Medical catheter variable diameter stretching machine

Abstract

The application discloses a medical catheter variable-diameter stretching machine and relates to the field of plastic catheter stretching. The machine comprises a machine base, a clamping device for clamping a catheter is arranged on the machine base, a sliding seat is slidably connected to the machine base, a first driving piece for driving the sliding seat to slide is arranged on the machine base, a heating plate is arranged on the sliding seat, a plurality of heating pieces for heating the heating plate are arranged on the heating plate, a plurality of variable-diameter holes are formed in the heating plate, a guide seat is arranged on the sliding seat, a plurality of guide grooves are formed in the guide seat, the plurality of guide grooves are arranged in one-to-one correspondence with the plurality of variable-diameter holes, and a locking plate for closing the guide grooves is rotatably connected to the guide seat. According to the application, the balloon catheter can be more accurately aligned with the variable-diameter holes, the processing effect of the balloon catheter is ensured, and the convenience of using the stretching machine is improved.

Description

Technical Field

[0001] This application relates to the field of plastic catheter stretching, and more particularly to a medical catheter diameter-reducing stretching machine. Background Technology

[0002] With the advancement of medical technology, medical catheters now play a crucial role and hold a significant position in clinical medicine. Balloon catheters, as a type of medical catheter, are experiencing increasing consumption in my country year by year. As an important means of treating cardiovascular diseases, balloon catheters have enormous market demand and broad prospects.

[0003] In the prior art, a balloon catheter diameter-reducing stretching machine includes a base, a clamping seat and a diameter-reducing seat on the base, a driving component on the base for driving the diameter-reducing seat away from the clamping seat, a clamping device on the clamping seat for clamping the balloon catheter, and a heating plate on the diameter-reducing seat with a diameter-reducing hole. During use, the balloon catheter passes through the clamping device fixed by the diameter-reducing hole, and with the heating of the heating plate, the function of the diameter-reducing balloon catheter can be achieved.

[0004] Regarding the aforementioned existing technology, the balloon catheter can be more easily changed in diameter during use with the help of the diameter-changing hole on the heating plate. However, when stretching the balloon catheter, it is prone to misalignment, which prevents the balloon catheter from accurately entering the diameter-changing hole, affecting the processing effect of the balloon catheter, and urgently needs to be improved. Summary of the Invention

[0005] In order to enable balloon catheters to be more accurately aligned with the diameter-changing orifice, ensure the processing effect of balloon catheters, and improve the convenience of using the stretching machine, this application provides a medical catheter diameter-changing stretching machine.

[0006] The medical catheter diameter reducing and stretching machine provided in this application adopts the following technical solution:

[0007] The device includes a base, on which a clamping device for holding a guide tube is provided. A sliding seat is slidably connected to the base. A first driving member for driving the sliding seat to slide is provided on the base. A heating plate is provided on the sliding seat. A plurality of heating elements for heating the heating plate are provided on the heating plate. A plurality of diameter-changing holes are opened on the heating plate. A guide seat is provided on the sliding seat. A plurality of guide grooves are opened on the guide seat. The plurality of guide grooves are arranged one-to-one with the plurality of diameter-changing holes. A locking plate for closing the guide grooves is rotatably connected to the guide seat.

[0008] By adopting the above technical solution, during use, the guide tube is placed on the guide groove, the locking plate is closed, the guide tube is passed through the diameter reducing hole and fixed to the clamping device, thus completing the initial preparation work. Then, in conjunction with the first driving component, the sliding seat is moved, thereby achieving the purpose of pulling the guide tube to deform and shrink, meeting the processing requirements of the guide tube. This design allows the guide tube to be guided through the guide groove, enabling the guide tube to be more accurately aligned with the diameter reducing hole, and better ensuring the processing effect of the guide tube.

[0009] Preferably, the base has a limiting slide cavity, which is opened along the sliding direction of the sliding seat. Multiple rows of limiting slide plates are slidably connected in the limiting slide cavity. A connecting rod is provided between the limiting slide plate near the heating plate and the heating plate. Limiting baffles are provided on both sides of the limiting slide plate. The height of the multiple limiting baffles gradually increases along the direction near the sliding seat. Multiple sets of limiting blocks are provided on the limiting slide cavity. The height of each set of limiting blocks gradually increases along the direction away from the clamping device. The height of each set of limiting blocks corresponds to the height of the limiting baffle. The limiting slide plate has a mounting hole, which is opened through multiple sets of limiting slide plates. The mounting hole is coaxial with the diameter changing hole. Multiple abutment pieces are hinged to the inner wall of the mounting hole. The abutment pieces are inclined downward along the direction away from the guide seat. The multiple abutment pieces form a locking cavity for clamping the guide tube. A fixing spring is provided on the inner wall of the mounting hole for driving the abutment pieces to press against the inner wall of the guide tube.

[0010] By adopting the above technical solution, the stretching distance of the conduit is large during use. When the heated conduit is separated from the reducing hole, the conduit is subjected to a large tensile force. The limiting slide stops sliding under the action of the limiting baffle and the limiting block, and holds the conduit tightly under the action of the abutment piece, assisting in stretching the conduit. With the cooperation of multiple limiting slides, the conduit is limited, reducing the increased tensile force when the conduit is long, which affects the forming effect of the conduit and improves the stability of conduit manufacturing.

[0011] Preferably, a cooling column is installed on the limiting slide plate near the heating plate. The cooling column is inserted into the mounting hole and is coaxial with the mounting hole. A cooling cavity for a conduit to pass through is opened through the axis of the cooling column. A circulation cavity is opened inside the cooling column. An inlet hole and a drain hole connected to the cooling cavity are opened on the cooling column. The outer diameter of the cooling column gradually decreases in the direction away from the heating plate. Furthermore, during the return process, the abutment piece can be directly pushed back, improving the stability of the limiting slide plate.

[0012] By adopting the above technical solution, during use, the cooling column is inserted into the mounting hole, and the abutment piece abuts against the outer wall of the cooling column. When the limiting baffle and the limiting block block, the abutment piece can slide off the cooling column and hold the conduit tightly, reducing the wear of the abutment piece on the surface of the conduit. Furthermore, the use of the cooling column can reduce the temperature of the conduit in a timely manner, thereby enabling the conduit to be formed more quickly and ensuring the accuracy of conduit processing.

[0013] Preferably, a male magnetic block and a female magnetic block are respectively provided on two adjacent limiting slide plates, and the male magnetic block and the female magnetic block attract each other.

[0014] By adopting the above technical solution, two adjacent limiting slides can be connected more stably, thereby improving the stability of the limiting slides in use.

[0015] Preferably, a laser measuring instrument is provided on the heating plate, the laser measuring instrument includes multiple laser emitters disposed on the heating plate, and a laser displacement sensor for detecting laser offset is disposed at the bottom of the heating plate.

[0016] By adopting the above technical solution, the laser emitter, in conjunction with the laser position sensor, can sense the refraction deviation of the laser, thereby enabling more accurate detection of the thickness of the guide tube after diameter change, ensuring the precision of guide tube processing.

[0017] Preferably, the heating plate consists of a heating base fixed on the slide and a tension seat rotatably connected to the heating base. The tension seat is hinged towards the guide seat, and the two ends of the connecting rod are rotatably connected to the tension seat and the limiting slide plate, respectively.

[0018] By adopting the above technical solution, during use, when the conduit is stretched, the stretching seat is set vertically, and the diameter of the conduit can be changed with the help of the connecting rod. After stretching is completed, the stretching seat moves closer to the clamping device. Under the action of the connecting rod, the stretching seat is tilted, so that the stretching seat can be flattened and the conduit can slide on the stretching seat. Thus, when the sliding seat is reset, the conduit can be guided out, improving the convenience of picking up the conduit.

[0019] Preferably, the bottom of the limiting slide cavity has multiple sets of limiting slides, the limiting block is slidably connected to the limiting slide, and the side of the limiting slide away from the clamping device is provided with an abutment spring, which is used to push the limiting slide away from the heating plate.

[0020] By adopting the above technical solution, during use, the abutment spring can move away from the heating plate when the limiting slide slides out, so that the abutment piece can more stably hold and pull the tube, improving the stability of the tube auxiliary fixation.

[0021] Preferably, a heating assembly is sleeved inside the guide groove. The heating assembly is composed of several U-shaped sleeves that are interlocked with each other. The upper end of each U-shaped sleeve has a heating cavity for placing a conduit. Adjacent U-shaped sleeves are interlocked with the heating cavity. An auxiliary heating strip is provided inside the U-shaped sleeve. A sliding groove is provided at the bottom of the U-shaped sleeve. The sliding groove is opened along the length of the U-shaped sleeve. A positioning block is slidably connected inside the sliding groove. An auxiliary compression spring is provided inside the sliding groove for pushing the positioning block closer to the heating plate. A positioning hole is provided inside the heating cavity to interlock with the positioning block.

[0022] By adopting the above technical solution, different numbers of U-shaped sleeves are installed according to the size of the catheter during use, which can better adapt to the guiding work of the catheter. During use, as the catheter is pulled, the U-shaped sleeves can slide, thereby guiding the catheter step by step. On the one hand, this can improve the stability and smoothness of catheter guidance, and on the other hand, it can allow the catheter to have a longer heating length, improve the preheating effect of the catheter, and improve the effect and stability of catheter diameter change.

[0023] Preferably, the end of the U-shaped sleeve away from the heating plate has an involute slope, which is inclined outward in a direction away from the U-shaped sleeve.

[0024] By adopting the above technical solution, the involute bevel can reduce damage to the catheter caused by sharp edges and improve the ease of guiding the catheter.

[0025] Preferably, a first magnetic block is provided at the bottom of the positioning insert, and a second magnetic block that attracts the first magnetic block is provided at the bottom of the sliding groove.

[0026] By adopting the above technical solution, the U-shaped sleeve can be fixed more stably through the mutual attraction between the first magnetic block and the second magnetic block.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. During use, place the guide tube on the guide groove, close the locking plate, pass the guide tube through the diameter reducing hole and fix it to the clamping device to complete the initial preparation work. Then, with the first drive component, pull the sliding seat to move, thereby achieving the purpose of pulling the guide tube to deform and shrink, meeting the processing requirements of the guide tube. This design allows the guide tube to be guided by the guide groove, which can make the guide tube more accurately aligned with the diameter reducing hole and better ensure the processing effect of the guide tube.

[0029] 2. During use, the stretching distance of the conduit is relatively large. When the heated conduit is separated from the reducing hole, the conduit is subjected to a large tensile force. The limiting slide stops sliding under the action of the limiting baffle and the limiting block, and holds the conduit tightly under the action of the abutment piece, assisting in stretching the conduit. Multiple limiting slides are used to limit the conduit, reducing the increased tensile force when the conduit is long, which affects the forming effect of the conduit and improves the stability of conduit manufacturing.

[0030] 3. During use, the cooling column is inserted into the mounting hole, so that the abutment piece abuts against the outer wall of the cooling column. When the limiting baffle and the limiting block block, the abutment piece can slide off the cooling column and hold the conduit tightly, reducing the wear of the abutment piece on the conduit surface. In addition, the cooling column can reduce the temperature of the conduit in time, so that the conduit can be formed more quickly and ensure the accuracy of conduit processing. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of a medical catheter diameter reducing and stretching machine according to Embodiment 1 of this application;

[0032] Figure 2 This is an enlarged schematic diagram of part A in Figure 1;

[0033] Figure 3 This is a schematic diagram illustrating the limiting slide structure, which is the main feature of Embodiment 2 of this application.

[0034] Figure 4 for Figure 3 An enlarged schematic diagram of section D in the middle;

[0035] Figure 5 This is a schematic diagram illustrating the limiting block structure in Embodiment 2 of this application;

[0036] Figure 6 for Figure 5 Enlarged schematic diagram of part B in the middle;

[0037] Figure 7 This is a schematic diagram illustrating the U-shaped sleeve structure in Embodiment 3 of this application;

[0038] Figure 8 for Figure 7 An enlarged schematic diagram of section C;

[0039] Figure 9 This is a schematic diagram illustrating the side structure of the U-shaped sleeve, which is the main feature of Embodiment 3 of this application.

[0040] Reference numerals: 1. Clamping seat; 2. Sliding seat; 3. Machine base; 4. Clamping drive cylinder; 5. Clamping top seat; 6. Clamping base; 7. Heating plate; 71. Variable diameter hole; 72. Heating base; 73. Tensioning seat; 9. Guide seat; 10. Guide groove; 11. Locking plate; 12. Laser emitter; 13. Laser displacement sensor; 14. Limiting slide plate; 15. Fixing spring; 16. Abutment piece; 17. Mounting hole; 18. Limiting stop; 19. Inlet 20. Liquid hole; 21. Cooling column; 22. Cooling chamber; 23. Circulation chamber; 24. Drain hole; 25. Male magnetic block; 26. Female magnetic block; 27. Abutment spring; 28. Limiting slide; 29. ​​Limiting stop; 30. Limiting baffle; 31. U-shaped sleeve; 31. Involute slope; 32. Positioning insert; 33. First magnetic block; 34. Second magnetic block; 35. Positioning insertion hole; 36. Auxiliary heating strip; 37. Auxiliary compression spring; 38. Sliding groove; 39. Heating chamber. Detailed Implementation

[0041] The following is in conjunction with the appendix Figure 1 - Figure 9 This application will be described in further detail.

[0042] This application discloses a medical catheter diameter reducing and stretching machine.

[0043] Example 1;

[0044] Reference Figure 1 A medical catheter diameter-changing and stretching machine includes a base 3, on which a clamping device for holding catheters is mounted. A sliding seat 2 is slidably connected to the base 3. A first driving component for driving the sliding seat 2 to slide is mounted on the base 3. The first driving component consists of a first driving motor and a first screw, which is threadedly engaged with the sliding seat 2 to drive the sliding seat 2 to slide. A heating plate 7 is mounted on the sliding seat 2, and multiple heating elements for heating the heating plate 7 are mounted on the heating plate 7. The heating elements are electrically heated. Multiple diameter-changing holes 71 are formed on the heating plate 7. The diameter-changing holes 71 are tapered, thereby enabling the catheter to be diameter-changed. A guide seat 9 is mounted on the sliding seat 2, and multiple guide grooves 10 are formed on the guide seat 9. The multiple guide grooves 10 are arranged one-to-one with the multiple diameter-changing holes 71. A locking plate 11 for closing the guide grooves 10 is rotatably connected to the guide seat 9.

[0045] The clamping device includes a clamping seat 1 mounted on a base 3. The clamping seat 1 has a clamping cavity, and a clamping base 6 is fixed to the bottom of the cavity. A clamping top seat 5 is vertically connected to the clamping base 6. A clamping drive cylinder 4 is provided on the clamping seat 1 to drive the clamping top seat 5 to move up and down. Through the cooperation of the clamping top seat 5 and the clamping base 6, the catheter can be limited, improving the convenience of catheter clamping.

[0046] The implementation principle of a medical catheter diameter reducing and stretching machine according to an embodiment of this application is as follows: During use, the catheter is placed on the guide groove 10, the locking plate 11 is closed, the catheter is passed through the diameter reducing hole 71 and fixed to the clamping device, thus completing the initial preparation work. Then, the first driving component pulls the sliding seat 2 to move, thereby achieving the purpose of stretching the catheter to deform and shrink, meeting the processing requirements of the catheter. With this design, the catheter can be guided by the guide groove 10, which can make the catheter more accurately aligned with the diameter reducing hole 71, and better ensure the processing effect of the catheter.

[0047] Example 2;

[0048] Reference Figure 3 The difference between this embodiment and Embodiment 1 is that a limiting slide cavity is formed on the base 3, which is formed along the sliding direction of the sliding seat 2. Multiple rows of limiting slide plates 14 are slidably connected inside the limiting slide cavity. A connecting rod is installed between the limiting slide plate 14 near the heating plate 7 and the heating plate 7. Limiting baffles 30 are installed on both sides of the limiting slide plate 14. The height of the multiple limiting baffles 30 gradually increases along the direction near the sliding seat 2. Multiple sets of limiting blocks 29 are installed on the limiting slide cavity, and the height of each set of limiting blocks 29 is [not specified]. The height of the limit baffle 30 is set to correspond to the height of the limit slide plate 14. The limit slide plate 14 is provided with a mounting hole 17. The mounting hole 17 is opened through multiple sets of limit slide plates 14. The mounting hole 17 is opened coaxially with the diameter changing hole 71. Multiple abutment pieces 16 are hinged to the inner wall of the mounting hole 17. The abutment pieces 16 are inclined downward in the direction away from the guide seat 9. The multiple abutment pieces 16 form a locking cavity for clamping the guide tube. A fixing spring 15 is installed on the inner wall of the mounting hole 17 for driving the abutment pieces 16 to press against the inner wall of the guide tube.

[0049] A cooling column 20 is installed on the limiting slide plate 14 near the heating plate 7. The cooling column 20 is inserted into the mounting hole 17 and is coaxial with the mounting hole 17. The limiting slide plate 14 is provided with a limiting stop 18 that engages with the cooling column 20. A cooling cavity 21 for the passage of a conduit is opened through the axis of the cooling column 20. A circulation cavity 22 is opened inside the cooling column 20. An inlet hole 19 and a drain hole 23 connected to the cooling cavity 21 are opened on the cooling column 20. The outer diameter of the cooling column 20 gradually decreases in the direction away from the heating plate 7. Furthermore, during the return process, the abutment piece 16 can be directly pushed back, improving the stability of the limiting slide plate 14 in use.

[0050] A male magnetic block 25 and a female magnetic block 26 are respectively installed on two adjacent limiting plates, and the male magnetic block 25 and the female magnetic block 26 attract each other. This allows the two adjacent limiting slide plates 14 to be stably connected together.

[0051] A laser measuring instrument is installed on the heating plate 7. The laser measuring instrument includes multiple laser emitters 12 mounted on the heating plate 7. A laser displacement sensor 13 for detecting laser offset is fixed at the bottom of the heating plate 7. The laser emitters 12 and the laser displacement sensor 13 work together to sense the refraction deviation of the laser, thereby enabling more accurate detection of the thickness of the guide tube after diameter change, ensuring the accuracy of guide tube processing.

[0052] The heating plate 7 consists of a heating base 72 fixed on the slide and a tension seat 73 rotatably connected to the heating base 72. The tension seat 73 is hinged towards the guide seat 9. The two ends of the connecting rod are rotatably connected to the tension seat 73 and the limiting slide plate 14, respectively. Multiple limiting slides 28 are provided at the bottom of the limiting slide cavity. The limiting block 29 is slidably connected to the limiting slide 28. An abutment spring 27 is installed on the side of the limiting slide 28 away from the clamping device. The abutment spring 27 is used to push the limiting slide plate 14 away from the heating plate 7, so that the abutment piece 16 can better grip and tighten the guide tube.

[0053] The implementation principle of Example 2 is as follows: During use, the stretching distance of the conduit is relatively large. When the heated conduit is separated from the reducing hole 71, the conduit is subjected to a large tensile force. The limiting slide plate 14 stops sliding under the action of the limiting baffle 30 and the limiting block 29, and holds the conduit tightly under the action of the abutment piece 16, assisting in stretching the conduit. Multiple limiting slide plates 14 are used to limit the conduit, reducing the increased tensile force when the conduit is long, which affects the forming effect of the conduit and improves the stability of the conduit manufacturing.

[0054] Example 3;

[0055] Reference Figure 7 The difference between this embodiment and Embodiment 1 is that a heating assembly is fitted inside the guide groove 10. The heating assembly consists of several U-shaped sleeves 31 that are interlocked. The U-shaped sleeves 31 are U-shaped, and a heating cavity 39 for placing a conduit is opened at the upper end of the U-shaped sleeve 31. Adjacent U-shaped sleeves 31 are interlocked with the heating cavity 39, so that multiple U-shaped sleeves 31 of different sizes can be fitted together. An auxiliary heating strip 36 is installed inside the U-shaped sleeve 31. A sliding groove 38 is opened at the bottom of the U-shaped sleeve 31. The sliding groove 38 is a T-shaped groove and is opened along the length of the U-shaped sleeve 31. A positioning plug 32 is slidably connected inside the sliding groove 38. An auxiliary compression spring 37 for pushing the positioning plug 32 closer to the heating plate 7 is installed inside the sliding groove 38. A positioning insertion hole 35 is opened inside the heating cavity 39 to interlock with the positioning plug 32.

[0056] The end of the U-shaped sleeve 31 away from the heating plate 7 has an involute slope 311, which is inclined outward in the direction away from the U-shaped sleeve 31. The bottom of the positioning block 32 is equipped with a first magnetic block 33, and the bottom of the sliding groove 38 is equipped with a second magnetic block 34 that attracts the first magnetic block 33.

[0057] The implementation principle of Example 3 is as follows: During use, different numbers of U-shaped sleeves 31 are installed according to the size of the conduit, so as to better adapt to the guiding work of the conduit. During use, as the conduit is pulled, the U-shaped sleeves 31 can slide, thereby guiding the conduit step by step. On the one hand, it can improve the stability and smoothness of the conduit guidance. On the other hand, it can allow the conduit to have more heating length, improve the preheating effect of the conduit, and improve the effect and stability of conduit diameter change.

[0058] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A medical catheter diameter reducing and stretching machine, characterized in that: Includes a base (3), on which a clamping device for clamping a guide tube is provided, a sliding seat (2) is slidably connected to the base (3), a first driving member for driving the sliding seat (2) to slide is provided on the base (3), a heating plate (7) is provided on the sliding seat (2), a plurality of heating plates for heating the heating plate (7) are provided on the heating plate (7), a plurality of variable diameter holes (71) are opened on the heating plate (7), a guide seat (9) is provided on the sliding seat (2), a plurality of guide grooves (10) are opened on the guide seat (9), the plurality of guide grooves (10) are arranged one-to-one with the plurality of variable diameter holes (71), and a locking plate (11) for closing the guide grooves (10) is rotatably connected to the guide seat (9); A limiting slide cavity is provided on the base (3), and the limiting slide cavity is provided along the sliding direction of the sliding seat (2). Multiple rows of limiting slide plates (14) are slidably connected in the limiting slide cavity. A connecting rod is provided between the limiting slide plate (14) near the heating plate (7) and the heating plate (7). Limiting baffles (30) are provided on both sides of the limiting slide plate (14). The height of the multiple limiting baffles (30) gradually increases along the direction close to the sliding seat (2). Multiple sets of limiting blocks (29) are provided on the limiting slide cavity. The height of each set of limiting blocks (29) gradually increases along the direction away from the clamping device. The height of the limit plate (30) is set to correspond to the height of the limit plate (30). The limit plate (14) is provided with a mounting hole (17). The mounting hole (17) is opened through multiple sets of the limit plate (14). The mounting hole (17) is opened coaxially with the variable diameter hole (71). Multiple abutment pieces (16) are hinged to the inner wall of the mounting hole (17). The abutment pieces (16) are inclined downward in the direction away from the guide seat (9). The multiple abutment pieces (16) form a locking cavity for holding the guide tube. The inner wall of the mounting hole (17) is provided with a fixing spring (15) for driving the abutment pieces (16) to press against the inner wall of the guide tube. A cooling column (20) is installed on the limiting slide plate (14) near the heating plate (7). The cooling column (20) is inserted into the mounting hole (17). The cooling column (20) is coaxial with the mounting hole (17). A cooling cavity (21) for a conduit to pass through is opened through the axis of the cooling column (20). A circulation cavity (22) is opened inside the cooling column (20). An inlet hole (19) and a drain hole (23) communicating with the cooling cavity (21) are opened on the cooling column (20). The outer diameter of the cooling column (20) gradually decreases in the direction away from the heating plate (7).

2. The medical catheter diameter reducing and stretching machine according to claim 1, characterized in that: A male magnetic block (25) and a female magnetic block (26) are respectively provided on two adjacent limiting slide plates (14), and the male magnetic block (25) and the female magnetic block (26) attract each other.

3. A medical catheter diameter reducing and stretching machine according to claim 2, characterized in that: A laser measuring instrument is provided on the heating plate (7), which includes multiple laser emitters (12) provided on the heating plate (7), and a laser displacement sensor (13) for detecting laser offset is provided at the bottom of the heating plate (7).

4. A medical catheter diameter reducing and stretching machine according to claim 3, characterized in that: The heating plate (7) consists of a heating base (72) fixed on the slide and a tension seat (73) rotatably connected to the heating base (72). The tension seat (73) is hinged to the guide seat (9). The two ends of the connecting rod are rotatably connected to the tension seat (73) and the limiting slide plate (14) respectively.

5. A medical catheter diameter reducing and stretching machine according to claim 2, characterized in that: The bottom of the limiting slide cavity is provided with multiple sets of limiting slides (28), and the limiting block (29) is slidably connected to the limiting slide (28). A retaining spring (27) is provided on the side of the limiting slide (28) away from the clamping device. The retaining spring (27) is used to push the limiting slide (14) away from the heating plate (7).

6. A medical catheter diameter reducing and stretching machine according to claim 5, characterized in that: A heating assembly is fitted inside the guide groove (10). The heating assembly is composed of several U-shaped sleeves (31) that are interlocked with each other. A heating cavity (39) for placing a conduit is opened at the upper end of the U-shaped sleeve (31). Adjacent U-shaped sleeves (31) are interlocked with the heating cavity (39). An auxiliary heating strip (36) is provided inside the U-shaped sleeve (31). A sliding groove (38) is opened at the bottom of the U-shaped sleeve (31). The sliding groove (38) is opened along the length direction of the U-shaped sleeve (31). A positioning plug (32) is slidably connected inside the sliding groove (38). An auxiliary compression spring (37) for pushing the positioning plug (32) closer to the heating plate (7) is provided inside the sliding groove (38). A positioning insertion hole (35) for interlocking with the positioning plug (32) is opened inside the heating cavity (39).

7. A medical catheter diameter reducing and stretching machine according to claim 6, characterized in that: The U-shaped sleeve (31) has an involute slope (311) at one end away from the heating plate (7), and the involute slope (311) is opened outward in a direction away from the U-shaped sleeve (31).

8. A medical catheter diameter reducing and stretching machine according to claim 7, characterized in that: The bottom of the positioning insert (32) is provided with a first magnetic block (33), and the bottom of the sliding groove (38) is provided with a second magnetic block (34) that attracts the first magnetic block (33).

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