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Leakage compensation method for single-loop non-invasive ventilators

A compensation method and ventilator technology, applied in the direction of ventilator, etc., can solve the problem of inaccurate air leakage compensation.

Inactive Publication Date: 2013-05-01
BEIJING AEROSPACE CHANGFENG CO LTD
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Problems solved by technology

[0003] In order to solve the problem that the leakage compensation amount of single-circuit non-invasive ventilator in China is not accurate enough, a single-circuit non-invasive ventilator air leakage compensation method is provided, which is used for accurate estimation of single-circuit non-invasive ventilator air leakage, and realizes pressure and moisture adjustment. Accurate control of the volume, and corresponding compensation when feeding the patient

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Embodiment Construction

[0012] like figure 1 As shown, the present invention first determines the leakage flow rate by the following method:

[0013] 1. Obtain the two-dimensional curve of the gas pressure difference before and after the leaking tooling and the average leaking flow rate through automatic calibration:

[0014] Connect the air leakage tooling, calculate the gas pressure at the front end of the air leakage tooling and the gas pressure difference after passing through the air leakage tooling, and monitor the calculation of the tidal volume entering the active lung when the air leakage tooling is not connected and when the air leakage tooling is connected respectively Calculate the average leakage flow rate, obtain a two-dimensional curve between the pressure difference before and after the leakage device and the average leakage flow rate, and store the curve in the readable and writable memory of the controller;

[0015] 2. Calculate the actual leak flow rate when the patient is actuall...

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Abstract

The invention relates to a leakage compensation method for single-loop non-invasive ventilators. The leakage compensation method is characterized in that the leakage compensation method includes the following steps: (1) a two-dimensional curve of the difference between the oxygen pressure at the front of a leaking tooling and the oxygen pressure at the rear of the leaking tooling and average leakage flow velocity is obtained by automatic calibration; (2) when a patient is ventilated in practice, actual leakage flow velocity is calculated; (3) implementation of leakage pressure compensation by the PID (Proportion Integration Differentiation) control algorithm: according to the obtained actual leakage flow velocity, the rotational speed of a turbofan is regulated, moreover, the turbofan and a pressure sensor are utilized to compose a PID control system, and by monitoring the difference between actual airway pressure and set pressure and feeding back and regulating PID parameters, the rotational speed of the turbofan is rapidly controlled until the set pressure value is reached.

Description

technical field [0001] The invention relates to a method for compensating air leakage of a single-circuit non-invasive ventilator, which is used to accurately estimate the air leakage of a single-circuit non-invasive ventilator, and provide corresponding compensation when supplying air to a patient, so as to ensure that the patient obtains the required air leakage. It belongs to the technical field of medical equipment manufacturing. Background technique [0002] In the non-invasive ventilation mode, since part of the gas breathed by the patient leaks from the gap between the mask and the mouth and nose, the actual amount of gas inhaled and exhaled by the patient is different from the actual flow rate provided and measured by the ventilator. Estimate the air leakage status of the patient, and give a certain amount of allowance to compensate for the air supply, so as to ensure that the patient gets the required ventilation. The air leakage of the existing double-circuit non-...

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Application Information

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IPC IPC(8): A61M16/00
Inventor 魏瑞丽
Owner BEIJING AEROSPACE CHANGFENG CO LTD
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