Analog arteriovenous fistula puncture simulation training device for hemodialysis patients

Abstract

The present application belongs to the medical technical field, and specifically relates to a simulation hemodialysis patient arteriovenous fistula puncture simulation training device. The simulation hemodialysis patient arteriovenous fistula puncture simulation training device is convenient to operate and has a real simulation effect. The device comprises two brackets, the upper parts of the two brackets are respectively provided with clamping seats for clamping and fixing arm models, the middle parts of the two brackets are respectively provided with rotating shafts, one rotating shaft is connected with an adjusting handle at the outer end, a liquid storage tank is connected between the two rotating shafts, a sleeve is sleeved on the outer wall of the liquid storage tank, and a liquid supply module is arranged between the liquid storage tank and the sleeve. The device is provided with a plurality of groups of detachable and replaceable blood vessel models. The liquid supply module can realize pressure maintaining of the blood vessel model after the blood vessel model is connected and positioned and simulated blood is injected, the arm model is fixed, the second pressure sensing sheet is tightly attached to the outer wall of the blood vessel model by pressing the guide seat, and the puncture training can be carried out. The first pressure sensing sheet and the second pressure sensing sheet detect the puncture condition and feed back to the display panel during puncture.

Description

Technical Field

[0001] This invention belongs to the field of medical technology, specifically a simulation training device for arteriovenous fistula puncture in hemodialysis patients. Background Technology

[0002] In the medical field, intravenous puncture is a fundamental procedure widely used in clinical nursing and emergency care, and proficiency in this procedure directly affects patient experience and treatment efficiency. However, traditional puncture training relies heavily on physical models or clinical practice. Physical models have fixed vascular conditions, making it difficult to simulate the dynamic characteristics of real human blood vessels, such as tension and fluid circulation, and they also have poor reusability, resulting in high training costs. Clinical practice, on the other hand, carries risks and can easily cause secondary harm to patients. Furthermore, novice medical staff often find it difficult to master puncture techniques through clinical practice in a short period of time.

[0003] For example, a simulation training device for puncturing arteriovenous fistulas in hemodialysis patients, with authorization announcement number CN113129720B and application date of April 21, 2021, is published on the Chinese Patent website. The device includes a workbench and omnidirectional brake wheels. The workbench has omnidirectional brake wheels at its bottom, a support shaft with a bearing in the middle of its upper surface, a directional sleeve on the outer wall of the support arm, an extension screw rotatably connected to the side of the first fixing plate, a positioning rod fixedly installed on the top outer wall of the support column, a directional support rod fixedly connected to the outer wall of the support shaft, and a lifting rod fixedly connected to the upper surface of the lifting screw. This simulation training device only provides auxiliary functions related to clamping, adjusting the position, and storing tools for the fistula model, but it lacks any simulation feedback design for puncture effects. It cannot simulate key feedback of successful or failed punctures in real clinical settings, such as blood return, vascular rupture, or improper puncture depth. This makes it difficult for users to judge the effectiveness of the operation, resulting in a disconnect between the training effect and real clinical scenarios, and failing to accurately improve puncture skill proficiency.

[0004] Therefore, there is an urgent need for a convenient and realistic simulation training device for arteriovenous fistula puncture in hemodialysis patients to address many of the pain points in existing technologies. Summary of the Invention

[0005] In order to overcome the shortcomings of existing simulation training equipment in actual use, the present invention provides a simulation training device for puncturing arteriovenous fistulas in hemodialysis patients that is easy to operate and has a realistic simulation effect.

[0006] A simulation training device for arteriovenous fistula puncture in hemodialysis patients includes a base with two supports symmetrically arranged on the upper part of the base. Each of the two supports has a clamp for holding and fixing an arm model. The device also includes rotating shafts that are respectively inserted through the middle of the two supports. One of the rotating shafts has an adjustment handle connected to its outer end. A liquid storage tank is connected between the two rotating shafts. A sleeve is fitted on the outer wall of the liquid storage tank. A liquid supply module is arranged between the liquid storage tank and the sleeve. The liquid supply module includes an infusion component for supplying liquid to the blood vessel model and a return component for recycling the liquid. Feedback modules for simulating puncture training of the blood vessel model are respectively arranged on the sleeve and the arm model. The feedback modules include a bottom sensing component for puncture feedback of the blood vessel model and a top sensing component for successful puncture of the blood vessel model.

[0007] Furthermore, the infusion assembly includes a first pump, a suction tube, a counterweight ball, a first electric valve, and an inlet ring channel. The first pump and the inlet ring channel are provided on one side of the storage tank. The inlet of the first pump is rotatably connected to the suction tube, and one end of the suction tube extends into the storage tank. The end of the suction tube is fitted with a counterweight ball. The outlet of the first pump is connected to the inlet ring channel by a first electric valve.

[0008] Furthermore, the return liquid assembly includes a second liquid pump, a second electric valve, an outlet loop, a connecting pipe head, and a filling nozzle. The other side of the storage tank is provided with a second liquid pump and an outlet loop, and the outlet of the second liquid pump is connected to the storage tank. The inlet of the second liquid pump is connected to the outlet loop with a second electric valve. The inlet loop and the outlet loop are connected circumferentially with connecting pipe heads at intervals. A blood vessel model is detachably sleeved between a set of axially corresponding connecting pipe heads. The outer wall of the storage tank is connected to a filling nozzle, and the filling nozzle is sleeved on the outer wall of the sleeve for adding liquid to the storage tank.

[0009] Furthermore, the bottom sensing component includes a positioning plate groove, a first pressure sensing piece, and a display panel. Positioning plate grooves are distributed circumferentially on the outer wall of the sleeve. A first pressure sensing piece that contacts the blood vessel model is embedded in the center of the positioning plate groove. A display panel is embedded on one side of the arm model. The first pressure sensing piece is electrically connected to the display panel. A slot for limiting the blood vessel model is opened in the positioning plate groove.

[0010] Furthermore, the top sensing component includes a connecting seat, a sliding frame, a limiting seat, a return spring, a guide seat, and a second pressure sensing plate. The arm model has a through hole in the middle for simulating training operations. Connecting seats are symmetrically arranged on one side of the inner wall of the through hole. Sliding frames are vertically slidably arranged on the two connecting seats. A guide seat is connected between the upper parts of the two sliding frames. A return spring is connected between the bottom of the connecting seat and the sliding frame. A limiting seat is connected between the lower parts of the two sliding frames. A second pressure sensing plate that can contact the blood vessel model is embedded in the middle of the limiting seat, and the second pressure sensing plate is also electrically connected to the display panel.

[0011] Furthermore, it also includes hooks, adjusting arms, telescopic rods, elastic elements, and locking blocks. The guide seat is symmetrically provided with guide grooves, and horizontally sliding hooks are symmetrically distributed in the guide grooves. The upper part of the hook is connected to the adjusting arm, and a telescopic rod is connected between corresponding hooks. The telescopic rod is covered with an elastic element, and the two ends of the elastic element are respectively connected to the corresponding hooks. A locking block is provided on the inner wall of the through hole. When the lower end of the hook is hooked on the locking block, the limiting seat can contact the positioning plate groove, so that the second pressure sensing plate can be tightly attached to the outer wall of the blood vessel model filled with liquid.

[0012] Furthermore, it also includes a positioning ring, a compression spring, a retaining bead, and a rotating ring. A positioning ring is provided on the side of the bracket near the adjustment handle. A retaining bead is embedded and movable inside the positioning ring. A compression spring abuts between the retaining bead and the positioning ring. A rotating ring is sleeved on one end of the shaft near the adjustment handle, and the rotating ring is located inside the positioning ring. Positioning grooves that match the retaining bead are provided circumferentially on the outer side of the rotating ring.

[0013] Furthermore, it also includes a guide rail, a liquid collection box, and a filter plate. A U-shaped guide rail is provided in the middle of the upper side of the base, and a liquid collection box is pulled out and fitted inside it. A filter plate is detachably fitted on the top of the liquid collection box.

[0014] Compared with the prior art, the present invention has the following advantages: by setting up multiple sets of detachable and replaceable vascular models, the liquid supply module can maintain pressure on the vascular model after it has been fitted, positioned and injected with simulated blood. Then, the arm model is fixed and the second pressure sensing plate is pressed against the outer wall of the vascular model by pressing the guide seat, so that puncture training can be carried out. During puncture, the puncture status is detected by the first and second pressure sensing plates and fed back to the display panel. After training, it can be easily rotated to switch to the next set of simulated puncture training. It can also achieve cyclic training for recovering simulated blood and easily replacing vascular models. The overall operation is simple and the simulation effect is realistic and efficient. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Figure 2 This is a top view of the present invention.

[0017] Figure 3 This is a three-dimensional structural diagram of the liquid supply module of the present invention.

[0018] Figure 4 This is a cross-sectional view of the liquid supply module of the present invention.

[0019] Figure 5 This is a three-dimensional structural diagram of the arm model and feedback module of the present invention.

[0020] Figure 6 This is a three-dimensional structural diagram of the feedback module of the present invention.

[0021] Figure 7 This is a partial structural diagram of the feedback module of the present invention.

[0022] Figure 8 This is a three-dimensional structural diagram of the guide rail, liquid collection box, and filter plate of the present invention.

[0023] Figure 9 This is a three-dimensional structural diagram of the positioning ring, compression spring, retaining ball, and rotating ring of the present invention.

[0024] The components in the attached diagram are labeled as follows: 1. Base, 2. Bracket, 20. Clamp, 3. Shaft, 30. Adjusting handle, 4. Sleeve, 5. Storage tank, 50. First pump, 51. Suction tube, 52. Counterweight ball, 53. First electric valve, 54. Inlet loop, 55. Second pump, 56. Second electric valve, 57. Outlet loop, 58. Connecting pipe head, 59. Filling nozzle, 6. Positioning plate groove, 60. First pressure sensor, 7. Connecting... 70. Sliding frame, 71. Limiting bracket, 72. Reset spring, 73. Guide seat, 74. Guide groove, 75. Second pressure sensing plate, 76. Display panel, 8. Hook, 80. Adjusting arm, 81. Telescopic rod, 82. Elastic element, 83. Locking block, 9. Positioning ring, 90. Compression spring, 91. Locking ball, 92. Rotary ring, 93. Positioning groove, 10. Guide rail, 11. Liquid collection box, 12. Filter plate, 100. Arm model, 200. Blood vessel model. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Example 1: The present invention provides a simulation training device for arteriovenous fistula puncture in hemodialysis patients, see below. Figures 1 to 9As shown, the device includes a base 1, with two symmetrical supports 2 on the upper part of the base 1. Each support 2 has a clamp 20 for holding and fixing the arm model 100. A rotating shaft 3 is rotatably threaded through the middle of each support 2. One shaft 3 has an adjusting handle 30 connected to its outer end for rotating and switching between different puncture modules. A liquid storage tank 5 is connected between the two shafts 3. A sleeve 4 is fitted onto the outer wall of the liquid storage tank 5. A liquid supply module is located between the liquid storage tank 5 and the sleeve 4. The liquid supply module includes an infusion assembly for supplying fluid to the blood vessel model 200, and... The liquid return component for liquid recycling, the cannula 4 and the arm model 100 are respectively equipped with feedback modules for simulating puncture training of the blood vessel model 200. The feedback module includes a bottom sensing component for puncture feedback of the blood vessel model 200 and a top sensing component for successful puncture of the blood vessel model 200. During puncture training of the blood vessel model 200, the liquid supply module can inject simulated liquid into the blood vessel model 200, which helps to simulate the state of real human blood vessels, and the feedback module can achieve a more realistic puncture state.

[0027] Furthermore, the infusion assembly includes a first suction pump 50, a suction tube 51, a counterweight ball 52, a first electric valve 53, and an inlet ring channel 54. The first suction pump 50 and the inlet ring channel 54 are provided on one side of the storage tank 5. The suction tube 51 is rotatably connected to the inlet of the first suction pump 50, and one end of the suction tube 51 extends into the storage tank 5. The end of the suction tube 51 is fitted with a counterweight ball 52 to keep the end of the suction tube 51 always close to the bottom of the storage tank 5. The first electric valve 53 is connected between the outlet of the first suction pump 50 and the inlet ring channel 54. By closing the first electric valve 53, the backflow of liquid inside the vascular model 200 can be effectively prevented.

[0028] Furthermore, the feedback module return component includes a second pump 55, a second electric valve 56, an outlet loop 57, a connecting pipe head 58, and a filling nozzle 59. The other side of the storage tank 5 is provided with the second pump 55 and the outlet loop 57, and the outlet of the second pump 55 is connected to the storage tank 5. The inlet of the second pump 55 is connected to the outlet loop 57 by the second electric valve 56. The inlet loop 54 and the outlet loop 57 are circumferentially connected by connecting pipe heads 58. A set of axially corresponding connecting pipe heads 58 are detachably sleeved with a blood vessel model 200. The outer wall of the storage tank 5 is connected to the filling nozzle 59, and the filling nozzle 59 is sleeved on the outer wall of the sleeve 4 for adding and replenishing liquid to the storage tank 5.

[0029] Furthermore, the bottom sensing component includes a positioning plate groove 6, a first pressure sensing piece 60, and a display panel 76. The outer wall of the sleeve 4 is circumferentially spaced with positioning plate grooves 6. The first pressure sensing piece 60, which is in contact with the blood vessel model 200, is embedded in the middle of the positioning plate groove 6. The display panel 76 is embedded on one side of the arm model 100, and the first pressure sensing piece 60 is electrically connected to the display panel 76. The positioning plate groove 6 has a slot for limiting the blood vessel model 200, which can effectively prevent the blood vessel model 200 from shifting during the simulated puncture process, thereby improving the success rate of puncture.

[0030] Furthermore, the top sensing component includes a connecting seat 7, a sliding frame 70, a limiting seat 71, a return spring 72, a guide seat 73, and a second pressure sensing plate 75. The arm model 100 has a through hole in the middle for simulating training operations. Connecting seats 7 are symmetrically arranged on one side of the inner wall of the through hole. Sliding frames 70 are vertically slidably arranged on the two connecting seats 7. A guide seat 73 is connected between the upper parts of the two sliding frames 70. A return spring 72 is connected between the bottom of the connecting seat 7 and the sliding frame 70. A limiting seat 71 is connected between the lower parts of the two sliding frames 70. A second pressure sensing plate 75 that can contact the blood vessel model 200 is embedded in the middle of the limiting seat 71. The second pressure sensing plate 75 is also electrically connected to the display panel 76 and can automatically record the signal values ​​fed back by the first pressure sensing plate 60 and the second pressure sensing plate 75, which is conducive to efficiently simulating real arteriovenous fistula puncture training.

[0031] Furthermore, it also includes hooks 8, adjusting arms 80, telescopic rods 81, elastic elements 82, and locking blocks 83. Guide grooves 74 are symmetrically arranged on the guide seat 73, and hooks 8 that can slide horizontally are symmetrically distributed in the guide grooves 74. Adjusting arms 80 are connected to the upper part of hooks 8, and telescopic rods 81 are connected between corresponding hooks 8. Elastic elements 82 are sleeved on the telescopic rods 81, and the two ends of the elastic elements 82 are respectively connected to the corresponding hooks 8. The elastic elements 82 are compression springs, which are used to provide tension to the hooks 8 on both sides so that the hooks 8 can be firmly locked with the corresponding locking blocks 83. Locking blocks 83 are provided on the inner wall of the through hole. When the lower end of the hook 8 is hooked on the locking block 83, the limiting seat 71 can contact the positioning plate groove 6 so that the second pressure sensing plate 75 can be tightly attached to the outer wall of the blood vessel model 200 filled with liquid for real-time monitoring of the puncture status of the blood vessel model 200.

[0032] Before use, the vascular model 200 is fitted onto the corresponding connecting tube heads 58. The slots in the positioning plate groove 6 guide and limit the vascular model 200, ensuring it is positioned above the first pressure sensing plate 60. Then, simulated blood liquid is injected into the storage tank 5 through the filling nozzle 59. Next, the first electric valve 53 is opened, and the first liquid pump 50 is started to transport the liquid in the storage tank 5 to the inlet loop 54, so that the liquid can fill the vascular model 20 connected between the inlet loop 54 and the outlet loop 57. 0, to simulate the state of a real blood vessel; shut off the first suction pump 50 and the first electric valve 53 to complete the liquid filling and maintain pressure on the blood vessel model 200; simply snap the arm model 100 with the through hole between the two clamps 20 to achieve the purpose of quick installation and fixation of the arm model 100; by pressing down on the guide seat 73, the sliding frame 70 drives the limiting seat 71 and the hook 8 to move down along the connecting seat 7, the return spring 72 is compressed, when the lower end of the hook 8 is hooked on the block 83, and through the tensioning of the telescopic rod 81 and the elastic element 82, the arm model 100 can be quickly installed and fixed; by pressing down on the guide seat 73, the sliding frame 70 drives the limiting seat 71 and the hook 8 to move down along the connecting seat 7, the return spring 72 is compressed, and when the lower end of the hook 8 is hooked on the block 83, and through the tensioning of the telescopic rod 81 and the elastic element 82, the arm model 100 can be quickly installed and fixed. The second pressure sensor 75 is positioned so that it adheres tightly to the outer wall of the blood vessel model 200, allowing for puncture training of the blood vessel model 200. When the simulated puncture is successful, some of the fluid inside the blood vessel model 200 will flow into the training needle under negative pressure, reducing the amount of fluid inside the blood vessel model 200 and thus lowering its tension. When the second pressure sensor 75 detects this signal value, it will immediately provide feedback to the display panel 76. When the blood vessel model 200 is completely punctured, the first pressure sensor will be activated. The pressure sensor 60 may cause partial leakage of liquid inside the vascular model 200, leading to a decrease in its internal tension. The first pressure sensor 60 can sense the signal in real time and feed it back to the display panel 76 for recording. When no puncture is caused in the vascular model 200, the first pressure sensor 60 and the second pressure sensor 75 do not detect the corresponding signal and do not send a signal feedback. In this way, the puncture training of the vascular model 200 can be simulated more realistically, so as to achieve the purpose of more realistic and efficient simulation training. After the vascular model 200 training is completed, the second liquid pump 55 is started and the second electric valve 56 is opened to allow the liquid remaining in the vascular model 200 to flow back to the storage tank 5 through the liquid outlet loop 57. This can effectively reduce the waste of liquid. After the liquid in the vascular model 200 is recovered, the used vascular model 200 can be disassembled and replaced with a new vascular model 200 to achieve the purpose of cyclical simulation training.

[0033] Example 2: Based on Example 1, see... Figure 1 and Figure 9As shown, it also includes a positioning ring 9, a compression spring 90, a retaining bead 91, and a rotating ring 92. The positioning ring 9 is provided on the side of the bracket 2 near the adjusting handle 30. The retaining bead 91 is embedded and movably arranged inside the positioning ring 9. The compression spring 90 abuts between the retaining bead 91 and the positioning ring 9. The rotating ring 92 is sleeved on one end of the rotating shaft 3 near the adjusting handle 30, and the rotating ring 92 is located inside the positioning ring 9. The outer side of the rotating ring 92 is provided with positioning grooves 93 that are adapted to the retaining bead 91, which can realize multi-level locking and limiting of the rotating shaft 3. By rotating the adjusting handle 30, the blood vessel model 200 can be easily switched. The operation is simple and convenient.

[0034] When training the next set of vascular models 200 is required, simply squeeze the adjusting arms 80 on both sides to bring them closer together so that the lower ends of the hooks 8 on both sides can disengage from the blocks 83. Under the elastic force of the return spring 72, the sliding frame 70, the limiting seat 71, and the hooks 8 move upward and reset along the connecting seat 7, so that the second pressure sensing plate 75 disengages from the vascular model 200. Then, by rotating the adjusting handle 30 by an angle, the liquid storage tank 5, the sleeve 4, and the liquid supply module can be rotated synchronously by an angle via the rotating shaft 3. With the adaptive engagement of the compression spring 90 and the locking ball 91 with the positioning groove 93, the rotating shaft 3 can be quickly locked. In this way, the next set of simulation training can be carried out conveniently. The overall operation is simple and easy to use.

[0035] In addition, it also includes a guide rail 10, a collection box 11, and a filter plate 12. A U-shaped guide rail 10 is provided in the middle of the upper side of the base 1, and a collection box 11 is pulled out and fitted inside it. The top of the collection box 11 is detachably fitted with a filter plate 12. The collection box 11 at the bottom can collect the fluid that seeps out after the vascular model 200 is punctured during the simulated puncture training, as well as the fluid that remains inside the vascular model 200 during the removal and replacement process, so as to keep the surrounding environment dry and clean and effectively avoid waste of fluid. The arc-shaped filter plate 12 can collect the debris that may be generated during the puncture process, so as to facilitate cleaning.

[0036] It should be understood that the above description is for illustrative purposes only and is not intended to limit the invention. Those skilled in the art will understand that variations of the invention are included within the scope of the claims herein.

Claims

1. A simulation training device for arteriovenous fistula puncture in a hemodialysis patient, comprising a base (1), two supports (2) symmetrically arranged on the upper part of the base (1), and clamps (20) for clamping and fixing an arm model (100) respectively on the upper part of the two supports (2), characterized in that: It also includes rotating shafts (3) that are respectively inserted through the middle of the two supports (2), one of the rotating shafts (3) is connected to an adjustment handle (30) at its outer end, a liquid storage tank (5) is connected between the two rotating shafts (3), a sleeve (4) is fitted on the outer wall of the liquid storage tank (5), a liquid supply module is provided between the liquid storage tank (5) and the sleeve (4), the liquid supply module includes an infusion component for supplying liquid to the blood vessel model (200) and a return component for recycling the liquid, and feedback modules for simulating puncture training of the blood vessel model (200) are respectively provided on the sleeve (4) and the arm model (100), the feedback modules include a bottom sensing component for puncture feedback of the blood vessel model (200) and a top sensing component for successful puncture of the blood vessel model (200).

2. The simulation training device for arteriovenous fistula puncture in a hemodialysis patient according to claim 1, characterized in that: The infusion assembly includes a first pump (50), a suction tube (51), a counterweight ball (52), a first electric valve (53), and an inlet ring channel (54). The first pump (50) and the inlet ring channel (54) are provided on one side of the storage tank (5). The inlet of the first pump (50) is rotatably connected to the suction tube (51), and one end of the suction tube (51) extends into the storage tank (5). The end of the suction tube (51) is fitted with a counterweight ball (52). The outlet of the first pump (50) is connected to the inlet ring channel (54) by the first electric valve (53).

3. The simulation training device for arteriovenous fistula puncture in a hemodialysis patient according to claim 2, characterized in that: The return liquid assembly includes a second liquid pump (55), a second electric valve (56), an outlet ring channel (57), a connecting pipe head (58), and a filling nozzle (59). The other side of the storage tank (5) is provided with a second liquid pump (55) and an outlet ring channel (57), and the outlet of the second liquid pump (55) is connected to the storage tank (5). The inlet of the second liquid pump (55) is connected to the outlet ring channel (57) by a second electric valve (56). The inlet ring channel (54) and the outlet ring channel (57) are connected to the connecting pipe head (58) at intervals along the circumference. A set of axially corresponding connecting pipe heads (58) are detachably sleeved with a blood vessel model (200). The outer wall of the storage tank (5) is connected to a filling nozzle (59), and the filling nozzle (59) is sleeved on the outer wall of the sleeve (4) for filling the storage tank (5) with liquid.

4. The simulation training device for arteriovenous fistula puncture in a hemodialysis patient according to claim 1, characterized in that: The bottom sensing component includes a positioning plate groove (6), a first pressure sensing piece (60), and a display panel (76). The outer wall of the sleeve (4) is provided with positioning plate grooves (6) spaced around the periphery. The first pressure sensing piece (60) that contacts the blood vessel model (200) is embedded in the middle of the positioning plate groove (6). The display panel (76) is embedded on one side of the arm model (100). The first pressure sensing piece (60) is electrically connected to the display panel (76). The positioning plate groove (6) is provided with a slot for limiting the blood vessel model (200).

5. The simulation training device for arteriovenous fistula puncture in a hemodialysis patient according to claim 4, characterized in that: The top sensing component includes a connecting seat (7), a sliding frame (70), a limiting seat (71), a reset spring (72), a guide seat (73), and a second pressure sensing plate (75). The arm model (100) has a through hole in the middle for simulating training operations. The connecting seat (7) is symmetrically arranged on one side of the inner wall of the through hole. The sliding frame (70) is vertically slidably arranged on the two connecting seats (7). The guide seat (73) is connected between the upper parts of the two sliding frames (70). The reset spring (72) is connected between the bottom of the connecting seat (7) and the sliding frame (70). The limiting seat (71) is connected between the lower parts of the two sliding frames (70). The second pressure sensing plate (75) that can contact the blood vessel model (200) is embedded in the middle of the limiting seat (71), and the second pressure sensing plate (75) is also electrically connected to the display panel (76).

6. The simulation training device for puncturing arteriovenous fistulas in hemodialysis patients according to claim 5, characterized in that: It also includes hooks (8), adjusting arms (80), telescopic rods (81), elastic elements (82) and locking blocks (83). Guide grooves (74) are symmetrically arranged on the guide seat (73). Hooks (8) that can slide horizontally are symmetrically distributed in the guide grooves (74). Adjusting arms (80) are connected to the upper part of hooks (8). Telescopic rods (81) are connected between corresponding hooks (8). Elastic elements (82) are provided on the outer sleeve of the telescopic rods (81). The two ends of the elastic elements (82) are respectively connected to the corresponding hooks (8). Locking blocks (83) are provided on the inner wall of the through hole. When the lower end of the hook (8) is hooked on the locking block (83), the limiting seat (71) can contact the positioning plate groove (6) so that the second pressure sensing plate (75) can be tightly attached to the outer wall of the blood vessel model (200) filled with liquid.

7. The simulation training device for arteriovenous fistula puncture in a hemodialysis patient according to claim 1, characterized in that: It also includes a positioning ring (9), a compression spring (90), a retaining bead (91) and a rotating ring (92). A positioning ring (9) is provided on the side of the bracket (2) near the adjustment handle (30). A retaining bead (91) is embedded and movable inside the positioning ring (9). A compression spring (90) abuts between the retaining bead (91) and the positioning ring (9). A rotating ring (92) is sleeved on one end of the rotating shaft (3) near the adjustment handle (30), and the rotating ring (92) is located inside the positioning ring (9). A positioning groove (93) that matches the retaining bead (91) is provided circumferentially on the outer side of the rotating ring (92).

8. The simulation training device for puncturing arteriovenous fistulas in hemodialysis patients according to claim 1, characterized in that: It also includes a guide rail (10), a liquid collection box (11) and a filter plate (12). A U-shaped guide rail (10) is provided in the middle of the upper side of the base (1), and a liquid collection box (11) is pulled out and fitted inside it. The top of the liquid collection box (11) is detachably fitted with a filter plate (12).

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