A composite catheter with porous PET membrane end capping and its end capping method

Abstract

This invention discloses a composite conduit with porous PET film end capping, comprising a conduit body, which includes an inner liner tube, an intermediate braided tube, and a polymer outer tube with heat-shrinkable deformation properties arranged sequentially from the inside out. PET heat-shrinkable tubing is disposed at both ends of the conduit body between the intermediate braided tube and the polymer outer tube. The melting point of the PET heat-shrinkable tubing is higher than that of the polymer outer tube. Several adhesive-perforating holes are formed on the surface of the PET heat-shrinkable tubing. The PET heat-shrinkable tubing is wrapped around the intermediate braided tube using a heat-shrinking process. The polymer outer tube is attached to the outer wall of the PET heat-shrinkable tubing using a heat-shrinking process, and the polymer melt generated by the heating of the polymer outer tube is fused to the intermediate braided tube and / or the inner liner tube through the adhesive-perforating holes. This design provides the advantages of secure conduit end capping, reduced delamination between tube layers, and improved safety during conduit use.

Description

Technical Field

[0001] This invention relates to the field of medical composite catheter technology, and in particular to a composite catheter with porous PET membrane end-capping and the end-capping method thereof. Background Technology

[0002] Medical composite catheters are widely used in various interventional procedures, such as cardiovascular, neurovascular and gastrointestinal surgeries. These catheters are usually composed of a three-layer tubular structure.

[0003] A Chinese patent with publication number CN108042897A discloses a composite conduit comprising an outer polymer tube, a middle tubular braided mesh or spring mesh, and a smooth inner layer; the outer polymer tube is made of nylon, block polyetheramide elastomer, polyurethane, or silicone rubber; the wall thickness of the distal end of the middle braided mesh or spring mesh is less than or equal to the wall thickness of the main body of the braided mesh or spring mesh; the inner layer is made of polytetrafluoroethylene, high-density polyethylene, or a block polyetheramide elastomer containing additives to reduce the coefficient of friction.

[0004] However, the above-mentioned composite structure catheter has the following disadvantages: like existing medical composite catheters on the market, during storage or use, due to oxidation or weak bonding between adjacent layers, the adjacent tube layers are prone to delamination and shedding, resulting in the braided wires at the end of the braided mesh being exposed, which makes catheter intervention difficult, and may even cause skin puncture during intervention, which urgently needs to be improved. Summary of the Invention

[0005] The purpose of this invention is to provide a composite catheter with porous PET film end capping and its end capping method, which has the effects of strong catheter end capping, less delamination between tube layers, and improved safety of catheter use.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a composite conduit with porous PET membrane end capping, comprising a conduit body, wherein the conduit body comprises an inner liner tube, a middle braided tube and a polymer outer tube with heat shrink deformation properties arranged sequentially from the inside to the outside;

[0007] At both ends of the conduit body, PET heat-shrink tubing is provided between the intermediate braided tubing and the polymer outer tube. The melting point of the PET heat-shrink tubing is higher than that of the polymer outer tube. Several adhesive holes are opened on the surface of the PET heat-shrink tubing. The PET heat-shrink tubing is wrapped around the intermediate braided tubing through a heat-shrinking process. The polymer outer tube is attached to the outer wall of the PET heat-shrink tubing through a heat-shrinking process. The polymer melt generated by the heating of the polymer outer tube is fused to the intermediate braided tubing and / or the inner liner through the adhesive holes.

[0008] By employing the above technical solution, the assembled conduit body is heated. The outermost polymer outer tube is heated first and the heat is transferred inward sequentially. Since the melting point of the polymer outer tube is lower than that of the PET heat shrink tubing, the polymer outer tube melts and generates polymer melt. This allows the middle part of the polymer outer tube to absorb heat and fuse with the outer wall of the intermediate braided tubing and the inner liner. Meanwhile, the two ends of the polymer outer tube melt, generating polymer melt that passes through the adhesive passage and fuses with the intermediate braided tubing and the inner liner at both ends of the conduit body. Simultaneously, both the polymer outer tube and the PET heat shrink tubing have heat-shrinking properties. The polymer outer tube and the PET heat shrink tubing absorb heat and shrink inward, causing the PET heat shrink tubing to tightly wrap around the intermediate braided tubing. The polymer outer tube, after absorbing heat, tightly wraps around the intermediate braided tubing and the PET heat shrink tubing. In addition to the T-type heat shrink tubing, this invention utilizes the inward covering force generated by the heat shrinking deformation of the PET heat shrink tubing. This allows the PET heat shrink tubing to firmly cover the inner liner tubing, improving the connection strength and concentricity between the two ends of the inner braided tubing and the inner liner tubing. Simultaneously, multiple glue-passing holes are opened on the surface of the PET heat shrink tubing, allowing the polymer molten material generated by the heating of the outer polymer tubing to pass through the glue-passing holes and fuse with the outer walls of the inner braided tubing and the inner liner tubing inside the PET heat shrink tubing. This further improves the connection strength between the two ends of the outer polymer tubing and the inner braided tubing and the inner liner tubing, thereby improving the end-sealing strength of the catheter body and preventing delamination between adjacent tubing layers. It has the effects of strong catheter end-sealing, less delamination between tubing layers, and improved catheter safety.

[0009] A further provision of the present invention is that the material of the outer polymer tube is PEBAX, and the material of the inner liner tube is PTFE.

[0010] By adopting the above technical solution, the melting point range of PEBAX material is between 120-200℃, while the melting point range of PET material is between 250-260℃. Therefore, as long as the temperature range during heat shrinking is controlled between 120-250℃, it can be ensured that the PET heat shrink tube will not melt when the polymer outer tube begins to melt. At the same time, setting the inner liner tube to PTFE material can make the inner liner tube have sufficient lubricity and biocompatibility.

[0011] A further feature of the present invention is that a plurality of the adhesive holes are equally spaced on the surface of the PET heat shrink tubing.

[0012] By adopting the above technical solution, multiple glue-passing holes are evenly and equidistantly opened on the surface of the PET heat shrink tubing, thereby ensuring a more uniform stress distribution in the radial direction of the tubing body.

[0013] A further feature of the present invention is that the diameter of the glue-passing hole is set between 0.1-0.3 mm, and the hole spacing between adjacent glue-passing holes is set between 1-2 mm.

[0014] By adopting the above technical solution, when the diameter of the glue-passing hole is too large or the hole spacing is too small, the overall structural strength of the PET heat shrink tubing will be reduced. When the diameter of the glue-passing hole is too small or the hole spacing is too large, the polymer melt formed after the polymer outer tube absorbs heat and melts cannot pass through the glue-passing hole smoothly. Therefore, the present invention controls the diameter and hole spacing of the glue-passing hole within a suitable range.

[0015] Another technical objective of this invention is to provide a method for sealing a composite catheter, comprising the following steps:

[0016] S1: Inner liner preparation: Remove oil stains from the outer surface of the inner liner with degreasing alkaline solution to ensure sufficient adhesion on the outer surface of the inner liner;

[0017] S2: Intermediate braided tube forming: The inner lining tube is fixed on a three-dimensional braiding machine, and several fiber filaments are three-dimensionally braided around the outer part of the inner lining tube to form an intermediate braided tube.

[0018] S3: PET heat shrink tubing perforation: Using a perforation device, several glue passage holes are evenly opened on the surface of the PET heat shrink tubing;

[0019] S4: Install PET heat shrink tubing: Install the PET heat shrink tubing obtained in S3 onto both ends of the inner liner tube that wraps the middle braided tube, so that the outer extensions of the corresponding ends of the PET heat shrink tubing and the inner liner tube are aligned.

[0020] S5: Install a polymer outer tube: Install a polymer outer tube over the middle braided tube that is covered with PET heat shrink tubing at both ends, forming a multi-layer wrapping material;

[0021] S6: Heat-melting treatment: The multi-layer wrapping material obtained by S5 is heated using heating equipment, so that the PET heat-shrinkable tube is heat-shrinkably wrapped around the middle braided tube, and the polymer outer tube is heat-shrinkably attached to the outer wall of the PET heat-shrinkable tube. Since the melting point of the PET heat-shrinkable tube is higher than that of the polymer outer tube, the polymer outer tube melts preferentially relative to the PET heat-shrinkable tube. The polymer melt generated by the heating of the polymer outer tube is fused to the middle braided tube and / or the inner lining tube through several glue holes.

[0022] S7: Cooling and curing: The composite conduit obtained by processing S6 is cooled and cured by natural cooling or a cooling device to obtain the final composite conduit product;

[0023] S8: Quality Inspection: Perform visual inspection, mechanical property testing and microstructure analysis on the composite catheter products processed in S7 to ensure that the materials of each layer of the composite catheter product are well bonded and there is no delamination.

[0024] By adopting the above technical solution, the oil stains on the outer surface of the inner liner tube can be quickly removed by alkaline washing with degreasing alkaline solution, improving the anti-slip properties of the fiber filaments of the middle braided tube wrapped around the outer surface of the inner liner tube. At the same time, it is beneficial to the welding force between the polymer outer tube and the inner liner tube. During the sealing process, the outer end of the PET heat shrink tube is kept flush with the outer end of the inner liner tube, thereby preventing the fiber filaments of the middle braided tube from being exposed after sealing, thus improving the safety of the composite conduit. In addition, multiple glue holes are evenly opened on the surface of the PET heat shrink tube, which effectively improves the uniformity of stress distribution in the radial direction of the conduit body. The cooling device can quickly cool and cool the assembled conduit body, allowing it to solidify and obtain the final composite conduit product. Subsequent quality inspection can ensure the yield rate of composite conduits entering the market.

[0025] A further feature of the present invention is that the fiber filament in step S2 is a metal wire with a diameter between 0.05 and 0.2 mm, a fineness controlled between 10 and 200 D, and the braiding density of the intermediate braided tube is set between 10 and 200 PPI.

[0026] A further provision of the present invention is that the drilling equipment in step S3 is a laser drilling machine or a high-precision mechanical drilling machine.

[0027] A further provision of the present invention is that the heating device in step S6 is a hot air gun or a heat shrink machine.

[0028] A further setting of the present invention is that the heating temperature of the heating device in step S6 is controlled between 100-250°C, and the heating time is controlled between 2-5 min.

[0029] A further provision of the present invention is that the cooling device in step S7 is a cooling water tank.

[0030] In summary, the present invention has the following beneficial effects:

[0031] The process involves fitting PET heat-shrink tubing onto both ends of an inner liner tube containing a braided inner tube. A polymer outer tube is then fitted over the braided inner tube, which is then covered with PET heat-shrink tubing. When the assembled conduit body is heated, the outermost polymer outer tube is heated first and transfers heat inwards. Because the melting point of the polymer outer tube is lower than that of the PET heat-shrink tubing, the polymer outer tube melts, producing a polymer melt. This allows the middle of the polymer outer tube to absorb heat and fuse with the outer walls of the braided inner tube and the inner liner tube. Meanwhile, the polymer melts at both ends of the polymer outer tube, producing a polymer melt that passes through the adhesive holes and fuses with the braided inner tube and the inner liner tube at both ends of the conduit body. Simultaneously, both the polymer outer tube and the PET heat-shrink tubing have heat-shrink properties; they absorb heat and shrink inwards, causing the PET heat-shrink tubing to tightly wrap around the braided inner tube. In addition, the polymer outer tube tightly wraps around the middle braided tube and PET heat shrink tubing after absorbing heat. This invention utilizes the inward covering force generated by the heat shrinking deformation of the PET heat shrink tubing, enabling the PET heat shrink tubing to firmly wrap the middle braided tube around the inner liner tube, improving the connection strength and concentricity between the two ends of the middle braided tube and the inner liner tube. At the same time, multiple glue-passing holes are opened on the surface of the PET heat shrink tubing, allowing the polymer melt generated by the heat melting of the polymer outer tube to pass through the glue-passing holes and fuse with the outer wall of the middle braided tube and the inner liner tube inside the PET heat shrink tubing. This further improves the connection strength between the two ends of the polymer outer tube and the middle braided tube and the inner liner tube, thereby improving the end-sealing strength of the catheter body and preventing delamination between adjacent tube layers of the catheter body. It has the effects of strong catheter end-sealing, less delamination between tube layers, and improved catheter safety. Attached Figure Description

[0032] Figure 1 This is a diagram of the internal structure of the present invention, with the outer polymer tube in cross-section.

[0033] Figure 2 This is an overall exploded view of the present invention.

[0034] Figure 3 This is a longitudinal sectional view of the present invention.

[0035] Figure 4 This is the present invention. Figure 3 A magnified view of a portion of region A in the middle.

[0036] In the diagram: 1. Adhesive body; 11. Inner liner; 12. Intermediate braided tubing; 13. PET heat shrink tubing; 131. Adhesive passage; 14. Polymer outer tube. Detailed Implementation

[0037] The invention will now be further described with reference to the accompanying drawings.

[0038] A composite catheter with porous PET membrane end capping, such as Figure 1-4 As shown, the catheter body 1 includes an inner liner 11, an intermediate braided tube 12, and a polymer outer tube 14 with heat-shrinkable deformation properties, arranged sequentially from the inside out. PET heat-shrinkable tubes 13 are provided at both ends of the catheter body 1 between the intermediate braided tube 12 and the polymer outer tube 14. The melting point of the PET heat-shrinkable tube 13 is higher than that of the polymer outer tube 14. Several adhesive-perforating holes 131 are formed on the surface of the PET heat-shrinkable tube 13. The PET heat-shrinkable tube 13 is wrapped around the intermediate braided tube 11 using a heat-shrinking process. 2. In addition, the polymer outer tube 14 is attached to the outer wall of the PET heat-shrink tubing 13 via a heat-shrink process, and the polymer melt generated by the heating of the polymer outer tube 14 is fused to the intermediate braided tube 12 and the inner liner tube 11 through the glue passage 131; the material of the polymer outer tube 14 is PEBAX, and the material of the inner liner tube 11 is PTFE. The melting point range of PEBAX material is between 120-200℃, while the melting point range of PET material is between 250-260℃. Therefore, only the temperature range during heat shrinking needs to be considered. By controlling the temperature between 120-250℃, it is ensured that the PET heat shrink tubing 13 will not melt when the polymer outer tube 14 begins to melt. Simultaneously, using PTFE material for the inner liner tube 11 provides sufficient lubricity and biocompatibility. Several adhesive passages 131 are evenly spaced on the surface of the PET heat shrink tubing 13, ensuring a more uniform stress distribution in the radial direction of the tubing body 1. The aperture of the 131 is set between 0.1-0.3 mm, and the distance between adjacent glue passage holes 131 is set between 1-2 mm. If the aperture of the glue passage hole 131 is too large or the distance between the holes is too small, the overall structural strength of the PET heat shrink tubing 13 will be reduced. If the aperture of the glue passage hole 131 is too small or the distance between the holes is too large, the polymer melt formed after the polymer outer tube 14 absorbs heat and melts cannot pass smoothly through the glue passage hole 131. Therefore, the present invention controls the aperture and distance between the glue passage holes 131 within a suitable range.

[0039] This invention provides a method for sealing a composite catheter, comprising the following steps:

[0040] S1: Preparation of inner liner tube 11: Remove oil stains from the outer surface of the inner liner tube 11 with degreasing alkaline solution to ensure that the outer surface of the inner liner tube 11 has sufficient adhesion.

[0041] S2: Forming of intermediate braided tube 12: Fix the inner liner tube 11 on the three-dimensional braiding machine, and use the three-dimensional braiding machine to braid several fiber filaments in three dimensions around the inner liner tube 11 to form intermediate braided tube 12;

[0042] S3: PET heat shrink tubing 13 perforation: Using a perforation device, several glue passage holes 131 are evenly opened on the surface of the PET heat shrink tubing 13;

[0043] S4: Install PET heat shrink tubing 13: Install the PET heat shrink tubing 13 obtained in S3 onto both ends of the inner liner tube 11 which is wrapped with the intermediate braided tube 12, so that the outer extensions of the corresponding ends of the PET heat shrink tubing 13 and the inner liner tube 11 are aligned.

[0044] S5: Install polymer outer tube 14: Install polymer outer tube 14 over the middle braided tube 12 which is covered with PET heat shrink tubing 13 at both ends, and form a multi-layer wrapping material;

[0045] S6: Heat-melting treatment: The multi-layer wrapping material obtained in S5 is heated using a heating device, so that the PET heat-shrinkable tube 13 is heat-shrinkably wrapped around the middle braided tube 12, and the polymer outer tube 14 is heat-shrinkably attached to the outer wall of the PET heat-shrinkable tube 13. Since the melting point of the PET heat-shrinkable tube 13 is higher than that of the polymer outer tube 14, the polymer outer tube 14 melts preferentially relative to the PET heat-shrinkable tube 13. The polymer melt generated by the heating of the polymer outer tube 14 is fused to the middle braided tube 12 and / or the inner liner tube 11 through several glue holes 131.

[0046] S7: Cooling and curing: The composite conduit obtained by processing S6 is cooled and cured by natural cooling or a cooling device to obtain the final composite conduit product;

[0047] S8: Quality Inspection: Perform visual inspection, mechanical property testing and microstructure analysis on the composite catheter products processed in S7 to ensure that the materials of each layer of the composite catheter product are well bonded and there is no delamination.

[0048] In this embodiment, the degreasing alkaline solution in step S1 mainly consists of sodium hydroxide, sodium silicate, and surfactant. Alkaline washing with this solution quickly removes oil stains from the outer surface of the inner liner tube 11, improving the anti-slip properties of the fibers of the intermediate braided tube 12 wrapped around the inner liner tube 11, and also enhancing the welding strength between the polymer outer tube 14 and the inner liner tube 11. In step S2, the fibers are metal wires with a diameter between 0.05-0.2 mm and a fineness controlled between 10-200 D. The braiding density of the intermediate braided tube 12 is set between 10-200 PPI. In step S3, a laser drilling machine or a high-precision mechanical drilling machine is used for punching. In step S4, ensuring the outer end of the PET heat shrink tube 13 is aligned with the outer end of the inner liner tube 11 is crucial. The fibers of the braided tube 12 are aligned to prevent them from being exposed after sealing, thus improving the safety of the composite conduit. Multiple glue-through holes 131 are evenly spaced on the surface of the PET heat-shrink tubing 13, effectively improving the uniformity of stress distribution in the radial direction of the conduit body 1. A cooling device is used to rapidly cool the assembled conduit body 1, allowing it to solidify and produce the final composite conduit product. Subsequent quality inspection ensures a high yield rate of composite conduits entering the market. The heating device in step S6 is either a hot air gun or a heat shrink machine. The heating temperature in step S6 is controlled between 100-250℃, and the heating time is controlled between 2-5 minutes. A cooling water tank is used as the cooling device in step S7.

[0049] The basic working principle of this invention is as follows: PET heat-shrink tubing 13 is fitted onto both ends of the inner liner tube 11, which is wrapped with an intermediate braided tube 12. Then, a polymer outer tube 14 is fitted onto the intermediate braided tube 12 with the PET heat-shrink tubing 13. The polymer outer tube 14 is made of PEBAX, and the inner liner tube 11 is made of PTFE. By heating the assembled conduit body 1, the outermost polymer outer tube 14 is heated first and the heat is transferred inwards sequentially. Because the polymer outer tube 14 has a low melting point... At the melting point of the PET heat shrink tubing 13, the polymer outer tube 14 melts and generates polymer melt, causing the middle part of the polymer outer tube 14 to absorb heat and fuse with the outer wall of the intermediate braided tube 12 and the inner liner tube 11. Meanwhile, the two ends of the polymer outer tube 14 melt, generating polymer melt that passes through the adhesive passage 131 and fuses with the intermediate braided tube 12 and the inner liner tube 11 located at both ends of the conduit body 1. Simultaneously, both the polymer outer tube 14 and the PET heat shrink tubing 13 possess heat shrinking properties, absorbing heat and... The internal shrinkage causes the PET heat shrink tubing 13 to tightly wrap around the inner braided tubing 12. After absorbing heat, the outer polymer tubing 14 tightly wraps around both the inner braided tubing 12 and the PET heat shrink tubing 13. This invention utilizes the inward wrapping force generated by the heat shrinking deformation of the PET heat shrink tubing 13, enabling it to firmly wrap the inner braided tubing 12 around the inner liner tubing 11. This improves the connection strength and concentricity between the two ends of the inner braided tubing 12 and the inner liner tubing 11. Simultaneously, multiple adhesive holes 13 are formed on the surface of the PET heat shrink tubing 13. 1. This allows the polymer molten material generated by the heating and melting of the outer polymer tube 14 to pass through the glue-through hole 131 and fuse with the outer wall of the middle braided tube 12 and the inner liner tube 11 inside the PET heat shrink tube 13. This improves the connection between the two ends of the outer polymer tube 14 and the middle braided tube 12 and the inner liner tube 11, thereby improving the end-sealing strength of the catheter body 1 and preventing delamination between adjacent tube layers of the catheter body 1. This has the effects of strong end-sealing of the catheter, less delamination between tube layers, and improved safety of catheter use.

[0050] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included in the scope of this patent application.

Claims

1. A method of end-capping a multi-lumen PET film end-capped composite catheter, characterized by, The composite catheter comprises a catheter body (1) comprising an inner liner tube (11), an intermediate braided tube (12) and a high-molecular outer tube (14) with thermal shrinkage performance arranged in sequence from inside to outside, wherein the material of the high-molecular outer tube (14) is PEBAX, and the material of the inner liner tube (11) is PTFE; The two ends of the catheter body (1) are provided with a PET thermal shrinkage tube (13) between the intermediate braided tube (12) and the high-molecular outer tube (14), the melting point of the PET thermal shrinkage tube (13) is higher than that of the high-molecular outer tube (14), a plurality of glue holes (131) are arranged on the surface of the PET thermal shrinkage tube (13), the PET thermal shrinkage tube (13) is wrapped outside the intermediate braided tube (12) through a thermal shrinkage process, the high-molecular outer tube (14) is attached to the outer wall of the PET thermal shrinkage tube (13) through a thermal shrinkage process, and the high-molecular melt generated by heating of the high-molecular outer tube (14) is fused to the intermediate braided tube (12) and / or the inner liner tube (11) through the glue holes (131); The end-capping method comprises the following steps: S1: inner liner tube (11) preparation: removing oil stains on the outer surface of the inner liner tube (11) by oil-removing lye to ensure that the outer surface of the inner liner tube (11) has sufficient adhesion; S2: intermediate braided tube (12) forming: fixing the inner liner tube (11) on a three-dimensional braiding machine, and three-dimensionally braiding a plurality of fiber filaments outside the inner liner tube (11) to form the intermediate braided tube (12), wherein the fiber filaments are metal wires, the diameter of the metal wires is between 0.05-0.2mm, the fineness is controlled to be between 10-200D, and the braiding density of the intermediate braided tube (12) is set to be between 10-200PPI; S3: PET thermal shrinkage tube (13) punching: uniformly arranging a plurality of glue holes (131) on the surface of the PET thermal shrinkage tube (13) by using a punching device, so that the plurality of glue holes (131) are arranged at equal intervals on the surface of the PET thermal shrinkage tube (13), the diameter of the glue holes (131) is set to be between 0.1-0.3mm, and the distance between adjacent glue holes (131) is set to be between 1-2mm; S4: sleeving the PET thermal shrinkage tube (13): sleeving the PET thermal shrinkage tube (13) obtained in S3 around the two ends of the inner liner tube (11) wrapped with the intermediate braided tube (12), so that the PET thermal shrinkage tube (13) is aligned with the outer extension of the corresponding end of the inner liner tube (11); S5: sleeving the high-molecular outer tube (14): sleeving the high-molecular outer tube (14) outside the intermediate braided tube (12) wrapped with the PET thermal shrinkage tube (13) at both ends, and forming a multi-layer wrapping material; S6: hot melt processing: the multi-layer wrapping material obtained in S5 is heated by a heating device, the heating temperature of the heating device is controlled between 100-250℃, and the heating time is controlled between 2-5min, so that the PET heat shrink tube (13) is heat-shrunk wrapped outside the intermediate braided tube (12), and the high molecular outer tube (14) is heat-shrunk attached to the outer wall of the PET heat shrink tube (13). Because the melting point of the PET heat shrink tube (13) is higher than that of the high molecular outer tube (14), the high molecular outer tube (14) melts preferentially relative to the PET heat shrink tube (13), and the high molecular melt generated by the high molecular outer tube (14) is melted with the intermediate braided tube (12) and / or the inner liner tube (11) through the glue holes (131), wherein the middle part of the high molecular outer tube (14) is melted and attached to the outer wall of the intermediate braided tube (12) and the inner liner tube (11), and the two ends of the high molecular outer tube (14) are melted to generate high molecular melt which passes through the glue holes (131) and is melted with the intermediate braided tube (12) and the inner liner tube (11) at both ends of the catheter body (1). At the same time, the high molecular outer tube (14) and the PET heat shrink tube (13) both have heat shrinkage characteristics, and the high molecular outer tube (14) and the PET heat shrink tube (13) are heated and shrink inwardly, so that the PET heat shrink tube (13) is tightly wrapped outside the intermediate braided tube (12), and the high molecular outer tube (14) is tightly wrapped outside the intermediate braided tube (12) and the PET heat shrink tube (13) after being heated; S7: cooling and solidification: the composite catheter obtained in S6 is cooled and solidified by natural cooling or a cooling device, and the final composite catheter product is obtained; S8: quality detection: the composite catheter product obtained in S7 is subjected to appearance inspection, mechanical property test and microscopic structure analysis to ensure that the composite catheter product is well bonded between the layers of materials and has no delamination phenomenon.

2. The method of endcapping a multi-lumen PET film endcapped composite conduit of claim 1, wherein: The punching device in step S3 is a laser punch or a high-precision mechanical punch.

3. The method of endcapping a multi-lumen PET film endcapped composite conduit of claim 1, wherein: The heating device in step S6 is a hot air gun or a heat shrink machine.

4. The method of endcapping a multi-lumen PET film endcapped composite conduit of claim 1, wherein: The cooling device in step S7 is a cooling water tank.

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