Flow calibration device of electric gastric lavage machine

Abstract

The invention relates to a flow calibration device of an electric gastric lavage machine, which comprises a simulated stomach, a liquid medicine barrel, a waste liquid barrel, a simulated stomach support and a three-way joint, the three-way connector comprises a second connector and a first connector used for being detachably connected with a liquid outlet of the stomach tube, a third connector is arranged on the side face of the three-way connector and connected with a liquid extraction tube extending to the bottom of the simulated stomach, a liquid outlet switch valve is arranged at the second connector, and a liquid extraction switch valve is arranged at the third connector. A liquid medicine buffer device used for reducing the liquid outlet speed of the second connector is arranged between the second connector and the bottom of the simulated stomach. The technical problems that in the prior art, liquid can impact the simulated stomach after being pumped out through a stomach tube, accurate weighing of the simulated stomach is affected, and then precision calibration of a flow sensor is affected are solved.

Description

Technical Field

[0001] The invention relates to the field of measurement calibration, and in particular to a flow calibration device for an electric gastric lavage machine. Background Art

[0002] An electric gastric lavage machine is a commonly used medical device for rescuing patients with food poisoning. It is used to perform gastric lavage on patients. Gastric lavage can quickly remove gastric contents, reduce the absorption of poisons and irritate the patient's stomach.

[0003] The working principle of an electric gastric lavage machine is that it first fills a liquid tank with gastric lavage fluid, draws it through a gastric tube, and delivers it to the patient's stomach. After a brief pause, the waste gastric fluid is withdrawn through the same gastric tube and discharged into a waste liquid tank through a drainage tube. The electric gastric lavage machine includes a flow sensor to detect the flow of gastric lavage fluid. Flow rate is a key technical indicator of medical electric gastric lavage machines, and its accuracy plays a decisive role in the success of patient rescue.

[0004] Therefore, a flow calibration device is needed to calibrate the flow sensor of the electric gastric lavage machine. Existing flow calibration devices, such as the "A medical electric gastric lavage machine flow monitoring device" disclosed in Chinese patent CN219721483U, include a liquid medicine barrel, a simulated stomach and a waste liquid barrel. A weighing sensor is provided on the lower side of the simulated stomach. When in use, the suction tube of the electric gastric lavage machine is connected to the liquid medicine barrel, the gastric tube of the electric gastric lavage machine is connected to the simulated stomach, and the discharge tube of the electric gastric lavage machine is connected to the waste liquid barrel.

[0005] During operation, the electric gastric lavage machine draws the liquid from the medicine barrel into a simulated stomach, then pumps the liquid from the simulated stomach into a waste liquid barrel. A weighing sensor detects the weight change of the simulated stomach and calculates the flow rate based on the time, thereby calibrating the flow sensor. Problems with existing flow calibration devices include: when the electric gastric lavage machine uses a pump to pump the liquid from the medicine barrel into the simulated stomach, the liquid has a certain initial velocity. At this initial velocity, the liquid exerts an impact force on the simulated stomach, which affects the reading of the weighing sensor and, in turn, affects the accuracy of the flow sensor calibration. Furthermore, in the prior art, the liquid from the medicine barrel needs to be pumped through the simulated stomach into the waste liquid barrel. During the long calibration process, the liquid barrel needs to be frequently replenished and the waste liquid in the waste liquid barrel needs to be frequently discarded, which is very inconvenient. Summary of the Invention

[0006] The purpose of the present invention is to provide a flow calibration device for an electric gastric lavage machine to solve the technical problem in the prior art that liquid pumped out through a gastric tube will impact the simulated stomach, affecting the accurate weighing of the simulated stomach, and further affecting the accuracy calibration of the flow sensor.

[0007] In order to solve the above technical problems, the technical solution of a flow calibration device for an electric gastric lavage machine in the present invention is as follows: A flow calibration device for an electric gastric lavage machine comprises a simulated stomach connected to a gastric tube of the electric gastric lavage machine, a medicine liquid bucket connected to a liquid extraction tube of the electric gastric lavage machine, and a waste liquid bucket connected to a liquid outlet tube of the electric gastric lavage machine, and also comprises a simulated stomach support, a weighing sensor is arranged between the simulated stomach support and the simulated stomach, the flow calibration device also comprises a three-way joint, the three-way joint comprises a first interface for detachably connecting to a liquid outlet of the gastric tube, the three-way joint also comprises a second interface arranged downwardly opposite to the first interface, a third interface is arranged on the side of the three-way joint, the third interface is connected to a liquid extraction tube extending to the bottom of the simulated stomach, the height of the second interface is higher than the height of the liquid inlet of the liquid extraction tube, a liquid outlet switch valve is arranged at the second interface, and a liquid extraction switch valve is arranged at the third interface, when the three-way joint is in a positive pressure environment, the liquid outlet switch valve is opened and the liquid extraction switch valve is closed; when the three-way joint is in a negative pressure environment, the liquid outlet switch valve is closed and the liquid extraction switch valve is opened, and a medicine liquid buffer device for slowing down the liquid outlet speed of the second interface is arranged between the second interface and the bottom of the simulated stomach.

[0008] Furthermore, the liquid outlet switch valve includes a liquid outlet valve plate that can move up and down, and the bottom of the second interface has a second interface sealing mating portion for sealing with the liquid outlet valve plate. A liquid outlet valve plate reset spring is arranged between the upper side of the liquid outlet valve plate and the second interface. When the three-way joint is in a negative pressure environment, the liquid outlet valve plate moves upward and seals with the second interface sealing mating portion. When the three-way joint is in a positive pressure environment, an annular second interface liquid outlet is formed between the liquid outlet valve plate and the bottom of the second interface.

[0009] Furthermore, the liquid pumping switch valve includes a liquid pumping valve plate that can move left and right, a valve seat with an annular structure is provided in the third interface, a third interface sealing mating part for sealing with the liquid pumping valve plate is provided on the valve seat, and a liquid pumping valve plate reset spring is provided between the right side of the liquid pumping valve plate and the valve seat. When the three-way joint is in a positive pressure environment, the liquid pumping valve plate moves to the right and seals with the third interface sealing mating part, forming an annular third interface liquid pumping port between the liquid pumping valve plate and the valve seat.

[0010] Furthermore, when the three-way joint is in a negative pressure environment, the liquid extraction valve plate is located in the inner cavity of the three-way joint between the first interface and the second interface.

[0011] Furthermore, the bottom height of the waste liquid barrel is higher than the top height of the medicine liquid barrel, and the bottom of the waste liquid barrel is connected with the top of the medicine liquid barrel through a connecting pipe.

[0012] Furthermore, the drug solution buffer device is connected to the simulated stomach support through a device bracket.

[0013] Furthermore, the device bracket includes a left bracket and a right bracket, and the left bracket and the right bracket both include a vertically arranged bracket rod, and the bracket rod includes an upper bracket rod and a lower bracket rod that can float up and down relative to the upper bracket rod. A bracket rod floating spring is arranged between the lower bracket rod and the upper bracket rod, and the lower bracket rod is connected to the medicine liquid buffer device.

[0014] Furthermore, the medicine liquid buffer device includes a device barrel, the upper end of the device barrel is a device barrel liquid inlet arranged corresponding to the second interface, the lower end of the device barrel is a device barrel liquid outlet, and at least one medicine liquid buffer unit is arranged in the device barrel between the device barrel liquid inlet and the device barrel liquid outlet.

[0015] Furthermore, the medicine buffer unit includes an upper unit and a lower unit, the upper unit includes a left-side first guide plate and a right-side first guide plate arranged at intervals on the left and right, the left-side first guide plate gradually extends downward from left to right, and the right-side first guide plate gradually extends downward from right to left; the lower unit includes a left-side second guide plate and a right-side second guide plate arranged at intervals on the left and right, the left-side second guide plate gradually extends downward from right to left, and the right-side second guide plate gradually extends downward from left to right, the bottom of the left-side first guide plate faces the left-side second guide plate, and the bottom of the right-side first guide plate faces the right-side second guide plate.

[0016] Furthermore, the second interface is located on the upper center side of the left first guide plate and the left second guide plate of the uppermost liquid medicine buffer unit.

[0017] The beneficial effects of the present invention are as follows: in order to prevent the medicine from being directly sprayed out through the gastric tube and affecting the readings of the weighing sensor, it is necessary to raise the liquid outlet height of the gastric tube so that a medicine buffer device can be set between the second interface and the bottom of the simulated stomach to buffer the liquid outlet speed. However, when the height of the second interface is raised, the product faces a new problem, that is, it is not easy to pump the medicine in the simulated stomach into the waste liquid barrel. For this reason, a three-way joint is used in the present invention to solve this problem. A liquid extraction tube that can reach the bottom of the simulated stomach is connected at the third interface. When the medicine in the medicine barrel needs to be pumped into the simulated stomach, the three-way joint is in a positive pressure environment. At this time, the liquid extraction switch valve is closed, and the liquid discharge switch valve is opened. The medicine is pumped into the simulated stomach through the second interface and the medicine buffer device; when the medicine in the simulated stomach needs to be pumped into the waste liquid barrel, the three-way joint is in a negative pressure environment. At this time, the liquid discharge switch valve is closed, and the liquid extraction switch valve is opened. Therefore, the medicine at the bottom of the simulated stomach can be smoothly pumped into the waste liquid barrel. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown in an illustrative and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 It is a structural schematic diagram of an embodiment of the present invention; Figure 2 yes Figure 1 A top view of the simulated stomach, device support, and drug buffer device; Figure 3 yes Figure 1 Schematic diagram of the structure of the Chinese medicine liquid buffer device; Figure 4 yes Figure 1 A magnified view of point A in the figure; Figure 5 yes Figure 1 Enlarged view of point B in FIG. 1. Liquid tank; 2. Liquid extraction tube; 3. Electric gastric lavage machine; 4. Gastric tube; 5. Liquid discharge tube; 6. Waste liquid tank; 7. Connecting tube; 8. Weighing sensor; 9. Simulated stomach support; 10. Simulated stomach; 11. Left bracket; 12. Bracket rod; 13. Device bracket; 14. Liquid buffer unit; 15. Right bracket; 16. Liquid buffer device; 17. Liquid extraction tube; 18. Device barrel; 19. Left first guide plate; 20. Right first guide plate; 21. Liquid inlet of the device barrel; 22. Liquid outlet of the device cylinder; 23. Second guide plate on the left side; 24. Second guide plate on the right side; 25. Upper support rod; 26. Lower support rod; 27. Support rod floating spring; 28. Three-way connector; 29. First interface; 30. Second interface; 31. Third interface; 32. Liquid outlet valve plate; 33. Liquid outlet valve plate reset spring; 34. Second interface sealing mating part; 35. Second interface liquid outlet; 36. Valve seat; 37. Liquid extraction valve plate; 38. Liquid extraction valve plate reset spring. DETAILED DESCRIPTION

[0019] To facilitate understanding of the present invention, the present invention will be described in more detail below with reference to the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present invention.

[0020] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0021] An embodiment of a flow calibration device for an electric gastric lavage machine of the present invention is as follows: Figures 1 to 5 As shown: Before describing the structure of the flow calibration device, a brief introduction to the electric gastric lavage machine in the prior art is first given. The electric gastric lavage machine 3 includes a gastric lavage machine body, to which a liquid extraction tube 17, a stomach tube 4 and a liquid outlet tube 5 are connected.

[0022] The flow calibration device includes a simulated stomach 10, a medicine liquid barrel 1 and a waste liquid barrel 6. The simulated stomach is used to be connected to the gastric tube 4 of the electric gastric lavage machine, the medicine liquid barrel is used to be connected to the liquid extraction tube 17 of the electric gastric lavage machine, and the waste liquid barrel is used to be connected to the liquid outlet tube 5 of the electric gastric lavage machine. The electric gastric lavage machine can use the liquid extraction tube to pump the medicine liquid in the medicine liquid barrel into the simulated stomach 10 through the gastric tube, and can also use the gastric tube 4 to pump the medicine liquid in the simulated stomach into the waste liquid barrel 6 through the liquid outlet tube.

[0023] The flow calibration device further includes a simulated stomach support 9 , on which the simulated stomach is arranged via a weighing sensor 8 .

[0024] In the present invention, the bottom height of the waste liquid barrel 6 is higher than the top height of the medicine liquid barrel 1, and the bottom of the waste liquid barrel is connected to the top of the medicine liquid barrel 1 through a connecting pipe 7. Since the medicine liquid in the present invention does not pass through a real stomach, it is not contaminated when passing through the simulated stomach. Therefore, the medicine liquid in the waste liquid barrel can be reused. In the present invention, the height of the waste liquid barrel is raised, and the medicine liquid pumped into the waste liquid barrel can return to the medicine liquid barrel by gravity, realizing the recycling of the medicine liquid, avoiding the need to repeatedly add medicine liquid to the medicine liquid barrel and the inconvenience of handling the waste liquid in the waste liquid barrel.

[0025] The flow calibration device also includes a three-way connector 28, which includes a first interface 29 and a second interface 30 correspondingly arranged above and below. A third interface 31 is provided on the side of the three-way connector. The first interface 29 is used to be detachably connected to the liquid outlet of the gastric tube 4. In this embodiment, the first interface 29 is detachably connected to the end of the gastric tube by being sleeved on the end of the gastric tube.

[0026] The third interface 31 is connected to a liquid extraction tube 17 extending to the bottom of the simulated stomach. The height of the second interface 30 is higher than the height of the liquid inlet of the liquid extraction tube 17. A liquid outlet switch valve is provided at the second interface, and a liquid extraction switch valve is provided at the third interface. When the three-way joint is in a positive pressure environment, the liquid outlet switch valve is opened and the liquid extraction switch valve is closed; when the three-way joint is in a negative pressure environment, the liquid outlet switch valve is closed and the liquid extraction switch valve is opened. A liquid buffer device for slowing down the liquid discharge speed of the second interface is provided between the second interface and the bottom of the simulated stomach. A positive pressure environment in the three-way joint refers to the process in which the electric gastric lavage machine pumps the liquid in the liquid barrel into the simulated stomach through the gastric tube; a negative pressure environment in the three-way joint refers to the process in which the electric gastric lavage machine pumps the liquid in the simulated stomach into the waste liquid barrel through the gastric tube and the liquid outlet tube.

[0027] The liquid outlet switch valve includes a liquid outlet valve plate 32 that can move up and down, and the bottom of the second interface has a second interface sealing mating part 34 for sealing with the liquid outlet valve plate. A liquid outlet valve plate reset spring 33 is arranged between the upper side of the liquid outlet valve plate 32 and the second interface. When the three-way joint is in a negative pressure environment, the liquid outlet valve plate 32 overcomes the force of the liquid outlet valve plate reset spring and moves upward to seal with the second interface sealing mating part 34. When the three-way joint is in a positive pressure environment, an annular second interface liquid outlet 35 is formed between the liquid outlet valve plate and the bottom of the second interface.

[0028] The liquid pumping switch valve includes a liquid pumping valve plate 37 that can move left and right, a valve seat 36 with an annular structure is provided in the third interface, and a third interface sealing matching part for sealing with the liquid pumping valve plate is provided on the valve seat 36. A liquid pumping valve plate reset spring 38 is provided between the right side of the liquid pumping valve plate and the valve seat. When the three-way joint is in a positive pressure environment, the liquid pumping valve plate overcomes the force of the liquid pumping valve plate reset spring and moves to the right to seal with the third interface sealing matching part, forming an annular third interface liquid pumping port between the liquid pumping valve plate and the valve seat.

[0029] When the three-way joint is in a negative pressure environment, the liquid extraction valve plate moves to the left into the inner cavity of the three-way joint between the first interface and the second interface. That is to say, at this time the liquid extraction valve plate is directly below the first interface, so that a larger liquid inlet space is formed between the liquid extraction valve plate and the valve seat.

[0030] The medicine liquid buffer device is connected to the simulated stomach support 9 through the device bracket 13. In this way, when the medicine liquid is discharged through the second interface 30, the force is transmitted to the simulated stomach support 9 through the medicine liquid buffer device, and will not directly impact the simulated stomach, thereby avoiding the problem of unstable readings of the weighing sensor caused by the impact.

[0031] The device bracket includes a left bracket and a right bracket. Both the left bracket and the right bracket include a vertically arranged bracket rod 12. The bracket rod includes an upper bracket rod and a lower bracket rod 26 that can float up and down relative to the upper bracket rod 25. A bracket rod floating spring 27 is arranged between the lower bracket rod 26 and the upper bracket rod 25. The lower bracket rod 26 is connected to the drug liquid buffer device 16. The left bracket 11 and the right bracket 15 together form an "concave" shape.

[0032] The bottom of the medicine liquid buffer device is spaced apart from the bottom of the simulated stomach 10. The reason why the lower support rod is floatingly connected to the upper support rod through the support rod floating spring is that when the medicine liquid is discharged through the second interface and hits the medicine liquid buffer device, the medicine liquid buffer device can move downward to a certain extent, thereby achieving a certain buffering. When the second interface stops discharging liquid, the support rod floating spring resets, and the medicine liquid buffer device floats upward. By utilizing inertia, the medicine in the medicine liquid buffer device can fall smoothly and quickly into the simulated stomach, thereby avoiding accumulation of liquid in the medicine liquid buffer device and affecting the calibration accuracy.

[0033] The liquid medicine buffer device includes a device tube 18. The upper end of the device tube 18 is a device tube liquid inlet 21 corresponding to the second interface 30, and the lower end of the device tube is a device tube liquid outlet 22. The device tube liquid outlet is spaced apart from the bottom of the simulated stomach. At least one liquid medicine buffer unit 14 is provided in the device tube between the device tube liquid inlet and the device tube liquid outlet. The liquid medicine buffer unit includes an upper unit and a lower unit. The upper unit includes a left first guide plate 19 and a right first guide plate 20 spaced apart from each other. The left first guide plate extends gradually downward from left to right and the right first guide plate extends gradually downward from right to left. The lower unit includes a left second guide plate 23 and a right second guide plate 24 spaced apart from each other. The left second guide plate extends gradually downward from right to left and the right second guide plate extends gradually downward from left to right. The bottom of the left first guide plate faces the left second guide plate, and the bottom of the right first guide plate faces the right second guide plate.

[0034] The second guide plate on the left and the second guide plate on the right are in the shape of an "eight", the first guide plate on the left and the first guide plate on the right are in the shape of an inverted "eight", and the second interface is located on the upper center side of the first guide plate on the left and the second guide plate on the left of the uppermost liquid medicine buffer unit.

[0035] During use, the electric gastric lavage machine pumps the medicine in the medicine barrel into the gastric tube, and then discharges it through the second interface of the three-way joint. During this process, the third interface is closed by positive pressure. After the medicine is discharged through the second interface, it hits the first guide plate on the left and the first guide plate on the right of the top medicine buffer unit, achieving a first-level deceleration, and then flows through the first guide plate on the left and the first guide plate on the right to the second guide plate on the left and the second guide plate on the right to achieve a second-level deceleration. Of course, as the liquid level in the simulated stomach rises, the number of medicine buffer units that the subsequent medicine passes through will decrease, but there is still a deceleration effect. After the medicine passes through each medicine buffer unit and is decelerated step by step, it finally enters the medicine in the simulated stomach at a very low speed and at a certain angle to the horizontal direction. The vertical impact is very small, so the stability of the weighing sensor reading can be guaranteed, thereby ensuring the calibration accuracy of the flow sensor in the electric gastric lavage machine.

[0036] In the foregoing description of this specification, unless otherwise expressly specified or limited, terms such as "fixed," "mounted," "connected," or "connected" should be understood broadly. For example, the term "connected" can refer to a fixed connection, a removable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediary; or the internal connection between two components or the interaction between two components. Therefore, unless otherwise expressly defined in this specification, those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0037] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "center", "longitudinal", "transverse", "clockwise" or "counterclockwise", etc., which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0038] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinal numbers are used for descriptive purposes only and should not be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, "plurality" means at least two, such as two, three or more, etc., unless otherwise clearly specified.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A flow calibration device for an electric gastric lavage machine, comprising a simulated stomach connected to a gastric tube of the electric gastric lavage machine, a liquid medicine bucket connected to a liquid extraction tube of the electric gastric lavage machine, and a waste liquid bucket connected to a liquid discharge tube of the electric gastric lavage machine, and further comprising a simulated stomach support, a weighing sensor disposed between the simulated stomach support and the simulated stomach, characterized in that: The flow calibration device also includes a three-way joint, which includes a first interface for detachably connecting to the liquid outlet of the gastric tube, and the three-way joint also includes a second interface arranged downwardly opposite the first interface. A third interface is provided on the side of the three-way joint, and the third interface is connected to a liquid extraction tube extending to the bottom of the simulated stomach. The height of the second interface is higher than the height of the liquid inlet of the liquid extraction tube. A liquid outlet switch valve is provided at the second interface, and a liquid extraction switch valve is provided at the third interface. When the three-way joint is in a positive pressure environment, the liquid outlet switch valve is opened and the liquid extraction switch valve is closed; when the three-way joint is in a negative pressure environment, the liquid outlet switch valve is closed and the liquid extraction switch valve is opened. A liquid buffer device is provided between the second interface and the bottom of the simulated stomach for slowing down the liquid outlet speed of the second interface.

2. The flow calibration device according to claim 1, characterized in that: The liquid outlet switch valve includes a liquid outlet valve plate that can move up and down, and the bottom of the second interface has a second interface sealing mating portion for sealing with the liquid outlet valve plate. A liquid outlet valve plate reset spring is arranged between the upper side of the liquid outlet valve plate and the second interface. When the three-way joint is in a negative pressure environment, the liquid outlet valve plate moves upward and seals with the second interface sealing mating portion. When the three-way joint is in a positive pressure environment, an annular second interface liquid outlet is formed between the liquid outlet valve plate and the bottom of the second interface.

3. The flow calibration device according to claim 1, characterized in that: The liquid pumping switch valve includes a liquid pumping valve plate that can move left and right, a valve seat with an annular structure is provided in the third interface, a third interface sealing matching part for sealing with the liquid pumping valve plate is provided on the valve seat, and a liquid pumping valve plate reset spring is provided between the right side of the liquid pumping valve plate and the valve seat. When the three-way joint is in a positive pressure environment, the liquid pumping valve plate moves to the right and seals with the third interface sealing matching part, forming an annular third interface liquid pumping port between the liquid pumping valve plate and the valve seat.

4. The flow calibration device according to claim 3, characterized in that: When the inside of the three-way joint is in a negative pressure environment, the liquid extraction valve plate is located in the inner cavity of the three-way joint between the first interface and the second interface.

5. The flow calibration device according to claim 1, characterized in that: The bottom height of the waste liquid barrel is higher than the top height of the medicine liquid barrel, and the bottom of the waste liquid barrel is connected with the top of the medicine liquid barrel through a connecting pipe.

6. The flow calibration device according to any one of claims 1 to 5, characterized in that: The drug solution buffer device is connected to the simulated stomach support through a device bracket.

7. The flow calibration device according to claim 6, characterized in that: The device bracket includes a left bracket and a right bracket. Both the left bracket and the right bracket include a vertically arranged bracket rod. The bracket rod includes an upper bracket rod and a lower bracket rod that can float up and down relative to the upper bracket rod. A bracket rod floating spring is arranged between the lower bracket rod and the upper bracket rod, and the lower bracket rod is connected to the medicine liquid buffer device.

8. The flow calibration device according to claim 7, characterized in that: The liquid medicine buffer device includes a device barrel, the upper end of the device barrel is a device barrel liquid inlet arranged corresponding to the second interface, the lower end of the device barrel is a device barrel liquid outlet, and at least one liquid medicine buffer unit is arranged in the device barrel between the device barrel liquid inlet and the device barrel liquid outlet.

9. The flow calibration device according to claim 8, characterized in that: The medicine buffer unit includes an upper unit and a lower unit. The upper unit includes a left-side first guide plate and a right-side first guide plate arranged at intervals on the left and right. The left-side first guide plate gradually extends downward from left to right, and the right-side first guide plate gradually extends downward from right to left; the lower unit includes a left-side second guide plate and a right-side second guide plate arranged at intervals on the left and right. The left-side second guide plate gradually extends downward from right to left, and the right-side second guide plate gradually extends downward from left to right. The bottom of the left-side first guide plate faces the left-side second guide plate, and the bottom of the right-side first guide plate faces the right-side second guide plate.

10. The flow calibration device according to claim 9, characterized in that: The second interface is located on the upper center side of the left first guide plate and the left second guide plate of the uppermost liquid medicine buffer unit.

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