A tidal volume curve measuring device and method for an artificial lung of an air breathing machine

Abstract

The application discloses a kind of artificial lung tidal volume curve measuring device and method for air breathing machine, including variable volume type pressure measuring device, support being arranged below variable volume type pressure measuring device and playing the supporting role, gas supply device being arranged in the side of variable volume type pressure measuring device, test head mould being arranged in the other side of variable volume type pressure measuring device and being used for conducting airflow, artificial lung being arranged below test head mould and being used for simulating human lung breathing, controller for driving motor and collecting data, display for visualizing acquisition result.Measuring personnel only need to record the pressure sensor value of variable volume type pressure measuring device before and after valve opening respectively.The application can accurately measure corrugated pipe type artificial lung tidal volume curve, realize motor accurate control tidal volume, can further guarantee the detection of positive pressure type air breathing machine, avoid the occurrence of fire-fighting personnel casualty event caused by positive pressure type air breathing machine misjudgment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fire-fighting equipment, and particularly relates to a tidal volume curve measuring device and method for an artificial lung of an air breathing machine. BACKGROUND

[0002] The air breathing machine is a protective product that must be carried by a firefighter during fire extinguishing and rescue, and plays an important guarantee role for the life safety of the firefighter, so the stability and reliability of the air breathing machine need to be checked regularly. The artificial lung control system through the simulation of human respiration realizes the performance test of the breathing machine, and has attracted extensive attention from the academic and industrial circles. However, due to the non-linear characteristics of the tidal volume, it is difficult to control, which leads to the difficulty in simulating human respiration and the difficulty in realizing the accurate test of the performance of the breathing machine. SUMMARY

[0003] In order to solve the problems in the background, the present application aims to provide a tidal volume curve measuring device and method for an artificial lung of an air breathing machine.

[0004] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme: a tidal volume curve measuring device for an artificial lung of an air breathing machine, comprising a variable volume pressure measuring device, a support arranged below the variable volume pressure measuring device and serving as a support, a gas supply device arranged on one side of the variable volume pressure measuring device, a test head mold arranged on one side of the variable volume pressure measuring device and serving as a gas flow conducting device, an artificial lung arranged below the test head mold and serving as a human lung respiration simulation device, a controller for driving a motor and collecting data, and a display for visualizing the collected results. The measuring personnel only needs to record the pressure sensor values of the variable volume pressure measuring device before and after the valve is opened, and then the corresponding tidal volume under the current state of the artificial lung can be obtained through calculation. The motor can change the state of the artificial lung, and the relationship curve between the tidal volume and the motor pulse number can be fitted through multiple measurements. The variable volume pressure measuring device comprises a head rope, a sleeve mouth gas guide cover, a guide pipe, a pressure sensor, a No. 1 gas storage tank, a manual valve, a No. 2 gas storage tank, and a tracheal interface. The head rope, the sleeve mouth gas guide cover, the guide pipe, the No. 1 gas storage tank, the manual valve, and the No. 2 gas storage tank are connected in sequence, and the pressure sensor for measuring the gas pressure in the tank is arranged above the No. 1 gas storage tank.

[0005] As a preferred embodiment of the present application, the artificial lung comprises a bellows, a photoelectric switch, a connecting rod device, a motor, and a machine shell. The bellows is connected to the top end of the connecting rod device and arranged on the top of the machine shell. The motor is connected to the bottom end of the connecting rod device and fixed on the bottom of the machine shell. The photoelectric switch is fixed on the side surface of the machine shell. The motor control interface is fixed on the side surface of the machine shell and connected to the controller. The opening of the connection between the bellows and the top of the machine shell is communicated with the test head mold.

[0006] The gas pipe interface provided on the catheter is connected with the gas pipe of the gas supply device, and the manual valve provided on the intermediate connecting part between the two gas tanks controls the gas flow between the tanks.

[0007] The bracket supporting the variable volume pressure measuring device is provided at the bottom of the second gas tank, the controller is provided on one side of the artificial lung, the motor and the data acquisition sensor are controlled through the connecting line, the display is provided near the controller and communicates with the controller through the connecting line to control the motor and visualize the data of the pressure sensor.

[0008] The gas supply device comprises a gas pipe, a ventilation valve, a gas pressure gauge and a high-pressure gas cylinder, the other end of the gas pipe is connected with the gas pipe interface provided on the variable volume pressure measuring device, the ventilation valve is provided at the gas outlet of the gas supply device, and the gas pressure gauge is provided above the high-pressure gas cylinder.

[0009] The method for measuring the tidal volume curve of the artificial lung of the air breathing machine comprises the following steps.

[0010] Step one: the total volume of the first gas tank, the second gas tank and the manual valve is obtained by the water measuring method, the manual valve is located in the middle position, so the upper and lower volumes of the first gas tank and the second gas tank are the same and are recorded as V1;

[0011] Step two: the ventilation valve is opened, a certain amount of gas is filled into the bellows, and then the ventilation valve is closed;

[0012] Step three: the initial volume V of the device is obtained by self-calibration, the part capable of storing gas outside the gas tank, including the gas pipe, the catheter, the sleeve gas guide cover, the artificial lung and the bellows, is regarded as a whole and is called the volume outside the tank, the motor is initialized to stretch the bellows to the position of triggering the photoelectric switch for zero positioning, and the volume outside the tank at this time is taken as the initial volume and is recorded as V;

[0013] Step four: the manual valve is tightened, the motor is rotated by N pulse numbers, the value of the pressure sensor at this time is recorded as P1, the manual valve is opened again, the value of the pressure sensor at this time is recorded as P2, according to the principle that the total amount of gas before and after the opening and closing of the manual valve is unchanged, the value of the initial volume V' is calculated by simultaneous equations, the change of the volume outside the tank after the motor is rotated by N pulse numbers is taken as the tidal volume and is recorded as ΔV1, and the specific calculation formula of the tidal volume is:

[0014] ΔV1=V-V';

[0015] Step five: the pulse number of the driving motor in step four is changed, step four is repeatedly performed for multiple times to obtain the tidal volume corresponding to different pulse numbers of the motor, and the tidal volume curve of the bellows type artificial lung is fitted.

[0016] As preferred of the present application, the step three comprises the following steps:

[0017] Step 1: tighten the manual valve, then the motor is initialized, the bellows is stretched to the zero point positioning through the connecting rod device, the value of the pressure sensor at this time is recorded as P1, the gas amount T1 at this time is calculated by formula, and the specific calculation formula is:

[0018] T1=P1*(V+V1);

[0019] Step 2: open the manual valve, record the value of the pressure sensor at this time as P2, calculate the gas amount T2 at this time by formula, and the specific calculation formula is:

[0020] T2=P2*(V+2V1);

[0021] Step 3: according to the principle that the total amount of gas before and after the manual valve is switched does not change, the initial volume value is calculated by formula, and the specific calculation formula is:

[0022] P1*(V+V1)=P2*(V+2V1)。

[0023] As preferred of the present application, the step four comprises the following steps:

[0024] Step 1: tighten the manual valve, control the motor to rotate N pulse numbers, drive the connecting rod device to lift the bellows by a certain distance, at this time the volume outside the tank is compressed to V', record the value of the pressure sensor at this time as P3, calculate the gas amount T3 at this time by formula, and the specific calculation formula is:

[0025] T3=P3*(V'+V1);

[0026] Step 2: open the manual valve, record the value of the pressure sensor at this time as P4, calculate the gas amount T4 at this time by formula, and the specific calculation formula is:

[0027] T4=P4*(V'+2V1);

[0028] Step 3: according to the principle that the total amount of gas before and after the manual valve is switched does not change, the initial volume value V' is calculated by formula, and the specific calculation formula is:

[0029] P3*(V'+V1)=P4*(V'+2V1);

[0030] Step 4: the volume change of the tank outside after the driving motor N pulse numbers is taken as the tidal volume, recorded as ΔV1, and the specific calculation formula of the tidal volume is:

[0031] ΔV1=V-V'。

[0032] Compared with the prior art, the present application has the following advantages:

[0033] 1、The present application can realize accurate measurement of the tidal volume curve of the corrugated tube type artificial lung, provide a basis for accurate control of the tidal volume of the motor, further guarantee the detection of the positive pressure air breathing machine, and avoid fire personnel casualties caused by false detection of the positive pressure air breathing machine.

[0034] 2. The measurement method can calibrate the device itself, so that it has better accuracy.

[0035] 3. In terms of practical performance, the present application has simple process structure, low cost and easy operation. BRIEF DESCRIPTION OF DRAWINGS

[0036] Fig. 1 It is the front view of the present application;

[0037] Fig. 2 It is the structure diagram of the artificial lung of the present application;

[0038] Fig. 3 It is the structure diagram of the variable volume pressure measuring device of the present application;

[0039] Fig. 4 It is the structure diagram of the gas supply device of the present application.

[0040] In the figure: 1, test head mold; 2, artificial lung; 3, variable volume pressure measuring device; 4, support; 5, display; 6, controller; 7, gas supply device; 21, corrugated tube; 22, photoelectric switch; 23, connecting rod device; 24, motor; 25, machine shell; 31, head rope; 32, sleeve port gas guide cover; 33, catheter; 34, pressure sensor; 35, No. 1 gas tank; 36, manual valve; 37, No. 2 gas tank; 38, tracheal interface; 71, trachea; 72, ventilation valve; 73, air pressure gauge; 74, high-pressure gas cylinder. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0042] As Figs. 1 to 4As shown, the present application provides a kind of artificial lung tidal volume curve measuring device for air breathing machine, including variable volume pressure measuring device 3, support 4 being arranged below variable volume pressure measuring device 3 and playing the role of support, gas supply device 7 being arranged at one side of variable volume pressure measuring device 3, test head mould 1 being arranged at one side of variable volume pressure measuring device 3 and being used for conducting airflow, artificial lung 2 being arranged below test head mould 1 and being used for simulating human lung breathing, controller 6 for driving motor 24 and collecting data, display 5 for visualizing collection results, variable volume pressure measuring device 3 includes head rope 31, sleeve mouth gas guide cover 32, catheter 33, pressure sensor 34, No.1 gas tank 35, manual valve 36, No.2 gas tank 37, tracheal interface 38, head rope 31, sleeve mouth gas guide cover 32, catheter 33, No.1 gas tank 35, manual valve 36, No.2 gas tank 37 are sequentially connected, and pressure sensor 34 is arranged above No.1 gas tank 35 for sensing gas pressure in tank body.

[0043] Artificial lung 2 includes bellows 21, photoelectric switch 22, connecting rod device 23, motor 24, shell 25, bellows 21 is connected with the top end of connecting rod device 23 and is arranged at the top of shell 25, motor 24 is connected with the bottom end of connecting rod device 23 and is fixed at the bottom of shell 25, motor 24 rotates to drive connecting rod device 23 to swing, the swing of connecting rod device 23 can drive bellows 21 to stretch and compress, change the volume of bellows 21, photoelectric switch 22 fixed on the side of shell 25 is used for sensing, motor control interface is fixed on the side of shell 25 and is connected with controller 6, the opening of the connection between bellows 21 and the top of shell 25 is communicated with test head mould 1.

[0044] Tracheal interface 38 arranged on catheter 33 is connected with trachea 71 and receives gas delivery, manual valve 36 arranged in the middle position of No.1 gas tank 35 and No.2 gas tank 37 is used for controlling the gas flow between the two tank bodies, under the condition that the amount of gas is unchanged, the pressure in the tank changes before and after manual valve 36 is opened.

[0045] Support 4 is arranged at the bottom of No.2 gas tank 37, the bottom end of support 4 is fixed on the horizontal plane, and the top end is arranged at the bottom of No.2 gas tank 37 to support variable volume pressure measuring device 3, and further includes controller 6, controller 6 is arranged on one side of artificial lung 2, controls motor 24 and collects sensor data through connecting line, and communicates with display 5 through connecting line, motor 24 control and pressure sensor 34 data visualization are carried out on display 5, which simplifies operation and facilitates measurement.

[0046] The air supply device 7 includes a gas pipe 71, a ventilation valve 72, a gas pressure gauge 73, and a high-pressure gas cylinder 74. The gas pipe 71 is connected to the gas pipe interface 38 provided on the variable volume pressure measuring device 3. The ventilation valve 72 provided on the air outlet of the air supply device 7 controls the inflation of the bellows 21 by the high-pressure gas cylinder 74 to prevent the deformation of the bellows 21 when it is stretched. The gas pressure gauge 73 is provided above the high-pressure gas cylinder 74.

[0047] A tidal volume curve measurement method for an artificial lung of an air breathing machine, comprising the following steps:

[0048] Step one: obtain the total volume of the No. 1 gas storage tank 35, the No. 2 gas storage tank 37, and the manual valve 36 by the water displacement method. The manual valve 36 is located in the middle position, so the upper and lower volumes of the No. 1 gas storage tank 35 and the No. 2 gas storage tank 37 are the same, and are recorded as V1.

[0049] Step two: open the ventilation valve 72, inflate a certain amount of gas into the bellows 21, and then close the ventilation valve 72.

[0050] Step three: obtain the initial volume V of the device by self-calibration. The part of the gas storage tank that can store gas outside, including the gas pipe 71, the guide pipe 33, the sleeve gas guide cover 32, the artificial lung 2, and the bellows 21, is regarded as a whole, which is called the volume outside the tank. The motor 24 initializes to stretch the bellows 21 to the triggering photoelectric switch 22 to position the zero point. At this time, the volume outside the tank is recorded as the initial volume V.

[0051] Step four: tighten the manual valve 36, control the motor 24 to rotate N pulse numbers, record the value of the pressure sensor 34 at this time as P2, open the manual valve 36 again, and record the value of the pressure sensor 34 at this time as P3. According to the principle that the total amount of gas before and after the opening and closing of the manual valve 36 remains unchanged, the value of the initial volume V' is calculated by the formula. The change in the volume outside the tank after the motor 24 rotates N pulse numbers is taken as the tidal volume, which is recorded as ΔV1. The specific calculation formula of the tidal volume is:

[0052] ΔV1=V-V';

[0053] Step five: change the pulse number of the driving motor 24 in step four, repeat step four multiple times to obtain the tidal volume corresponding to different pulse numbers of the motor 24, and fit the tidal volume curve of the bellows type artificial lung.

[0054] Step three includes the following steps:

[0055] Step 1: tighten the manual valve 36, then initialize the motor 24, stretch the bellows 21 to the triggering photoelectric switch 22 through the connecting rod device 23 to position the zero point, record the value of the pressure sensor 34 at this time as P1, and calculate the gas amount T1 at this time by the formula:

[0056] T1=P1*(V+V1);

[0057] Step 2: open the manual valve 36, record the value of the pressure sensor 34 at this time P2, the formula calculation of the gas amount T2 at this time is:

[0058] T2=P2*(V+2V1);

[0059] Step 3: according to the principle that the total amount of gas before and after the manual valve 36 is switched, the initial volume value is calculated by simultaneous equations, and the specific calculation formula is:

[0060] P1*(V+V1)=P2*(V+2V1)。

[0061] Step four includes the following steps:

[0062] Step 1: tighten the manual valve 36, control the motor 24 to rotate N pulse numbers, drive the connecting rod device 23 to lift the corrugated pipe 21 by a certain distance, at this time the tank volume is compressed to V', record the value of the pressure sensor 34 at this time P3, the formula calculation of the gas amount T3 at this time is:

[0063] T3=P3*(V'+V1);

[0064] Step 2: open the manual valve 36, record the value of the pressure sensor 34 at this time P4, the formula calculation of the gas amount T4 at this time is:

[0065] T4=P4*(V'+2V1);

[0066] Step 3: according to the principle that the total amount of gas before and after the manual valve 36 is switched, the initial volume V' is calculated by simultaneous equations, and the specific calculation formula is:

[0067] P3*(V'+V1)=P4*(V'+2V1);

[0068] Step 4: the change of the tank volume after the driving motor 24 N pulse numbers is taken as the tidal volume, which is recorded as AV1, and the specific calculation formula of the tidal volume is:

[0069] AV1=V-V'。

[0070] The air breathing machine artificial lung tidal volume curve measuring device and method designed by the application solves the corrugated pipe type artificial lung tidal volume measurement problem, provides an air breathing machine artificial lung tidal volume curve measuring device and method, provides a basis for realizing accurate control of the corrugated pipe type artificial lung tidal volume, and guarantees the performance detection effect of the positive pressure air breathing machine.

[0071] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other inventors can develop based on the same general inventive concepts embodied by the described embodiments. That is, although the present application is described in terms of particular embodiments and illustrative figures, it should be apparent that the scope of the present application is not limited to these specific embodiments.

[0072] While the embodiments of the application have been shown and described herein, it is to be understood that the scope of the application, jointly pointed out in the appended claims, is not to be limited to the above-described embodiments but can be otherwise variously changed, modified, replaced, and altered within the principles and spirit of the present application.

Claims

1. A tidal volume curve measuring device for an artificial lung of an air breathing machine, characterized by: The variable volume pressure measuring device (3), the support (4) arranged below the variable volume pressure measuring device (3) and serving as a support, the gas supply device (7) arranged on one side of the variable volume pressure measuring device (3), the test head mold (1) arranged on the other side of the variable volume pressure measuring device (3) and serving as a gas flow guide, the artificial lung (2) arranged below the test head mold (1) and serving as a human lung breathing simulation, the controller (6) for driving the motor (24) and collecting data, and the display (5) for visualizing the collected results, wherein the variable volume pressure measuring device (3) comprises a head rope (31), a sleeve mouth gas guide cover (32), a guide pipe (33), a pressure sensor (34), a No. 1 gas tank (35), a manual valve (36), a No. 2 gas tank (37), and a tracheal interface (38), the head rope (31), the sleeve mouth gas guide cover (32), the guide pipe (33), the No. 1 gas tank (35), the manual valve (36), and the No. 2 gas tank (37) are sequentially connected, and the pressure sensor (34) is arranged above the No. 1 gas tank (35).

2. The apparatus for measuring the tidal volume curve of an artificial lung for an air breathing machine according to claim 1, characterized in that: The artificial lung (2) comprises a bellows (21), a photoelectric switch (22), a connecting rod device (23), a motor (24), and a machine shell (25), the bellows (21) is connected with the top end of the connecting rod device (23) and arranged on the top of the machine shell (25), the motor (24) is connected with the bottom end of the connecting rod device (23) and fixed on the bottom of the machine shell (25), the photoelectric switch (22) is fixed on the side of the machine shell (25), the motor (24) control interface is fixed on the side of the machine shell (25) and connected with the controller (6), and the opening of the connecting position of the bellows (21) and the top of the machine shell (25) is communicated with the test head mold (1).

3. The apparatus for measuring the tidal volume curve of an artificial lung for an air breathing machine according to claim 1, characterized in that: The tracheal interface (38) is arranged on the guide pipe (33).

4. The apparatus for measuring the tidal volume curve of an artificial lung for an air breathing machine according to claim 2, characterized in that: The gas supply device (7) comprises a gas pipe (71), a ventilation valve (72), a gas pressure gauge (73), and a high-pressure gas cylinder (74), one end of the gas pipe (71) is directly connected with the gas outlet of the high-pressure gas cylinder (74) in the gas supply device (7) for receiving the gas output by the high-pressure gas cylinder (74), the other end of the gas pipe (71) is connected with the tracheal interface (38) arranged on the variable volume pressure measuring device (3), and the ventilation valve (72) is arranged at the gas outlet of the gas supply device (7).

5. The method of using a tidal volume curve measuring device for an artificial lung of a ventilator according to claim 4, characterized in that: The method comprises the following steps: Step one: obtaining the total volume of the No. 1 gas tank (35), the No. 2 gas tank (37), and the manual valve (36) by the water measuring method, the manual valve (36) is located in the middle position, so the upper and lower parts of the No. 1 gas tank (35) and the No. 2 gas tank (37) have the same volume V1; Step two: opening the ventilation valve (72), filling a certain amount of gas into the bellows (21), and then closing the ventilation valve (72); Step three: carry out self-calibration to obtain the value of the initial volume V of the device, and the part capable of storing gas outside the gas tank is regarded as a whole, including the air pipe (71), the guide pipe (33), the sleeve air guide cover (32), the artificial lung (2), and the corrugated pipe (21), which is referred to as the tank outside volume, the motor (24) is initialized to stretch the corrugated pipe (21) to the position of the trigger photoelectric switch (22) to carry out zero positioning, and the tank outside volume at this time is taken as the initial volume, which is denoted as V. Step four: tighten the manual valve (36), control the motor (24) to rotate N pulse numbers, record the value of the pressure sensor (34) at this time as P3, then open the manual valve (36), and record the value of the pressure sensor (34) at this time as P4, according to the principle that the total amount of gas before and after the opening and closing of the manual valve (36) is unchanged, the value of the initial volume V' is calculated by simultaneously solving the formula, the change of the tank outside volume corresponding to N pulse numbers of the motor (24) is taken as the tidal volume, which is denoted as AV1, and the specific calculation formula of the tidal volume is: AV1=V-V'; Step five: change the pulse number of the driving motor (24) in step four, repeat step four multiple times to obtain the tidal volume corresponding to different pulse numbers of the motor (24), and fit the tidal volume curve of the corrugated pipe type artificial lung.

6. The method of claim 5, wherein: The step three comprises the following steps: Step 1: tighten the manual valve (36), then initialize the motor (24), stretch the corrugated pipe (21) to the position of the trigger photoelectric switch (22) through the connecting rod device (23) to carry out zero positioning, record the value of the pressure sensor (34) at this time as P1, and calculate the gas amount T1 at this time by formula, and the specific calculation formula is: T1=P1*(V+V1); Step 2: open the manual valve (36), record the value of the pressure sensor (34) at this time as P2, and calculate the gas amount T2 at this time by formula, and the specific calculation formula is: T2=P2*(V+2V1); Step 3: according to the principle that the total amount of gas before and after the opening and closing of the manual valve (36) is unchanged, the value of the initial volume is calculated by simultaneously solving the formula, and the specific calculation formula is: P1*(V+V1)=P2*(V+2V1).

7. The method of claim 5, wherein: The step four comprises the following steps: Step 1: tighten the manual valve (36), control the motor (24) to rotate N pulse numbers, drive the connecting rod device (23) to lift the corrugated pipe (21) by a certain distance, at this time the tank outside volume is compressed to V', record the value of the pressure sensor (34) at this time as P3, and calculate the gas amount T3 at this time by formula, and the specific calculation formula is: T3=P3*(V'+V1); Step 2: open the manual valve (36), record the value of the pressure sensor (34) at this time as P4, and calculate the gas amount T4 at this time by formula, and the specific calculation formula is: T4=P4*(V'+2V1); Step 3: according to the principle that the total amount of gas before and after the opening and closing of the manual valve (36) is unchanged, the value of the initial volume V' is calculated by simultaneously solving the formula, and the specific calculation formula is: P3*(V'+V1)=P4*(V'+2V1); Step 4: the change of the tank outside volume corresponding to N pulse numbers of the driving motor (24) is taken as the tidal volume, which is denoted as AV1, and the specific calculation formula of the tidal volume is: AV1 = V - V'. AV2 = V' - V.

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