Control system and method for implementing double horizontal pressures in air passage, breathing machine and anaesthetic machine

Abstract

The invention discloses a control method and control system for implementing double horizontal pressures in an air passage. The control method comprises the following steps of: enabling the air inlet end of the air passage to be in a cut-off state or conducting state; enabling the air outlet end of the air passage to be in a cut-off state or conducting state with the external atmosphere by means of an expiratory valve; communicating a control air channel at the control end of the expiratory valve with an air supply source, and keeping the control air channel in a throttling state or full-conducting state, wherein the low-level pressure of the air passage can be set by regulating the throttling quantity of the control air channel in the throttling state; and controlling the state of the air inlet end of the air passage and the state of the control air channel of the expiratory valve in accordance with breath settings and the detected pressure of the air passage. The invention also discloses an anaesthetic machine and breathing machine with the control system. By using the method and system, the invention can completely achieve the functions which can be realized by adopting a proportional valve, an electronic PEEP (Positive End Expiratory Pressure) valve and closed-loop control, and has the advantages of simple design and low cost.

Description

technical field [0001] The present invention relates to a mechanical ventilation method with the goal of controlling pressure, especially a control system and method for realizing bilevel pressure in the airway. equipment. Background technique [0002] The bilevel positive airway pressure ventilation used in common medical equipment is generally realized by proportional valve plus electronic PEEP valve plus closed-loop control. [0003] The dual-level pressure control in the airway is realized by controlling the proportional valve and the electronic PEEP valve through a single chip microcomputer (MCU, Single Chip Microcomputer). [0004] When the MCU finds that the control object is out of tolerance through the relevant pressure sensor, it will adjust the control object in real time through the closed-loop control to achieve the predetermined control target. However, the control process is complicated, the structure is complicated, and the cost is high, which is not conduc...

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However, the control process is complicated, the structure is compli

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