Gas-liquid switching valve and endoscope

Abstract

The invention provides a gas-liquid switching valve and an endoscope, which can prevent liquid from flowing out of the switching valve and help to improve its safety performance. The gas-liquid switching valve includes a valve body, a valve core assembly and a liquid-proof and gas-permeable part. The valve core assembly is movably arranged in the valve cavity, and the valve core assembly is provided with a communication channel for communicating with the external environment. When the spool assembly is moved to the first position, the liquid path between the liquid inlet and the gas-liquid outlet is blocked, the gas path between the gas inlet and the gas-liquid outlet is dredged, and the communication channel is blocked at this time To make the gas-liquid switching valve in the gas supply state. When the spool assembly is moved to the second position, the passage between the air inlet and the gas-liquid outlet is blocked, and the liquid path between the liquid inlet and the gas-liquid outlet is dredged, so that the The gas-liquid switching valve is in the liquid supply state. The liquid-proof and gas-permeable part is arranged in the communication channel, and is used for preventing liquid from passing through the communication channel and allowing gas to pass through the communication channel.

Description

technical field [0001] The present application relates to the technical field of endoscopes, and in particular, to a gas-liquid switching valve and an endoscope. Background technique [0002] In the medical and industrial fields, endoscopes with elongated insertion parts that can be inserted into body cavities or pipelines are widely used, which are usually provided with devices for supplying air and liquid, and can send water into the body cavity or pipeline as needed , liquid medicine or air, etc. [0003] At present, the gas supply / liquid supply of the endoscope is controlled by the gas-liquid switching valve provided in the endoscope operation part to control the gas supply or liquid supply, and in order to realize the gas supply, liquid supply and neither gas supply nor liquid supply of the endoscope The three states of the liquid are switched. The natural state of the switching valve used in the existing endoscope is usually that the gas channel is connected to the ou...

AI Technical Summary

Problems solved by technology

[0005] However, when pressing the top of the switching valve to switch the endoscope to the liquid supply state, the moment the liquid channel is opened, liquid may rush into the through hole at the top of the switching valve, and then flow out from the through hole, This will not only wet or pollute the surface of the switching valve, affect the circuit board or other electrical parts in the operating part, thereby affecting the normal use of the endoscope, but once the flushed liquid contacts the external environment (such as the user's fingers, etc.) and then flow back into the gas channel of the switch valve, when the endoscope is switched to the gas supply state, these contaminated return liquids will be sent into the body cavity, which is likely to cause infection and affect the safety of the endoscope bring great challenges

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