Patent ID: 9615724
Date: 2017-04-11
CPC Classifications: A61B

Claim:
1. A fluid control apparatus for an endoscope, the fluid control apparatus being provided in an endoscope and switching between supply of a gas to and suction of a fluid from an inside of a subject, the fluid control apparatus comprising: a gas feeding duct that communicates with one endoscope duct provided in the endoscope, and feeds the gas to the inside of the subject; a suction duct that is communicable with the endoscope duct, and sucks the fluid in the subject, jointly with the endoscope duct, after the suction duct is brought into communication with the endoscope duct; a first valve that is installed at a position partway through a flow passage of the gas feeding duct, the first valve opening the flow passage by a feeding pressure of the gas only when gas feeding is underway and closing the flow passage when no gas feeding is underway to thereby prevent reverse flow of the fluid in the gas feeding duct to a part on an upstream side of the flow passage of the gas feeding duct when no gas feeding is underway; and a second valve that is installed at a position partway through the flow passage of the gas feeding duct, the position being on the upstream side relative to the first valve, the second valve always opening the flow passage when gas feeding is underway and closing the flow passage at least when suction is underway in a state where the suction duct communicates with the endoscope duct, and the second valve being configured to automatically close the flow passage in a case where the first valve opens the flow passage as a result of a pressure decrease in parts of the gas feeding duct and the endoscope duct on a downstream side relative to the first valve, the second valve automatically closing the flow passage as a result of the pressure decrease to thereby prevent reverse flow of the fluid to the upstream side relative to a position at which the flow passage is closed when no gas feeding is underway in a state where the gas feeding duct does not communicate with the endoscope duct and no gas suctioning is underway in a state where the suction duct does not communicate with the endoscope duct, wherein the second valve is configured by a depressible button.