High strength and durable balloon catheter for deep vein

Abstract

The application relates to the technical field of balloon catheters, in particular to a high-strength and durable balloon catheter for deep veins, which comprises a catheter and a connecting pipe, the inner wall of the catheter is movably connected with a communicating pipe, one side of the communicating pipe corresponding to the catheter is provided with an iron filament, the outer wall of the catheter is sequentially provided with a polytetrafluoroethylene layer, a toughness layer and a wear-resistant layer, one end of the catheter is fixedly connected with the connecting pipe, the outer wall of the connecting pipe is provided with a balloon main body, the upper end of the balloon main body is provided with a reinforcing layer and a thermoplastic polyurethane layer, the side close to the balloon main body of the connecting pipe is fixedly connected with a displacement section, the material of the balloon main body can be tightly combined with the thermoplastic polyurethane layer and the reinforcing layer, so that the balloon main body is not easy to fall off, the durability of the device is increased, the user can fold the catheter into a shape required by the human body, the use flexibility of the device is improved, the high-strength and durability of the device are increased, and the service life is prolonged.

Description

Technical Field

[0001] This invention relates to the field of balloon catheter technology, and more particularly to a high-strength and durable balloon catheter for deep veins. Background Technology

[0002] Balloon catheters are commonly used accessory instruments. They are catheter-like medical devices with an inflatable balloon fixed to the distal end. Before use, the balloon is in a deflated and folded state. Generally, during surgery, under the guidance of a guidewire, the balloon catheter is pushed along the blood vessel to the narrowed area. Then, an external pressure device is connected to the catheter tip to inflate the balloon, ensuring complete contact between the balloon wall and the inner wall of the bile duct. Traditional balloon catheters combine the balloon and catheter into one unit. To ensure a large burst pressure, the balloon in these catheters is relatively thick. However, excessive balloon wall thickness can lead to poor passage through blood vessels. Additionally, the catheter is made of a soft material. To facilitate a comfortable fit to the body, users typically adjust the shape of the catheter tip. However, due to the material characteristics of the catheter, it tends to spring back when folded, resulting in poor catheter support, affecting the flexibility of balloon catheter use, and reducing its wear resistance.

[0003] CN 111467658 A discloses a balloon catheter for transjugular intrahepatic portosystemic shunt (TIPS). The fabricated balloon catheter displays the relative positions of the inferior vena cava, hepatic vein, and portal vein through balloon dilation and portal venography. The distance between these veins is calculated by counting radiopaque markers, facilitating the physician's selection of stent length and placement of the TIPS-specific stent. However, the balloon catheter lacks a support structure, making it prone to deformation and shell wear over long-term use. CN205360219 U discloses a pre-formed balloon catheter for gastric coronary vein embolization. This catheter comprises a pre-formed catheter, a balloon, and a balloon catheter, combining the pre-formed angiography catheter with the balloon catheter and featuring a unique shape design. However, this balloon catheter has a fixed shape and cannot be modified according to usage needs, limiting its applicability. Furthermore, the wear resistance of the balloon catheter is not demonstrated, further restricting its practical application. CN114832212 A discloses a renal dialysis arteriovenous dilation balloon catheter. This balloon catheter can fix the patient's arm, preventing the patient from unintentionally shaking the arm, which could cause the arm to loosen and affect renal dialysis. It can also facilitate the withdrawal and correction of a bent balloon catheter. However, the various parts of this balloon catheter are connected by connecting rings and slide rails, which makes it easy to limit the angle adjustment during use. Long-term use can also cause aging and affect operation. Summary of the Invention

[0004] To address the aforementioned problems in the existing technology, a balloon catheter capable of rapidly releasing drugs is provided.

[0005] The specific technical solution is as follows:

[0006] Design a high-strength and durable deep vein balloon catheter, including a catheter and a connecting tube. A connecting tube is movably connected to the inner wall of the catheter. A thin iron wire is provided on the side of the connecting tube corresponding to the catheter. The outer wall of the catheter is sequentially provided with a polytetrafluoroethylene layer, a toughening layer, and a wear-resistant layer. The connecting tube is fixedly connected to one end of the catheter and communicates with the inner wall of the connecting tube. A balloon body is provided on the outer wall of the connecting tube. A reinforcing layer and a thermoplastic polyurethane layer are provided on the upper end of the balloon body. A displacement section is fixedly connected to the side of the connecting tube closest to the balloon body. A connecting tube is fixedly connected to the outer wall of the catheter and communicates with the interior of the connecting tube. A guidewire is provided at the end of the catheter away from the connecting tube.

[0007] Preferably, the thin iron wire is fixedly sleeved on the outer wall of the connecting pipe, and the outer wall of the thin iron wire is fixedly connected to the inner wall of the conduit.

[0008] Preferably, the connecting tube is fixedly connected to the inner wall of the conduit by the thin iron wire, and the connecting tube and the conduit are arranged concentrically.

[0009] Preferably, the polytetrafluoroethylene (PTFE) layer is fixedly connected to the outer wall of the conduit, a toughening layer is fixedly connected to one end of the PTFE layer, and a wear-resistant layer is fixedly connected to the end of the toughening layer away from the PTFE layer. The toughening layer, the wear-resistant layer, and the PTFE layer are integrally formed with the conduit.

[0010] Preferably, the balloon body is fixedly sleeved on the outer wall of the connecting tube, and an air vent ring is fixedly sleeved on the outer wall of the connecting tube, with the air vent ring located on the inner wall of the balloon body, thus forming a sealed state between the balloon body and the connecting tube.

[0011] Preferably, the thermoplastic polyurethane layer is fixedly connected to the upper end of the balloon body, and a reinforcing layer is fixedly connected to the upper end of the thermoplastic polyurethane layer. The thermoplastic polyurethane layer and the reinforcing layer are integrally formed with the balloon body.

[0012] Preferably, the guidewire is fixedly connected to the end of the catheter away from the connecting tube, and the guidewire and the catheter are in a sealed state.

[0013] Preferably, the raw materials for preparing the wear-resistant layer (18) include, by weight, at least: 70-80 parts of natural rubber, 80-120 parts of silicone resin, 5-10 parts of synthetic rubber, 2-7 parts of activator, 1-5 parts of antioxidant, 1-5 parts of plasticizer, and 2-6 parts of crosslinking agent.

[0014] Preferably, the synthetic rubber is at least one of butyl rubber, nitrile rubber, and chloroprene rubber.

[0015] Preferably, the silicone resin is at least one of benzylmalonate polysiloxane, methylphenyl dichlorosilane, and polydimethylsiloxane.

[0016] Preferably, the silicone resin is polydimethylsiloxane with a viscosity of 500 cst.

[0017] In this application, by selectively adding polydimethylsiloxane with a specific viscosity, the wear resistance of the wear-resistant layer is effectively improved. In particular, when the viscosity of polydimethylsiloxane is 500 cst, the viscosity of polydimethylsiloxane is low but its volatility is moderate. At this point, the low viscosity polydimethylsiloxane has a large Si-O-Si bond angle, a large Si-O bond, a low internal rotation barrier, and is relatively easy to rotate internally. The entire molecular chain has good flexibility, and the low viscosity makes it easy to form a fluid state, allowing the Si-O chains to migrate to the surface of the wear-resistant layer, reducing the surface free energy, and forming a continuous protective film. Moreover, polydimethylsiloxane with a viscosity of 500 cst can synergistically work with natural rubber and synthetic rubber to prevent the oxidative decomposition and excessive cross-linking of organic side groups. This can improve the corrosion resistance of the wear-resistant layer as well as its toughness and elasticity, giving it excellent practicality.

[0018] Preferably, the activator is at least one of nano-magnesium oxide, magnesium chloride, and calcium oxide.

[0019] Preferably, the antioxidant is at least one of antioxidant 4010NA, antioxidant RD, and antioxidant MB.

[0020] Preferably, the plasticizer is at least one of paraffin oil, aromatic oil, and petrolatum.

[0021] Preferably, the method for preparing the wear-resistant layer (18) includes the following steps:

[0022] (1) Place natural rubber, silicone resin and synthetic rubber in a mixer and mix them;

[0023] (2) Add activator, antioxidant, plasticizer and crosslinking agent to the mixture in (1) and mix and remove the glue to obtain the final product.

[0024] Preferably, the mixing temperature in steps (1) and (2) is 55-90°C.

[0025] Beneficial effects:

[0026] 1. By setting the balloon body in conjunction with a thermoplastic polyurethane layer and a reinforcing layer, the thermoplastic polyurethane layer is a linear polymer with a structure including hard segments and elastic soft segments. It has good processability, biocompatibility, and wear resistance. The reinforcing layer has good toughness, high tensile and compressive strength, outstanding fatigue resistance, smooth surface, low coefficient of friction, corrosion resistance, and good anti-aging ability. At the same time, the balloon body is made of a high-molecular elastomer. The selection of specific compositions allows the balloon body to meet the burst pressure requirements while being thin, and it also has good dimensional stability, high temperature resistance, biocompatibility, and hydrophilicity. Furthermore, the balloon body material itself can be tightly bonded to the thermoplastic polyurethane layer and the reinforcing layer, making it less prone to falling off and increasing the durability of the device.

[0027] 2. By setting up a thin iron wire to work with the connecting tube and the conduit, the thin iron wire is wrapped around the outer wall of the connecting tube and located at the end of the inner wall of the conduit. The thin iron wire is a bendable iron wire, which supports the connecting tube and provides resistance to the inner wall of the conduit. The location on the inner wall of the conduit increases stability and makes it easy for the user to bend it into the shape they need. After bending, it has high plasticity and is easy to fix. It can be folded into the desired shape by the user through the conduit and the shape of the human body, thereby improving the flexibility of the device, increasing the strength and durability of the device, and extending its service life.

[0028] 3. By setting a polytetrafluoroethylene layer, a toughness layer, and a wear-resistant layer on the outer wall of the catheter, the high strength and durability of the balloon catheter are improved. The wear resistance is enhanced by adding a specific low-viscosity polydimethylsiloxane, which works synergistically with natural and synthetic rubber. This allows the siloxane chains to migrate to the surface of the wear-resistant layer, reducing the surface free energy and forming a protective film covering the surface of the wear-resistant layer, thereby reducing the coefficient of friction and improving wear resistance. It also prevents the oxidative decomposition and excessive cross-linking of organic side groups, improving the toughness and elasticity of the wear-resistant layer, making it highly practical. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural diagram of a high-strength and durable deep vein balloon catheter proposed in this invention;

[0030] Figure 2 This is a schematic diagram of the wire structure of a high-strength and durable deep vein balloon catheter proposed in this invention;

[0031] Figure 3 This is a schematic diagram of the thermoplastic polyurethane layer structure of a high-strength and durable deep vein balloon catheter proposed in this invention.

[0032] Figure 4This is a schematic diagram of the polytetrafluoroethylene layer structure of a high-strength and durable deep vein balloon catheter proposed in this invention.

[0033] The above reference numerals indicate: catheter 1, connecting tube 12, guide wire tube 13, connecting tube 14, iron wire 15, polytetrafluoroethylene layer 16, toughening layer 17, wear-resistant layer 18, connecting tube 2, balloon body 21, thermoplastic polyurethane layer 22, reinforcing layer 23, exhaust ring 24, displacement segment 25. Detailed Implementation

[0034] 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.

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0036] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0037] Example 1

[0038] Reference Figure 1-4 A high-strength and durable deep vein balloon catheter includes a catheter 1 and a connecting tube 2. A connecting tube 14 is movably connected to the inner wall of the catheter 1. A thin iron wire 15 is provided on the side of the connecting tube 14 corresponding to the catheter 1. A polytetrafluoroethylene layer 16, a tough layer 17, and a wear-resistant layer 18 are sequentially provided on the outer wall of the catheter 1. The connecting tube 2 is fixedly connected to one end of the catheter 1 and communicates with the inner wall of the connecting tube 14. A balloon body 21 is provided on the outer wall of the connecting tube 2. A reinforcing layer 23 and a thermoplastic polyurethane layer 22 are provided on the upper end of the balloon body 21. A displacement section 25 is fixedly connected to the side of the connecting tube 2 close to the balloon body 21. A connecting tube 12 is fixedly connected to the outer wall of the catheter 1 and communicates with the interior of the connecting tube 14. A guide wire 13 is provided at the end of the catheter 1 away from the connecting tube 2.

[0039] Furthermore, the thin iron wire 15 is fixedly sleeved on the outer wall of the connecting pipe 14, and the outer wall of the thin iron wire 15 is fixedly connected to the inner wall of the conduit 1.

[0040] Furthermore, the connecting tube 14 is fixedly connected to the inner wall of the conduit 1 by a thin iron wire 15. The connecting tube 14 and the conduit 1 are concentrically arranged. The thin iron wire 15 is used to cooperate with the connecting tube 14 and the conduit 1. The thin iron wire 15 is wrapped around the outer wall of the connecting tube 14 and is located at the end of the inner wall of the conduit 1. The thin iron wire 15 is a bendable iron wire, which supports the connecting tube 14 on the inner wall of the conduit 1 and has resistance. It is located on the inner wall of the conduit 1 to increase stability and facilitate the user to bend it into the required shape. After bending, it has high plasticity and is easy to fix. It can be folded into the required shape by the user through the conduit 1 and the shape of the human body, thereby improving the flexibility of the device and increasing its strength and durability. It is compatible with the material of the conduit 1, which is made of polytetrafluoroethylene layer 16 and toughness layer 17, thus improving its service life and making it easy to use. The end of the conduit 1 is located on the outer side of the human body.

[0041] Furthermore, the polytetrafluoroethylene layer 16 is fixedly connected to the outer wall of the conduit 1, and a tough layer 17 is fixedly connected to one end of the polytetrafluoroethylene layer 16. A wear-resistant layer 18 is fixedly connected to the end of the tough layer 17 away from the polytetrafluoroethylene layer 16. The tough layer 18, the polytetrafluoroethylene layer 16 and the conduit 1 are integrally formed.

[0042] The catheter 1 is made of a polytetrafluoroethylene layer 16, a toughness layer 17, and a wear-resistant layer 18. The polytetrafluoroethylene layer 16 has chemical stability with anti-oxidation and corrosion resistance, as well as chemical inertness that does not change when in contact with body fluids. The toughness layer 17 is a nylon layer with excellent mechanical properties and functionality, and can be implanted in the body for a long time without losing physical and mechanical properties such as tensile strength and elastic modulus. The polycarbonate layer has excellent processability. The materials of this device can be selected from various types of known materials.

[0043] Furthermore, the balloon body 21 is fixedly sleeved on the outer wall of the connecting tube 2. An air vent ring 24 is fixedly sleeved on the outer wall of the connecting tube 2, and the air vent ring 24 is located on the inner wall of the balloon body 21. The balloon body 21 and the connecting tube 2 form a sealed state. Air is implanted through the connecting tube 12 and the air is sealed on the inner wall of the connecting tube 12. It is guided by the connecting tube 14 and the air is implanted on the inner wall of the balloon body 21 through the air vent ring 24. The air vent ring 24 surrounds the inner wall of the balloon body 21 to make the implanted air more uniform, which makes it easier for the balloon body 21 to block the affected area. The balloon body 21 expands through the implantation of air, which is convenient for free adjustment according to the size and improves the flexibility of the use of this device.

[0044] Furthermore, the thermoplastic polyurethane layer 22 is fixedly connected to the upper end of the balloon body 21, and a reinforcing layer 23 is fixedly connected to the upper end of the thermoplastic polyurethane layer 22. The thermoplastic polyurethane layer 22, the reinforcing layer 23 and the balloon body 21 are integrally formed. The thermoplastic polyurethane layer 22 is a linear polymer. Its structure includes hard segments and elastic soft segments. It has good processability, and good biocompatibility and wear resistance. The reinforcing layer 23 is a nylon layer with good toughness, high tensile and compressive strength, outstanding fatigue resistance, smooth surface, low coefficient of friction, corrosion resistance and good anti-aging ability. At the same time, the balloon body 21 is made of a high molecular elastomer. The selection of a specific composition allows the balloon body 21 to meet the burst pressure requirements while being thin. The materials of this device are selected from various types of known materials that can be used to make it.

[0045] Furthermore, the guidewire 13 is fixedly connected to the end of the catheter 1 away from the connecting tube 2. The guidewire 13 and the catheter 1 are in a sealed state. The guidewire is embedded in the guidewire through the guidewire 13 and located at one end of the displacement section 25, which moves the whole body and drives the balloon body 21 through the ring to block both ends of the affected area, making the work easier.

[0046] Working principle: When using this device, a balloon body 21 is combined with a thermoplastic polyurethane layer 22 and a reinforcing layer 23. The thermoplastic polyurethane layer 22 is a linear polymer with a structure including hard segments and elastic soft segments. It has good processability, biocompatibility, and wear resistance. The reinforcing layer 23 has good toughness, high tensile and compressive strength, outstanding fatigue resistance, smooth surface, low coefficient of friction, corrosion resistance, and good anti-aging ability. Meanwhile, the balloon body 21 is made of a high-molecular elastomer. The selection of specific compositions allows the balloon body 21 to meet the burst pressure requirements while being thin. It also has good dimensional stability, high temperature resistance, biocompatibility, and hydrophilicity. As a result, the material of the balloon body 21 itself can be tightly bonded to the thermoplastic polyurethane layer 22 and the reinforcing layer 23, making it less likely to fall off and increasing the durability of the device.

[0047] By setting a thin iron wire 15 to work with the connecting tube 14 and the conduit 1, the thin iron wire 15 is wrapped around the outer wall of the connecting tube 14 and located at the end of the inner wall of the conduit 1. The thin iron wire 15 is a bendable iron wire, which supports the connecting tube 14 on the inner wall of the conduit 1 and provides resistance. It is located on the inner wall of the conduit 1 to increase stability and makes it easy for the user to bend it into the shape as needed. After bending, it has high plasticity and is easy to fix. It can be folded into the desired shape by the user through the conduit 1 and the shape of the human body, thereby improving the flexibility of the device, increasing the strength and durability of the device, and extending its service life.

[0048] The raw materials for preparing the wear-resistant layer, by weight, include: 75 parts natural rubber, 100 parts silicone resin, 10 parts synthetic rubber, 5 parts activator, 3 parts antioxidant, 4 parts plasticizer, and 4 parts crosslinking agent.

[0049] Natural rubber (CAS No.: 9006-04-6), purchased from Shanghai E. En Chemical Technology Co., Ltd., model R121545.

[0050] The silicone resin is polydimethylsiloxane (CAS No.: 63148-62-9), with a viscosity of 500 cst, purchased from Shanghai E. En Chemical Technology Co., Ltd., model number R017341.

[0051] The synthetic rubber is chloroprene rubber (CAS No.: 9010-98-4), purchased from Shanghai E. En Chemical Technology Co., Ltd., model R139358.

[0052] The activator was nano magnesium oxide (CAS No.: 1309-48-4), purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., model M141191.

[0053] The antioxidant is a mixture of antioxidant RD and antioxidant MB, with a mass ratio of antioxidant RD to antioxidant MB of 1.25:1.

[0054] Antioxidant RD (CAS No.: 26780-96-1) was purchased from Shanghai Maclean Biochemical Technology Co., Ltd., model number P824729; Antioxidant MB (CAS No.: 583-39-1) was purchased from Jinan Xinrui Rubber & Plastic Technology Co., Ltd.

[0055] The plasticizer is a mixture of paraffin oil and petrolatum, with a mass ratio of paraffin oil to petrolatum of 0.85:1.

[0056] Paraffin oil (CAS No.: 64475-85-0), purchased from Dr. Ehenstorfer, Germany, model GA09010316DI; Vaseline (CAS No.: 8009-03-8), purchased from Thermo Fisher Scientific, model C41709.

[0057] The method for preparing the wear-resistant layer (18) includes the following steps:

[0058] (1) Place natural rubber, silicone resin and synthetic rubber in a mixer and mix them;

[0059] (2) Add activator, antioxidant, plasticizer and crosslinking agent to the mixture in (1) and mix and remove the glue to obtain the final product.

[0060] The mixing temperature in steps (1) and (2) is 75°C.

[0061] Example 2

[0062] The specific implementation method of this embodiment is the same as that of Embodiment 1, except that the viscosity of polydimethylsiloxane is 50 cst (too low viscosity).

[0063] Example 3

[0064] The specific implementation method of this embodiment is the same as that of Embodiment 1, except that the viscosity of polydimethylsiloxane is 12500 cst (high viscosity).

[0065] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

[0066] Performance Evaluation

[0067] 1. Abrasion resistance test: The abrasion resistance of the abrasion layers of different balloon catheters in Examples 1-3 were tested according to GB 9867-2008 "Determination of abrasion resistance of vulcanized rubber or thermoplastic rubber (rotary roller abrasion tester method)". The average value of the measured results is recorded in Table 1.

[0068] 2. Elongation at break test: The elongation at break of the wear-resistant layer of the different balloon catheters in Examples 1-3 was tested according to GB / T528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber". The average value of the measured results is recorded in Table 1.

[0069] Table 1

[0070] Example <![CDATA[Wear amount (mm 3 )]]> Elongation at break (%) Example 1 56.3 687 Example 2 61.2 594 Example 3 59.8 633

Claims

1. A durable balloon catheter for deep veins, characterized in that: The device includes a conduit (1) and a connecting tube (2). A connecting tube (14) is movably connected to the inner wall of the conduit (1). A thin iron wire (15) is provided on the side of the connecting tube (1) corresponding to the conduit (1). A polytetrafluoroethylene layer (16), a toughness layer (17), and a wear-resistant layer (18) are sequentially provided on the outer wall of the conduit (1). The connecting tube (2) is fixedly connected to one end of the conduit (1) and communicates with the inner wall of the connecting tube (14). A balloon body (21) is provided on the outer wall of the connecting tube (2). A reinforcing layer (23) and thermoplastic polyurethane are provided on the upper end of the balloon body (21). The ester layer (22) is fixedly connected to the distal end of the connecting tube (2) near the balloon body (21) with a displacement segment (25). The outer wall of the catheter (1) is fixedly connected to a connecting tube (12), and the connecting tube (12) communicates with the interior of the connecting tube (14). A guide wire tube (13) is provided at the end of the catheter (1) away from the connecting tube (2). The iron wire (15) is fixedly sleeved on the outer wall of the connecting tube (14), and the outer wall of the iron wire (15) is fixedly connected to the inner wall of the catheter (1). The connecting tube (14) is fixedly connected to the catheter (1) through the iron wire (15). The inner wall of the connecting tube (14) is concentrically arranged with the conduit (1); the polytetrafluoroethylene layer (16) is fixedly connected to the outer wall of the conduit (1), one end of the polytetrafluoroethylene layer (16) is fixedly connected to a tough layer (17), and the end of the tough layer (17) away from the polytetrafluoroethylene layer (16) is fixedly connected to a wear-resistant layer (18). The tough layer (17), the wear-resistant layer (18), the polytetrafluoroethylene layer (16) and the conduit (1) are integrally formed; the balloon body (21) is fixedly sleeved on the outer wall of the connecting tube (2), and the outer wall of the connecting tube (2) is fixedly sleeved with an air vent ring ( 24), and the exhaust ring (24) is located on the inner wall of the balloon body (21), the balloon body (21) and the connecting tube (2) form a sealed state; the thermoplastic polyurethane layer (22) is fixedly connected to the upper end of the balloon body (21), and a reinforcing layer (23) is fixedly connected to the upper end of the thermoplastic polyurethane layer (22), the thermoplastic polyurethane layer (22), the reinforcing layer (23) and the balloon body (21) are integrally formed; the guide wire (13) is fixedly connected to the end of the catheter (1) away from the connecting tube (2), and the guide wire (13) and the catheter (1) are in a sealed state; The raw materials for preparing the wear-resistant layer (18) include, by weight, at least: 70-80 parts of natural rubber, 80-120 parts of silicone resin, 5-10 parts of synthetic rubber, 2-7 parts of activator, 1-5 parts of antioxidant, 1-5 parts of plasticizer, and 2-6 parts of crosslinking agent; the silicone resin is polydimethylsiloxane with a viscosity of 500 cst. The reinforcing layer is a nylon layer.

2. The durable deep vein balloon catheter according to claim 1, characterized in that: The method for preparing the wear-resistant layer (18) includes the following steps: (a) Place natural rubber, silicone resin and synthetic rubber in an internal mixer and mix them; (b) Add activator, antioxidant, plasticizer and crosslinking agent to the mixture in (a) and mix and remove the glue to obtain the final product.

3. The durable deep vein balloon catheter according to claim 2, characterized in that: The mixing temperature in steps (a) and (b) is 55–90°C.

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