SURGERY ASSISTANCE DEVICE

A suitable power backup configuration is constructed by a small battery in a surgery assistance device. For this purpose, the surgery assistance device includes a power supply unit configured to output a predetermined power supply voltage by using an external power supply, a backup power supply unit configured to output a predetermined power supply voltage by using a battery, a first power supply voltage path configured to supply the power supply voltage of the power supply unit to a plurality of load units, a manual switch, and a second power supply voltage path configured to be capable of supplying the power supply voltage of the backup power supply unit to some of the load units among the plurality of load units when the manual switch is operated.