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Universal algorithm for monitoring R value and C value of anesthesia respirator

A general algorithm and C-value technology, applied in computer-aided medical procedures, medical equipment, medical automation diagnosis, etc., can solve problems such as low accuracy, inability to apply a variety of ventilation algorithms, and large limitations, and achieve high estimation accuracy. Effect

Inactive Publication Date: 2019-05-21
BEIJING AEROSPACE CHANGFENG CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

R and C values ​​can be calculated by this method, but the accuracy is not high, and it can only be calculated in the VCV control mode with breath-hold function, which has great limitations and cannot be applied to various ventilation algorithms

Method used

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Embodiment Construction

[0011] The present invention comprises the steps:

[0012] Step 1: During the inspiratory phase of each respiratory cycle of the patient, collect the values ​​of the gas supply volume V, pressure P, and flow rate F in real time at regular time intervals, and transmit the collected data to the controller CPU;

[0013] Step 2: According to the values ​​of volume V(t), pressure P(t) and flow velocity F(t) collected at a certain time t, and the volume V(t+1) and pressure P( t+1), the value of flow velocity F(t+1), the approximate R value C value is calculated by the controller CPU, and the calculation method is as follows:

[0014] R=(V(t)*P(t+1)-V(t+1)*P(t)) / (F(t+1)*V(t)-F(t)*V(t+ 1));

[0015] C=(V(t+1)*F(t)-V(t)*F(t+1)) / (F(t)*P(t+1)-F(t+1)*P( t));

[0016] The above calculation method is derived as follows:

[0017] Transform the known formula for calculating the pressure at time t: P(t)=E*V(t)+R*dv / dt, where P(t) is the pressure value at time t, V(t) is the capacity at ti...

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Abstract

The invention provides a universal algorithm for monitoring the R value and the C value of an anesthesia respirator. During the inspiration stage of each respiration period of a patient, the values ofan air supply capacity V, a pressure P and a flow velocity F at the current moment are collected in real time at certain time intervals. The collected data are transmitted to a controller CPU. According to the values of the capacity V (t), the pressure P(t) and the flow rate F(t) collected at a certain moment t, the values of the capacity V (t+1), the pressure P(t+1) and the flow rate F(t+1) collected at a next moment (t+1), an approximate R value and an approximate C value are calculated through the controller CPU. The calculated R value and the calculated C value are transmitted to a Kalmanestimation controller for estimation purpose. The obtained estimation result is stored into a storage unit in the controller in a classified manner according to numerical values. After the inspiration stage of the respiration period is finished, the normal distribution is solved for a plurality of stored R value samples and C value samples. The average values of R values and C values with the widest normal distribution are respectively calculated to serve as an R value result and a C value result.

Description

technical field [0001] The invention is used in anesthesia machines and ventilators to quickly monitor the parameters of airway dynamic air resistance (R value) and lung dynamic compliance (C value) of patients, and belongs to the technical field of medical equipment manufacturing. Background technique [0002] In the control of anesthesia machine and ventilator, it is necessary to monitor the patient's various signs. By correctly monitoring the patient's airway air resistance (R value) and patient lung compliance (C value), the anesthesia machine and the anesthesia machine can be effectively adjusted and controlled. The ventilator ventilation method is suitable for various situations under different signs, and reduces the complications caused by patients using anesthesia machines and ventilators. Usually, air resistance is calculated by monitoring peak inspiratory pressure Ppeak, airway plateau pressure Pplat, and peak flow velocity ΔF, using the formula R=ΔP / ΔF, where ΔP=P...

Claims

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Application Information

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IPC IPC(8): G16H40/63G16H50/20
Inventor 刁俊
Owner BEIJING AEROSPACE CHANGFENG CO LTD