초록 ▼

A piston of an air and water supply valve in an endoscope comprises: a base cylinder; a water supply switching piston; and an air supply switching piston, which is inserted in the water supply switching piston. An air supply button functioning as a check valve is attached to the top end of the air s

A piston of an air and water supply valve in an endoscope comprises: a base cylinder; a water supply switching piston; and an air supply switching piston, which is inserted in the water supply switching piston. An air supply button functioning as a check valve is attached to the top end of the air supply switching piston, and air is supplied by slightly pressing the air supply button and water is supplied by deeply pressing the air supply button. If liquid flows back, the air supply button functions as the check valve to prevent the backflow from flowing into the base cylinder from the air supply switching piston.

대표청구항 ▼

1. An air and water supply valve structure provided at a manual operation part of an endoscope, comprising:a base cylinder that is a hollow cylinder connecting: to an air feed tube feeding air into the base cylinder, to a water feed tube feeding water into the base cylinder, to an air supply tube to

1. An air and water supply valve structure provided at a manual operation part of an endoscope, comprising:a base cylinder that is a hollow cylinder connecting: to an air feed tube feeding air into the base cylinder, to a water feed tube feeding water into the base cylinder, to an air supply tube to supply the air from the base cylinder to an air and water supply opening formed at an end of an insertion part of the endoscope, and to a water supply tube to supply the water from the base cylinder to the air and water supply opening; a first piston that is a hollow cylinder slidably inserted into the base cylinder, the first piston having a connection opening to connect the air feed tube and an inner space of the first piston, the first piston having a connection passage to connect the water feed tube and the water supply tube; a second piston that is a hollow cylinder arranged inside the first piston, an inner space of the second piston being connected to the air supply tube; a first operation member provided to the second piston, the first operation member being pressed by first and second steps, the first operation member connecting, when pressed by the first step, the inner space of the first piston and the inner space of the second piston, and the first operation member disconnecting, when not pressed, the inner space of the first piston and the inner space of the second piston; and a second operation member provided to the first piston, wherein when the first operation member is pressed by the second step, the second operation member is pressed and positions the first piston such that the connection opening of the first piston is disconnected from the air feed tube and that the connection passage of the first piston connects the water feed tube and the water supply tube.