CN103330983A - Test lung with characteristics of high frequency response and high precision control - Google Patents

Abstract

The invention belongs to the technical field of medical instruments, and achieves a test lung with characteristics of high frequency response and high precision control. The content mainly relates to the method that output pressure and a flow are controlled through multiple pathways, and therefore breath precision and frequency response of patient simulation are improved. The test lung is different from a traditional test lung, and through the addition of flow compensation control, by the adoption of the double control over air tank and the flow compensation, the breath precision of the patient simulating is improved. Through the addition of the flow compensation control, by the adoption of the air tank control and the flow compensation control, the breath precision and response speed of the patient simulating are improved, and therefore the test lung is significant in precise detection of functions of a breathing machine and precise parameter adjustment and has excellent popularizing prospects.

Description

A kind of test lung with high frequency response, high accuracy control characteristic

Technical field

The invention belongs to technical field of medical instruments, relate to a kind of test lung of high accuracy control.

Background technology

What test lung was to use respirator must spares, is used for detecting the respirator function and regulates parameter.At present common test lung is mainly come simulated respiration by pressure and the flow of the output of control source of the gas.Because there is serious lag in source of the gas, can't realize corresponding fast when respiratory characteristic changes.

At this situation, a kind of test lung with high frequency response, high accuracy control characteristic that the present invention proposes is passed through to increase flow-compensated, adopt source of the gas output and flow-compensated dual control, improve precision and frequency response that the modal patient breathes, have the excellent popularization prospect.

Summary of the invention

The objective of the invention is: a kind of test lung with high frequency response, high accuracy control characteristic is provided.

Technical scheme of the present invention is: test lung is made up of controller, button assembly, display screen, compressed air source unit, gas tank (1), flow proportion valve (2), flow transducer (3), pressure transducer (4); According to pressure and the flow of expection delivery air, control compressed air source unit and flow proportion valve (2) automatically, realize the dual control of output pressure and flow, improve precision and response speed that the modal patient breathes.The controller of test lung is measured pressure and the flow of delivery air by pressure transducer (4) and flow transducer (3), pressure and flow with the expection delivery air are that target is determined control strategy, the duty of control compressed air source unit and the aperture size of flow proportion valve (2) realize corresponding, the accurate control fast of test lung output pressure and flow.

Advantage of the present invention is: compare with traditional test lung, the present invention has increased flow-compensated, according to the feedback data of pressure and flow transducer, realizes compressed air source unit and flow-compensated dual control, can be fast, accurately the modal patient breathes dynamic characteristic, has the excellent popularization prospect.

Description of drawings

Fig. 1 is the structure diagram of test lung of the present invention.

1---gas tank; 2---flow proportion valve; 3---flow transducer;

4---pressure transducer;

The specific embodiment

Below the present invention is further illustrated.

Flow transducer and pressure transducer detect and the feedback simulation is exported flow and pressure, dynamic characteristic according to compressed air source unit and flow proportion valve, by the dual control to compressed air source unit and flow proportion valve, realize high frequency response, the high accuracy control of output flow and pressure.

Gas is very complicated thermodynamic process by the process of flow proportional control valve restriction, can calculate with the mass flow of contracting noz(zle) by the mass flow of restriction, works as p _l/ p _h0.528 o'clock, gas flow is subsonic speed, is called subsonic flow; Work as p _l/ p _h≤ 0.528 o'clock, gas flow was velocity of sound, was called velocity of sound and flowed.The flow equation expression formula that calculates the flow control valve of flowing through by these two kinds of flow regimes is as follows:

In the formula,

$B=\sqrt{\frac{2\mathrm{\κ}}{R(\mathrm{\κ}-1)}}$

$N={\left(\frac{2}{\mathrm{\κ}+1}\right)}^{\frac{1}{\mathrm{\κ}-1}}\sqrt{\frac{2\mathrm{\κ}}{R(\mathrm{\κ}+1)}}$

Wherein: A _e: net sectional area in the intake and exhaust pipeline system; P _h: the pressure of restriction upstream; P _l: the pressure in restriction downstream; κ: constant entropy coefficient; R: ideal gas constant.

Claims (2)

1. the test lung with high frequency response, high accuracy control characteristic is characterized in that: be made up of controller, button assembly, display screen, compressed air source unit, gas tank (1), flow proportion valve (2), flow transducer (3), pressure transducer (4); This test lung is controlled compressed air source unit and flow proportion valve (2) automatically according to pressure and the flow of expection delivery air, realizes the dual control of output pressure and flow, improves precision and response speed that the modal patient breathes.

2. a kind of test lung with high frequency response, high accuracy control characteristic according to claim 1, it is characterized in that: the controller of test lung is measured pressure and the flow of delivery air by pressure transducer (4) and flow transducer (3), pressure and flow with the expection delivery air are that target is determined control strategy, the duty of control compressed air source unit and the aperture size of flow proportion valve (2) realize corresponding, the accurate control fast of test lung output pressure and flow.

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