CN109771756A - The method for adjusting anesthesia respirator Inspiratory rise time using control algolithm - Google Patents

Abstract

A method of anesthesia respirator Inspiratory rise time is adjusted using control algolithm, in control initial state, utilize R, C fast estimation technique estimates the R of patient, C value, during air-breathing starting, according to formula F=Δ P/ (E*Tramp+R), calculating F is mean flow rate in Inspiratory rise time, in inlet valve and outlet valve synergic adjustment system, the upper limit coutroi velocity being less than in setting inspiratory duration is set as, actual flow of the timing measuring and calculating feedback valve output stream speed in Inspiratory rise time, when Inspiratory rise time is in setting time, when valve exports flow velocity less than upper limit coutroi velocity F, valve output flow velocity is slowly promoted to upper limit coutroi velocity F.

Description

The method for adjusting anesthesia respirator Inspiratory rise time using control algolithm

Technical field

The invention belongs to Medical Devices manufacturing technology fields, provide a kind of anesthesia respirator Inspiratory rise time adjusting side Method.

Background technique

In Anesthesia machine and ventilator control, when being cooperated using suction control valve and exhalation control valve, due to air-breathing Rise time is fixed, it is difficult to the effective adjusting for realizing Inspiratory rise time.

Currently, on Anesthesia machine and ventilator there are mainly two types of the modes of adjusting Inspiratory rise time:

1, gas feed flow rate is adjusted using mechanical structure, realizes that Inspiratory rise time is adjusted.The advantages of this method is to control Mechanism is simple, and pressure slope control can be easily realized.The disadvantage is that the method mechanical part degree of regulation is poor, it cannot be fine Guarantee the rise time precision；

2, flow control threshold velocity is adjusted using control algolithm, to guarantee that Inspiratory rise time is adjusted.This method it is excellent Point is to realize that hardware cost is low by the method for software using valve-gating technology.The disadvantage is that such method requires feedback control Period processed is very fast, and common microprocessor can not be completed well, be easy to appear pressure of inspiration(Pi) overshoot it is excessive, lead to air pressure Wound, and Inspiratory rise time control precision is not high, is restrained by feedback control.

Summary of the invention

It is an object of the invention to be directed to lead to the software adjustment rise time not because hardware resource is limited in the prior art Good problem proposes a kind of method for adjusting anesthesia respirator Inspiratory rise time using control algolithm, utilizes estimation R, C value meter Flow needed for calculating Inspiratory rise time guarantees the precision of Inspiratory rise time, eliminates the overshoot occurred when pressure of inspiration(Pi) is adjusted existing As.

Technical scheme is as follows:

A method of anesthesia respirator Inspiratory rise time is adjusted using control algolithm, it is characterised in that:

Step 1: in the case where control initial state does not monitor patient's R, C value correctly, according to the 50% of setting pressure The ventilation of carrying out a test property, estimates R, C value of patient using R, C fast estimation technique during this period；

Step 2: during air-breathing starting, according to formula F=Δ P/ (E*Tramp+R), when calculating setting air-breathing rising Flow needed for interior, wherein F is mean flow rate in Inspiratory rise time, and E is conductance, and Tramp is Inspiratory rise time, and R is gas Resistance, E=1/C, C are compliance；

Step 3: the upper limit coutroi velocity being less than in setting inspiratory duration is set as F；Timing measuring and calculating feedback valve output Actual flow of the flow velocity in Inspiratory rise time, when Inspiratory rise time is in setting time, the valve monitored is exported It, will before monitoring Inspiratory rise time reaches the 20% of Inspiratory rise time setting value when flow velocity is less than upper limit coutroi velocity F Flow is slowly promoted to upper limit coutroi velocity F；Monitoring Inspiratory rise time be more than Inspiratory rise time setting value 20% with Afterwards, constant current ventilation is carried out by upper limit coutroi velocity F；

Step 4: after Inspiratory rise time is more than the set rise time, removing inlet valve and outlet valve synergic adjustment system Maximum flow rate control limitation, switchs to inlet valve and outlet valve collaboration pressure is adjusted.

The present invention counts the Inspiratory rise time under pressure control using the classical formulas in pneumodynamics principle It calculates, according to calculated control flow, adjusts flow control valve and exported according to certain mode, to realize Inspiratory rise time Adjusting, solve the problems, such as to cause the software adjustment rise time bad because hardware resource is limited in the prior art, realize It is used under flow control valve mode in Anesthesia machine and the control of ventilator pressure, using software to the accurate tune of Inspiratory rise time Section.

Specific embodiment

It is of the invention that the specific implementation steps are as follows:

Step 1, control initial state do not monitor patient's R, C value correctly in the case where, according to setting pressure 50% The ventilation of carrying out a test property estimates R, C value of patient with R, C fast estimation technique during this period, and R is vapour lock, and C is to comply with Property；

Step 2, during air-breathing starting, according to formula F=Δ P/ (E*Tramp+R), when calculating setting air-breathing and rising Flow needed for interior, wherein F is mean flow rate in Inspiratory rise time, and E is conductance, and Tramp is Inspiratory rise time, and R is gas Resistance, E=1/C, C are compliance；

The upper limit coutroi velocity being less than in setting inspiratory duration is set as F by step 3；Timing measuring and calculating feedback valve output stream Actual flow of the speed in Inspiratory rise time.For example: it is arranged in the time when Inspiratory rise time is in, the valve monitored It when door output flow velocity is less than upper limit coutroi velocity F, is opened by control valve, valve output flow velocity is slowly promoted to upper limit control Flow rate F processed, concrete mode are as follows:

Before monitoring Inspiratory rise time reaches the 20% of Inspiratory rise time setting value, upper limit coutroi velocity F is adopted With slow method for improving, flow is slowly promoted to upper limit coutroi velocity F, such as: reach the 5% of setting time in the rise time When, air-breathing coutroi velocity is set as the 25% of upper limit coutroi velocity F, when the rise time reaching the 10% of setting time, will be inhaled Gas coutroi velocity is set as the 50% of upper limit coutroi velocity F, when the rise time being more than or equal to the 20% of setting time, by air-breathing control Flow velocity processed is set as upper limit coutroi velocity F；

Monitoring Inspiratory rise time be more than Inspiratory rise time setting value 20% after, by upper limit coutroi velocity F into Valve positioner is exported control flow and is adjusted to upper limit coutroi velocity F, according to upper limit coutroi velocity F to valve by row constant current ventilation Carry out flow velocity PID control；

Step 4 is being more than removal inlet valve and the control of the outlet valve synergic adjustment system flow rate upper limit after the set rise time Limitation, switchs to inlet valve and outlet valve collaboration pressure is adjusted.After reaching the set rise time, pressure ordinary circumstance can compare at this time It is small by 10% or so to set pressure, controller maximum flow rate is controlled into limitation removal at this time, is controlled using pressure and mentions residual compression It is raised to set pressure, due to little from set pressure differential value at this time, it is only necessary to supplying a lesser flow just can reach, therefore not It will appear pressure overshoot.

Claims (1)

1. a kind of method for adjusting anesthesia respirator Inspiratory rise time using control algolithm, it is characterised in that:

Step 1: in the case where control initial state does not monitor patient's R, C value correctly, being carried out according to the 50% of setting pressure Primary tentative ventilation, estimates R, C value of patient using R, C fast estimation technique during this period；

Step 2: during air-breathing starting, according to formula F=Δ P/ (E*Tramp+R), calculating in setting Inspiratory rise time Required flow, wherein F is mean flow rate in Inspiratory rise time, and E is conductance, and Tramp is Inspiratory rise time, and R is vapour lock, E =1/C, C are compliance；

Step 3: the upper limit coutroi velocity being less than in setting inspiratory duration is set as F；Timing measuring and calculating feedback valve output stream speed Actual flow in Inspiratory rise time, when Inspiratory rise time is in setting time, the valve monitored exports flow velocity When less than upper limit coutroi velocity F, before monitoring Inspiratory rise time reaches the 20% of Inspiratory rise time setting value, by flow It is slowly promoted and arrives upper limit coutroi velocity F；After 20% of monitoring Inspiratory rise time more than Inspiratory rise time setting value, press Upper limit coutroi velocity F carries out constant current ventilation；

Step 4: after Inspiratory rise time is more than the set rise time, removing inlet valve and outlet valve synergic adjustment system flow rate Upper limit control limitation, switchs to inlet valve and outlet valve collaboration pressure is adjusted.