Moisture filter

Abstract

The invention provides a moisture filter capable of effectively removing impurities such as moisture, secretion, bacteria, etc. contained in an expired gas sample. The moisture filter comprises an inner container, an outer sleeve and a connection structure; the inner container is internally provided with an air passage penetrating through the inner container in the vertical direction; the inner container further comprises a cavity for containing hydrophilic materials and hydrophilic materials contained in the cavity; the outer side wall of the inner container is hermetically coated by a moisture permeable film, wherein the wall of the cavity is further provided with an opening, through which the hydrophilic materials in the cavity are communicated with the moisture permeable film; the front end of the outer sleeve is hermetically fixed with a base plate provided with a plurality of vent holes; the rear end of the outer sleeve is configured into an open end; after the inner container is inserted into the cavity in the outer sleeve from the open end of the outer sleeve, a filter film capable of covering the front end face of the inner container and isolating the front end face of the inner container from the back surface of the base plate is fixed between the front end face of the inner container and the back surface of the base plate; the moisture permeable film is a film which does not allow air to pass through but allows moisture to pass through, and the filter film is a film which does not allow moisture to pass through but allows air to pass through; with the adoption of the moisture filter, the service life of a gas analyzer is prolonged and the health of patients is guaranteed simultaneously.

Description

technical field [0001] The invention relates to a medical exhaled gas filtering device, in particular to a water vapor filter for filtering out impurities such as water vapor, secretions and bacteria in breathing, and only allowing dry breathing gas to pass through. Background technique [0002] In medical practice, the gas analyzer is used to test and analyze the gas exhaled by the patient to detect the condition of the patient's respiratory tract, and to alarm if necessary. However, the gas samples exhaled by patients usually contain harmful impurities such as water vapor, secretions and bacteria. If water vapor, secretions and bacteria and other moisture-containing impurities enter the gas analyzer, the gas circuit system of the gas analyzer will be damaged for a long time. Moisture-containing impurities such as water vapor, secretions and bacteria also lead to a humid environment in the gas system, providing conditions for the growth of bacteria, resulting in the enrichm...

AI Technical Summary

Problems solved by technology

Moisture-containing impurities such as water vapor, secretions and bacteria also lead to a humid environment in the gas system, providing conditions for the growth of bacteria, resulting in the enrichment of bacteria in the gas system, shortening the service life of the gas analyzer, and endangering the patient's body healthy

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