Detection device and detection method for dead space of resuscitator

Abstract

The invention relates to the technical field of resuscitator dead space detection, in particular to a resuscitator dead space detection device and a detection method thereof.The resuscitator dead space detection device comprises a base, transparent rigid containers are arranged at the upper end of the base, an air pipe is connected between the transparent rigid containers, and latex air bags are arranged in the transparent rigid containers; the latex air bags are communicated and connected through air pipes, a fixing frame is fixed to the upper surface of the middle of the base, the transparent rigid container is connected with the base in a clamped mode through the fixing frame, and a supporting plate is welded to the upper end of the fixing frame. Through standardized components and electromagnetic valve control, the use convenience and safety of the device are ensured, through reasonable arrangement of the structure and an accurate detection method, not only can the dead space of a conventional product such as a mask be accurately detected, but also rescue type inhalation and exhalation dead space products can be effectively detected.

Description

Technical Field

[0001] The present invention relates to the technical field of resuscitator dead space detection, and in particular to a resuscitator dead space detection device and a detection method thereof. Background Art

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

[0003] After searching, there is a dead space testing device for protective equipment with publication number CN202122871972, which includes a breathing device. The breathing device is also provided with a carbon dioxide inlet. It improves the detection rate and detection accuracy by quickly adjusting the gas content ratio and a quickly disassembled filter device. However, the device only collects and processes the gas through a single breathing box and cylinder, and the structural standardization is poor, the detection accuracy is low, and the dead space content is only calculated by the carbon dioxide content, and the volume calculation accuracy is low. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a device and method for detecting dead space in a resuscitator, which solve the existing problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a resuscitator dead space detection device and detection method, comprising: The base comprises a transparent rigid container placed on the upper end of the base, and an air tube is connected between the transparent rigid containers, a latex air bag is arranged inside the transparent rigid container, and the latex air bags are connected through the air tube, a fixing frame is fixed to the upper surface of the middle part of the base, and the transparent rigid container is connected to the base through the fixing frame, a support plate is welded to the upper end of the fixing frame, a gas flow meter is installed on the upper surface of one side of the support plate by bolts, an oxygen interface is provided at the lower end of the gas flow meter, a tidal volume detector is also installed on the upper surface of the same side of the support plate by bolts, and the middle part of the support plate is fixed to the upper surface of the same side of the support plate. A gas pressure gauge is installed on the upper surface by bolts, and an oxygen concentration detector is also installed on the middle upper surface of the support plate by bolts. A first solenoid valve, a second solenoid valve and a third solenoid valve are respectively installed on the upper surface of the other side of the support plate by bolts. One end of the second solenoid valve is connected to a resuscitator interface through an air pipe, and a one-way valve is installed at the connection between the resuscitator interface and the transparent rigid container through the air pipe. The upper end surface of the transparent rigid container is connected to a water inlet pipe, and a control switch is installed on the upper surface of the support plate close to the tidal volume detector by bolts. Regulating water is laid on the inner lower end of the transparent rigid container.

[0006] Preferably, the transparent rigid containers are connected to each other, and the oxygen interface is connected to the transparent rigid container through a gas flow meter and a tidal volume detector.

[0007] Preferably, the gas pressure gauge is connected to the transparent rigid container via a second solenoid valve and a one-way valve.

[0008] Preferably, the transparent rigid container is connected to the oxygen concentration detector through 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.

[0009] Preferably, the water inlet pipe and the transparent rigid container are connected, and the transparent rigid container and the latex airbag form an enclosing structure.

[0010] Preferably, the method for detecting the dead space of the resuscitator comprises the following steps: S1: Inflate the airbag: 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 airbag (3) completely fills the container and presses the inner wall; S2: oxygen supply: close the second electromagnetic valve (12), open the oxygen concentration detector (10), the first electromagnetic valve (11) and the gas flow meter (6), and fill the container with 100% oxygen. When the pressure gauge reads 1 kPa, close the oxygen concentration detector (10), the first electromagnetic valve (11) and the gas flow meter (6); S3: Test the dead space of the system: first connect the resuscitator, let the atmosphere into the latex air bag (3), open the second solenoid valve (12) to flush the exhalation channel with oxygen, and press the PEEP valve at least 50 times; close the second solenoid valve (12), open the oxygen concentration detector (10) and the first solenoid valve (11), adjust the oxygen flow rate to 5L / min, and record the oxygen concentration reading F bo2 When the pressure gauge returns to 1kPa, the oxygen flow is turned off and the dead space of the system is calculated using the formula:

[0011] S4: Resuscitator Dead Space Test S41: Open the third solenoid valve (13), add water to the container, ensure that the compliance is 0.2L / kPa, and the expiratory resistance is 0.5kPa / (L / a), connect the resuscitator, and connect the resuscitator to 100% oxygen, close the second solenoid valve (12), when the intake oxygen flow is 30L / min, press the PEEP valve at least 15 times, when the tidal volume is 600mL, close the second solenoid valve (12), open the oxygen concentration detector (10) and the first solenoid valve (11), and record the oxygen concentration reading F 1bo2 , using the formula:

[0012] S42: Open the third solenoid valve (13), add water to the container, ensure that the compliance is 0.1L / kPa, and the expiratory resistance is 0.2kPa / (L / a), connect the resuscitator, and connect the resuscitator to 100% oxygen, close the second solenoid valve (12), when the intake oxygen flow is 5L / min, press the PEEP valve at least 50 times, when the tidal volume is 100mL, close the second solenoid valve (12), open the oxygen concentration detector (10) and the first solenoid valve (11), and record the oxygen concentration reading F 2bo2 , using the formula: .

[0013] The present invention has the following beneficial effects: a detection device for the dead space of a resuscitator of the present invention comprises: a base, a transparent rigid container is placed on the upper end of the base, and an air tube is connected between the transparent rigid containers, a latex air bag is arranged inside the transparent rigid container, and the latex air bags are connected through the air tube, a fixing frame is fixed to the upper surface of the middle part of the base, and the transparent rigid container is connected to the base through a snap-fit connection between the fixing frame, and a support plate is welded to the upper end of the fixing frame. The present invention ensures the convenience and safety of use of the device through standardized components and solenoid valve control. Through reasonable structural settings and accurate detection methods, it can not only accurately detect the dead space of conventional products such as masks, but also effectively detect the dead space of rescue respiratory products. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the main structure of the present invention in working state; Figure 2 It is a schematic diagram of the working principle of the present invention.

[0015] In the figure: 1. Base; 2. Transparent rigid container; 3. Latex air bag; 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. Trachea; 15. Resuscitator interface; 16. One-way valve; 17. Water inlet pipe; 18. Control switch; 19. Water regulation. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0017] In the description of the present invention, unless otherwise specified, "plurality" means two or more; terms such as "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0018] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0019] See also Figure 1-Figure 2A dead space detection device for a resuscitator comprises: a base 1, a transparent rigid container 2 is placed on the upper end of the base 1, three transparent rigid containers 2 are provided, and each transparent rigid container 2 has the same specification and capacity, which is 10L, and its top and bottom are connected; an air tube 14 is connected between the transparent rigid containers 2, and the transparent rigid containers 2 are connected, and the air tube 14 is used to connect the transparent rigid containers 2 through a double-way or three-way connection, so that gas exchange can be carried out between the transparent rigid containers 2; a latex air bag 3 is provided inside the transparent rigid container 2, and the latex air bags 3 are connected through the air tube 14, and the transparent rigid container 2 and the latex air bag 3 forms an enclosing structure, the transparent rigid container 2 is used to surround and protect the latex airbag 3, and the volume of each latex airbag 3 is 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 through the fixing frame 4, and a support plate 5 is welded to the upper end of the fixing frame 4. A gas flow meter 6 is installed on the upper surface of one side of the support plate 5 by bolts, and 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 tidal volume detector 8. The tidal volume detector 8 is also installed on the upper surface of the same side of the support plate 5 by bolts. A gas pressure gauge 9 is installed on the upper surface of the middle part by bolts, and an oxygen concentration detector 10 is also installed on the upper surface of the middle part of the support plate 5 by bolts. The first solenoid valve 11, the second solenoid valve 12 and the third solenoid valve 13 are respectively installed on the upper surface of the other side of the support plate 5 by bolts. The transparent rigid container 2 is connected to the oxygen concentration detector 10 through the first solenoid valve 11. One end of the second solenoid valve 12 is connected to the resuscitator interface 15 through the air pipe 14. The connection between the resuscitator interface 15 and the transparent rigid container 2 is equipped with a one-way valve 16 through the air pipe 14. The gas pressure gauge 9 is connected to the transparent rigid container 2 through the second solenoid valve 12 and the one-way valve 16. A communication connection is formed, and the upper end surface of the transparent rigid container 2 is connected to a water inlet pipe 17. The inner lower end of the transparent rigid container 2 is laid with regulating water 19. The water inlet pipe 17 and the transparent rigid container 2 are connected to each other. The water inlet pipe 17 is used to introduce regulating water 19 into the transparent rigid container 2. A control switch 18 is installed on the upper surface of the side of the support plate 5 close to the tidal volume detector 8 by bolts, 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 staff to operate.

[0020] The method for detecting the dead space of the resuscitator of the present invention is as follows: 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 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 switch, fill the container with 100% oxygen, and when the pressure gauge reading is 1kPa, close the oxygen concentration detector 10, the first solenoid valve 11 and the gas flow meter 6 switch.

[0022] S3: Test the dead space of the system. First, connect the resuscitator and introduce an appropriate amount of air into the latex airbag 3. Open the second solenoid valve 12 to flush the exhalation channel with oxygen. Press the PEEP valve at least 50 times. Close the second solenoid valve 12 and 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 1kPa, the oxygen flow is turned off. The dead space of the system is calculated using the formula:

[0023] S4: Resuscitator Dead Space Test S41: Open the third solenoid valve 13, add water to the container, ensure that the compliance is 0.2L / kPa, and the expiratory resistance is 0.5kPa / (L / a), connect the resuscitator, and connect the resuscitator to 100% oxygen. Close the second solenoid valve 12. When the intake oxygen flow rate is 30L / min, press the PEEP valve at least 15 times. When the tidal volume reaches 600mL, 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 . Using the formula:

[0024] S42: Open the third solenoid valve 13, add water to the container, ensure that the compliance is 0.1L / kPa, and the expiratory resistance is 0.2kPa / (L / a), connect the resuscitator, and connect the resuscitator to 100% oxygen, close the second solenoid valve 12, when the intake oxygen flow rate is 5L / min, press the PEEP valve at least 50 times, when the tidal volume is 100mL, 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 . Using the formula:

[0025] In summary, according to the detection method of the resuscitator dead space detection device, there are According to the requirements, if V1≤6ml, that is:

[0026] The solution is: , and because the oxygen concentration F bO2The measured value cannot be lower than the oxygen concentration in the air, so there is ; like When, according to the formula:

[0027] Substituting into the formula for verification, we have:

[0028] Multiply by the tidal volume of 600ml to get:

[0029] That is, when F bo2 =22%, the value of the system dead space V1 is 7.5949ml; According to the previous derivation, when F bo2 =21.79%, V1=6ml, now verify F bo2 =22%, V1 also increases accordingly, which is in line with expectations.

[0030] The calculation method and principle of the present invention are based on the Bohr equation correction method and the constant breathing method, and have the following steps: S21: Using a constant breathing method, subjects inhale a gas mixture containing 0.1% CO, 20% O₂, and a balance of N₂ for 56 minutes. Initial exhaled air is discarded. After several minutes, when a steady state is considered achieved, exhaled air is collected for 2 minutes in a storage bag. A portion of the exhaled air is analyzed for the concentrations of the following gases: N₂, CO₂, and O₂.

[0031] S22: Based on the Bohr equation correction method: The ratio of physiological dead space to tidal volume (V) was calculated by comparing the alveolar carbon dioxide partial pressure (PaCO2) with the mixed expired carbon dioxide partial pressure (PECO2). D / V T ):

[0032] When 100% oxygen is used, the dead space volume can be indirectly derived from the change in the oxygen concentration of the expired gas.

[0033] S23:V e The simulated residual volume is the sum of the bag volume and the bag volume. This is calculated by measuring the bag volume (V) before rebreathing, correcting it for STPD, and using the following formula: The sum of the residual gas volume and the gas volume of the air storage bag

[0034] Where: V col = the volume of exhaled air in the storage bag; V sam = volume of gas used for analysis; T col = Time to collect exhaled breath min; The formula for calculating VO2 is:

[0035] Where F O2 = inspired gas O2 concentration fraction; FE CO2 = fractional exhaled CO2 concentration; FI CO2 = fractional inhaled CO2 concentration; By combining with the Bohr equation correction method, the final formula for calculating the system dead space is: .

[0036] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

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

2. A resuscitator dead space detection device 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 container (2) through the gas flow meter (6) and the tidal volume detector (8).

3. The dead space detection device of 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 dead space detection device of 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 dead space detection device of a resuscitator according to claim 1, characterized in that: The water inlet pipe (17) and the transparent rigid container (2) form a communicating connection, and the transparent rigid container (2) and the latex airbag (3) form an enclosing structure.

6. A detection method for a resuscitator dead space detection device according to any one of claims 1 to 5, characterized in that: It includes the following steps: S1: Inflate the airbag: 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 airbag (3) completely fills the container and presses the inner wall; S2: oxygen supply: close the second electromagnetic valve (12), open the oxygen concentration detector (10), the first electromagnetic valve (11) and the gas flow meter (6), and fill the container with 100% oxygen. When the pressure gauge reads 1 kPa, close the oxygen concentration detector (10), the first electromagnetic valve (11) and the gas flow meter (6); S3: Test the dead space of the system: first connect the resuscitator, let the atmosphere into the latex air bag (3), open the second solenoid valve (12) to flush the exhalation channel with oxygen, and press the PEEP valve at least 50 times; close the second solenoid valve (12), open the oxygen concentration detector (10) and the first solenoid valve (11), adjust the oxygen flow rate to 5L / min, and record the oxygen concentration reading F bo2 When the pressure gauge returns to 1kPa, the oxygen flow is turned off and the dead space of the system is calculated using the formula: ； S4: Resuscitator Dead Space Test S41: Open the third solenoid valve (13), add water to the container, ensure that the compliance is 0.2L / kPa, and the expiratory resistance is 0.5kPa / (L / a), connect the resuscitator, and connect the resuscitator to 100% oxygen, close the second solenoid valve (12), when the intake oxygen flow is 30L / min, press the PEEP valve at least 15 times, when the tidal volume is 600mL, close the second solenoid valve (12), open the oxygen concentration detector (10) and the first solenoid valve (11), and record the oxygen concentration reading F 1bo2 , using the formula: ； S42: Open the third solenoid valve (13), add water to the container, ensure that the compliance is 0.1L / kPa, and the expiratory resistance is 0.2kPa / (L / a), connect the resuscitator, and connect the resuscitator to 100% oxygen, close the second solenoid valve (12), when the intake oxygen flow is 5L / min, press the PEEP valve at least 50 times, when the tidal volume is 100mL, close the second solenoid valve (12), open the oxygen concentration detector (10) and the first solenoid valve (11), and record the oxygen concentration reading F 2bo2 , using the formula: 。

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