Expiratory valve system

Abstract

The invention provides an exhalation valve system, which is mainly used as the exhalation valve system for a respirator, etc. The exhalation valve system of the invention comprises an exhalation valve and an electrically controlled regulation device, wherein, the exhalation valve comprises a valve body (1), a valve core (2) and a valve cover (4); the electrically controlled regulation device comprises: a shell body (11) which is communicated with the valve body (1), an elastic part (10) which blocks off the shell body (11) in the airtight mode, an electromagnet (7) which is fixedly connected with the shell body (11), and a push rod (8) which is fixedly connected with the electromagnet (7). The exhalation valve system adopts the mode driven by electromagnet (7) and changes the internal gas pressure of the valve core (2) by changing the volume of an inner cavity (11c) of the shell body (11), thus achieving the purpose of controlling the valve core (2) to be opened / closed; the exhalation valve system does not need an additional gas source, the universality is good, the control sensitivity is good, the cost is lower, and the detachment and the installation are convenient for cleaning and disinfection.

Description

technical field [0001] The present invention relates to the field of medical devices, in particular to exhalation valve systems such as those used in ventilators. Background technique [0002] In various assisted breathing devices (such as ventilators), it is necessary to set an exhalation valve to control the exhalation of the patient. The structure of the exhalation valve currently used is similar to the overflow valve, which can completely close the pressure keeping, or completely Open to vent to zero relative pressure (eg, atmospheric pressure). The safety overflow pressure of the exhalation valve (that is, the opening pressure of the exhalation valve spool) should be continuously adjustable, and most of the adjustment control methods are electrical automatic control. At present, the following two methods are mainly used to control the opening of the exhalation valve spool Pressure: One is to use the proportional electromagnet to directly act on the exhalation valve cor...

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Problems solved by technology

[0003] However, there are corresponding shortcomings in the above two adjustment methods: on the one hand, since the exhalation valve needs to be frequently disassembled for cleaning and disinfection, the adjustment method using electromagnets and force transmission mechanisms requires the processing of various force transmission components. The precision is very high, and the assembly precision in the later stage should also be high, so as to ensure that the exhalation valve has sufficient control precision and sensitivity, and its reliability will vary from operator to operator; on the other hand, the adjustment method using compressed air requires Continuous air supply, which greatly limits its scope of application (that is, it can only be used on devices that can provide continuous air supply, and it cannot be used if the electric ventilator is used)

In addition, the implementation costs of the above two control methods are relatively high

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