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Method of expiration control

A control method and technology of exhalation valve, applied in the direction of respirator, etc., to achieve the effect of reducing exhalation work, increasing comfort, and reducing exhalation resistance

Inactive Publication Date: 2014-08-06
BEIJING AEONMED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this program does not involve an optimized control method for reducing expiratory resistance and intelligently controlling the patient's breathing

Method used

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Experimental program
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Embodiment Construction

[0023] system modeling

[0024] Such as figure 1 As shown, the system model of the exhalation phase of the ventilator is a first-order system of R and C.

[0025] Such as figure 2 As shown, in the relationship curve between expiratory flow and time, the waveform of the first half period represents the flow waveform of the inspiratory phase, and the waveform of the second half period represents the flow waveform of the expiratory phase.

[0026] Such as image 3 As shown, in the relationship curve between expiratory pressure and time, the waveform of the first half period represents the pressure waveform of the inspiratory phase, and the waveform of the second half period represents the pressure waveform of the expiratory phase.

[0027] Calculate the expiratory time constant τ:

[0028] τ=R×C=Vt / peak flow Formula 1

[0029] The expiratory time constant is in seconds or milliseconds.

[0030] Among them, Vt is the tidal volume, the unit is mL, which is the sum of the v...

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PUM

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Abstract

The invention provides a method of expiration control, which is used to control an expiratory valve containing a bilateral drive circuit. The method comprises the following steps: firstly, cutting off the expiratory valve before the expiration starts; secondly, opening the expiratory valve to maximum after the expiration starts; thirdly, determining the expiration time according to the sample signal; fourthly, closing the expiratory valve to a preset degree according to a certain curve linear relationship during the expiration time; and fifthly, returning to step 1.

Description

technical field [0001] The invention relates to an exhalation control method, in particular to an exhalation control method for controlling an exhalation valve with a bidirectional drive circuit. Background technique [0002] In the design of pneumatic and electronically controlled ventilators, the control of the exhalation valve is the key to achieving mechanical ventilation, especially for new ventilators with active exhalation valves, the reduction of exhalation resistance has been taken as one of the implementation goals of exhalation control . [0003] Common ventilator exhalation valve methods in the exhalation phase are: [0004] One: Single pressure control, that is, set a fixed single exhalation valve control signal after entering the expiratory phase, so that the output of the exhalation valve in the entire expiratory phase is PEEP (positive end-expiratory pressure). This solution will generate corresponding expiratory resistance throughout the exhalation phase, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61M16/00
Inventor 李敬辉刘冬高祥
Owner BEIJING AEONMED