A processing and forming device for a braided composite catheter and a processing method thereof

Abstract

The present invention discloses a processing and forming device for a braided composite catheter, comprising a core shaft with a conductive heating function, a driving mechanism for driving the core shaft to translate along its own axial direction, a three-dimensional braiding machine, a circumferential sprayer and an electromagnetic heating structure, wherein the three-dimensional braiding machine is used to braid and form an intermediate braided layer on a tube core inserted on the core shaft, the circumferential sprayer can rotate along the circumference of the core shaft and spray molten polymer onto the outer wall of the tube core, and the electromagnetic heating structure heats the core shaft by electromagnetic induction and heats the molten polymer outside the tube core. The present invention has the following advantages and effects: the scheme utilizes a new mechanical structure, has the effects of saving costs, efficient processing, higher thermal efficiency, and effectively avoiding the core shaft from jumping during operation.

Description

Technical Field

[0001] The invention relates to the technical field of composite catheter processing, and in particular to a processing and molding device for a braided composite catheter and a processing method thereof. Background Art

[0002] Braided composite catheters generally have a three-layer structure, the innermost polymer smooth layer that will not melt, the middle braided reinforcement layer and the outermost coating layer. At present, the mainstream processing of medical braided composite catheters adopts reflow soldering. The basic steps include setting the tube core on the core shaft, and then reinforcing the outside of the tube core with a braided layer. After that, the outermost resin layer and the braided layer are assembled and put into a heat shrink tube. It is heated in a reflow soldering machine, and the heat shrink tube shrinks. Under the action of high pressure and heat, the outer layer material melts and composites with the braided wire of the braided layer to form a smooth and dense composite catheter. Finally, the heat shrink tube is peeled off and the catheter is pulled off the supporting core shaft.

[0003] The existing U.S. patent with publication number US10426917B2 discloses a system for manufacturing catheters, in which an actuator is set for translation in the length direction of the core shaft, and the actuator is used to release molten polymer or braided wire onto the core shaft, wherein the core shaft can rotate along its own axis. In addition, a heat curing device is set for translation in the length direction of the core shaft, and the surface of the molten polymer coated on the surface of the core shaft is heated by the heat curing device, and finally cooled and solidified, thereby improving the processing efficiency of the braided composite catheter.

[0004] However, the above-mentioned system for manufacturing the catheter has the following disadvantages:

[0005] 1. Since the mandrel is long and small in diameter, it has a large aspect ratio, and the mandrel needs to rotate continuously during the spraying process. The large aspect ratio causes the mandrel to jump during rotation, and the rotation stability is poor, which causes the actuator that translates along the length direction of the mandrel to release the braided wire and the molten polymer onto the tube core to achieve the braided wire winding and molten polymer coating. Deviations occur, which easily lead to the situation that the adjacent pitches of the braided wire are inconsistent when the braided wire is wound on the tube core, and also reduce the solidification uniformity and concentricity of the molten polymer on the tube core;

[0006] 2. Thermal curing equipment usually uses thermal radiation or hot air heating. During the heating process, the braided composite conduit heats the molten polymer from the outside to the inside. However, this heating method from the outside to the inside causes a large amount of heat loss due to the constant contact between the heat and the air for heat exchange, and the thermal efficiency is low. This makes it easy for the outer coating of the braided composite conduit to solidify on the outside but the inner area remains unsolidified, affecting the curing effect. If the heating residence time of the thermal curing equipment outside the braided composite conduit is extended, the production efficiency of the braided composite conduit will be reduced, which urgently needs to be improved. Summary of the invention

[0007] The purpose of the present invention is to provide a processing and forming device for a braided composite catheter and a processing method thereof, which has the effects of saving costs, efficient processing, higher thermal efficiency, and effectively avoiding the core shaft from jumping during operation.

[0008] The above technical objectives of the present invention are achieved through the following technical solutions: a processing and forming equipment for a braided composite catheter, comprising a core shaft with a conductive heating function, a driving mechanism for driving the core shaft to translate along its own axial direction, and also comprising a three-dimensional braiding machine, an annular sprayer and an electromagnetic heating structure. The three-dimensional braiding machine is used to weave and form an intermediate braided layer on a tube core inserted on the core shaft, the annular sprayer can rotate along the circumference of the core shaft and spray molten polymer onto the outer wall of the tube core, and the electromagnetic heating structure heats the core shaft through electromagnetic induction and heats the molten polymer outside the tube core.

[0009] By adopting the above technical scheme, during processing, the inner layer of the tube core is firstly fixed on the core shaft, and the core shaft can be driven to translate along its own axial direction through the driving mechanism, and at the same time, the warp and weft of the braided wires are interwoven on the outside of the tube core by a three-dimensional braiding machine to form an intermediate braided layer. During the braiding, the circumferential sprayer rotates around the core shaft, and at the same time, the molten polymer is circumferentially sprayed onto the outer wall of the tube core woven with the braided wires. When the tube core coated with the molten polymer translates axially, the core shaft cuts the electromagnetic field generated by the electromagnetic heating structure and generates heat, so that the core shaft is heated and heated, and the heat generated by the core shaft is used to gradually heat the molten polymer attached to the surface of the core shaft from the inside out, and the solvent in the molten polymer is heated and evaporated. Finally, the molten polymer is cooled to form a coating layer, and at the same time, the intermediate braided layer is firmly fixed to the outside of the tube core. The present invention uses magnetic induction heating instead of traditional thermal radiation or hot air heating, so that the core shaft generates a controllable temperature to heat the molten polymer attached to the outside. The molten polymer is heated to evaporate the solvent, so that the molten polymer can be solidified step by step from the inside to the outside, the heat transfer is more controlled, and it can be ensured that the heat is basically not lost, and the thermal efficiency is higher. At the same time, different from the existing situation that the core shaft is prone to jump when rotating due to its high aspect ratio, the present invention drives the core shaft to translate along its own axial direction through a driving mechanism, and uses a three-dimensional braiding machine and a circumferential sprayer to realize the winding of the braided wire and the spraying of the molten polymer on the core shaft, which can avoid the jumping of the core shaft and make the winding and spraying of the braided wire and the molten polymer on the outside of the tube core sleeved on the core shaft more uniform. In addition, the present invention increases the processing efficiency of the braided catheter and reduces the use cost of the heat shrink tube by braiding, coating and curing at the same time, thereby saving processing costs, having the effects of cost saving, efficient processing, higher thermal efficiency, and effectively avoiding the jumping of the core shaft during operation.

[0010] The present invention is further configured as follows: the driving mechanism comprises a driving control platform and a tractor disposed on the driving control platform, and the driving control platform is used to control the core shaft to translate along its own axial direction through the tractor.

[0011] By adopting the above technical solution, the drive control platform drives the tractor to operate, and uses the tractor to achieve the translation of the core shaft along its own axial direction. The tractor can use the existing linear motion module on the market.

[0012] The present invention is further configured as follows: the annular sprayer includes a mixing sleeve rotatably arranged outside the core shaft and a glue injection nozzle fixedly connected to the side wall of the mixing sleeve, the glue injection nozzle is connected to the glue outlet of the sprayer, the mixing sleeve is driven to rotate around the core shaft by a rotary drive mechanism, an annular flow channel is opened inside the mixing sleeve along the circumferential direction and at both ends in a sealed manner, the inner wall of the mixing sleeve is provided with a plurality of nozzles connected to the annular flow channel, the glue injection nozzle is used to heat and melt the molten polymer and then inject it into the annular flow channel and spray it annularly on the outer wall of the tube core through the plurality of nozzles.

[0013] By adopting the above technical solution, the rotary drive mechanism can drive the mixing sleeve to rotate around the core shaft. The sprayer heats the polymer into a molten state and injects it into the annular flow channel of the mixing sleeve through the injection nozzle. The molten polymer in the annular flow channel is evenly dispersed and then atomized and sprayed out through multiple nozzles on its inner wall. The sprayed atomized polymer is evenly adhered to the outer wall of the tube core.

[0014] The present invention is further configured as follows: a plurality of the nozzles are distributed in an array along the circumferential direction and the longitudinal direction of the mixing sleeve.

[0015] By adopting the above technical scheme, the multiple nozzles distributed in an array can improve the spraying efficiency of the molten polymer outside the tube core, so that the annular sprayer can rotate at a small angle to evenly spray the molten polymer outside the tube core through multiple nozzles to form a layer of coating. The thickness of the coating can be controlled by controlling the rotation speed of the annular sprayer or controlling the polymer spraying amount of the nozzle. In addition, the spraying of multiple layers of coating can be achieved by repeated rotational spraying or reciprocating spraying technology, thereby achieving large-thickness coating spraying, thereby controlling the thickness of the coating.

[0016] The present invention is further configured as follows: the electromagnetic heating structure comprises a magnetic induction coil wound around the core shaft and a shielding cover arranged outside the magnetic induction coil, and the magnetic induction coil is electrically connected to a variable frequency power output system.

[0017] By adopting the above technical solution, the variable frequency power output system is used to control the changes in the magnetic field around the magnetic induction coil, thereby changing the heating power of the core shaft inserted inside the magnetic induction coil, thereby controlling the heating temperature of the core shaft, making the heating power of the core shaft controllable. In addition, the shielding cover can shield the magnetic field outside the magnetic induction coil to prevent the magnetic field from interfering with the human body or other equipment.

[0018] Another technical purpose of the present invention is to provide a method for processing a braided composite catheter, comprising the following steps:

[0019] S1: The tube core is fixed on the core shaft, and the core shaft is driven to translate along its own axis direction by a driving mechanism, and at the same time, the warp and weft of the braided wire are interwoven on the outside of the tube core by a three-dimensional braiding machine to form an intermediate braided layer;

[0020] S2: When braiding is in progress, the annular sprayer rotates around the core shaft and simultaneously annularly sprays the molten polymer onto the outer wall of the tube core braided with the braiding wires;

[0021] S3: When the tube core coated with the molten polymer translates axially, the mandrel cuts the electromagnetic field generated by the electromagnetic heating structure and generates heat, so that the mandrel is heated and the heat generated by the mandrel is used to heat the molten polymer attached to the surface of the mandrel;

[0022] S4: The molten polymer cools to form a coating layer, and at the same time firmly fixes the middle braided layer outside the tube core.

[0023] The present invention is further configured as follows: the braiding density of the middle braided layer is 10-200 PPI.

[0024] The present invention is further configured as follows: the molten polymer sprayed by the annular sprayer is configured as one or more of TPU and PEBAX.

[0025] By adopting the above technical solution, the polymers of TPU material and PEBAX material can be atomized and sprayed in a molten state, and the atomized spraying method can achieve a more uniform and dense polymer coating outside the tube core.

[0026] The present invention is further configured as follows: the core shaft is made of stainless steel or carbon steel.

[0027] By adopting the above technical solution, a core shaft made of stainless steel or carbon steel is used to make the core shaft have high thermal conductivity, so that the electromagnetic heating structure can perform efficient magnetic induction heating on the core shaft, thereby improving the heating efficiency of the core shaft per unit time.

[0028] The present invention is further configured as follows: the volume V of the coating layer is film Satisfies the following formula:

[0029] Vfilm =V total -V core -V braid

[0030] Among them, V total is the total volume of the braided composite catheter, V core is the volume of the mandrel, V braid is the volume of the braided layer;

[0031] The volume of the braided layer satisfies the following formula:

[0032] V braid ≈n·L·A wire ·η

[0033] Where n is the number of braided layers, L is the length of the braided composite conduit, and A wire is the cross-sectional area of ​​the braided wire, η is the cross-sectional area coverage of the braided layer, and η<1;

[0034] Cross-sectional area of ​​braided wire A wire Satisfies the following formula:

[0035] A wire =N·πd wire 2 / 4

[0036] Where, N is the number of braided wires on the cross section, d wire is the diameter of the braided wire.

[0037] In summary, the present invention has the following beneficial effects:

[0038] A driving mechanism is used to drive the core shaft to translate along its own axial direction. At the same time, a three-dimensional braiding machine and a circumferential sprayer are arranged around the core shaft. In addition, a magnetic induction coil is wound around the outside of the core shaft, and a shielding cover for shielding the magnetic field is arranged outside the magnetic induction coil. During processing, the inner tube core is first fixed on the core shaft, and the driving mechanism can drive the core shaft to translate along its own axial direction. At the same time, the three-dimensional braiding machine is used to interweave the warp and weft of the braided silk on the outside of the tube core to form an intermediate braided layer. During braiding, the circumferential sprayer rotates around the core shaft and simultaneously sprays the molten polymer circumferentially onto the braided material. The outer wall of the tube core is woven with braided wires. When the tube core coated with molten polymer translates axially, the core shaft cuts the electromagnetic field generated by the electromagnetic heating structure and generates heat, so that the core shaft is heated up. The heat generated by the core shaft is used to gradually heat the molten polymer attached to the surface of the core shaft from the inside out, and the mixed solvent in the molten polymer is evaporated. Finally, the molten polymer is cooled to form a coating layer, and at the same time the middle braided layer is firmly fixed to the outside of the tube core, which has the effects of saving costs, efficient processing, higher thermal efficiency, and effectively avoiding the jumping of the core shaft during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a structural diagram of the present invention.

[0040] Figure 2 The present invention Figure 1 A partial enlarged view of area A.

[0041] Figure 3 It is a structural diagram of the annular sprayer of the present invention.

[0042] In the figure: 1. core shaft; 2. braided composite catheter; 21. tube core; 22. braided layer; 23. coating layer; 3. drive control platform; 31. tractor; 4. three-dimensional braiding machine; 5. annular sprayer; 51. glue injection nozzle; 52. mixing sleeve; 52a. annular flow channel; 53. nozzle; 6. magnetic induction coil; 61. shielding cover; 7. guide sleeve. DETAILED DESCRIPTION

[0043] The present invention will be further described below in conjunction with the accompanying drawings.

[0044] A processing and forming device for a braided composite catheter, such as Figure 1-2 As shown, it includes a core shaft 1 with a conductive heating function, a driving mechanism for driving the core shaft 1 to translate along its own axial direction, a three-dimensional braiding machine 4, a circumferential sprayer 5 and an electromagnetic heating structure. The three-dimensional braiding machine 4 is used to braid on the tube core 21 inserted on the core shaft 1 and form an intermediate braided layer 22. The circumferential sprayer 5 can rotate along the core shaft 1 and spray the molten polymer onto the outer wall of the tube core 21. The electromagnetic heating structure heats the core shaft 1 through electromagnetic induction and heats the molten polymer outside the tube core 21. The driving mechanism includes a drive control A platform 3 and a tractor 31 arranged on the drive control platform 3. The drive control platform 3 is used to control the translation of the core shaft 1 along its own axial direction through the tractor 31. The drive control platform 3 drives the tractor 31 to operate, and uses the tractor 31 to achieve the translation of the core shaft 1 along its own axial direction. The tractor 31 can use an existing linear motion module on the market. In addition, in this embodiment, a guide sleeve 7 is provided at the end of the core shaft 1 away from the tractor 31. The guide sleeve 7 is guided and cooperated with the braided composite catheter 2 formed outside the core shaft 1 to ensure the consistency of the translation direction of the core shaft 1.

[0045] like Figure 2As shown, the annular sprayer 5 includes a mixing sleeve 52 rotatably arranged outside the core shaft 1 and a glue injection nozzle 51 fixedly connected to the side wall of the mixing sleeve 52, the glue injection nozzle 51 is connected to the glue outlet of the sprayer, and the sprayer is composed of a feeding device, a heating device and an atomization source. The mixing sleeve 52 is driven to rotate around the core shaft 1 by a rotary drive mechanism. An annular flow channel 52a is opened in the mixing sleeve 52 along the circumferential direction and at both ends. The inner wall of the mixing sleeve 52 is provided with a plurality of nozzles 53 connected with the annular flow channel 52a. The glue injection nozzle 51 is used to heat and melt the molten polymer and then inject it into the annular flow channel 52a and spray it annularly on the outer wall of the tube core 21 through a plurality of nozzles 53. The rotary drive mechanism can drive the mixing sleeve 52 to rotate around the core shaft 1. The sprayer heats the polymer into a molten state, mixes it with the solvent, and injects it into the annular flow channel 52a of the mixing sleeve 52 through the glue injection nozzle 51. The addition of the solvent is beneficial to The molten polymer and the solvent are uniformly mixed to facilitate the atomization source to atomize and spray the molten polymer. After the molten polymer in the annular flow channel 52a is evenly dispersed, it is atomized and sprayed through multiple nozzles 53 on its inner wall, and the sprayed atomized polymer is uniformly adhered to the outer wall of the tube core 21; a plurality of nozzles 53 are arrayed along the circumference and length directions of the mixing sleeve 52, and the array-distributed multiple nozzles 53 can improve the spraying efficiency of the molten polymer outside the tube core 21, so that the annular sprayer 5 can rotate at a small angle to evenly spray the molten polymer on the outside of the tube core 21 through multiple nozzles 53 to form a layer of film. The thickness of the film can be controlled by controlling the rotation speed of the annular sprayer 5 or controlling the polymer spraying amount of the nozzle 53. In addition, the spraying of multiple layers of film can be achieved by repeated rotation spraying or reciprocating spraying technology, thereby achieving large-thickness film spraying, thereby controlling the thickness of the film.

[0046] like Figure 2-3 As shown, the electromagnetic heating structure includes a magnetic induction coil 6 wound around the core shaft 1 and a shielding cover 61 arranged outside the magnetic induction coil 6. The magnetic induction coil 6 is electrically connected to a variable frequency power output system. The variable frequency power output system is used to control the change of the magnetic field around the magnetic induction coil 6, thereby changing the heating power of the core shaft 1 passing through the magnetic induction coil 6, thereby controlling the heating temperature of the core shaft 1, so that the heating power of the core shaft 1 is controllable. In addition, the shielding cover 61 can shield the magnetic field outside the magnetic induction coil 6 to prevent the magnetic field from interfering with the human body or other equipment.

[0047] The basic working principle of the present invention is as follows: during processing, the inner layer tube core 21 is first sleeved and fixed on the core shaft 1, and the driving and controlling platform 3 controls the core shaft 1 to translate along its own axial direction through the traction device 31, and at the same time, the three-dimensional braiding machine 4 is used to interweave the warp and weft of the braided wires on the outside of the tube core 21 to form an intermediate braided layer 22. During the braiding process, the circumferential sprayer 5 rotates around the core shaft 1, and at the same time, the molten polymer and the solvent are evenly mixed by the sprayer, and then the molten polymer mixed with the solvent is circumferentially sprayed to the outer wall of the tube core 21 woven with the braided wires. When the tube core 21 coated with the molten polymer translates axially, the core shaft 1 cuts the electromagnetic field generated by the electromagnetic heating structure and generates heat, so that the core shaft 1 is heated and heated, and the heat generated by the core shaft 1 is used to gradually heat the molten polymer attached to the surface of the core shaft 1 from the inside to the outside, and the mixed solvent in the molten polymer is evaporated by heat. Finally, the molten polymer is cooled to form a coating layer 23, and at the same time, the intermediate braided layer 22 is firmly fixed on the outside of the tube core 21; the present invention uses magnetic induction heating instead of transmission The heat radiation or hot air heating of the system makes the core shaft 1 generate a controllable temperature to heat the molten polymer attached to the outside, so that the molten polymer can be solidified step by step from the inside to the outside, the heat transfer is more controlled, and it can be ensured that the heat is basically not lost, and the thermal efficiency is higher; at the same time, different from the existing situation that the core shaft 1 is prone to jump when rotating due to its high aspect ratio, the present invention drives the core shaft 1 to translate along its own axial direction through a driving mechanism, and uses a three-dimensional braiding machine 4 and a circumferential sprayer 5 to realize the winding of the braided wire and the spraying of the molten polymer on the core shaft 1, which can avoid the jumping of the core shaft 1 and make the winding and spraying of the braided wire and the molten polymer on the outside of the tube core 21 sleeved on the core shaft 1 more uniform. In addition, the present invention increases the processing efficiency of the braided catheter and reduces the use cost of the heat shrink tube by braiding, coating and curing at the same time, thereby saving processing costs, having the effects of cost saving, efficient processing, higher thermal efficiency, and effectively avoiding the jumping of the core shaft 1 during operation.

[0048] The present invention provides a method for processing a braided composite catheter, comprising the following steps:

[0049] S1: The tube core is fixed on the core shaft, and the core shaft is driven to translate along its own axis direction by a driving mechanism, and at the same time, the warp and weft of the braided wire are interwoven on the outside of the tube core by a three-dimensional braiding machine to form an intermediate braided layer;

[0050] S2: When braiding is in progress, the annular sprayer rotates around the core shaft, the sprayer uniformly mixes the solvent with the molten polymer, and annularly sprays the molten polymer mixed with the solvent onto the outer wall of the tube core braided with the braiding wire through the annular sprayer;

[0051] S3: When the tube core coated with the molten polymer translates axially, the mandrel cuts the electromagnetic field generated by the electromagnetic heating structure and generates heat, so that the mandrel is heated and the molten polymer attached to the surface of the mandrel is heated by the heat generated by the mandrel, and the solvent in the molten polymer is evaporated;

[0052] S4: The molten polymer is cooled to form a coating layer, and at the same time the middle braided layer is compositely fixed outside the tube core.

[0053] In the above steps, the weaving density of the middle braided layer is 10-200PPI; the molten polymer sprayed by the annular sprayer is set to one or more of TPU and PEBAX, and the polymers of TPU material and PEBAX material can be atomized and sprayed in the molten state, and the polymer coating outside the tube core can be made more uniform and dense by atomization spraying; the core shaft is set to stainless steel or carbon steel material, and the core shaft made of stainless steel or carbon steel material has high thermal conductivity, so that the electromagnetic heating structure can perform efficient magnetic induction heating on the core shaft, thereby improving the heating efficiency of the core shaft per unit time.

[0054] In addition, the volume V of the coating layer in this embodiment film Satisfies the following formula:

[0055] V film =V total -V core -V braid

[0056] Among them, V total is the total volume of the braided composite catheter, V core is the volume of the mandrel, V braid is the volume of the braided layer;

[0057] The volume of the braided layer satisfies the following formula:

[0058] V braid ≈n·L·A wire ·η

[0059] Where n is the number of braided layers, L is the length of the braided composite conduit, and A wire is the cross-sectional area of ​​the braided wire, η is the cross-sectional area coverage of the braided layer, and η<1;

[0060] Cross-sectional area of ​​braided wire A wire Satisfies the following formula:

[0061] A wire =N·πd wire 2 / 4

[0062] Where, N is the number of braided wires on the cross section, d wireis the diameter of the braided wire.

[0063] The above description is only a preferred embodiment of the present invention, so all equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A processing and forming device for a braided composite catheter, characterized in that: The invention comprises a core shaft (1) having a conductive heating function, a driving mechanism for driving the core shaft (1) to translate along its own axial direction, and also comprises a three-dimensional braiding machine (4), a circumferential sprayer (5) and an electromagnetic heating structure. The three-dimensional braiding machine (4) is used to braid on a tube core (21) inserted on the core shaft (1) to form an intermediate braided layer (22). The circumferential sprayer (5) can rotate along the circumference of the core shaft (1) and spray molten polymer onto the outer wall of the tube core (21). The electromagnetic heating structure heats the core shaft (1) by electromagnetic induction and heats the molten polymer outside the tube core (21). The driving mechanism comprises a driving control platform (3) and a tractor (31) arranged on the driving control platform (3), wherein the driving control platform (3) is used to control the core shaft (1) to translate along its own axial direction through the tractor (31); The annular sprayer (5) comprises a mixing sleeve (52) rotatably arranged outside the core shaft (1) and a glue injection nozzle (51) fixedly connected to the side wall of the mixing sleeve (52), the glue injection nozzle (51) being connected to the glue outlet of the sprayer, the mixing sleeve (52) being driven to rotate around the core shaft (1) by a rotary drive mechanism, an annular flow channel (52a) being provided inside the mixing sleeve (52) along the circumferential direction and at both ends being sealed, the inner wall of the mixing sleeve (52) being provided with a plurality of nozzles (53) connected to the annular flow channel (52a), the glue injection nozzle (51) being used to heat and melt the molten polymer and then inject it into the annular flow channel (52a) and spray it annularly on the outer wall of the tube core (21) through the plurality of nozzles (53); The electromagnetic heating structure comprises a magnetic induction coil (6) wound around the outside of the core shaft (1) and a shielding cover (61) arranged outside the magnetic induction coil (6); the magnetic induction coil (6) is electrically connected to a variable frequency power output system; A guide sleeve (7) is provided at one end of the core shaft (1) away from the tractor (31), and the guide sleeve (7) cooperates with the braided composite catheter formed outside the core shaft (1) to ensure the consistency of the translation direction of the core shaft (1).

2. The processing and forming equipment of a braided composite catheter according to claim 1, characterized in that: The plurality of nozzles (53) are distributed in an array along the circumference and length direction of the mixing sleeve (52).

3. A method for processing a braided composite conduit according to any one of claims 1 to 2, characterized in that: The following steps are involved: S1: The tube core is fixed on the core shaft, and the core shaft is driven to translate along its own axis direction by a driving mechanism, and at the same time, the warp and weft of the braided wire are interwoven on the outside of the tube core by a three-dimensional braiding machine to form an intermediate braided layer; S2: When braiding is in progress, the annular sprayer rotates around the core shaft and simultaneously annularly sprays the molten polymer onto the outer wall of the tube core braided with the braiding wires; S3: When the tube core coated with the molten polymer translates axially, the mandrel cuts the electromagnetic field generated by the electromagnetic heating structure and generates heat, so that the mandrel is heated and the heat generated by the mandrel is used to heat the molten polymer attached to the surface of the mandrel; S4: The molten polymer cools to form a coating layer, and at the same time firmly fixes the middle braided layer outside the tube core.

4. The method for processing a braided composite catheter according to claim 3, characterized in that: The braiding density of the middle braided layer is 10-200 PPI.

5. The method for processing a braided composite catheter according to claim 3, characterized in that: The molten polymer sprayed by the annular sprayer is set to be one or more of TPU and PEBAX.

6. The method for processing a braided composite catheter according to claim 3, characterized in that: The core shaft is made of stainless steel or carbon steel.

7. The method for processing a braided composite catheter according to claim 3, characterized in that: The volume of the film layer Vfilm satisfies the following formula: Vfilm=Vtotal-Vcore-Vbraid Wherein, Vtotal is the total volume of the braided composite catheter, Vcore is the volume of the core shaft, and Vbraid is the volume of the braided layer; The volume of the braided layer satisfies the following formula: Vbraid≈n·L·Awire·η Wherein, n is the number of braided layers, L is the length of the braided composite conduit, Awire is the cross-sectional area of ​​the braided wire, η is the coverage of the cross-sectional area of ​​the braided layer, and η<1; The cross-sectional area of ​​the braided wire Awire satisfies the following formula: Awire=N·πdwire2 / 4 Where, N is the number of braided wires on the cross section, and dwire is the diameter of the braided wire.

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