Patent ID: 8221313

Claim:
An endoscope apparatus, comprising: an endoscope insertion unit to be inserted into a body; a first pipe path, provided in the endoscope insertion unit, for passing an endoscope treating tool; a second pipe path, provided in the endoscope insertion unit, for supplying gas and a liquid in a tank to the body; a first gas supply device capable of supplying gas at a predetermined pressure or a predetermined flow rate; a second gas supply device capable of supplying gas at an optional pressure or an optional flow rate; a switch unit, provided between the first pipe path and the second pipe path, and between the first gas supply device and the second gas supply device, for switching supply of gas from one of the first gas supply device and the second gas supply device to one of the first pipe path and the second pipe path; a selection device selecting one of the first gas supply device and the second gas supply device, and selecting one of the first pipe path and the second pipe path; and a control unit controlling the switch unit depending on output from the selection device, wherein the switch unit comprises: a first electromagnetic valve, connected to the first gas supply device, for turning on and off supply of gas from the first gas supply device; a second electromagnetic valve, connected to the second gas supply device, for turning on and off supply of gas from the second gas supply device; a third electromagnetic valve, provided between the first pipe path, and the first electromagnetic valve and the second electromagnetic valve, for turning on and off supply of gas to the first pipe path; and a fourth electromagnetic valve, provided between the second pipe path, and the first electromagnetic valve and the second electromagnetic valve, for turning on and off supply of gas to the second pipe path, and the control unit turns on and off supply of gas using the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, and the fourth electromagnetic valve.