Interventional micro-catheter and machining jig of interventional micro-catheter

Abstract

The invention belongs to the technical field of medical catheters, and particularly relates to an interventional microcatheter and a machining jig of the interventional microcatheter. The interventional microcatheter comprises a microcatheter body, a developing ring is fixedly embedded in the inner wall of a far-end catheter opening of the microcatheter body, and a groove is formed in the outer wall of the connecting end of the developing ring; the inner wall of a far-end pipe opening of the micro-catheter body is fixedly connected with a limiting clamping ring matched with a groove in the outer wall of the connecting end of the developing ring. The interventional micro-catheter machining jig has the functions of precise forming, high-speed cooling and integrated polishing, it is ensured that the joint is tightly attached, the air hole defect does not exist, the use reliability and product safety of the machining jig are remarkably improved, meanwhile, the machining qualification rate of interventional micro-catheters is increased, and the production cost is reduced. The processing efficiency and the operation convenience of the far end of the interventional micro catheter and the developing ring are improved, and the extra labor intensity of workers is greatly reduced.

Description

Technical Field

[0001] This invention belongs to the field of medical catheter technology, and in particular relates to an interventional microcatheter and a processing fixture for the interventional microcatheter. Background Technology

[0002] Interventional microcatheters and their processing fixtures are specialized tooling fixtures used throughout the entire process of interventional microcatheters made of medical polymer materials such as polyurethane and polytetrafluoroethylene, including extrusion molding, shaping, cutting, end treatment, and component assembly. Their core function is to ensure the dimensional accuracy, structural stability, and medical cleanliness requirements of the microcatheters. They are key supporting equipment for achieving large-scale, standardized production of interventional microcatheters. A typical example is the specialized fixture used to install the radiopaque ring at the distal end of the interventional microcatheter. This fixture uses a precise temperature control module to heat the distal end of the interventional microcatheter, softening the tube wall material. A coaxial positioning mandrel ensures precise alignment of the radiopaque ring with the axis of the interventional microcatheter. Combined with uniform radial pressure, the softened catheter wall tightly wraps around the radiopaque ring, ultimately achieving thermal fusion embedding and fixation. This enables precise positioning under X-ray during clinical interventional surgery, effectively avoiding the risk of vascular tissue damage caused by radiopaque deviation or rough connection points.

[0003] Currently, the fixtures connecting the distal end of the interventional microcatheter to the imaging ring are often fixed by hot-melt extrusion. However, during this process, the area where the distal end of the interventional microcatheter fits the gap of the extrusion module is prone to residual fine burrs and overflow due to material overflow during hot melting and insufficient precision of the module gap. Although these burrs are small, since the interventional microcatheter is an implantable medical device, it needs to be manually trimmed with polishing tools. This not only reduces the processing efficiency and ease of operation of the distal end of the interventional microcatheter and the imaging ring, but also significantly increases the extra labor intensity of the staff.

[0004] Furthermore, if the extrusion pressure is applied unevenly or the pressure holding time is inappropriate during the extrusion process, air may remain on the mating surface of the interventional microcatheter and the imaging ring, forming tiny pores. This not only leads to a significant decrease in the firmness of the connection between the two, but also damages the structural uniformity of the connection. This reduces the pass rate of imaging ring installation and processing, and may also cause stress concentration due to pores, increasing the risk of breakage of the microcatheter during clinical use, seriously affecting the reliability of interventional microcatheter processing fixtures and product safety.

[0005] To address these issues, we propose an interventional microcatheter and a fabrication fixture for the interventional microcatheter. Summary of the Invention

[0006] The purpose of this invention is to address the above-mentioned problems by providing an interventional microcatheter and a fixture for processing the interventional microcatheter.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: an interventional microcatheter, comprising a microcatheter body, wherein a contrast ring is fixedly embedded in the inner wall of the distal end of the microcatheter body, a groove is formed on the outer wall of the connecting end of the contrast ring, and a limiting retaining ring is fixedly connected to the inner wall of the distal end of the microcatheter body, which cooperates with the groove on the outer wall of the connecting end of the contrast ring.

[0008] A processing fixture for an interventional microcatheter, which is applied to the aforementioned interventional microcatheter, includes a hollow box. The outer wall of the hollow box has a through circular hole, and an electric push rod is fixedly connected to the wall of the through circular hole. The moving end of the electric push rod is fixedly sleeved with a connecting bearing, and a square cylinder is fixedly sleeved on the outer wall of the connecting bearing.

[0009] The hollow box has a rectangular hole that mates with the square tube on the outer wall of the side away from the electric push rod, and the wall of the rectangular hole is slidably connected to the outer wall of the square tube.

[0010] The front and rear side walls of the square tube are provided with rectangular sliding through holes, and the walls of the two rectangular sliding through holes are slidably connected to a support rod. The side end of the support rod is fixedly connected to the inner wall of the hollow box.

[0011] A heating mechanism is fixedly connected to the wall of the support rod;

[0012] The outer wall of the square tube has a circular hole, and a sealing bearing is fixedly connected to the wall of the circular hole. A spinning forming mechanism is fixedly connected to the inner wall of the sealing bearing.

[0013] The inner wall of the square tube is fixedly connected to a drive mechanism that cooperates with the spinning forming mechanism.

[0014] In the aforementioned processing fixture for an interventional microcatheter, the heating mechanism includes a heat insulation cylinder fixedly connected to the outer wall of a support rod, a heat insulation ring fixedly connected to the inner wall of the heat insulation cylinder, an electric heating tube fixedly connected to the heat insulation ring and the inner wall of the heat insulation cylinder, and a heating metal sleeve fixedly fitted to the outer wall of the electric heating tube.

[0015] In the aforementioned processing fixture for interventional microcatheters, the spinning forming mechanism includes an annular convex cover fixedly connected to the inner wall of a sealing bearing. An internal toothed ring is fixedly connected to one side of the annular convex cover located inside a square cylinder. An annular communicating cavity is formed inside the annular convex cover. Multiple air inlet holes are formed in the cavity wall of the annular communicating cavity. A spinning ring is fixedly embedded in the outer wall of the annular convex cover. A cooling groove is formed in the inner wall of the spinning ring. Two symmetrically distributed polishing mechanisms are fixedly connected to the groove wall of the cooling groove.

[0016] In the aforementioned processing fixture for interventional microcatheters, the polishing mechanism includes a hollow cylinder fixedly connected to the wall of a cooling groove. A rubber ring is slidably and sealingly connected to the inner wall of the hollow cylinder. A connecting rod is fixedly connected to the inner wall of the rubber ring. The connecting end of the connecting rod passes through the outer wall of the hollow cylinder. A fixing shell is fixedly connected to the connecting end of the connecting rod by bolts. A fine polishing block is fixedly connected to the inner wall of the fixing shell. A gas guide tube is fixedly embedded in the wall of the cooling groove located at the hollow cylinder. The air inlet end of the gas guide tube passes through the outer wall of the spinning ring and extends into the interior of the annular communicating cavity.

[0017] In the aforementioned processing fixture for an interventional microcatheter, the driving mechanism includes a fixing ring fixedly connected to the inner wall of a square cylinder. A micro motor is fixedly connected to the outer wall of the fixing ring. The driving end of the micro motor passes through the fixing ring and is fixedly connected to a rotating rod via a connector. A mounting bearing is fixedly sleeved on the rod wall. A rectangular plate is fixedly sleeved on the outer wall of the mounting bearing. The outer wall of the rectangular plate is fixedly connected to the inner wall of the square cylinder. An inner hole with the same outer diameter as the distal end of the interventional microcatheter is opened on the outer wall at the center of the rectangular plate. A driving gear that mates with an internal gear ring is fixedly connected to the end of the rotating rod away from the micro motor. A micro air pump is fixedly connected to the outer wall of the rectangular plate, and the output end of the micro air pump passes through the rectangular plate.

[0018] In the above-mentioned processing fixture for interventional microcatheters, a rectangular air inlet hole is provided on the lower surface of the square tube, and a protective filter plate is fixedly connected to the wall of the rectangular air inlet hole.

[0019] In the above-mentioned processing fixture for interventional microcatheters, the center positions of the spinning ring, the rectangular plate, and the heating metal sleeve are on the same horizontal straight line, and the inner diameters of the spinning ring and the rectangular plate are the same.

[0020] In the above-mentioned processing fixture for interventional microcatheters, a fixture fixing seat is fixedly connected to the lower surface of the hollow box, and fixing through holes are provided at the four corners of the upper surface of the fixture fixing seat.

[0021] Compared with existing technologies, the advantages of this invention are:

[0022] 1. Using an electric push rod, heating mechanism, and spinning forming mechanism, when the developing ring needs to be connected to the distal end of the microcatheter body, a processing fixture precisely matching the outer diameter of the distal end of the microcatheter body and the size of the developing ring is first selected. Then, the metal developing ring is placed on the heated metal sleeve, with the side end of the heated metal sleeve extending a certain distance into the inner side of the distal end of the microcatheter body. Next, the operator controls the heating mechanism via an external control panel to soften the distal end of the microcatheter body. Then, the operator precisely inserts the softened distal end of the microcatheter body into the connecting end of the developing ring. Afterwards, the moving end of the electric push rod is controlled to retract at a uniform speed via the external control panel. The spinning ring is rotated by activating the drive mechanism. Then, the rotating and uniformly moving spinning ring applies a uniform pressure to the softened distal end wall of the microcatheter body. Radial spin pressure ensures that the distal wall of the softened microcatheter body fits evenly against the outer wall of the imaging ring, effectively expelling air between the mating surfaces. Simultaneously, because the inner diameter of the spin ring matches the designed outer diameter of the distal end of the microcatheter body, the retracting and rotating spin ring synchronously corrects the shape of the distal end of the microcatheter body fitted onto the imaging ring. This allows protruding material from the distal wall of the microcatheter body to flow to the connection gap between the imaging ring and the microcatheter body, while excess softened material is flattened and separated by the end face of the spin ring. This ensures that the softened distal end of the microcatheter body completely and tightly wraps the connection area of ​​the imaging ring. This structure enables the processing fixture to have precise forming capabilities, ensuring a tight fit and eliminating air pockets at the connection point. This significantly improves the reliability of the processing fixture and product safety, while also increasing the processing yield of interventional microcatheters.

[0023] 2. Using a miniature air pump and a rectangular plate, the miniature air pump, upon startup, draws in outside air through the rectangular air inlet on the lower surface of the rectangular cylinder. The air is purified by passing through a protective filter plate to remove dust and impurities. The purified air is then delivered to the air inlet through the output of the miniature air pump and enters the annular connecting cavity inside the annular convex cover. This annular connecting cavity acts as a pressure-stabilizing buffer, stabilizing pressure fluctuations from the miniature air pump. The clean air within the annular connecting cavity is divided into two paths: one path is introduced into the hollow cylinder through the corresponding air guide pipe for each polishing mechanism, maintaining a stable working pressure for the polishing mechanism; the other path is directly injected into the cooling slot. The clean air injected into the cooling slot is throttled and accelerated through the annular gap between the inner hole of the spinning ring and the outer wall of the micro-conduit body, forming... The high-speed airflow is ultimately discharged to the outside atmosphere through the fit gap between the inner hole of the rectangular plate and the microcatheter body, and the fit gap between the rectangular sliding through hole on the square cylinder and the support rod. Since the electric heating tube has stopped heating, the high-speed airflow can quickly remove the heat from the distal end of the microcatheter body, achieving high-speed cooling and shaping of the catheter wall. At the same time, the high-speed clean air continuously discharged outward along the surface of the microcatheter body can clean the distal surface of the microcatheter body, blowing away the trace residual impurities generated during processing and discharging them to the outside of the fixture, avoiding secondary pollution caused by impurity adhesion, and meeting the cleanliness requirements of medical device processing. This structure enables the processing fixture to have a high-speed cooling function, effectively shortening the molding cycle and improving the efficiency of connecting the distal end of the microcatheter body to the imaging ring.

[0024] 3. Through the polishing mechanism, air enters the hollow cylinder through the air duct. The air pressure drives the fixed shell and fine polishing block to extend inward through the rubber ring and connecting rod, ensuring that the fine polishing block fits tightly against the distal surface of the microcatheter body. This ensures uniform and stable polishing pressure. When the rotating pressure ring is moved by the retracting square cylinder, the fine polishing block rotates synchronously with the pressure ring, performing 360° rotational polishing along the distal surface of the microcatheter body with uniform speed and pressure. This eliminates the need for manual polishing with precision equipment, saving time and effort. The fine polishing block can perform comprehensive and uniform polishing on the connection area of ​​the distal end of the microcatheter body after cooling and shaping, effectively improving the surface smoothness of the connection and avoiding the risk of vascular tissue damage during clinical use due to surface roughness. This structure enables the processing fixture to have an integrated polishing function, significantly improving the processing quality of the connection between the distal end of the microcatheter body and the imaging ring. It also improves the processing efficiency and ease of operation of the distal end of the microcatheter body and the imaging ring, greatly reducing the extra labor intensity of the staff. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of an interventional microcatheter provided by the present invention;

[0026] Figure 2This is a schematic diagram of the structure of a processing fixture for interventional microcatheters provided by the present invention;

[0027] Figure 3 This is a front view structural schematic diagram of a processing fixture for interventional microcatheters provided by the present invention;

[0028] Figure 4 yes Figure 3 A schematic diagram of the structure in partial cross-section;

[0029] Figure 5 yes Figure 4 A partially enlarged structural diagram;

[0030] Figure 6 This is a schematic diagram of the spinning forming mechanism in a processing fixture for interventional microcatheters provided by the present invention;

[0031] Figure 7 This is a schematic diagram of the polishing mechanism in a processing fixture for interventional microcatheters provided by the present invention.

[0032] In the diagram: 1. Microcatheter body, 2. Imaging ring, 3. Limiting ring, 4. Square cylinder, 5. Support rod, 6. Heating mechanism, 61. Heat insulation cylinder, 62. Heat insulation ring, 63. Electric heating tube, 64. Heating metal sleeve, 7. Spin forming mechanism, 71. Annular convex cover, 72. Internal toothed ring, 73. Annular connecting cavity, 74. Air inlet hole, 75. Spin ring, 76. Cooling groove, 8. Polishing mechanism, 81. Hollow cylinder, 82. Rubber ring, 83. Connecting rod, 84. Fixing shell, 85. Fine polishing block, 86. Air guide tube, 9. Drive mechanism, 91. Fixing ring, 92. Micro motor, 93. Rotating rod, 94. Mounting bearing, 95. Rectangular plate, 96. Drive gear, 97. Micro air pump, 10. Rectangular sliding through hole, 11. Sealed bearing, 12. Protective filter plate, 13. Fixture fixing seat, 14. Hollow box, 15. Electric push rod, 16. Connecting bearing. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] like Figure 1 As shown, an interventional microcatheter includes a microcatheter body 1. A radiopaque ring 2 is fixedly embedded in the inner wall of the distal end of the microcatheter body 1. A groove is formed on the outer wall of the connecting end of the radiopaque ring 2. A limiting ring 3 is fixedly connected to the inner wall of the distal end of the microcatheter body 1, which cooperates with the groove on the outer wall of the connecting end of the radiopaque ring 2. The limiting ring 3 and the groove can improve the firmness of the connection.

[0035] like Figures 2-7 As shown, a processing fixture for an interventional microcatheter, applied to the aforementioned interventional microcatheter, includes a hollow box 14. A through circular hole is formed on the outer wall of the hollow box 14, and an electric push rod 15 is fixedly connected to the wall of the through circular hole. A connecting bearing 16 is fixedly sleeved on the moving end of the electric push rod 15. A square cylinder 4 is fixedly sleeved on the outer wall of the connecting bearing 16. A rectangular hole that mates with the square cylinder 4 is formed on the outer wall of the hollow box 14 away from the electric push rod 15, and the wall of the rectangular hole is slidably connected to the outer wall of the square cylinder 4. Rectangular sliding through holes 10 are formed on both the front and rear side walls of the square cylinder 4, and a support rod 5 is slidably connected to the walls of the two rectangular sliding through holes 10. The side end of the support rod 5 is fixedly connected to the inner wall of the hollow box 14.

[0036] A heating mechanism 6 is fixedly connected to the wall of the support rod 5. The heating mechanism 6 includes a heat insulation cylinder 61 fixedly connected to the outer wall of the support rod 5. A heat insulation ring 62 is fixedly connected to the inner wall of the heat insulation cylinder 61. An electric heating tube 63 is fixedly connected to both the heat insulation ring 62 and the inner wall of the heat insulation cylinder 61. A heating metal sleeve 64 is fixedly sleeved on the outer wall of the electric heating tube 63.

[0037] The outer wall of the square cylinder 4 has a circular hole, and a sealing bearing 11 is fixedly connected to the wall of the circular hole. A spinning forming mechanism 7 is fixedly connected to the inner wall of the sealing bearing 11. The spinning forming mechanism 7 includes an annular convex cover 71 fixedly connected to the inner wall of the sealing bearing 11. An internal toothed ring 72 is fixedly connected to one side of the annular convex cover 71 inside the square cylinder 4. An annular communicating cavity 73 is opened inside the annular convex cover 71. Multiple air inlet holes 74 are opened in the cavity wall of the annular communicating cavity 73. A spinning ring 75 is fixedly embedded in the outer wall of the annular convex cover 71. A cooling groove 76 is opened in the inner wall of the spinning ring 75.

[0038] The cooling groove 76 has two symmetrically distributed polishing mechanisms 8 fixedly connected to its groove wall. The polishing mechanism 8 includes a hollow cylinder 81 fixedly connected to the groove wall of the cooling groove 76. A rubber ring 82 is slidably sealed to the inner wall of the hollow cylinder 81. A connecting rod 83 is fixedly connected to the inner wall of the rubber ring 82. The connecting end of the connecting rod 83 passes through the outer wall of the hollow cylinder 81. The connecting end of the connecting rod 83 is fixedly connected to a fixing shell 84 by bolts. A fine polishing block 85 is fixedly connected to the inner wall of the fixing shell 84. A gas guide pipe 86 is fixedly embedded in the groove wall of the cooling groove 76 at the location of the hollow cylinder 81. The air inlet end of the gas guide pipe 86 passes through the outer wall of the spinning ring 75 and extends into the interior of the annular communicating cavity 73.

[0039] A drive mechanism 9, which cooperates with the spinning forming mechanism 7, is fixedly connected to the inner wall of the square cylinder 4. The drive mechanism 9 includes a fixing ring 91 fixedly connected to the inner wall of the square cylinder 4. A micro motor 92 is fixedly connected to the outer wall of the fixing ring 91. The drive end of the micro motor 92 passes through the fixing ring 91 and is fixedly connected to a rotating rod 93 through a connector. A mounting bearing 94 is fixedly sleeved on the rod wall of the rotating rod 93. A rectangular plate 95 is fixedly sleeved on the outer wall of the mounting bearing 94. The outer wall of the rectangular plate 95 is fixedly connected to the inner wall of the square cylinder 4. An inner hole with the same outer diameter as the distal end of the microcatheter body 1 is opened on the outer wall of the center of the rectangular plate 95. A drive gear 96 that cooperates with the internal gear ring 72 is fixedly connected to the end of the rotating rod 93 away from the micro motor 92. A micro air pump 97 is fixedly connected to the outer wall of the rectangular plate 95. The output end of the micro air pump 97 passes through the rectangular plate 95. The center positions of the spinning ring 75, the rectangular plate 95 and the heating metal sleeve 64 are on the same horizontal straight line. The inner diameters of the spinning ring 75 and the rectangular plate 95 are the same.

[0040] A rectangular air inlet is provided on the lower surface of the square cylinder 4, and a protective filter plate 12 is fixedly connected to the wall of the rectangular air inlet. A fixture fixing seat 13 is fixedly connected to the lower surface of the hollow box 14, and a fixing through hole is provided at each of the four corners of the upper surface of the fixture fixing seat 13.

[0041] The electric push rod 15, electric heating tube 63, micro motor 92 and micro air pump 97 are all electrically connected to an external power supply via an external control panel. The above-mentioned electrical components and connections are all existing technologies and will not be described in detail here.

[0042] The operating principle of this invention is described as follows: When the developing ring 2 needs to be connected and formed to the distal end of the microcatheter body 1, a processing fixture that precisely matches the outer diameter of the distal end of the microcatheter body 1 and the size of the developing ring 2 is first selected. The fixture is then fastened to the worktable through the fixing through hole on the fixture fixing seat 13 to ensure stability during processing. Then, the metal developing ring 2 is placed on the heating metal sleeve 64. The limiting and blocking effect of the side end of the heat insulation cylinder 61 can accurately position the placed developing ring 2, preventing the developing ring 2 from shifting and ensuring the processing accuracy of the connection and forming between the developing ring 2 and the distal end of the microcatheter body 1. At the same time, the distal end of the microcatheter body 1 is precisely passed through the spinning ring 75. After the inner hole is filled, it abuts against the side end of the heating metal sleeve 64. The side end of the heating metal sleeve 64 needs to extend into the inner side of the distal end of the microcatheter body 1 by a certain distance (e.g., 2-3 mm, the extension length can be adjusted according to the outer dimensions of the developing ring 2) to provide structural support for the reliable connection between the developing ring 2 and the distal end of the microcatheter body 1. Then, the operator controls the electric heating tube 63 to work for a period of time (e.g., 3-5 seconds) through the external control panel. Since the wall thickness and outer diameter of the distal end of the microcatheter body 1 are extremely small, and the core objective of heating is only to soften the wall of the microcatheter body 1 (without completely melting), there is no need for excessive heating time to avoid excessive softening of the material and structural deformation.

[0043] After a period of time, the electric heating tube 63 is de-energized and stops heating to prevent the distal end of the microcatheter body 1 from melting and being damaged due to excessive temperature. Then, the staff precisely inserts the softened distal end of the microcatheter body 1 into the connecting end of the developing ring 2 along the guide of the heated metal sleeve 64. At this time, the distal end of the softened microcatheter body 1 inserted into the connecting end of the developing ring 2 will bulge to form a limiting ring 3. Then, the moving end of the electric push rod 15 is controlled to retract at a uniform speed through the external control panel. The electric push rod 15 retracts into the spinning stage. At this time, the micro air pump 97 is not started. After the spinning is completed and the electric push rod 15 is fully retracted, the micro air pump 97 is started again to first complete the cooling and shaping, and then the polishing mechanism 8 is extended by air pressure to perform 360° rotation polishing.

[0044] When the moving end of the electric push rod 15 retracts, it drives the square cylinder 4 to smoothly retract into the hollow box 14 along the sliding fit direction between the support rod 5 and the rectangular sliding through hole 10 through the connecting bearing 16; the square cylinder 4 simultaneously drives the spinning forming mechanism 7, the driving mechanism 9 and the polishing mechanism 8 to move at a constant speed along the outer wall of the distal end of the microcatheter body 1 towards the imaging ring 2.

[0045] After the micro motor 92 starts, it drives the rotating rod 93 to rotate stably around the mounting bearing 94 via the connector. The drive gear 96 at the end of the rotating rod 93 meshes with the internal gear ring 72 on the inner side of the annular convex cover 71, thereby driving the annular convex cover 71 to rotate through the sealed bearing 11, and finally driving the spinning ring 75 to rotate synchronously. When the spinning ring 75 retracts towards the imaging ring 2 under the drive of the square cylinder 4, it applies a uniform radial spinning force to the distal wall of the softened microcatheter body 1, so that the distal wall of the softened microcatheter body 1 is evenly attached to the outer wall of the imaging ring 2, effectively expelling the air between the contact surfaces and avoiding the formation of micropores. At the same time, since the inner diameter of the spinning ring 75 is consistent with the designed outer diameter of the distal end of the microcatheter body 1, the retraction spinning... The rotating spin ring 75 can simultaneously correct the distal shape of the microcatheter body 1 fitted on the imaging ring 2, allowing the material protruding from the distal wall of the microcatheter body 1 to flow to the connection gap between the imaging ring 2 and the microcatheter body 1. Excess softened material is flattened and separated by the end face of the spin ring 75, ensuring that the softened distal end of the microcatheter body 1 can completely and tightly wrap the connection part of the imaging ring 2. When the moving end of the electric push rod 15 is fully retracted, the polishing mechanism 8 moves precisely to the surface of the metal material of the imaging ring 2. This structure enables the processing fixture to have a precise forming function, ensuring that the connection is tight and free of pore defects, significantly improving the reliability of the processing fixture and the safety of the product, while also increasing the processing qualification rate of interventional microcatheters.

[0046] After the micro air pump 97 is started, it draws in outside air through the rectangular air inlet on the lower surface of the square cylinder 4. The air is purified by filtering out dust and impurities through the protective filter plate 12. Since the inner diameter of the rectangular plate 95 is the same as the outer diameter of the distal end of the micro-conduit body 1, the clean air will not overflow in large quantities at the connection between the rectangular plate 95 and the distal end of the micro-conduit body 1. The purified air is delivered to the air inlet 74 through the output end of the micro air pump 97, and enters the annular connecting cavity 73 inside the annular convex cover 71 through the air inlet 74. The annular connecting cavity 73 serves as a pressure stabilizing buffer. The cavity can stabilize the pressure fluctuations output by the micro air pump 97. The clean air in the annular cavity 73 is divided into two paths. One path is introduced into the hollow cylinder 81 through the air guide pipe 86 corresponding to each polishing mechanism 8 to maintain the stable working pressure of the polishing mechanism 8. The stable pressure inside the hollow cylinder 81 is achieved by the dynamic balance formed by the continuous air flow of the micro air pump 97 and the slight leakage flow between the rubber ring 82 and the inner wall of the hollow cylinder 81. The other part is directly injected into the cooling slot 76. The airflow of the cooling slot 76 is discharged unidirectionally to the side away from the heating mechanism 6.

[0047] Clean air injected into the cooling slot 76 is throttled and accelerated through the annular gap between the inner hole of the spinning ring 75 and the outer wall of the microcatheter body 1, forming a high-speed airflow. Finally, it is continuously discharged to the outside atmosphere through the fitting gap between the inner hole of the rectangular plate 95 and the microcatheter body 1, and the fitting gap between the rectangular sliding through hole 10 on the square cylinder 4 and the support rod 5, forming a complete and continuous high-speed airflow field. Since the electric heating tube 63 has stopped heating, the high-speed airflow can quickly remove the heat from the distal end of the microcatheter body 1, realizing high-speed cooling and shaping of the wall of the microcatheter body 1. At the same time, the high-speed clean air continuously discharged outward along the surface of the catheter can clean the distal surface of the microcatheter body 1, blowing away the trace residual impurities generated during processing from the surface of the microcatheter body 1 and discharging them to the outside of the fixture, avoiding secondary pollution caused by impurity adhesion, and meeting the cleanliness requirements of medical device processing. This structure enables the processing fixture to have a high-speed cooling function, effectively shortening the molding cycle and improving the efficiency of connecting the distal end of the microcatheter body 1 with the imaging ring 2.

[0048] After air enters the hollow cylinder 81 through the air guide tube 86, the air pressure will push the rubber ring 82 to slide smoothly along the inner wall of the hollow cylinder 81. Then, through the connecting rod 83, the fixed shell 84 and the fine polishing block 85 will be driven to extend inward, so that the fine polishing block 85 is tightly attached to the distal surface of the microcatheter body 1, ensuring that the polishing pressure is uniform and stable. When the rotating spin ring 75 is moved by the retracted square cylinder 4, the fine polishing block 85 will rotate synchronously with the spin ring 75, and perform 360° rotational polishing along the distal surface of the microcatheter body 1 with uniform speed and pressure.

[0049] During the spinning process of the spinning ring 75, the material flows uniformly, so the softened distal end of the microcatheter body 1 will not produce burrs or overflow defects. Therefore, the rotating fine polishing block 85 only needs to perform fine polishing and correction on the surface of the connection between the distal end of the microcatheter body 1 and the imaging ring 2. There is no need for long-term grinding, nor is it necessary for staff to use precision equipment for manual grinding and polishing, saving time and effort. The fine polishing block 85 can perform comprehensive and uniform polishing treatment on the connection area after the distal end of the microcatheter body 1 has cooled and shaped, effectively improving the surface smoothness of the connection of the microcatheter body 1 and avoiding the risk of vascular tissue damage during clinical use due to surface roughness. This structure enables the processing fixture to have an integrated polishing function, which significantly improves the processing quality of the connection between the distal end of the microcatheter body 1 and the imaging ring 2, while improving the processing efficiency and operation convenience of the distal end of the microcatheter body 1 and the imaging ring 2, and greatly reducing the extra labor intensity of the staff.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An interventional microcatheter, comprising a microcatheter body (1), characterized in that, The distal end of the microcatheter body (1) is fixedly embedded with a radiopaque ring (2), and the outer wall of the connecting end of the radiopaque ring (2) is provided with a groove. The distal end of the microcatheter body (1) is fixedly connected with a limiting ring (3) that cooperates with the groove on the outer wall of the connecting end of the radiopaque ring (2).

2. A processing fixture for an interventional microcatheter, applied to an interventional microcatheter as described in claim 1, comprising a hollow box (14), characterized in that, The hollow box (14) has a through circular hole on its outer wall, and an electric push rod (15) is fixedly connected to the wall of the through circular hole. The moving end of the electric push rod (15) is fixedly sleeved with a connecting bearing (16), and a square cylinder (4) is fixedly sleeved on the outer wall of the connecting bearing (16). The hollow box (14) has a rectangular hole that fits into the square tube (4) through the outer wall on the side away from the electric push rod (15), and the wall of the rectangular hole is slidably connected to the outer wall of the square tube (4). The front and rear side walls of the square tube (4) are provided with rectangular sliding through holes (10), and the walls of the two rectangular sliding through holes (10) are slidably connected to a support rod (5). The side end of the support rod (5) is fixedly connected to the inner wall of the hollow box (14). The support rod (5) has a heating mechanism (6) fixedly connected to its wall. The outer wall of the square tube (4) is provided with a circular hole, and a sealing bearing (11) is fixedly connected to the wall of the circular hole. A spinning forming mechanism (7) is fixedly connected to the inner wall of the sealing bearing (11). The inner wall of the square tube (4) is fixedly connected to a drive mechanism (9) that cooperates with the spinning forming mechanism (7). The spinning forming mechanism (7) includes an annular convex cover (71) fixedly connected to the inner wall of the sealed bearing (11). An internal toothed ring (72) is fixedly connected to one side of the annular convex cover (71) inside the square cylinder (4). An annular communicating cavity (73) is opened inside the annular convex cover (71). Multiple air inlet holes (74) are opened on the cavity wall of the annular communicating cavity (73). A spinning ring (75) is fixedly embedded on the outer wall of the annular convex cover (71). A cooling groove (76) is opened on the inner wall of the spinning ring (75). Two symmetrically distributed polishing mechanisms (8) are fixedly connected to the groove wall of the cooling groove (76). The drive mechanism (9) includes a fixed ring (91) fixedly connected to the inner wall of the square cylinder (4). A micro motor (92) is fixedly connected to the outer wall of the fixed ring (91). The drive end of the micro motor (92) passes through the fixed ring (91) and is fixedly connected to a rotating rod (93) through a connector. A mounting bearing (94) is fixedly sleeved on the rod wall of the rotating rod (93). A rectangular plate (95) is fixedly sleeved on the outer wall of the mounting bearing (94). The outer wall of the rectangular plate (95) is fixedly connected to the inner wall of the square cylinder (4). An inner hole with the same outer diameter as the distal end of the microcatheter body (1) is opened on the outer wall at the center of the rectangular plate (95). A drive gear (96) that cooperates with the internal gear ring (72) is fixedly connected to the end of the rotating rod (93) away from the micro motor (92). A micro air pump (97) is fixedly connected to the outer wall of the rectangular plate (95). The output end of the micro air pump (97) passes through the rectangular plate (95).

3. The processing fixture for an interventional microcatheter according to claim 2, characterized in that, The heating mechanism (6) includes a heat insulation cylinder (61) fixedly connected to the outer wall of the support rod (5), a heat insulation ring (62) fixedly connected to the inner wall of the heat insulation cylinder (61), an electric heating tube (63) fixedly connected to the heat insulation ring (62) and the inner wall of the heat insulation cylinder (61), and a heating metal sleeve (64) fixedly sleeved on the outer wall of the electric heating tube (63).

4. The processing fixture for an interventional microcatheter according to claim 2, characterized in that, The polishing mechanism (8) includes a hollow cylinder (81) fixedly connected to the wall of the cooling groove (76). A rubber ring (82) is slidably sealed to the inner wall of the hollow cylinder (81). A connecting rod (83) is fixedly connected to the inner wall of the rubber ring (82). The connecting end of the connecting rod (83) passes through the outer wall of the hollow cylinder (81). The connecting end of the connecting rod (83) is fixedly connected to a fixed shell (84) by bolts. A fine polishing block (85) is fixedly connected to the inner wall of the fixed shell (84). A gas guide pipe (86) is fixedly embedded in the wall of the cooling groove (76) located at the hollow cylinder (81). The air inlet end of the gas guide pipe (86) passes through the outer wall of the spinning ring (75) and extends into the interior of the annular connecting cavity (73).

5. The processing fixture for an interventional microcatheter according to claim 2, characterized in that, The lower surface of the square cylinder (4) is provided with a rectangular air inlet hole, and a protective filter plate (12) is fixedly connected to the wall of the rectangular air inlet hole.

6. The processing fixture for an interventional microcatheter according to claim 3, characterized in that, The center positions of the spinning ring (75), the rectangular plate (95) and the heating metal sleeve (64) are on the same horizontal straight line, and the inner diameters of the spinning ring (75) and the rectangular plate (95) are the same.

7. The processing fixture for an interventional microcatheter according to claim 2, characterized in that, The lower surface of the hollow box (14) is fixedly connected to a fixture fixing seat (13), and the upper surface of the fixture fixing seat (13) is provided with fixing through holes at the four corners.

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