A system and method for intravenous puncture training

Abstract

The application discloses a system and method for venipuncture training, and relates to the field of training models, comprising a model body, a puncture needle and a liquid storage cylinder, wherein a stroke groove is formed in the model body; the stroke groove is provided with a vein simulation tube and a driving assembly for driving the vein simulation tube to slide in the stroke groove; the sliding direction of the vein simulation tube in the stroke groove is at an angle with the radial direction of the model body; the liquid storage cylinder is provided with liquid for simulating blood, the liquid outlet of the liquid storage cylinder is connected with the liquid inlet end of the vein simulation tube through a liquid pumping pump, and the liquid outlet end of the vein simulation tube is connected with the liquid return port of the liquid storage cylinder; and the needle tail of the puncture needle is connected with the liquid return port of the liquid storage cylinder through a pipeline. The application can dynamically adjust the depth of the vein simulation tube relative to the outer surface of the model body, and can adapt to the blood vessel conditions of different patients or different physiological and pathological states.

Description

Technical Field

[0001] This invention relates to the field of training models, and in particular to a system and method for training intravenous puncture. Background Technology

[0002] Vein puncture is a mandatory skill for every medical worker, and training usually requires a venipuncture training model.

[0003] Current puncture training models typically have a vein simulation tube that simulates a vein, and the position of the vein simulation tube is usually fixed. For example, the Chinese patent with publication number CN117672064A, "High-simulation arteriovenous puncture training arm," discloses a technical solution that shows that the vein simulation tube in most puncture training models in this industry is fixed, that is, the distance between the vein simulation tube and the skin surface is constant. At the same time, it also discloses the industry's judgment criterion of whether the puncture was successful, which is to use whether there is blood return from the puncture needle.

[0004] However, in reality, due to the different body types of patients, the distance between the veins and the skin surface varies. Furthermore, if a patient has edema, the veins are located deeper than when there is no edema; conversely, in cases of dehydration, the veins are located shallower than when there is no edema. Consequently, the fixed vein simulation tubes in the venipuncture training model can only meet basic training needs and cannot meet more advanced training requirements. In other words, the current puncture training model cannot reproduce the complex vascular conditions in clinical practice, has limited training scenarios, poor adaptability, and is difficult to simulate vascular conditions in different patients (such as obese, dehydrated, or emaciated) or under different physiological and pathological conditions. Although Chinese Patent CN215450618U discloses a "Training Device for Arm Vein Puncture" addressing the technical issue of adjusting the position of a simulated vein tube, this training device changes the distance between the simulated vein tube mounted on the outer wall of the inflatable cavity and the skin surface by inflating the cavity with gas, thus simulating different vascular conditions. However, changing the volume of the inflatable cavity causes varying degrees of compression on the skin and subcutaneous soft tissue. This results in changes in the density of the material used to simulate the subcutaneous soft tissue, affecting the trainee's puncture feel and training effectiveness. Furthermore, the materials used to simulate skin and subcutaneous soft tissue are typically deformable. Changes in the volume of the inflatable cavity also cause corresponding deformations in these materials; an increase in the volume of the inflatable cavity leads to an increase in the outer diameter of the arm model, making it difficult to control the depth and position of the simulated vein tube. Chinese patent CN117672064A proposes a "highly realistic arteriovenous puncture training arm" for adjusting the depth of venous simulation tubes. This solution simply uses multiple venous simulation tubes distributed at different depths to achieve training for venous simulation tube puncture at different depths, which has poor adaptability. Summary of the Invention

[0005] The purpose of this invention is to provide a system and method for training venous puncture, which addresses the problems mentioned above, and can dynamically adjust the depth of the venous simulation tube relative to the outer surface of the mannequin, adapting to the vascular conditions of different patients or different physiological and pathological states.

[0006] The technical solution adopted in this invention is as follows: A system for training intravenous puncture includes a phantom, a puncture needle, and a reservoir. The phantom has a travel groove inside; the travel groove contains a simulated vein tube, and a drive assembly for driving the simulated vein tube to slide within the travel groove; the direction in which the simulated vein tube slides within the travel groove forms an angle with the radial direction of the phantom; the reservoir stores a liquid simulating blood, the outlet of the reservoir is connected to the inlet of the simulated vein tube via a pump, and the outlet of the simulated vein tube is connected to the return port of the reservoir; the needle tail of the puncture needle is connected to the return port of the reservoir via a pipe.

[0007] Furthermore, the drive assembly includes at least two linear motors, multiple linear motors are distributed along the vein simulation tube, and at least one linear motor is present at each end of the vein simulation tube; the fixed end of the linear motor is connected to the groove wall of the stroke groove, and the movable end of the linear motor is connected to the outer wall of the vein simulation tube.

[0008] Furthermore, it also includes a controller, with the linear motor connected to the output of the controller.

[0009] Furthermore, a venous pressure sensor is installed inside the venous simulation tube, the venous pressure sensor is connected to the controller, and the liquid pump is connected to the output terminal of the controller.

[0010] Furthermore, it also includes an inertial measurement unit for acquiring the spatial attitude of the puncture needle, the inertial measurement unit being connected to the controller.

[0011] Furthermore, the controller is connected to a PC.

[0012] Furthermore, the phantom includes a skin simulation layer, a skeleton simulation component, and a tissue simulation layer located between the skin simulation layer and the skeleton simulation component, with the travel groove formed in the tissue simulation layer.

[0013] Furthermore, an artery simulation tube is also provided inside the mold. The inlet end of the artery simulation tube is connected to the outlet of the storage cylinder through a pulsating pump, and the outlet end of the artery simulation tube is connected to the return port of the storage cylinder.

[0014] Furthermore, an arterial pressure sensor is installed inside the simulated artery tube.

[0015] A method for intravenous puncture training, using the aforementioned intravenous puncture training system, includes the following steps: S1: The controller controls the start of the pump, which draws simulated blood from the reservoir into the simulated vein tube. After passing through the simulated vein tube, the liquid flows back to the reservoir through the return port. S2: The venous pressure sensor in the venous simulation tube acquires the fluid pressure in the vein and feeds the fluid pressure back to the controller. The controller adjusts the working pressure of the pump according to the acquired fluid pressure until the fluid pressure is maintained within the error range of the target pressure. S3: The controller controls the drive assembly to slide the vein simulation tube in the stroke groove, adjusting the distance between the vein simulation tube and the outer surface of the model. S4: Trainer training; The trainer locates the intravenous catheter and performs the puncture procedure with the needle in hand; If there is no fluid backflow in the needle, the puncture position is inaccurate; If there is fluid backflow in the needle, the puncture position is accurate. S5: Modify the target pressure, repeat steps S2-S4, and complete the puncture training for trainers with different vein diameters and depths.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: This invention provides a travel groove inside the phantom body, and the direction in which the vein simulation tube moves within the travel groove is not along the radial direction of the phantom body. This ensures that the depth of the vein simulation tube relative to the outer surface of the phantom body changes when the vein simulation tube moves, while ensuring that there is always a tissue simulation layer above the vein simulation tube. This allows the invention to adapt to the vascular conditions of different patients or different physiological and pathological states. Attached Figure Description

[0017] The present invention will be described by way of example and with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional schematic diagram of the mold; Figure 3 This is a schematic diagram showing the connection between the vein simulation tube and the linear motor; The diagram is labeled as follows: 1-Phantom; 11-Skin simulation layer; 12-Tissue simulation layer; 13-Skeleton simulation component; 14-Stroke groove; 2-Vein simulation tube; 21-Vein pressure sensor; 22-Linear motor; 221-Damping pad; 222-Connecting ring; 23-Liquid pump; 3-Reservoir cylinder; 4-Artery simulation tube; 41-Artery pressure sensor; 42-Pulsating pump; 5-Solenoid valve; 6-Controller; 7-PC terminal. Detailed Implementation

[0018] In the description of this specification, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," or "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing this specification and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this specification.

[0019] Furthermore, the use of terms such as "horizontal" or "vertical" in this specification does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0020] In the description of this specification, it should also be noted that, unless otherwise expressly specified and limited, the terms “set up,” “install,” “connect,” and “link” should be interpreted broadly. For example, a link can be a fixed link, a detachable link, or an integral link; it can be a mechanical link or an electrical link; it can be a direct link or an indirect link through an intermediate medium; it can be a connection within two components.

[0021] Example 1 like Figures 1-3 As shown, a system for training intravenous puncture includes a phantom 1, a puncture needle, and a reservoir 3. The phantom 1 has a travel groove 14 inside; the travel groove 14 contains a simulated vein tube 2, and a drive assembly for driving the simulated vein tube 2 to slide within the travel groove 14; the direction in which the simulated vein tube 2 slides within the travel groove 14 forms an angle with the radial direction of the phantom 1; the reservoir 3 stores a liquid simulating blood, and the outlet of the reservoir 3 is connected to the inlet of the simulated vein tube 2 via a pump 23, while the outlet of the simulated vein tube 2 is connected to the return port of the reservoir 3; the needle tail of the puncture needle is connected to the return port of the reservoir 3 via a pipe.

[0022] In this embodiment, a travel groove 14 is provided to provide a movable space for the vein simulation tube 2; specifically, the travel groove 14 has three dimensions: depth, length, and width; wherein: The depth is the size that accommodates the vein simulation tube 2. Preferably, the depth does not exceed half of the outer diameter of the vein simulation tube 2, so that the trainee can feel the position of the vein simulation tube 2 by touching the phantom 1, so as to match the actual method of finding veins by touch; the length is the size that accommodates the axial length of the vein simulation tube 2, that is, the two ends of the vein simulation tube 2 passing through the travel groove 14 in the length direction; the width is the direction of movement of the vein simulation tube 2.

[0023] Furthermore, the design requirement of the travel groove 14 is that "the direction in which the vein simulation tube 2 slides within the travel groove 14 forms an angle with the radial direction of the mold body 1". In reality, the width direction of the travel groove 14 forms an angle with the radial direction of the mold body 1. The radial direction of the mold body 1 is actually considered as a cylinder with a circular cross-section. The radial direction refers to the radius or diameter direction from the center of the circle to the circumference. This design allows the vein simulation tube 2 to have a change in depth during movement, while also preventing the absence of a tissue simulation layer 12 covering the vein simulation tube 2 due to changes in its position.

[0024] In this embodiment, for the vein simulation tube 2, a thin-walled elastic silicone tube with a Shore A hardness of approximately 5-10 and a wall thickness of 0.5-1.0 mm can be selected to simulate the low-pressure and collapsible characteristics of a vein. At the same time, after being punctured by a puncture needle, the needle hole of this thin-walled elastic silicone tube can automatically close, effectively preventing liquid leakage and withstanding multiple repeated punctures. This characteristic is well known to those skilled in the art, and will not be described in detail in this specification.

[0025] In this embodiment, based on the principle of reducing material waste, the vein simulation tube 2 can be detachably connected to the drive assembly, such as by a buckle or clamp, so that the vein simulation tube 2 can be directly replaced; at the same time, the vein simulation tube 2 can be detachably connected to the reservoir 3 and the pump 23.

[0026] In this embodiment, the simulated blood in the storage tank 3 is transported to the vein simulation tube 2 by the pump 23, and then flows back to the storage tank 3 after passing through the vein simulation tube 2. The working pressure of the pump 23 is adjusted, thereby adjusting the liquid pressure in the vein simulation tube 2. Since the vein simulation tube 2 is a thin-walled elastic silicone tube, the inner diameter of the vein simulation tube 2 can be further adjusted.

[0027] Of course, a further feasible design is to install a solenoid valve 5 between the outlet end of the vein simulation tube 2 and the return port of the storage cylinder 3. By controlling the opening of the solenoid valve 5, the liquid pressure in the vein simulation tube 2 can be regulated in conjunction with the pump 23.

[0028] In summary, the system disclosed in this embodiment allows trainers to determine whether a puncture is accurate by observing whether there is fluid backflow in the puncture needle during puncture training. By adjusting the position of the venous simulation tube 2 and the working pressure of the aspiration pump 23, it is possible to adapt to vascular conditions under different simulated patients or different physiological and pathological states.

[0029] Example 2 Based on Example 1, further feasible implementation methods are proposed.

[0030] In one feasible implementation, the drive assembly includes at least two linear motors 22, and the plurality of linear motors 22 are distributed along the vein simulation tube 2, with at least one linear motor 22 at each end of the vein simulation tube 2; the fixed end of the linear motor 22 is connected to the groove wall of the stroke groove 14, and the movable end of the linear motor 22 is connected to the outer wall of the vein simulation tube 2.

[0031] Furthermore, there are two linear motors 22, located at both ends of the vein simulation tube 2. By operating one or more of the linear motors 22, the vein simulation tube 2 is moved, thereby changing its position within the travel groove 14 and thus altering its depth relative to the surface of the phantom 1. Furthermore, by controlling any one of the linear motors 22 located at both ends of the vein simulation tube 2 to be inactive while the others are operational, the angle of the vein simulation tube 2 relative to the travel groove 14 in the length direction can be adjusted, enabling the simulation of scenes with simultaneously different depth dimensions (different depths of the vein simulation tube 2 relative to the surface of the phantom 1).

[0032] Based on the above description, one possible connection method is that any one of the linear motors 22 at both ends of the vein simulation tube 2 is hinged to the vein simulation tube 2, while the remaining linear motors 22 are slidably connected to the vein simulation tube 2. Specifically, the output end of the linear motor 22 is hinged with a connecting ring 222, through which the vein simulation tube 2 passes. The connecting ring 222 on the linear motor 22 that is slidably connected to the vein simulation tube 2 is slidably connected to the vein simulation tube 2, while the connecting ring 222 on the linear motor 22 that is only hinged to the vein simulation tube 2 is fixedly connected to the vein simulation tube 2. The hinge can adapt to changes in angle, and the slidable connection can adapt to changes in the axial length of the vein simulation tube 2 within the stroke groove 14, effectively avoiding motion interference. Considering the resistance generated by the tissue simulation layer 12 in the phantom 1 to the movement of the vein simulation tube 2, an elastic damping pad 221 (such as a rubber pad) can be set between the connecting ring 222 and the vein simulation tube 2 to increase the friction between the vein simulation tube 2 and the connecting ring 222 (this friction is greater than the friction between the vein simulation tube 2 and the tissue simulation layer 12), ensuring that the movement of the vein simulation tube 2 can proceed smoothly; the damping pad 221 is preferably an elastic pad to reduce the influence of liquid pressure on the change of the inner diameter of the vein simulation tube 2.

[0033] Of course, a connecting ring 222 can also be fixed directly at the output end of the linear motor 22, and the connecting ring 222 can be fixedly connected to the vein simulation tube 2 to realize the fixed connection between the linear motor 22 and the static simulation ring; however, this connection method requires synchronous operation when moving the vein simulation tube 2 to avoid motion interference; based on this, this connection method can only realize the movement of the vein simulation tube 2 along the width direction of the stroke groove 14.

[0034] Furthermore, since the space of the stroke slot 14 is small, and under the condition that the vein simulation tube 2 needs to be moved in full size within the stroke slot 14 as much as possible, the linear motor 22 can be selected as a multi-stage stroke motor.

[0035] One feasible implementation also includes a controller 6, wherein the linear motor 22 is connected to the output terminal of the controller 6, and the controller 6 controls the operation of the linear motor 22; it is feasible that the controller 6 is a microprocessor or a PLC. If a microprocessor is selected, an ARM Cortex-M4 core microprocessor can be used to run the FreeRTOS real-time operating system.

[0036] In one feasible implementation, a venous pressure sensor 21 is installed inside the venous simulation tube. The venous pressure sensor 21 is connected to the controller 6, and the pump 23 is connected to the output terminal of the controller 6. The venous pressure sensor 21 acquires the liquid pressure inside the venous simulation tube 2 and transmits the liquid pressure data to the controller 6. The controller 6 controls the output pressure of the pump 23 and / or controls the opening degree of the solenoid valve 5 described in Embodiment 1 according to the liquid pressure, thereby realizing the regulation of the liquid pressure inside the venous simulation tube 2.

[0037] One feasible implementation also includes an inertial measurement unit (IMU) for acquiring the spatial attitude of the puncture needle. The IMU is connected to the controller 6 and mainly consists of an accelerometer and a gyroscope. It is mounted on the shank of the puncture needle and can acquire the spatial attitude of the puncture needle, such as the puncture angle. This technical solution is well-known in the industry; for example, Chinese Patent No. CN120959895B discloses "An MR Arterial-Venous Dual-Mode Vascular Puncture Navigation System and Method," which describes how to acquire the spatial attitude of the puncture needle using an IMU. Therefore, it will not be specifically described in this specification. It should be noted that acquiring the spatial attitude of the puncture needle can be used as an evaluation basis for the puncture actions of trainees, such as assessing the degree of hand tremor.

[0038] In one feasible implementation, the controller 6 is connected to a PC to visualize the data acquired by the controller 6. The operator can also operate the controller 6 through the PC and issue control commands to the controller 6. The controller 6 then controls the working status of the liquid pump 23 and / or the linear motor 22 according to the received commands. If feasible, the relevant visualization software platform can be developed using C++ or Python language, and the user interface can be built using Unity 3D or Qt framework.

[0039] In one feasible implementation, the phantom 1 includes a skin simulation layer 11, a skeleton simulation component 13, and a tissue simulation layer 12 located between the skin simulation layer 11 and the skeleton simulation component 13. The travel groove 14 is formed in the tissue simulation layer 12 to simulate limb structure and give the trainee the feeling closest to real puncture when operating the puncture needle.

[0040] Furthermore, the skin simulation layer 11 is made of platinum-catalyzed vulcanized silicone with a Shore A hardness between 10 and 15 degrees to simulate the softness and elasticity of real human skin; the tissue simulation layer 12 is made of foamed silicone or ultra-soft silicone (Shore A hardness 0-5 degrees) to simulate the softness and support of fat and connective tissue; the skeleton simulation part 13 is made of ABS engineering plastic and is 3D printed or injection molded, with an shape consistent with the outline of the human forearm skeleton.

[0041] In one feasible implementation, an arterial simulation tube 4 is also provided inside the phantom 1. The inlet end of the arterial simulation tube 4 is connected to the outlet of the reservoir 3 via a pulse pump 42, and the outlet end of the arterial simulation tube 4 is connected to the return end of the reservoir 3. The arterial simulation tube 4 can be fixed inside the phantom 1, which conforms to the actual phenomenon that arteries are located on the surface of the skin. The pulse pump 42 can be a cam pump, which periodically superimposes a pulse wave on the baseline pressure according to the set heart rate (e.g., 60-100 beats / minute) and pulse pressure difference (e.g., 30-50 mmHg), thereby generating periodic changes in systolic and diastolic blood pressure. The pulse pump 42 is connected to a controller 6, and the controller 6 controls the rotation speed of the pulse pump 42 to adjust the pulse frequency.

[0042] Of course, a solenoid valve 5 can also be installed at the outlet of the arterial simulation tube 4 to control the opening of the solenoid valve 5, and work with the pulse pump 42 to achieve pressure control of the liquid pressure in the arterial simulation tube 4.

[0043] Furthermore, an arterial pressure sensor 41 is installed inside the arterial simulation tube 4 to monitor the dynamic pressure waveform inside the arterial simulation tube 4 in real time and transmit the dynamic pressure waveform to the controller 6. The controller 6 controls the rotation speed of the pulsating pump 42 according to the acquired dynamic pressure waveform to realize closed-loop feedback control and ensure that the amplitude and frequency of the pulsation are accurate and stable.

[0044] It should be noted that the above sensors (venous pressure sensor 21, arterial pressure sensor 41) are set inside the corresponding simulation tubes (venous simulation tube 2, arterial simulation tube 4), while the controller 6 is located outside the simulation tubes. The signal lines of the sensors can pass through the corresponding simulation tubes and connect to the controller 6. The positions where the signal lines pass through the simulation tubes can be sealed and fixed with sealant.

[0045] Example 3 A method for intravenous puncture training, using a system for intravenous puncture training as described in any one of Embodiments 1-2, includes the following steps: S1: Controller 6 controls the start of pump 23. Pump 23 draws simulated blood from the reservoir 3 and enters the simulated vein tube 2. After passing through the simulated vein tube 2, the liquid flows back to the reservoir 3 from the return port. S2: The venous pressure sensor 21 in the venous simulation tube 2 acquires the fluid pressure in the vein and feeds the fluid pressure back to the controller 6. The controller 6 adjusts the working pressure of the pump 23 according to the acquired fluid pressure until the fluid pressure is maintained within the error range of the target pressure (e.g., 5-20 mmHg). S3: Controller 6 controls the drive assembly to slide the vein simulation tube 2 in the stroke groove 14, adjusting the distance between the vein simulation tube 2 and the outer surface of the model 1. S4: Trainer training; The trainer locates the position of the intravenous simulation tube 2 and performs the puncture operation by holding the puncture needle; If there is no fluid backflow in the puncture needle, the puncture position of the puncture needle is inaccurate; If there is fluid backflow in the puncture needle, the puncture position of the puncture needle is accurate. S5: Modify the target pressure, repeat steps S2-S4, and complete the puncture training for trainers with different vein diameters and depths.

[0046] It should be noted that the liquid pressure inside the vein simulation tube 2 can be adjusted. Since the vein simulation tube 2 is a thin-walled elastic silicone tube, the inner diameter of the vein simulation tube 2 can be further adjusted. For example, the inner diameter can be dynamically changed between 2mm and 8mm through the hydraulic system to simulate the low pressure and collapse characteristics of veins.

[0047] It should be noted that the above is for intravenous puncture training. For arterial puncture training, the trainer locates the position of the simulated arterial tube 4 and performs the puncture operation by holding the puncture needle. If there is no fluid backflow in the puncture needle, the puncture position is inaccurate. If there is fluid backflow in the puncture needle, the puncture position is accurate.

[0048] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A system for training intravenous puncture, characterized in that: The device includes a phantom body (1), a puncture needle, and a reservoir (3). The phantom body (1) has a travel groove (14) inside. The travel groove (14) contains a vein simulation tube (2) and a drive assembly for driving the vein simulation tube (2) to slide within the travel groove (14). The direction in which the vein simulation tube (2) slides within the travel groove (14) forms an angle with the radial direction of the phantom body (1). The reservoir (3) stores liquid that simulates blood. The outlet of the reservoir (3) is connected to the inlet of the vein simulation tube (2) via a pump (23), and the outlet of the vein simulation tube (2) is connected to the return port of the reservoir (3). The needle tail of the puncture needle is connected to the return port of the reservoir (3) via a pipe.

2. The system according to claim 1, characterized in that: The drive assembly includes at least two linear motors (22), and multiple linear motors (22) are distributed along the vein simulation tube (2), with at least one linear motor (22) at each end of the vein simulation tube (2); the fixed end of the linear motor (22) is connected to the wall of the travel groove (14), and the movable end of the linear motor (22) is connected to the outer wall of the vein simulation tube (2).

3. The system according to claim 2, characterized in that: It also includes a controller (6), and the linear motor (22) is connected to the output of the controller (6).

4. The system according to claim 3, characterized in that: The vein simulation tube is equipped with a vein pressure sensor (21), which is connected to the controller (6). The pump (23) is connected to the output end of the controller (6).

5. The system according to claim 3, characterized in that: It also has an inertial measurement unit for acquiring the spatial attitude of the puncture needle, the inertial measurement unit being connected to the controller (6).

6. The system according to any one of claims 3-5, characterized in that: The controller (6) is connected to the PC (7).

7. The system according to claim 1, characterized in that: The phantom (1) includes a skin simulation layer (11), a skeleton simulation component (13), and a tissue simulation layer (12) located between the skin simulation layer (11) and the skeleton simulation component (13), and the travel groove (14) is formed in the tissue simulation layer (12).

8. The system according to claim 1, characterized in that: The mold (1) is also equipped with an artery simulation tube (4). The inlet end of the artery simulation tube (4) is connected to the outlet of the storage cylinder (3) through a pulse pump (42), and the outlet end of the artery simulation tube (4) is connected to the return port of the storage cylinder (3).

9. The system according to claim 8, characterized in that: An arterial pressure sensor (41) is installed inside the arterial simulation tube (4).

10. A method for intravenous puncture training, using the intravenous puncture training system according to any one of claims 1-9, characterized in that: Includes the following steps: S1: The controller (6) controls the start of the pump (23). The pump (23) draws the simulated blood liquid from the reservoir (3) into the vein simulation tube (2). After passing through the vein simulation tube (2), the liquid flows back to the reservoir (3) from the return port of the reservoir (3). S2: The venous pressure sensor (21) in the venous simulation tube (2) acquires the liquid pressure in the vein and feeds the liquid pressure back to the controller (6). The controller (6) adjusts the working pressure of the pump (23) according to the acquired liquid pressure until the liquid pressure is maintained within the error range of the target pressure. S3: The controller (6) controls the drive assembly to slide the vein simulation tube (2) in the stroke groove (14) and adjust the distance between the vein simulation tube (2) and the outer surface of the model (1); S4: Trainer training; The trainer locates the position of the intravenous simulation tube (2) and performs the puncture operation by holding the puncture needle; If there is no fluid backflow in the puncture needle, the puncture position is inaccurate; if there is fluid backflow in the puncture needle, the puncture position is accurate. S5: Modify the target pressure, repeat steps S2-S4, and complete the puncture training for trainers with different vein diameters and depths.

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