FLUID CONTROL APPARATUS FOR ENDOSCOPE

摘要

A gas feeding duct, a suction duct, a first valve that is installed in the gas feeding duct and opens a flow passage only when gas feeding is underway, and a second valve that is installed in a part of the flow passage on an upstream side relative to the first valve, and opens the flow passage K along with gas feeding and closes the flow passage at least when suction is underway are included, and when neither gas feeding nor gas suctioning is underway, the second valve closes the flow passage in conjunction with the first valve unexpectedly opening the flow passage as a result of pressure variation in a part of the gas feeding duct on a downstream side relative to the first valve and thereby prevents reverse flow of a fluid to the upstream side relative to the second valve.

主权项

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, and opens the flow passage only when gas feeding is underway and thereby prevents 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, and opens the flow passage along with gas feeding and closes the flow passage at least when suction is underway, and when neither gas feeding nor gas suctioning is underway, closes the flow passage in conjunction with the first valve unexpectedly opening the flow passage as a result of pressure variation in parts of the gas feeding duct and the endoscope duct on a downstream side relative to the first valve, and thereby prevents reverse flow of the fluid to the upstream side relative to a position at which the flow passage is closed.