A device for detecting a dead space of a resuscitator

Abstract

The utility model relates to resuscitator dead space detection technical field, concretely is a kind of resuscitator dead space detection device, it include: base, the upper end of base is placed with transparent rigid container, and transparent rigid container between connection has trachea, the inside of transparent rigid container is provided with latex air bag, and latex air bag between through trachea constitute intercommunication connection, the middle part upper surface of base is fixed with fixed frame, and transparent rigid container is formed and is engaged with the base between the connection through fixed frame, the upper end of fixed frame is welded with support plate. Resuscitator dead space detection device is controlled by standardization component and solenoid valve, ensure the use convenience and safety of the device, through the reasonable setting of structure, not only can the dead space of mask this conventional product be accurately detected, but also can the effective detection of rescue type suction and breathing dead space product be carried out.

Description

Technical Field

[0001] This utility model relates to the field of dead space detection technology for resuscitators, specifically a device for detecting dead space in resuscitators. Background Technology

[0002] Dead space testing is a method of estimating dead space size based on differences in gas concentration. During the resuscitation device testing, the patient inhales a gas mixture containing a known concentration of CO2 through a breathing mask. This mixture is prepared using a dynamic mixer to achieve a pre-set ratio of CO2 and oxygen. Simultaneously, the patient's breathing tidal gas is introduced into a breathing gas flow meter through a specially designed inhalation tube. The gas flow meter monitors the patient's respiratory flow in real time and calculates the patient's dead space volume.

[0003] A search revealed a protective equipment dead space testing device with publication number CN202122871972, which includes a breathing device and a carbon dioxide inlet. It improves the detection rate and accuracy by quickly adjusting the gas content ratio and using a quickly detachable filter. However, this device only collects and processes gas through a single breathing box and cylinder, has poor structural standardization, low detection accuracy, and the dead space content is only estimated by carbon dioxide content, resulting in low accuracy in volume calculation. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a device for detecting the dead space of a resuscitator, thus solving the problems mentioned in the background section.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a device for detecting the dead space of a resuscitator, comprising:

[0006] A base is provided, with a transparent rigid container mounted on its upper end. Air tubes connect the transparent rigid containers, and latex airbags are installed inside each container, connected by air tubes. A mounting bracket is fixed to the upper surface of the middle section of the base, and the transparent rigid containers are engaged with the base via the mounting bracket. A support plate is welded to the upper end of the mounting bracket. A gas flow meter is bolted to one side of the upper surface of the support plate, and an oxygen interface is provided at the lower end of the gas flow meter. A tidal volume detector is also bolted to the upper surface of the same side of the support plate. The middle section of the support plate... A gas pressure gauge is bolted to the upper surface. An oxygen concentration detector is bolted to the upper surface of the middle part of the support plate. A first solenoid valve, a second solenoid valve, and a third solenoid valve are bolted to the upper surface of the other side of the support plate. One end of the second solenoid valve is connected to a resuscitator interface via an air tube. A one-way valve is fitted to the connection between the resuscitator interface and the transparent rigid container via an air tube. A water inlet pipe is connected to the upper surface of the transparent rigid container. A control switch is bolted to the upper surface of the support plate on the side of the support plate near the tidal volume detector. Adjusting water is laid on the lower inner side of the transparent rigid container.

[0007] Preferably, the transparent rigid containers are interconnected, and the oxygen interface is interconnected with the transparent rigid containers through a gas flow meter and a tidal volume detector.

[0008] Preferably, the gas pressure gauge is connected to the transparent rigid container via a second solenoid valve and a one-way valve.

[0009] Preferably, the transparent rigid container is connected to the oxygen concentration detector via the first solenoid valve, and the control switch is electrically connected to the first solenoid valve, the second solenoid valve, and the third solenoid valve.

[0010] Preferably, the water inlet pipe is connected to the transparent rigid container, and the transparent rigid container and the latex airbag form an enclosing structure.

[0011] This utility model provides a device for detecting the dead space of a resuscitator, which has the following beneficial effects: The device includes a base, a transparent rigid container mounted on the upper end of the base, and air tubes connecting the transparent rigid containers. Latex airbags are disposed inside the transparent rigid containers, and the latex airbags are connected to each other via air tubes. A fixing frame is fixed to the upper surface of the middle part of the base, and the transparent rigid containers are engaged with the base via the fixing frame. A support plate is welded to the upper end of the fixing frame. The device for detecting the dead space of a resuscitator, through standardized components and solenoid valve control, ensures ease of use and safety. Through its rational structural design, it can accurately detect the dead space of not only conventional products like masks, but also effectively detect the dead space of resuscitation-related respiratory and expiratory products. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the main structure of the present invention in its working state;

[0013] Figure 2 This is a schematic diagram illustrating the working principle of this utility model.

[0014] In the diagram: 1. Base; 2. Transparent rigid container; 3. Latex airbag; 4. Fixing frame; 5. Support plate; 6. Gas flow meter; 7. Oxygen interface; 8. Tidal volume detector; 9. Gas pressure gauge; 10. Oxygen concentration detector; 11. First solenoid valve; 12. Second solenoid valve; 13. Third solenoid valve; 14. Air tube; 15. Resuscitator interface; 16. Check valve; 17. Water inlet pipe; 18. Control switch; 19. Adjusting water. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0016] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0018] Please see Figures 1-2A device for detecting dead space in a resuscitator includes: a base 1; three transparent rigid containers 2 are mounted on the upper end of the base 1, each with the same capacity of 10L, and their tops and bottoms are connected; air tubes 14 connect the transparent rigid containers 2, forming a communication between them; the air tubes 14 are used to connect the transparent rigid containers 2 via double or triple fittings, allowing gas exchange between the transparent rigid containers 2; latex airbags 3 are disposed inside the transparent rigid containers 2, and the latex airbags 3 are connected to each other via the air tubes 14, and the transparent rigid containers 2 and latex airbags are connected... The three components form an enclosing structure. The transparent rigid container 2 is used to enclose and protect the latex airbags 3, and each latex airbag 3 has a volume of 3L. A fixing frame 4 is fixed to the upper surface of the middle part of the base 1, and the transparent rigid container 2 is connected to the base 1 by a snap-fit ​​connection through the fixing frame 4. A support plate 5 is welded to the upper end of the fixing frame 4. A gas flow meter 6 is bolted to one side of the upper surface of the support plate 5. An oxygen interface 7 is provided at the lower end of the gas flow meter 6, and the oxygen interface 7 is connected to the transparent rigid container 2 through the gas flow meter 6 and the moisture meter 8. A moisture meter 8 is also bolted to the upper surface of the same side of the support plate 5. A gas pressure gauge 9 is bolted to the upper surface of the middle section of the support plate 5. An oxygen concentration detector 10 is also bolted to the upper surface of the middle section of the support plate 5. A first solenoid valve 11, a second solenoid valve 12, and a third solenoid valve 13 are bolted to the other upper surface of the support plate 5. The transparent rigid container 2 is connected to the oxygen concentration detector 10 via the first solenoid valve 11. One end of the second solenoid valve 12 is connected to a resuscitator interface 15 via a tracheal tube 14. A one-way valve 16 is fitted at the connection between the resuscitator interface 15 and the transparent rigid container 2 via the tracheal tube 14. The gas pressure gauge 9 is connected to the transparent rigid container 2 via the second solenoid valve 12 and the one-way valve 16. The transparent rigid container 2 is connected to the upper surface of the container, and the lower inner side of the transparent rigid container 2 is covered with regulating water 19. The water inlet pipe 17 is connected to the transparent rigid container 2 and is used to introduce regulating water 19 into the transparent rigid container 2. The upper surface of the support plate 5 near the moisture meter 8 is bolted with a control switch 18, and the control switch 18 is electrically connected to the first solenoid valve 11, the second solenoid valve 12 and the third solenoid valve 13. The control switch 18 is used to control the opening and closing of the first solenoid valve 11, the second solenoid valve 12 and the third solenoid valve 13, which is convenient for the operator to operate.

[0019] The method for detecting the dead space of the resuscitator of this invention is as follows:

[0020] S1: Close the oxygen concentration detector 10, the first solenoid valve 11 and the third solenoid valve 13, connect the resuscitator, and ventilate until the latex air bag 3 completely fills the container and presses against the inner wall.

[0021] S2: Close the second solenoid valve 12, open the oxygen concentration detector 10, the first solenoid valve 11 and the gas flow meter 6 to fill the container with 100% oxygen. When the pressure gauge reading is 1 kPa, close the oxygen concentration detector 10, the first solenoid valve 11 and the gas flow meter 6.

[0022] S3: Test the dead space of the system. First, connect the resuscitator and introduce an appropriate flow of air into the latex bag 3. Open the second solenoid valve 12 to flush the expiratory channel with oxygen, and press the PEEP valve at least 50 times. Close the second solenoid valve 12, open the first solenoid valve 11 of the oxygen concentration detector 10, adjust the oxygen flow rate to 5L / min, and record the oxygen concentration reading F. bo2 When the pressure gauge returns to 1 kPa, the oxygen flow is shut off. The system dead space is calculated using the following formula:

[0023]

[0024] S4: Dead Space Test for Resuscitator

[0025] S41: Open the third solenoid valve 13, add water to the container, ensuring compliance is 0.2 L / kPa and expiratory resistance is 0.5 kPa / (L / a), connect the resuscitator with 100% oxygen, close the second solenoid valve 12, and press the PEEP valve at least 15 times when the oxygen flow rate is 30 L / min. When the tidal volume reaches 600 mL, close the second solenoid valve 12, open the first solenoid valve 11 of the oxygen concentration detector 10, and record the oxygen concentration reading F. 1bo2 Use the formula:

[0026]

[0027] S42: Open the third solenoid valve 13, add water to the container, ensuring compliance is 0.1 L / kPa and expiratory resistance is 0.2 kPa / (L / a), connect the resuscitator with 100% oxygen, close the second solenoid valve 12, and press the PEEP valve at least 50 times when the oxygen flow rate is 5 L / min. When the tidal volume reaches 100 mL, close the second solenoid valve 12, open the first solenoid valve 11 of the oxygen concentration detector 10, and record the oxygen concentration reading F. 2bo2 Use the formula:

[0028]

[0029] In summary, based on the detection method of the dead space detection device of this resuscitator, there are:

[0030] Based on the requirements, if V1≤6ml, that is:

[0031]

[0032] Solving for F, we get: bO2 ≤21.79, and because the oxygen concentration F bO2 The measured value cannot be lower than the oxygen concentration in the air, so 21% ≤ F bO2 ≤21.79%;

[0033] If F bO2 When =22%, according to the formula:

[0034]

[0035] Substituting into the formula for verification, we get:

[0036]

[0037] Multiply by the tidal volume of 600ml to get:

[0038]

[0039] That is, when F bo2 When the concentration is 22%, the value of the dead space V1 in the system is 7.5949 ml;

[0040] Based on the previous derivation, when F bo2 When the concentration is 21.79%, V1 = 6 ml. Now, let's verify F. bo2 When V = 22%, V1 also increases accordingly, which is in line with expectations.

[0041] The invention's calculation method and principle are based on the Bohr equation correction method and the constant breathing method, and include the following steps: S21: Based on the constant breathing method, the subject inhales a mixed gas containing 0.1% CO, 20% O2, and N2 in equilibrium for 56 minutes. The initial exhaled air is discarded. After several minutes, when a constant state is considered to have been reached, the exhaled air is collected for 2 minutes in a storage bag, and the concentration fractions of the following gases in the exhaled air are analyzed: N2, CO2, and O2.

[0042] S22: Based on the Bohr equation correction method:

[0043] By comparing alveolar carbon dioxide partial pressure ( ) and the partial pressure of carbon dioxide in the mixed exhaled air ( ), calculate the ratio of physiological dead space to tidal volume (V D / V T ):

[0044]

[0045] When using 100% oxygen, the dead space can be indirectly deduced by the change in exhaled oxygen concentration.

[0046] S23:V e The sum of the simulated residual gas volume and the gas volume of the gas reservoir is calculated by first measuring the gas volume (V) of the gas reservoir before repeated breathing, correcting it with STPD, and then using the following formula:

[0047] The sum of residual gas volume and gas volume in the gas storage bag

[0048]

[0049] Where: V col = The volume of exhaled air in the storage bag;

[0050] V sam =Volume of gas used for analysis;

[0051] T col =Time to collect exhaled air (min);

[0052] The formulas for calculating VO2 are:

[0053]

[0054] In the formula F O2 =Inhaled air O2 concentration fraction;

[0055] FE CO2 = Fraction of CO2 concentration in exhaled breath;

[0056] FI CO2 = CO2 concentration fraction in inhaled air;

[0057] By combining this method with the modified Bohr equation, the final formula for calculating the dead space of the system is:

[0058] .

[0059] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A device for detecting the dead space of a resuscitator, characterized in that, include: A base (1) is provided with a transparent rigid container (2) at its upper end. The transparent rigid containers (2) are connected by an air tube (14). The transparent rigid containers (2) are provided with latex airbags (3) inside. The latex airbags (3) are connected by the air tube (14). A fixing frame (4) is fixed on the upper surface of the middle part of the base (1). The transparent rigid containers (2) are connected to the base (1) by the fixing frame (4). A support plate (5) is welded to the upper end of the fixing frame (4). A gas flow meter (6) is installed on one side of the upper surface of the support plate (5) by bolts. An oxygen interface (7) is provided at the lower end of the gas flow meter (6). A tidal volume detector (8) is also installed on the upper surface of the same side of the support plate (5) by bolts. The upper surface of the middle part of the support plate (5) is also provided with a support plate (5). A gas pressure gauge (9) is bolted on. An oxygen concentration detector (10) is bolted on the upper surface of the middle part of the support plate (5). A first solenoid valve (11), a second solenoid valve (12), and a third solenoid valve (13) are bolted on the upper surface of the other side of the support plate (5). One end of the second solenoid valve (12) is connected to a resuscitator interface (15) via an air pipe (14). A one-way valve (16) is fitted at the connection between the resuscitator interface (15) and the transparent rigid container (2) via an air pipe (14). A water inlet pipe (17) is connected to the upper surface of the transparent rigid container (2). A control switch (18) is bolted on the upper surface of the support plate (5) on the side near the tidal volume detector (8). A regulating water (19) is laid on the lower inner side of the transparent rigid container (2).

2. The device for detecting dead space in a resuscitator according to claim 1, characterized in that: The transparent rigid containers (2) are connected to each other, and the oxygen interface (7) is connected to the transparent rigid containers (2) through the gas flow meter (6) and the tidal volume detector (8).

3. The device for detecting dead space in a resuscitator according to claim 1, characterized in that: The gas pressure gauge (9) is connected to the transparent rigid container (2) via the second solenoid valve (12) and the one-way valve (16).

4. The device for detecting dead space in a resuscitator according to claim 1, characterized in that: The transparent rigid container (2) is connected to the oxygen concentration detector (10) via the first solenoid valve (11), and the control switch (18) is electrically connected to the first solenoid valve (11), the second solenoid valve (12) and the third solenoid valve (13).

5. The device for detecting dead space in a resuscitator according to claim 1, characterized in that: The water inlet pipe (17) is connected to the transparent rigid container (2), and the transparent rigid container (2) and the latex airbag (3) form an enclosing structure.

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