Special anesthetic gas mixing device for department of pediatrics

Abstract

The invention discloses a pediatric special anesthetic gas mixing device, and relates to the technical field of medical instruments, the pediatric special anesthetic gas mixing device comprises a shell, the shell comprises a base, a first shell and a second shell which are clamped with one another, three gas collection tanks for containing anesthetic gas are mounted in the shell, a fan is arranged at an opening in one end in a cavity of each gas collection tank, and the other end of each gas collection tank is provided with a gas outlet; an opening in one end of the gas collection tank is fixedly connected with a gas guide hose, and an automatic switch valve for controlling the anesthetic gas to be discharged is mounted on the gas guide hose. The three gas collecting tanks are used for containing three different anesthetic gases, the moving mechanism is accurately controlled to move and drive any two or three gas collecting tanks to rotate, and when the sensor module detects that the gas collecting tanks rotate, the automatic switching valve and the fan can be controlled to be started; at the moment, the anesthetic gas enters the mixing cavity through the gas guide hose to obtain mixed gas, so that the anesthetic gas is accurately mixed and proportioned, and the anesthetic mixing concentration is strictly controlled conveniently.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, in particular to a special pediatric anesthesia gas mixing device. Background Art

[0002] Anesthesia means using drugs or other methods to temporarily cause the body to lose sensation as a whole or in part in order to achieve painless surgical treatment. It is generally believed that anesthesia is a reversible functional inhibition of the central and peripheral nervous systems produced by drugs or other methods. The main characteristic of this inhibition is the loss of sensation, especially pain.

[0003] Anesthesia is usually achieved by mixing oxygen and anesthetics to form a mixed gas, which is then transmitted to the patient. This mixed gas is relatively simple to obtain for experienced anesthesiologists, but for inexperienced anesthesiologists, especially for younger patients, the required anesthetic gas mixture concentration needs to be strictly controlled. Inexperienced anesthesiologists find it difficult to control the mixed concentration and there is a certain risk. Therefore, it is necessary to provide a device that can easily control the anesthetic gas mixture concentration.

[0004] Referring to the Chinese patent, the patent name is: An anesthetic drug mixer that is easy to proportion (patent publication number: CN117085556A, publication date: 2023-11-21), comprising a fixed base, a mixing box is provided on the top of the fixed base, a stirring mechanism is provided inside the mixing box, and a liquid inlet pipe connected to the interior of the mixing box is fixedly provided on the top of the mixing box; a support ring, a rotating plate is rotatably connected to the inner end of the support ring; a mounting plate, a laser emitter is provided on the front side of the mounting plate, and a controller is fixedly provided on one side of the top of the mounting plate. The present invention can accurately control the proportion of different components of the anesthetic drug by loading different drugs into different drug tubes and controlling the liquid level of the drugs in different drug tubes, effectively avoiding the inaccurate addition of different components of the anesthetic drug due to operator error or lack of concentration, so that the proportion of each group of anesthetic drugs is more accurate, thereby making the mixed anesthetic drug more effective.

[0005] Compared with the above patents, although it is possible to perform relatively precise mixing and proportioning of multiple components, its mixing equipment is only suitable for the mixing and proportioning of liquid anesthetics, and cannot perform precise mixing and proportioning of anesthetic gases. It is difficult to control the concentration of mixed anesthetic gases. Mixed gas anesthesia is relatively common in clinical surgery, and the scope of use of its equipment is relatively limited. At the same time, the internal structure of the equipment is complex, which easily increases the failure rate.

[0006] To this end, the present invention provides a pediatric-specific anesthetic gas mixing device. Summary of the Invention

[0007] In response to the shortcomings of the existing technology, the present invention provides a pediatric anesthetic gas mixing device, which solves the problem of limited application scope caused by the fact that the equipment in the existing technology is only used for the mixing ratio of liquid anesthetics and is difficult to be applied to the ratio of anesthetic mixed gases.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a pediatric anesthetic gas mixing device, comprising a housing, the housing comprising a base, a first shell, and a second shell that are mutually engaged; three gas collecting tanks for containing anesthetic gas are installed within the housing; a blower is provided in the cavity of each gas collecting tank at one end opening thereof; a gas guide hose is fixedly connected to one end opening of the gas collecting tank, and an automatic on / off valve for controlling the discharge of anesthetic gas is installed on the gas guide hose; An arc-shaped groove is formed on the side of the first shell, and an inner plate is fixedly connected to the inner wall of the first shell corresponding to the outer side of the arc-shaped groove, and a moving mechanism for driving the gas collecting tank to rotate is provided on the inner side wall of the inner plate; An isolation plate is fixedly provided inside the second shell, and a mixing chamber is formed between the inner wall of the second shell and the isolation plate; The moving mechanism includes an arc-shaped plate, a push block fixed to the outer surface of the arc-shaped plate, and two clamping plates fixed to the outer surface of the arc-shaped plate. The push block passes through the arc-shaped groove and extends to the outside of the first shell. The outer surface of each gas collecting tank is movably connected to a bracket. The bracket includes a U-shaped plate, a first gear plate and a second gear plate fixedly connected to the upper and lower ends of the gas collecting tank respectively. A sensor module is installed on the side surface of the U-shaped plate. The sensor module includes a displacement sensor, an acceleration sensor and a controller. The fan and the automatic switch valve are electrically connected to the controller respectively.

[0009] Preferably, three slide grooves are provided on the end surface of the base, and the other end of the gas collecting tank is fixedly connected with an inflation pipe which passes through the slide grooves and extends to the outside of the base.

[0010] Preferably, the arc length of the arc-shaped groove is smaller than the cross-sectional perimeter of the first shell, a gap is provided between the inner plate and the first shell, and two clamping plates are slidably clamped at the top and bottom ends of the inner plate.

[0011] Preferably, the internal and external structures of the three gas collecting tanks are the same, and the three gas collecting tanks are distributed in an equidistant circular array, and the cross-sectional arc length of the arc plate is greater than the edge arc length formed between two adjacent gas collecting tanks.

[0012] Preferably, racks that can engage with the first gear disc and the second gear disc are fixedly provided at the upper and lower ends of the inner surface of the arc plate respectively, and a gap is provided between the U-shaped plate and the gas collecting tank, and the spacing is greater than the outer thickness of the sensor module.

[0013] Preferably, the first gear disc and the second gear disc have the same shape and size, and are rotatably connected to both ends of the U-shaped plate respectively.

[0014] Preferably, a common exhaust port is provided at the connection between the first toothed disc and the U-shaped plate, and a common inflation port is provided at the connection between the second toothed disc and the U-shaped plate.

[0015] Preferably, the exhaust port is fixedly sleeved on the outside of the air guide hose, and the inflation port is fixedly sleeved on the outside of the inflation tube.

[0016] Preferably, three motor boxes close to the gas collecting tank are fixedly installed on the inner wall of the base, and channels running through both sides of the motor box are opened on the side thereof, and forward and reverse motors are arranged in the motor box, and the forward and reverse motors are electrically connected to the controller.

[0017] Preferably, the motor box is also provided with a gear connected to one end of the output shaft of the forward and reverse motors, one side of the gear is engaged with a rack plate that passes through the channel, the rack plate is adapted to the shape of the channel, and the other end of the rack plate is fixedly connected to the outer surface of the U-shaped plate. Beneficial effects

[0018] The present invention provides a pediatric anesthetic gas mixing device. Compared with the prior art, it has the following advantages: 1. This pediatric anesthetic gas mixing device is equipped with three gas collecting tanks for holding three different anesthetic gases. The moving mechanism is precisely controlled to move and drive any two or three gas collecting tanks to rotate. When the sensor module detects the rotation of the gas collecting tank, it controls the automatic switch valve and blower to open. At this time, the anesthetic gas enters the mixing chamber through the gas guide hose to obtain a mixed gas. When the sensor module detects that the gas collecting tank is stationary, the gas guide hose is closed, achieving precise mixing and proportioning of the anesthetic gas, facilitating strict control of the anesthetic mixture concentration. 2. This pediatric anesthetic gas mixing device allows the anesthetic gas in the gas collecting tank to continue flowing into the mixing chamber under the action of the fan when being discharged, thereby rapidly mixing the mixed gas in the mixing chamber and finally discharging it through the mixed gas outlet for use. This eliminates the tedious process of adding an external mechanical mechanism to mix the anesthetic gas in the mixing chamber, making the discharge method of the anesthetic gas simpler and more convenient, and reducing the overall failure rate of the equipment. 3. This pediatric-specific anesthetic gas mixing device prevents the discharge of anesthetic gas in the gas collecting tank by moving the position of the gas collecting tank. When moving the gas collecting tank, the controller controls the forward and reverse motors to drive the gears to rotate and drive the rack plate to move along the channel. The other end of the rack plate drives the U-shaped plate and the entire bracket and the gas collecting tank to move synchronously until the first gear plate and the second gear plate are no longer engaged with the rack of the arc plate. At this time, the gas collecting tank is no longer subject to external force and is in a stationary state relative to the sensor module. Therefore, the fan and the automatic switch valve are both in the closed state and the anesthetic gas in the gas collecting tank will not be discharged, thereby improving the flexibility of the equipment during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a three-dimensional diagram of the structure of the housing of the present invention with the base facing upward; Figure 2 This is a schematic diagram of the installation structure of the gas collecting tank located inside the housing of the present invention; Figure 3 This is a schematic diagram of the internal structure of the housing with the base facing downwards according to the present invention; Figure 4 This is a distribution diagram of the three gas collecting tanks in the housing of the present invention; Figure 5 For the present invention Figure 4 and a cross-sectional view of the interior of one of the gas collecting tanks; Figure 6 This is an exploded view of the motor box and the base mounted on the base of the present invention; Figure 7 This is a schematic diagram of the support structure installed outside the gas collecting tank of the present invention; Figure 8 This is a disassembled diagram of the first shell and the second shell of the present invention.

[0020] In the figure: 1, outer shell; 11, base; 111, slide groove; 12, first shell; 121, arc groove; 122, inner plate; 13, second shell; 131, mixed gas outlet; 132, isolation plate; 2. Gas collecting tank; 21. Fan; 3. Air guide hose; 31. Automatic switch valve; 32. Inflation tube; 4. Moving mechanism; 41. Arc plate; 42. Push block; 43. Clamping plate; 5. Bracket; 51. U-shaped plate; 511. Sensor module; 52. First gear disc; 521. Exhaust port; 53. Second gear disc; 531. Inflatable port; 6. Motor box; 61. Channel; 62. Gear; 63. Rack plate. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] See also Figure 1-5 The present invention provides a technical solution: a pediatric anesthetic gas mixing device, comprising a shell 1, the shell 1 comprising a base 11, a first shell 12 and a second shell 13 that are mutually clamped, and the three can be disassembled. Three gas collecting tanks 2 for containing anesthetic gas are installed in the shell 1, each gas collecting tank 2 contains a type of anesthetic gas, and a blower 21 is provided at an opening at one end of the cavity of each gas collecting tank 2. When the blower 21 is turned on, it helps to discharge the anesthetic gas inside the gas collecting tank 2 outward, and a gas guide hose 3 is fixedly connected to the opening at one end of the gas collecting tank 2. An automatic switch valve 31 for controlling the discharge of anesthetic gas is installed on the gas guide hose 3. The automatic switch valve 31 divides one end of the gas guide hose 3 into an open state and a closed state. When the valve of the automatic switch valve 31 is adjusted to the open state, the anesthetic gas in the gas collecting tank 2 can be passed into the mixing chamber along the gas guide hose 3 and mixed by the blower 21; Among them, three slide grooves 111 are opened on the end face of the base 11, and the other end of the gas collecting tank 2 is fixedly connected with an inflation tube 32 that passes through the slide groove 111 and extends to the outside of the base 11. Anesthetic gas can be added to the gas collecting tank 2 along the inflation tube 32. It can be seen from the figure that the three slide grooves 111 are all facing the center of the base 11. The inflation tube 32 moves along the slide groove 111 toward or away from the center of the base 11. The movement of the inflation tube 32 can drive the bracket 5 and the gas collecting tank 2 to move as a whole.

[0023] See also Figure 1 and Figure 3 An arc-shaped groove 121 is provided on the side of the first shell 12, and an inner plate 122 is fixedly connected to the inner wall of the first shell 12 corresponding to the outer side of the arc-shaped groove 121. The arc length of the arc-shaped groove 121 is smaller than the cross-sectional circumference of the first shell 12, and a gap is provided between the inner plate 122 and the first shell 12. As can be seen from the figure, the cross-section of the first shell 12 is circular, so the cross-sectional curvature of the first shell 12 is 360°, while the curvature of the arc-shaped groove 121 is slightly less than 360°.

[0024] See also Figure 2An isolation plate 132 is fixedly provided inside the second shell 13, and a mixing chamber is formed between the inner wall of the second shell 13 and the isolation plate 132. The other ends of the three gas guide hoses 3 all pass through the isolation plate 132 and extend into the mixing chamber. Any mixed gas can be obtained by passing the anesthetic gases in any two gas collecting tanks 2 into the mixing chamber, and another mixed gas can be obtained by passing the anesthetic gases in three gas collecting tanks 2 into the mixing chamber.

[0025] See also Figure 2-4 , the inner wall of the inner plate 122 is provided with a moving mechanism 4 for driving the gas collecting tank 2 to rotate. The moving mechanism 4 includes a curved plate 41, a push block 42 fixed to the outer surface of the curved plate 41, and two clamping plates 43 fixed to the outer surface of the curved plate 41. The push block 42 passes through the curved groove 121 and extends to the outside of the first shell 12. The two clamping plates 43 are slidably clamped at the top and bottom ends of the inner plate 122. The curved plate 41 can be driven to rotate by holding the push block 42 and sliding along the curved groove 121. During the rotation of the curved plate 41, the two clamping plates 43 on its outer surface always slide and clamp on the inner plate 122, so that the curved plate 41 can rotate stably along the inner wall of the inner plate 122, and the rotation angle of the push block 42 is slightly smaller than the curvature of the curved groove 121; The rotation of the push block 42 and the arc-shaped plate 41 can also be precisely mechanically controlled by a rotator. When in use, the rotating part of the rotator is connected to the push block 42. The rotators currently available on the market can precisely control their rotation angle and speed through a built-in chip, which helps to accurately rotate the rotation angle and speed of the gas collecting tank 2, thereby precisely controlling the displacement of the anesthetic gas. Among them, the internal and external structures of the three gas collecting tanks 2 are the same, and the three gas collecting tanks 2 are distributed in an equidistant circular array. The cross-sectional arc length of the arc plate 41 is greater than the edge arc length formed between two adjacent gas collecting tanks 2. Therefore, when the arc plate 41 rotates, it can simultaneously drive the two gas collecting tanks 2 to rotate synchronously and release anesthetic gas into the mixing chamber.

[0026] See also Figure 4 and Figure 7 The outer surface of each gas collecting tank 2 is movably connected to a bracket 5, which includes a U-shaped plate 51, a first toothed disc 52 and a second toothed disc 53 fixedly connected to the upper and lower ends of the gas collecting tank 2 respectively, and a sensor module 511 is installed on the side surface of the U-shaped plate 51. The sensor module 511 includes a displacement sensor, an acceleration sensor and a controller. The displacement sensor and the acceleration sensor are both electrically connected and controlled by the controller. The fan 21 and the automatic switch valve 31 are electrically connected to the controller respectively. When the gas collecting tank 2 rotates, the displacement sensor can quickly identify it and transmit the rotation signal to the controller. At this time, the controller immediately starts the fan 21 and the automatic switch valve 31, thereby discharging the anesthetic gas in the gas collecting tank 2 along the gas guide hose 3 to the mixing chamber; When the gas collecting tank 2 accelerates or decelerates, the acceleration sensor detects the acceleration and transmits the signal to the controller. The controller controls the speed of the fan 21 according to the acceleration, and adjusts the anesthetic gas discharge speed according to the speed of the gas collecting tank 2, thereby controlling the anesthetic gas discharge volume. Under the action of the fan 21, the anesthetic gas continues to flow after flowing into the mixing chamber, thereby driving the mixed gas in the mixing chamber to be quickly mixed and finally discharged through the mixed gas outlet 131 for use, eliminating the tedious process of mixing the anesthetic gas in the mixing chamber by adding an external mechanical mechanism. Among them, racks that can mesh with the first toothed disc 52 and the second toothed disc 53 are fixedly provided at the upper and lower ends of the inner surface of the arc plate 41 respectively. When the arc plate 41 rotates, it drives the push block 42 and the clamping plate 43 to rotate synchronously, and then drives the gas collecting tank 2 to rotate synchronously. Since the U-shaped plate 51 is stationary at this time, the gas collecting tank 2 is in a rotating state relative to the U-shaped plate 51. At this time, the sensor module 511 can detect that the gas collecting tank 2 is in a moving state and start the automatic switch valve 31 and the fan 21 through the controller. A gap is provided between the U-shaped plate 51 and the gas collecting tank 2, and the spacing is greater than the outer thickness of the sensor module 511, so that there is still a gap between the sensor module 511 shell and the gas collecting tank 2 to prevent the two from touching and affecting the detection accuracy of the sensor; Among them, the first toothed disc 52 and the second toothed disc 53 have the same shape and size. The first toothed disc 52 and the second toothed disc 53 are respectively rotatably connected to the two ends of the U-shaped plate 51. The connection between the first toothed disc 52 and the U-shaped plate 51 is provided with the same exhaust port 521, and the connection between the second toothed disc 53 and the U-shaped plate 51 is provided with the same inflation port 531. The exhaust port 521 is fixedly sleeved on the outside of the air guide hose 3, and the inflation port 531 is fixedly sleeved on the outside of the inflation tube 32.

[0027] See also Figure 6-8, three motor boxes 6 close to the gas collecting tank 2 are fixedly installed on the inner wall of the base 11, and the side of the motor box 6 is provided with a channel 61 running through both sides thereof, and a forward and reverse motor is provided in the motor box 6, and the forward and reverse motor is electrically connected to the controller, and a gear 62 connected to one end of the output shaft of the forward and reverse motor is also provided in the motor box 6, and one side of the gear 62 is engaged with a rack plate 63 running through the channel 61, and the rack plate 63 is adapted to the shape of the channel 61, and the other end of the rack plate 63 is fixedly connected to the outer surface of the U-shaped plate 51. When the gas in one of the gas collecting tanks 2 is not needed, it can be discharged through The position of the gas collecting tank 2 is adjusted to prevent the discharge of anesthetic gas in the gas collecting tank 2. During adjustment, the controller controls the forward and reverse motors to drive the gear 62 to rotate and drive the rack plate 63 to move along the channel 61. The other end of the rack plate 63 drives the U-shaped plate 51 and the entire bracket 5 and the gas collecting tank 2 to move synchronously until the first gear plate 52 and the second gear plate 53 are no longer engaged with the rack of the arc plate 41. At this time, the gas collecting tank 2 is not subject to external force and is in a stationary state relative to the sensor module 511. Therefore, the fan 21 and the automatic switch valve 31 are both in a closed state and the anesthetic gas in the gas collecting tank 2 will not be discharged.

[0028] The working principle is that the arc plate 41 can be driven to rotate by holding the push block 42 and sliding it along the arc groove 121, or by installing a rotator to control the push block 42 and the arc plate 41 to rotate at a precise speed. During the rotation of the arc plate 41, the two clamping plates 43 on its outer surface always slide and engage on the inner plate 122, so that the arc plate 41 can rotate stably along the inner wall of the inner plate 122. When the gas in one of the gas collecting tanks 2 is not needed, the controller controls the forward and reverse motors to drive the gear 62 to rotate and drive the rack plate 63 to move along the channel 61. The other end of the rack plate 63 drives the U-shaped plate 51 and the entire bracket 5 and the gas collecting tank 2 to move synchronously until the first toothed disc 52 and the second toothed disc 53 are no longer engaged with the rack of the arc plate 41. At this time, the gas collecting tank 2 is not subject to external force and is in a stationary state relative to the sensor module 511. When the arc-shaped plate 41 rotates, it drives the push block 42 and the clamping plate 43 to rotate synchronously, thereby driving the gas collecting tank 2 to rotate synchronously. Since the U-shaped plate 51 is stationary at this time, the gas collecting tank 2 is in a rotating state relative to the U-shaped plate 51. At this time, the sensor module 511 can detect that the gas collecting tank 2 is in a moving state and control the controller to start the automatic switch valve 31 and the blower 21, thereby discharging the anesthetic gas in the gas collecting tank 2 along the gas guide hose 3 to the mixing chamber for mixing; When the gas collecting tank 2 rotates, the displacement sensor can quickly identify it and transmit the rotation signal to the controller, which immediately starts the blower 21 and the automatic switch valve 31, thereby discharging the anesthetic gas in the gas collecting tank 2 along the gas guide hose 3 to the mixing chamber; When the gas collecting tank 2 accelerates or decelerates, the acceleration sensor detects it and transmits the signal to the controller. The controller controls the speed of the fan 21 according to the acceleration, adjusts the anesthetic gas discharge speed according to the speed of the gas collecting tank 2, and thus controls the anesthetic gas discharge volume. Under the action of the fan 21, the anesthetic gas will continue to flow after flowing into the mixing chamber, thereby driving the mixed gas in the mixing chamber to be quickly mixed, and finally discharged along the mixed gas outlet 131 for use, eliminating the tedious process of adding an external mechanical mechanism to mix the anesthetic gas in the mixing chamber.

[0029] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0030] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0031] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A pediatric anesthetic gas mixing device, comprising a housing (1), characterized in that: The housing (1) comprises a base (11), a first shell (12) and a second shell (13) which are connected to each other. Three gas collecting tanks (2) for containing anesthetic gas are installed in the housing (1). A blower (21) is provided in the cavity of each gas collecting tank (2) at an opening at one end thereof. A gas guide hose (3) is fixedly connected to the opening at one end of the gas collecting tank (2). An automatic switch valve (31) for controlling the discharge of anesthetic gas is installed on the gas guide hose (3). An arc-shaped groove (121) is provided on the side of the first shell (12), and an inner plate (122) is fixedly connected to the inner wall of the first shell (12) corresponding to the outer side of the arc-shaped groove (121), and a moving mechanism (4) for driving the gas collecting tank (2) to rotate is provided on the inner side wall of the inner plate (122); An isolation plate (132) is fixedly provided inside the second shell (13), and a mixing chamber is formed between the inner wall of the second shell (13) and the isolation plate (132); The moving mechanism (4) includes an arc-shaped plate (41), a push block (42) fixed to the outer surface of the arc-shaped plate (41), and two clamping plates (43) fixed to the outer surface of the arc-shaped plate (41). The push block (42) passes through the arc-shaped groove (121) and extends to the outside of the first shell (12). The outer surface of each gas collecting tank (2) is movably connected to a bracket (5). The bracket (5) comprises a U-shaped plate (51), a first toothed disc (52) and a second toothed disc (53) respectively fixedly connected to the upper and lower ends of the gas collecting tank (2); a sensor module (511) is mounted on the side surface of the U-shaped plate (51); the sensor module (511) comprises a displacement sensor, an acceleration sensor and a controller; the fan (21) and the automatic switch valve (31) are respectively electrically connected to the controller.

2. The pediatric anesthetic gas mixing device according to claim 1, characterized in that: The end surface of the base (11) is provided with three slide grooves (111), and the other end of the gas collecting tank (2) is fixedly connected with an air filling pipe (32) that passes through the slide grooves (111) and extends to the outside of the base (11).

3. The pediatric anesthetic gas mixing device according to claim 1, characterized in that: The arc length of the arc groove (121) is smaller than the cross-sectional perimeter of the first shell (12), a gap is provided between the inner plate (122) and the first shell (12), and two clamping plates (43) are slidably clamped at the top and bottom ends of the inner plate (122).

4. The pediatric anesthetic gas mixing device according to claim 1, characterized in that: The internal and external structures of the three gas collecting tanks (2) are identical, and the three gas collecting tanks (2) are distributed in an equidistant circular array, and the cross-sectional arc length of the arc plate (41) is greater than the edge arc length formed between two adjacent gas collecting tanks (2).

5. The pediatric anesthetic gas mixing device according to claim 1, characterized in that: Racks that can mesh with the first toothed disc (52) and the second toothed disc (53) are fixedly provided at the upper and lower ends of the inner surface of the arc-shaped plate (41), respectively. A gap is provided between the U-shaped plate (51) and the gas collecting tank (2), and the gap is greater than the outer thickness of the sensor module (511).

6. The pediatric anesthetic gas mixing device according to claim 1, characterized in that: The first toothed disc (52) and the second toothed disc (53) have the same shape and size, and the first toothed disc (52) and the second toothed disc (53) are rotatably connected to both ends of the U-shaped plate (51) respectively.

7. The pediatric anesthetic gas mixing device according to claim 1, characterized in that: A common exhaust port (521) is provided at the connection between the first toothed disc (52) and the U-shaped plate (51), and a common inflation port (531) is provided at the connection between the second toothed disc (53) and the U-shaped plate (51).

8. The pediatric anesthetic gas mixing device according to claim 7, characterized in that: The exhaust port (521) is fixedly sleeved on the outside of the air guide hose (3), and the inflation port (531) is fixedly sleeved on the outside of the inflation tube (32).

9. The pediatric anesthetic gas mixing device according to claim 1, characterized in that: Three motor boxes (6) close to the gas collecting tank (2) are fixedly mounted on the inner wall of the base (11), and the sides of the motor boxes (6) are provided with channels (61) running through both sides thereof. The motor boxes (6) are provided with forward and reverse motors, and the forward and reverse motors are electrically connected to the controller.

10. The pediatric anesthetic gas mixing device according to claim 9, characterized in that: The motor box (6) is further provided with a gear (62) connected to one end of the output shaft of the forward and reverse motors. One side of the gear (62) is engaged with a rack plate (63) that passes through the channel (61). The rack plate (63) is adapted in shape to the channel (61), and the other end of the rack plate (63) is fixedly connected to the outer surface of the U-shaped plate (51).

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