Diameter detection device for balloon catheter

Abstract

The invention relates to a diameter detection device for a balloon catheter, and relates to the technical field of detection equipment, the diameter detection device comprises a supporting seat, the top of the supporting seat is fixedly connected with a supporting plate, the supporting seat is provided with a clamping and pulling assembly, the supporting plate is provided with a detection assembly, and the supporting seat is provided with a clamping and fixing assembly; the clamping and pulling assembly comprises a torsion ring, a rotating rod, a first bevel gear, a second bevel gear, a first threaded rod, a third bevel gear, a fourth bevel gear, a second threaded rod, a moving plate, a sliding plate, a moving block and a telescopic fixing mechanism. The clamping and pulling assembly is arranged to clamp and pull the catheter of the balloon catheter, so that the catheter is prevented from loosening and drooping during detection, natural state interference of the catheter is eliminated, it is ensured that diameter measurement is real and effective, meanwhile, the catheter of the balloon catheter is clamped, the situation that the catheter shakes during detection can be avoided, and the detection accuracy is improved. Therefore, the pipeline detection precision of the balloon catheter is prevented from being influenced.

Description

Technical Field

[0001] This invention relates to the field of testing equipment technology, and in particular to a diameter testing device for balloon catheters. Background Technology

[0002] A balloon catheter is an interventional medical device, mainly composed of a catheter body, an inflatable balloon, and proximal control components. It is widely used in interventional treatments in cardiovascular, neurovascular, and peripheral vascular fields. The catheter body is typically made of flexible polymer materials, possessing good delivery and flexibility, allowing it to pass through tortuous blood vessels to reach the lesion site under guidewire guidance. The catheter generally has an internal lumen for delivering contrast agents, liquids, or gases to achieve balloon inflation and deflation. The balloon portion, attached to the distal end of the catheter, is often made of a high-strength, highly elastic thin film material and is folded when uninflated, facilitating catheter delivery within the blood vessel. When contrast agents or gases are injected into the balloon through the catheter lumen, the balloon inflates to a preset diameter, applying radial pressure to the narrowed blood vessel or lesion site, achieving the therapeutic purpose of dilating the blood vessel and opening the lumen. For example, in the treatment of coronary atherosclerotic heart disease, the balloon can dilate the narrowed coronary arteries to improve myocardial blood supply. As a core device in interventional therapy for achieving vasodilation and lesion recanalization, the diameter precision of the balloon catheter directly determines clinical safety and treatment efficacy. The outer diameter of the catheter must be strictly controlled within the design tolerance range to ensure smooth passage through tortuous blood vessels and avoid vascular damage due to excessive size or unstable positioning due to insufficient size. Therefore, high-precision detection of the balloon catheter diameter is a crucial step in production quality control and before clinical application. When inspecting the diameter of balloon catheters, a rangefinder is generally used. However, due to the characteristics of the catheter itself and the limitations of the operating conditions, some problems are often encountered during the inspection. Since the catheters are mostly made of flexible polymer materials, they are prone to bending, curling, or local loosening and sagging under their own weight in a natural state. This non-rigid state will cause the cross-section collected by the inspection equipment to be non-standard circular. In this case, the rangefinder may mismeasure the diameter of the oblique section during inspection, resulting in an overestimation of the data. The material stacking in the wrinkled area may be misjudged as a bulge defect, causing qualified products to be mistakenly rejected. At the same time, although the existing inspection devices use clamping components to clamp the balloon catheter during inspection, they often lack axial tension. The lack of axial tension in the clamping method cannot eliminate the natural bending of the middle section of the catheter, making it difficult for the inspection equipment to continuously capture the complete diameter change curve and miss potential defects such as local diameter reduction and bulging. To address the aforementioned issues, this application proposes a diameter detection device for balloon catheters. Summary of the Invention

[0003] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a diameter detection device for balloon catheters, which solves the problem of catheter bending or shaking during detection.

[0004] (II) Technical Solution To achieve the above objectives, the present invention is implemented through the following technical solution: a diameter detection device for balloon catheters, including a support base, a support plate fixedly connected to the top of the support base, a clamping and pulling assembly provided on the support base, a detection assembly provided on the support plate, and a locking assembly provided on the support base; The clamping and pulling assembly includes a torsion ring, a rotating rod, a first bevel gear, a second bevel gear, a first threaded rod, a third bevel gear, a fourth bevel gear, a second threaded rod, a moving plate, a sliding plate, a moving block, and a telescopic fixing mechanism. The outer wall of the rotating rod is fixedly connected to the inner wall of the first bevel gear. The outer wall of the first threaded rod is rotatably connected to the support base. The end of the first threaded rod near the rotating rod is fixedly connected to the second bevel gear. The outer wall of the first threaded rod is threadedly connected to the bottom end of the moving block. The end of the rotating rod away from the torsion ring is fixedly connected to the outer wall of the third bevel gear. The second threaded rod is rotatably connected to the support plate. The bottom of the second threaded rod is fixedly connected to the top of the fourth bevel gear. The outer wall of the second threaded rod is threadedly connected to the moving plate. The side wall of the moving plate is slidably connected to the sliding plate.

[0005] The telescopic fixing mechanism includes a fixed sleeve, a first spring, a telescopic sleeve, a placement frame, and a lower pressure plate. The top of the moving block is fixedly connected to the outer wall of the placement frame, the bottom of the sliding plate is fixedly connected to the top of the fixed sleeve, the inner top wall of the fixed sleeve is fixedly connected to the first spring, the bottom end of the first spring is fixedly connected to the inner bottom wall of the telescopic sleeve, the telescopic sleeve is slidably connected to the fixed sleeve, and the bottom of the telescopic sleeve is fixedly connected to the bottom of the lower pressure plate. By setting the telescopic fixing mechanism, the catheters of different sizes of balloon catheters can be clamped.

[0006] The detection assembly includes an electric push rod, a movable plate, an electric telescopic rod, a connecting plate, and a rangefinder. The top of the support plate is fixedly connected to the outer wall of the electric push rod, the telescopic end of the electric push rod is fixedly connected to the side wall of the movable plate, the bottom of the movable plate is slidably connected to the top of the support plate, the bottom of the movable plate is fixedly connected to the top of the electric telescopic rod, and the bottom end of the electric telescopic rod is fixedly connected to the top of the connecting plate. By setting up the detection assembly, the catheter and balloon of the balloon catheter can be detected.

[0007] The locking assembly includes a movable tube, a plug, a rod, a first locking plate, and a second locking plate. One end of the movable tube is fixedly connected to a torsion ring, the torsion ring is fixedly connected to the outer wall of the first locking plate, the inner wall of the first locking plate is in contact with the outer wall of the movable tube, the outer wall of the support base is fixedly connected to the outer wall of the second locking plate, the rod is fixedly connected to the inner wall of the movable tube, and the plug is fixedly connected to the outer wall of the rotating rod. By setting the locking assembly, the clamping and pulling assembly is fixedly secured.

[0008] The outer wall of the second card plate is fixedly connected to a first magnetic block, and the outer wall of the first card plate is fixedly connected to a second magnetic block. The outer wall of the second magnetic block is in contact with the outer wall of the first magnetic block. This arrangement further fixes the torsion ring, thereby preventing the torsion ring from rotating during balloon catheter testing and thus avoiding affecting the testing accuracy of the balloon catheter.

[0009] A second spring is fixedly connected to the inner wall of the support plate. A rotating plate is fixedly connected to one end of the second spring near the torsion ring. The rotating plate is rotatably connected to the outer wall of the movable tube. By setting the second spring and the rotating plate, the torsion ring is reset. After the torsion ring is pulled, the torsion ring will be reset to its original position under the cooperation of the second spring and the rotating plate, thereby fixing the clamping and pulling assembly.

[0010] A support rod is fixedly connected to the top of the support base, and an arc-shaped plate is fixedly connected to the top of the support rod. By setting the support rod and the arc-shaped plate, the balloon catheter can be placed, thereby preventing the balloon catheter from detaching when clamped and pulled.

[0011] A limiting rod is fixedly connected to the bottom of the movable plate, and a limiting groove is formed on the support plate. The limiting rod is slidably connected to the limiting groove formed on the support plate. A sliding rod is fixedly connected to the sliding plate, and a sliding groove is formed on the support plate. The sliding rod is slidably connected to the sliding groove formed on the support plate. By setting the limiting rod, limiting groove, sliding rod, and sliding groove, the sliding plate and the movable plate are limited. The limiting rod and limiting groove can prevent the movable plate from shaking when moving up and down, and the sliding rod and sliding groove can prevent the sliding plate from shaking when moving left and right.

[0012] The bottom of the pressure plate is fixedly connected to a second soft pad, and the inner wall of the placement frame is fixedly connected to a first soft pad. By setting the first soft pad and the second soft pad, the balloon catheter is protected to prevent the balloon catheter from rupturing when clamped.

[0013] (III) Beneficial Effects In summary, this application includes at least one of the following beneficial technical effects: 1. A diameter detection device for balloon catheters, which, by setting up a clamping and pulling component, clamps and pulls the balloon catheter to prevent the catheter from slackening and sagging during detection, thereby eliminating interference from the natural state of the catheter and ensuring the accuracy and effectiveness of the diameter measurement. At the same time, clamping the balloon catheter can prevent the tube from shaking during detection, thereby avoiding affecting the accuracy of the balloon catheter tube detection.

[0014] 2. A diameter detection device for balloon catheters, which, by setting a telescopic fixing mechanism, enables the clamping of balloon catheters of different sizes. This eliminates the need for frequent clamping when different balloon catheters need to be clamped, thus improving operational efficiency. At the same time, the telescopic fixing mechanism can avoid excessive clamping force during clamping, thereby improving the adaptability of clamping force and reducing the risk of catheter damage.

[0015] 3. A diameter detection device for balloon catheters, which uses a locking component to fix the clamping and pulling component, thereby preventing the clamping and pulling component from loosening during balloon catheter testing. This eliminates force deviation during balloon catheter testing, ensuring the accuracy and validity of the test data. At the same time, it prevents the locking component from suddenly loosening and causing the balloon catheter to come into contact with the equipment, thus protecting the catheter and equipment and reducing accidental damage. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the rotating rod and related parts of the present invention; Figure 3 This is a schematic diagram of the rangefinder and related components of the present invention; Figure 4 This is a schematic diagram of the lower pressure plate and related parts of the present invention; Figure 5 This is a schematic diagram of the active tube and related parts of the present invention; Figure 6 This is a schematic diagram of the insert block and related parts of the present invention; Figure 7 This is a schematic diagram of the first card plate and its related parts of the present invention.

[0017] Explanation of reference numerals in the attached figures: 1. Support base; 2. Support plate; 3. Torsion ring; 4. Rotating rod; 5. First bevel gear; 6. Second bevel gear; 7. First threaded rod; 8. Third bevel gear; 9. Fourth bevel gear; 10. Second threaded rod; 11. Moving plate; 12. Sliding plate; 13. Moving block; 14. Fixed sleeve; 15. Electric push rod; 16. Movable plate; 17. Electric telescopic rod; 18. Connecting plate; 19. Rangefinder; 20. First spring ; 21. Telescopic sleeve; 22. Placement frame; 23. Lower pressure plate; 24. Movable tube; 25. Insert block; 26. Insert rod; 27. First clamping plate; 28. Second clamping plate; 29. ​​First magnetic block; 30. Second magnetic block; 31. Second spring; 32. Rotating plate; 33. Support rod; 34. Arc plate; 35. Limiting rod; 36. Limiting groove; 37. Sliding rod; 38. Sliding groove; 39. First soft pad; 40. Second soft pad. Detailed Implementation

[0018] The following is in conjunction with the appendix Figure 1 - Appendix Figure 7 This application will be described in further detail below.

[0019] Example: A diameter detection device for balloon catheters, referring to... Figure 1-7 It includes a support base 1, a support plate 2 is fixedly connected to the top of the support base 1, the support base 1 is used to fix the support plate 2, a clamping and pulling component is provided on the support base 1, a detection component is provided on the support plate 2, and a locking component is provided on the support base 1. The clamping and pulling assembly includes a torsion ring 3, a rotating rod 4, a first bevel gear 5, a second bevel gear 6, a first threaded rod 7, a third bevel gear 8, a fourth bevel gear 9, a second threaded rod 10, a moving plate 11, a sliding plate 12, a moving block 13, and a telescopic fixing mechanism. The outer wall of the rotating rod 4 is fixedly connected to the inner wall of the first bevel gear 5. The torsion ring 3 allows the user to easily rotate the rotating rod 4. The rotation of the rotating rod 4 drives the first bevel gear 5 to rotate. The outer wall of the first threaded rod 7 is rotatably connected to the support base 1. The end of the first threaded rod 7 near the rotating rod 4 is fixedly connected to the second bevel gear 6. The rotation of the first bevel gear 5 drives the second bevel gear 6 to rotate, and the rotation of the second bevel gear 6 drives the first threaded rod 10. 7 rotates, the outer wall of the first threaded rod 7 is threadedly connected to the bottom end of the moving block 13, the rotation of the first threaded rod 7 can drive the moving block 13 to move, the end of the rotating rod 4 away from the torsion ring 3 is fixedly connected to the outer wall of the third bevel gear 8, the second threaded rod 10 is rotatably connected to the support plate 2, the bottom of the second threaded rod 10 is fixedly connected to the top of the fourth bevel gear 9, the rotation of the rotating rod 4 can drive the fourth bevel gear 9 to rotate through the third bevel gear 8, the outer wall of the second threaded rod 10 is threadedly connected to the moving plate 11, the rotation of the fourth bevel gear 9 can drive the second threaded rod 10 to rotate, the side wall of the moving plate 11 is slidably connected to the sliding plate 12, the rotation of the moving plate 11 drives the sliding plate 12 to move up and down.

[0020] Reference Figure 4 The telescopic fixing mechanism includes a fixed sleeve 14, a first spring 20, a telescopic sleeve 21, a placement frame 22, and a lower pressure plate 23. The top of the moving block 13 is fixedly connected to the outer wall of the placement frame 22. The moving block 13 is used to fix the placement frame 22. The placement frame 22 is used to support the catheter of the balloon catheter. The bottom of the sliding plate 12 is fixedly connected to the top of the fixed sleeve 14. The inner top wall of the fixed sleeve 14 is fixedly connected to the first spring 20. The fixed sleeve 14 is used to fix the first spring 20. The bottom end of the first spring 20 is fixedly connected to the inner bottom wall of the telescopic sleeve 21. The first spring 20 can cause the telescopic sleeve 21 to return to its original position after the telescopic sleeve 21 moves. The telescopic sleeve 21 is slidably connected to the fixed sleeve 14. The bottom of the telescopic sleeve 21 is fixedly connected to the bottom of the lower pressure plate 23. The lower pressure plate 23 is used to clamp the catheter of the balloon catheter.

[0021] Reference Figure 3The detection assembly includes an electric push rod 15, a movable plate 16, an electric telescopic rod 17, a connecting plate 18, and a rangefinder 19. The top of the support plate 2 is fixedly connected to the outer wall of the electric push rod 15. The telescopic end of the electric push rod 15 is fixedly connected to the side wall of the movable plate 16. The electric push rod 15 can push the movable plate 16 to move. The bottom of the movable plate 16 is slidably connected to the top of the support plate 2. The bottom of the movable plate 16 is fixedly connected to the top of the electric telescopic rod 17. The movable plate 16 is used to fix the electric telescopic rod 17. The bottom end of the electric telescopic rod 17 is fixedly connected to the top of the connecting plate 18. The electric telescopic rod 17 can fix the connecting plate 18 and make the connecting plate 18 move up and down. The rangefinder 19 is used to detect the diameter of the balloon catheter.

[0022] Reference Figure 5-7 The locking assembly includes a movable tube 24, an insert block 25, an insert rod 26, a first locking plate 27, and a second locking plate 28. One end of the movable tube 24 is fixedly connected to the torsion ring 3. The torsion ring 3 is fixedly connected to the outer wall of the first locking plate 27. The inner wall of the first locking plate 27 is in contact with the outer wall of the movable tube 24. The outer wall of the support base 1 is fixedly connected to the outer wall of the second locking plate 28. The cooperation of the first locking plate 27 and the second locking plate 28 can fix the torsion ring 3, thereby preventing the torsion ring 3 from rotating during the use of the balloon catheter. The insert rod 26 is fixedly connected to the inner wall of the movable tube 24, and the insert block 25 is fixedly connected to the outer wall of the rotating rod 4. The cooperation of the insert block 25 and the insert rod 26 can make the rotation of the torsion ring 3 drive the rotation of the rotating rod 4.

[0023] Reference Figure 7 The outer wall of the second card plate 28 is fixedly connected to the first magnetic block 29, which is sleeved on the outside of the first card plate 27. The outer wall of the first card plate 27 is fixedly connected to the second magnetic block 30, which is in contact with the outer wall of the first magnetic block 29. The first magnetic block 29 is sleeved on the outside of the second card plate 28. The cooperation between the second magnetic block 30 and the first magnetic block 29 can prevent the torsion ring 3 from rotating during balloon catheter detection, thereby avoiding affecting the detection accuracy of the balloon catheter.

[0024] Reference Figure 5 and Figure 6 A second spring 31 is fixedly connected to the inner wall of the support plate 2. A rotating plate 32 is fixedly connected to one end of the second spring 31 near the torsion ring 3. The second spring 31 is used to reset the torsion ring 3 to its original position after the torsion ring 3 moves. The rotating plate 32 is rotatably connected to the outer wall of the movable tube 24. The use of the rotating plate 32 can prevent the second spring 31 from affecting the rotation of the torsion ring 3.

[0025] Reference Figure 1The top of the support base 1 is fixedly connected to a support rod 33. There are two support rods 33. The top of the support rod 33 is fixedly connected to an arc plate 34. The arc plate 34 is used to place the support rod 33 to prevent the balloon catheter from detaching when it is clamped and pulled.

[0026] Reference Figure 3 and Figure 4 A limiting rod 35 is fixedly connected to the bottom of the movable plate 11, and a limiting groove 36 is opened on the support plate 2. The limiting rod 35 is slidably connected to the limiting groove 36 opened on the support plate 2. The cooperation between the limiting rod 35 and the limiting groove 36 can prevent the movable plate 11 from shaking when moving up and down. A sliding rod 37 is fixedly connected to the sliding plate 12, and a sliding groove 38 is opened on the support plate 2. The sliding rod 37 is slidably connected to the sliding groove 38 opened on the support plate 2. The cooperation between the sliding rod 37 and the sliding groove 38 can prevent the sliding plate 12 from shaking when moving.

[0027] Reference Figure 4 The bottom of the lower pressure plate 23 is fixedly connected to a second soft pad 40. The number of second soft pads 40 is the same as the number of lower pressure plates 23. The inner wall of the placement frame 22 is fixedly connected to a first soft pad 39. The number of first soft pads 39 is the same as the number of placement frames 22. The use of the first soft pad 39 and the second soft pad 40 together can prevent the balloon catheter from being damaged when it is clamped.

[0028] The implementation principle of this application embodiment is as follows: When it is necessary to detect the diameter of the balloon catheter, first place both ends of the balloon catheter on the placement frame 22, and then pull the torsion ring 3. After the torsion ring 3 moves, the movable tube 24 will move. The movement of the movable tube 24 will cause the insertion rod 26 to be inserted into the insertion block 25. At this time, the torsion ring 3 can drive the rotating rod 4 to rotate. The rotation of the rotating rod 4 will drive the second bevel gear 6 to rotate through the first bevel gear 5. The rotation of the second bevel gear 6 will drive the first threaded rod 7 to rotate. The rotation of the first threaded rod 7 will drive the moving block 13 to move. After the moving block 13 moves, it will drive the placement frame 22 and the sliding plate 12 to move. At the same time, the rotation of the rotating rod 4 will also drive the third bevel gear 8 to rotate. The rotation of the third bevel gear 8 will drive the first threaded rod 7 to rotate. The rotation of the first threaded rod 7 will drive the moving block 13 to move. After the moving block 13 moves, it will drive the placement frame 22 and the sliding plate 12 to move. At the same time, the rotation of the rotating rod 4 will also drive the third bevel gear 8 to rotate. The four bevel gear 9 and the second threaded rod 10 rotate, which drives the moving plate 11 to move up and down. This causes the fixing sleeve 14 to drive the telescopic sleeve 21 and the placement frame 22 to clamp the tube, thereby clamping and pulling the balloon catheter. After the balloon catheter is clamped, the user releases the torsion ring 3. At this time, the second spring 31 will drive the torsion ring 3 to return to its original position, so that the first clamping plate 27 and the second clamping plate 28 are engaged with each other, thereby fixing the torsion ring 3. After the moving block 13 is fixed, the electric push rod 15 can drive the movable plate 16 and the rangefinder 19 to move to the required detection position. After moving to the detection position, the electric telescopic rod 17 can drive the connecting plate 18 and the rangefinder 19 to move, thereby facilitating the detection of the diameter of the balloon catheter.

[0029] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A diameter detection device for balloon catheters, comprising a support base (1), characterized in that: The top of the support base (1) is fixedly connected to a support plate (2), a clamping and pulling assembly is provided on the support base (1), a detection assembly is provided on the support plate (2), and a locking assembly is provided on the support base (1). The clamping and pulling assembly includes a torsion ring (3), a rotating rod (4), a first bevel gear (5), a second bevel gear (6), a first threaded rod (7), a third bevel gear (8), a fourth bevel gear (9), a second threaded rod (10), a moving plate (11), a sliding plate (12), a moving block (13), and a telescopic fixing mechanism. The outer wall of the rotating rod (4) is fixedly connected to the inner wall of the first bevel gear (5), and the outer wall of the first threaded rod (7) is rotatably connected to the support base (1). The end of the first threaded rod (7) near the rotating rod (4) is... The first threaded rod (7) is fixedly connected to the second bevel gear (6), the outer wall of the first threaded rod (7) is threadedly connected to the bottom end of the moving block (13), the end of the rotating rod (4) away from the torsion ring (3) is fixedly connected to the outer wall of the third bevel gear (8), the second threaded rod (10) is rotatably connected to the support plate (2), the bottom of the second threaded rod (10) is fixedly connected to the top of the fourth bevel gear (9), the outer wall of the second threaded rod (10) is threadedly connected to the moving plate (11), and the side wall of the moving plate (11) is slidably connected to the sliding plate (12).

2. The diameter detection device for balloon catheters according to claim 1, characterized in that: The telescopic fixing mechanism includes a fixed sleeve (14), a first spring (20), a telescopic sleeve (21), a placement frame (22), and a lower pressure plate (23). The top of the moving block (13) is fixedly connected to the outer wall of the placement frame (22), the bottom of the sliding plate (12) is fixedly connected to the top of the fixed sleeve (14), the inner top wall of the fixed sleeve (14) is fixedly connected to the first spring (20), the bottom end of the first spring (20) is fixedly connected to the inner bottom wall of the telescopic sleeve (21), the telescopic sleeve (21) is slidably connected to the fixed sleeve (14), and the bottom of the telescopic sleeve (21) is fixedly connected to the bottom of the lower pressure plate (23).

3. The diameter detection device for balloon catheters according to claim 1, characterized in that: The detection assembly includes an electric push rod (15), a movable plate (16), an electric telescopic rod (17), a connecting plate (18), and a rangefinder (19). The top of the support plate (2) is fixedly connected to the outer wall of the electric push rod (15), the telescopic end of the electric push rod (15) is fixedly connected to the side wall of the movable plate (16), the bottom of the movable plate (16) is slidably connected to the top of the support plate (2), the bottom of the movable plate (16) is fixedly connected to the top of the electric telescopic rod (17), and the bottom end of the electric telescopic rod (17) is fixedly connected to the top of the connecting plate (18).

4. The diameter detection device for balloon catheters according to claim 1, characterized in that: The locking assembly includes a movable tube (24), a plug (25), a plug rod (26), a first locking plate (27), and a second locking plate (28). One end of the movable tube (24) is fixedly connected to a torsion ring (3). The torsion ring (3) is fixedly connected to the outer wall of the first locking plate (27). The inner wall of the first locking plate (27) is in contact with the outer wall of the movable tube (24). The outer wall of the support base (1) is fixedly connected to the outer wall of the second locking plate (28). The plug rod (26) is fixedly connected to the inner wall of the movable tube (24). The plug (25) is fixedly connected to the outer wall of the rotating rod (4).

5. The diameter detection device for balloon catheters according to claim 4, characterized in that: The outer wall of the second card plate (28) is fixedly connected to the first magnetic block (29), and the outer wall of the first card plate (27) is fixedly connected to the second magnetic block (30). The outer wall of the second magnetic block (30) is in contact with the outer wall of the first magnetic block (29).

6. The diameter detection device for balloon catheters according to claim 1, characterized in that, The inner wall of the support plate (2) is fixedly connected to a second spring (31), and the end of the second spring (31) near the torsion ring (3) is fixedly connected to a rotating plate (32). The rotating plate (32) is rotatably connected to the outer wall of the movable tube (24).

7. The diameter detection device for balloon catheters according to claim 1, characterized in that: The top of the support base (1) is fixedly connected to a support rod (33), and the top of the support rod (33) is fixedly connected to an arc plate (34).

8. The diameter detection device for balloon catheters according to claim 1, characterized in that: The bottom of the movable plate (11) is fixedly connected to a limiting rod (35), and a limiting groove (36) is opened on the support plate (2). The limiting rod (35) is slidably connected to the limiting groove (36) opened on the support plate (2). A sliding rod (37) is fixedly connected on the sliding plate (12), and a sliding groove (38) is opened on the support plate (2). The sliding rod (37) is slidably connected to the sliding groove (38) opened on the support plate (2).

9. The diameter detection device for balloon catheters according to claim 2, characterized in that: The bottom of the lower pressure plate (23) is fixedly connected to a second soft pad (40), and the inner wall of the placement frame (22) is fixedly connected to a first soft pad (39).

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