Exhaled air collection system and method

Abstract

The invention discloses an exhaled air collection system and method. The exhaled air collection system comprises an air collection front end, an exhaled air collector, a carbon dioxide sensor unit, a speed-adjustable air pump, a three-way electromagnetic valve, an input / output unit and a main control unit; the exhaled air collector is used for collecting exhaled air collected by the air collection front end; the carbon dioxide sensor unit is used for testing the concentration of carbon dioxide in exhaled air; the speed-adjustable air pump can adjust the flow speed to control collection of expired air; the main control unit is used for setting a carbon dioxide threshold value according to the breathing rule of a subject and controlling the opening and closing of the three-way electromagnetic valve according to the carbon dioxide concentration tested in real time, so that expired air meeting the requirement of the carbon dioxide threshold value enters the expired air collector; and the air collecting flow of the speed-adjustable air pump can be set according to the input age and / or weight and / or other signs of the subject; and the exhaled air collection system is suitable for people of different ages and different physiques, the air collecting efficiency is improved, and an automatic air collecting method is truly feasible clinically.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a breath collection system and method. Background technique [0002] More and more people pay more and more attention to the diagnosis of diseases by detecting breath. Now there are many kinds of breath diagnostic instruments in clinic, such as red blood cell life breath tester for detecting red blood cell life, HP tester for detecting Helicobacter pylori, etc., breath The use of diagnostic instruments is inseparable from the collection of exhaled breath. At present, the exhaled breath collection methods used in clinically used exhaled breath diagnostic instruments are mainly active conscious exhalation, which is only suitable for those with active consciousness. People with a certain cognitive ability and active consciousness are not suitable for infants with low cognitive ability and adults with no active consciousness or cognitive impairment. Therefore, a device and method that ...

AI Technical Summary

Problems solved by technology

[0003] The invention with application number 201610147517.2 discloses a fully automatic exhalation collection device and method, but the method and device can only fix the flow rate, and for people of different ages, the expiratory volume is different, and the fixed flow rate will inevitably cause the method And devices can only be suitable for a specific group of people, thus resulting in limited beneficiaries

In addition, the exhaled breath collected by setting the air collection tube in the nasal cavity or oral cavity is not 100% alveolar gas, and more or less mixed with cavity air and outside air, but the information that is really beneficial to disease diagnosis is the various components of alveolar gas. How to accurately obtain the various concentration information of alveolar gas is a major problem in today's existing technology

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