and a second end of the transmission shaft is in transmission connection with the instrument driving device,
• wherein the transmission shaft is provided with locking tabs, the counting rack is provided in a horizontal plane in a preset direction, a first row of teeth is provided on a side of the counting rack adjacent to the transmission shaft, and the preset direction comprises an axial direction of the transmission shaft;
• and
• the locking tabs are configured to extend into a groove of the first row of teeth and push an edge of the groove when the transmission shaft rotates, so that the counting rack is moved by a first distance in the preset direction.