A special device for coating catheters during insertion.

Abstract

This invention relates to a special device for coating catheters, comprising a circulating conveying mechanism including a conveyor belt rotating in a ring, with multiple clamps for holding and fixing the catheters fixed on the conveyor belt by a fixing component; a driving component for driving the conveyor belt to rotate; a guide rail for guiding the clamps to move with the conveyor belt, the clamps being slidably connected to the guide rail via a guiding component and moving along the guide rail; and an automatic coating mechanism including: a feeding component, with a through hole at the bottom of the catheter for supplying coating liquid into the catheter, the feeding component pumping the coating liquid into the catheter from the through hole at the bottom of the catheter; a connecting component for connecting the feeding component and the catheter at the connection point and sealing it; and a storage component located at the opening at the top of the catheter for storing coating liquid overflowing from the top of the catheter, the storage component including an accumulator and a connecting pipe, the accumulator being connected to the opening at the top of the catheter via the connecting pipe. This application can improve coating efficiency.

Description

Technical Field

[0001] This invention relates to the field of coating equipment, and in particular to a special equipment for coating catheters and cannulas. Background Technology

[0002] In the medical field, doctors often use medical catheters for diagnosis and treatment of blood vessels, as well as to support guidewires, such as common balloon catheters, ultrasound catheters, and pressure microcatheters. When blood passes through a catheter, there is a possibility of blood clotting and adhering to the inner wall, which can reduce blood flow, even causing catheter blockage, damaging blood cells, and affecting the treatment process. Therefore, an anticoagulant membrane needs to be coated on the inner wall of the catheter.

[0003] Typically, staff manually apply a coating to the catheter. During the coating process, the catheter is held in place by a fixture. Then, the staff, wearing medical gloves, injects the coating solution into the catheter using a syringe until it overflows from the catheter opening. At this point, the coating solution completely covers the inner wall of the catheter. The excess coating solution is then poured out, and finally, the coated catheter is left to air dry at a constant temperature.

[0004] Regarding the aforementioned technologies, the inventors discovered that the coating operation is time-consuming and labor-intensive. When large-scale coating of catheters is required, it prolongs the processing cycle of catheter insertion, and the coating efficiency needs to be improved. Summary of the Invention

[0005] To address the aforementioned technical problems, this application provides a dedicated device for coating catheters during insertion.

[0006] The technical solution of the special device for coating catheter insertion membrane provided in this application is as follows:

[0007] A special device for coating catheters includes a protective housing, and the protective housing is equipped with a circulation conveying mechanism and an automatic coating mechanism;

[0008] The circulating conveying mechanism includes:

[0009] The conveyor belt rotates in a ring, and multiple clamps for holding and fixing catheters are fixed on the conveyor belt by a fixing assembly; one side of the conveyor belt in the width direction is a loading and unloading station, and the other side of the conveyor belt in the width direction is a coating station;

[0010] Drive assembly for driving the conveyor belt to rotate;

[0011] A guide rail is used to guide the clamp to move with the conveyor belt. The shape of the guide rail is adapted to the shape of the conveyor belt. The clamp is slidably connected to the guide rail through a guide assembly and moves along the guide rail.

[0012] The automatic coating mechanism includes:

[0013] The feeding assembly has a through hole at the bottom of the catheter cannula for the coating liquid to enter the interior of the catheter cannula. The feeding assembly pumps the coating liquid into the interior of the catheter cannula from the through hole at the bottom of the catheter cannula.

[0014] Connecting assembly, used to connect and seal the connection between the feeding assembly and the catheter insertion tube;

[0015] The material storage assembly, located at the opening at the top of the catheter cannula, is used to absorb the coating liquid overflowing from the top of the catheter cannula. The material storage assembly includes an accumulator and a connecting pipe. The accumulator is connected to the opening at the top of the catheter cannula through the connecting pipe. When the coating liquid absorbed by the accumulator reaches a specified amount, the pressure inside the accumulator reaches a specified pressure value. At this time, the accumulator delivers the coating liquid from the opening at the top of the catheter cannula to the material supply assembly.

[0016] A purging assembly for purging the piping of the feed assembly prior to coating operations;

[0017] A constant temperature air drying assembly is used to air dry the catheter after the coating operation is completed, and to pump clean, constant temperature air toward the catheter.

[0018] The feeding assembly includes a storage tank, a diaphragm pump, a discharge pipe, a conveying pipe, and a feeding pipe. The storage tank stores coating liquid. The storage tank is connected to the inlet of the diaphragm pump through the discharge pipe. The outlet of the diaphragm pump is connected to the feeding pipe through the conveying pipe. One feeding pipe corresponds to a set of connecting assemblies.

[0019] The connecting components are located on one side of the coating station and multiple sets are provided. The connecting components include a sealing seat, a mating seat, a sealing gasket, a mating gasket, and a connecting tube. The sealing seat is slidably disposed in the direction of approaching or moving away from the fixed plate. The mating seat is disposed on the side of the fixed plate away from the sealing seat. The mating seat is in contact with the bottom side of the fixed plate away from the sealing seat. The mating seat and the sealing seat correspond one-to-one.

[0020] The sealing gasket is fixedly connected to the side of the sealing seat near the fixing plate, and the mating gasket is fixedly connected to the side of the fixing plate near the sealing seat. The mating gasket and the fixing plate correspond one-to-one. The sealing seat can slide towards the fixing plate until the sides of the sealing gasket and the mating gasket abut against each other. The side of the sealing gasket near the mating gasket has a sealing arc groove, and the side of the mating gasket near the sealing gasket has a mating arc groove. The sealing arc groove and the mating arc groove are joined together to form a circular connecting groove. The part of the catheter with a through hole at the bottom is located in the connecting groove and fits against the inner wall of the connecting groove.

[0021] The sealing seat has a first connecting hole for the connecting tube to pass through, and the sealing gasket has a second connecting hole for the connecting tube to enter. The second connecting hole extends through the thickness direction of the sealing gasket and communicates with the sealing arc groove. The orthographic projection of the second connecting hole completely coincides with the orthographic projection of the first connecting hole. The connecting tube is a flexible tube. One end of the connecting tube is connected to the end of the feeding tube away from the conveying tube. The other end of the connecting tube passes through the first connecting hole and then enters the second connecting hole. The connecting tube is interference-fitted with both the first and second connecting holes. The port of the connecting tube that enters the second connecting hole communicates with the through hole of the catheter insertion tube.

[0022] By adopting the above technical solution, when coating the catheter cannula, the operator only needs to fix the catheter cannula onto the conveyor belt using clamps at the loading and unloading station. The conveyor belt drives multiple clamps to rotate cyclically around the loop. When several clamps rotate to the coating station on one side of the conveyor belt width direction and the clamp fixing plate moves to the corresponding connecting component, the conveyor belt stops moving. The connecting component connects and seals the connection between the feeding component and the catheter cannula. Then, the feeding component pumps the coating liquid into the catheter cannula from the through hole at the bottom until the coating liquid overflows from the bottom to the top opening of the catheter cannula. The overflowing coating liquid is absorbed by the accumulator. When the accumulator absorbs a specified amount of coating liquid, the pressure inside the accumulator reaches a specified level. At a constant pressure value, the accumulator delivers the coating liquid from the top opening of the conduit tube to the feeding assembly. Then, the constant temperature drying assembly dries the coating liquid inside the conduit tube at a constant temperature. After that, the conveyor belt is started, causing the clamp holding the coated conduit tube to rotate to the loading and unloading station. The operator removes the coated conduit tube from the clamp, and then the conduit tube, which is now in the coating station, is automatically coated. The automation level is high, achieving automatic coating. Moreover, the coating liquid is circulated in a sealed and clean pipeline, which not only saves the use of coating liquid, saves resources and costs, and protects the cleanliness of the coating liquid, but also improves the uniformity and coating effect of the coating by the coating liquid passing through the inner wall of the conduit tube twice evenly.

[0023] Preferably, the clamp includes a fixed plate and a clamping assembly. The fixed plate is vertically arranged, and its top end is connected to a conveyor belt via the fixed assembly. The clamping assembly is arranged in several groups along the width direction of the fixed plate. The clamping assembly includes multiple elastic claws arrayed along the length direction of the fixed plate. Each elastic claw includes a claw body and claw hands. The claw body is connected to the fixed plate, and the claw hands are located at both ends of the fixed plate in the lateral direction. The claw hands are located on both sides of the catheter cannula in the radial direction. Each side of the catheter cannula in the radial direction corresponds to two claw hands, and the two claw hands on each side of the catheter cannula are located at both ends of the fixed plate in the longitudinal direction. A V-shaped groove is formed on one side of the thickness direction of two adjacent claw hands facing the other side in the thickness direction. The V-shaped groove penetrates the side of the two claw hands that are close to each other. A receiving groove for clamping the catheter cannula is formed between the inner walls of two adjacent V-shaped grooves. The maximum width of the receiving groove is less than the outer diameter of the catheter cannula. The catheter cannula is interference-fitted with the corresponding two claw hands.

[0024] By adopting the above technical solution, when fixing the catheter, the catheter can be simply clamped in the receiving groove in the horizontal direction, which is convenient to operate. The V-shaped groove is designed to limit the position of the catheter, improve the positioning and fixation of the catheter, and improve the stability of the catheter being clamped.

[0025] Preferably, a return pipe is provided between the feed pipe and the storage tank, a first electromagnetic reversing valve is provided on the feed pipe between the return pipe and the diaphragm pump, a second electromagnetic reversing valve is provided on the return pipe, and a third electromagnetic reversing valve is provided on each feed pipe.

[0026] A liquid level detection sensor is installed on the connecting pipe, a pressure detection sensor is installed at the outlet end of the accumulator, and an operation panel and a timer are installed on the protective box. The liquid level detection sensor, the pressure detection sensor, and the timer are all electrically connected to the operation panel.

[0027] When the coating liquid is pumped from the storage tank into the conduit tube, the first solenoid reversing valve opens, the second solenoid reversing valve closes, and the third solenoid reversing valve opens. At this time, the coating liquid flows from the storage tank to the accumulator.

[0028] The liquid level detection sensor is used to detect whether the coating liquid overflows from the catheter insertion tube and enters the connecting tube;

[0029] The pressure detection sensor is used to detect the pressure value of the accumulator. When the liquid level detection sensor detects that the coating liquid has entered the connecting pipe and the pressure value of the accumulator has reached the specified pressure value, the accumulator enters the pressure holding state, and the diaphragm pump is turned off at this time.

[0030] The timer is used to control the pressure holding time in the accumulator. When the accumulator reaches the specified pressure holding time, the third electromagnetic reversing valve reverses, the second electromagnetic reversing valve opens, and the first electromagnetic reversing valve closes. At this time, the coating liquid flows from the accumulator to the storage tank.

[0031] By adopting the above technical solution, the diaphragm pump pumps the coating liquid from the storage tank through the discharge pipe, delivery pipe, supply pipe, and connecting pipe into the conduit tube. At this time, the sealing seat moves towards the mating seat until the sealing gasket and the mating gasket abut against each other, thereby sealing the bottom through hole of the conduit tube. This allows the coating liquid to flow smoothly from bottom to top without leakage until it enters the accumulator. At this time, the first solenoid reversing valve opens, the second solenoid reversing valve closes, and the third solenoid reversing valve opens. When the liquid level detection sensor detects that the coating liquid has entered the connecting pipe and the pressure value of the accumulator reaches the specified pressure value, the accumulator enters the pressure holding state. At this time, the diaphragm pump closes. After the accumulator reaches the specified pressure holding time, the third solenoid reversing valve reverses, the second solenoid reversing valve opens, and the first solenoid reversing valve closes. At this time, the coating liquid flows from the accumulator to the storage tank, realizing the recycling of the coating liquid.

[0032] Preferably, the fixing plate is provided with a connecting tube, which is inserted into the opening at the top of the catheter tube. The top of the fixing plate is provided with an auxiliary claw for clamping the connecting tube. The structure of the auxiliary claw is the same as that of the elastic claw. The connecting tube is provided with an annular positioning step. The bottom surface of the positioning step abuts against the top surface of the catheter tube, and the top surface of the positioning step abuts against the bottom surface of the claw of the auxiliary claw located below.

[0033] The top of the fixed plate is also provided with a limiting plate, which is located above the auxiliary claw. The side of the limiting plate away from the fixed plate is provided with a clearance arc groove. The inner wall of the clearance arc groove fits against the outer wall of the connecting pipe. The connecting pipe is also provided with an annular limiting step. The bottom surface of the limiting step abuts against the top surface of the upper claw of the auxiliary claw, and the top surface of the limiting step abuts against the bottom surface of the limiting plate.

[0034] The portion of the connecting pipe and the connecting tube that is inserted is provided with an annular sealing step. The outer circumferential surface of the sealing step is inclined. The outer diameter of the sealing step near the accumulator is smaller than the outer diameter of the sealing step away from the accumulator.

[0035] The top end of the connecting pipe is connected to the inlet end of the accumulator via a connecting pipe, and the bottom end of the connecting pipe is inserted into the portion of the connecting pipe that extends above the limit plate.

[0036] By adopting the above technical solution, the sealing performance of the connection between the accumulator and the catheter cannula is improved.

[0037] Preferably, a support frame is provided inside the protective box, and a support ring plate is provided on the top surface of the support frame, and the guide rail is fixed to the support ring plate;

[0038] The fixing component includes a fixing frame and a connector. One end of the fixing frame and the side of the fixing plate opposite to the catheter insertion tube are fixedly connected. A transition plate extends from the bottom of the fixing frame toward the direction close to the conveyor belt. A connecting plate is fixedly connected to the bottom surface of the transition plate. Both the connecting plate and the transition plate are horizontally arranged. An installation block is fixedly connected to the end of the connecting plate near the conveyor belt.

[0039] The connector includes a C-shaped frame and a waist-shaped plate. The middle section of the C-shaped frame is fixedly connected by bolts and a conveyor belt. A mounting plate is provided at the bottom of the C-shaped frame. Both ends of the mounting plate are fixedly connected to both ends of the C-shaped frame. A connecting shaft is provided on the top surface of the mounting plate. One end of the waist-shaped plate is fixedly connected to the top surface of the connecting shaft, and the other end of the waist-shaped plate is fixedly connected to the top surface of the mounting block.

[0040] The guiding assembly includes a guide wheel, which is rotatably connected to the bottom surface of the connecting plate. The guide wheel is located on both sides of the track body of the guide rail in the width direction. V-shaped guide protrusions are provided on both sides of the track body of the guide rail in the width direction. A V-shaped guide groove is provided on the peripheral side wall of the guide wheel, and the guide protrusion is engaged in the guide groove.

[0041] By adopting the above technical solutions, the protective enclosure provides a clean coating space for the coating process, thereby improving the cleanliness of the coating.

[0042] The fixing assembly secures the fixture's fixing plate to the conveyor belt, and the guide wheel moves along the guide rail with the conveyor belt, improving the stability of the fixture's movement.

[0043] Preferably, the drive assembly includes a drive motor, a drive shaft, a bevel gear set, a drive wheel, and a driven wheel. The output shaft of the drive motor is connected to the drive shaft via the bevel gear set. The bevel gear set includes a first bevel gear and a second bevel gear. The first bevel gear is coaxially connected to the output shaft of the drive motor, and the second bevel gear is coaxially connected to the drive shaft. The first bevel gear meshes with the second bevel gear. The top end of the drive shaft passes through the drive wheel and is coaxially connected to it. The driven wheel is rotatably connected to a support frame. The conveyor belt is simultaneously fitted onto both the drive wheel and the driven wheel. The drive wheel and the driven wheel cooperate to tension the conveyor belt.

[0044] By adopting the above technical solution, the output shaft of the drive motor rotates, which drives the first bevel gear to rotate, which in turn drives the second bevel gear to rotate, which in turn drives the drive shaft to rotate, which in turn drives the drive wheel to rotate. The drive wheel and the driven wheel work together to tension the conveyor belt, thereby the drive wheel rotates and drives the conveyor belt to rotate.

[0045] Preferably, a locking assembly is provided on the outer sidewalls on both sides of the support ring plate in the width direction. The locking assembly is used to lock the fixing plate. The locking assembly includes a drive cylinder, a drive plate, a drive rod, and a locking plate. The drive cylinder is disposed on the support ring plate. The cylinder body of the drive cylinder is rotatably connected to the support ring plate. The piston rod of the drive cylinder is rotatably connected to the bottom end of the drive plate. The top end of the drive plate is fixedly connected to the drive rod. The drive plate swings about the central axis of the drive rod. The drive rod is rotatably disposed on the sidewall of the support ring plate through a bearing seat. The bottom end of the locking plate is fixedly connected to the drive rod. When the drive rod rotates, it drives the locking plate to swing.

[0046] The top surface of the locking plate is provided with a locking protrusion, the bottom surface of the fixing frame near the fixing plate is provided with a locking block, the side of the locking block near the fixing plate is provided with a locking groove, and the locking protrusion swings with the locking plate to enter the locking groove or disengage from the locking groove.

[0047] When the piston rod of the drive cylinder extends, the bottom end of the drive plate swings away from the support ring plate, causing the top end of the locking plate to swing towards the support ring plate until the locking protrusion enters the locking groove.

[0048] When the piston rod of the drive cylinder retracts, the bottom end of the drive plate swings toward the support ring plate, causing the top end of the locking plate to swing away from the support ring plate until the locking protrusion disengages from the locking groove.

[0049] By adopting the above technical solution, after several fixtures move to the coating station and correspond one by one with the connecting components, the fixing plate is locked by the locking component, so that the fixtures are stably located in the coating position.

[0050] When locking is required, the piston rod of the drive cylinder extends, and the bottom end of the drive plate swings away from the support ring plate, causing the top end of the locking plate to swing towards the support ring plate until the locking protrusion enters the locking groove.

[0051] When unlocking is required, the piston rod of the drive cylinder retracts, causing the bottom end of the drive plate to swing towards the support ring plate, which in turn causes the top end of the locking plate to swing away from the support ring plate until the locking protrusion disengages from the locking groove.

[0052] Preferably, the purging assembly is disposed above the circulating conveying mechanism and close to the storage tank. The purging assembly includes a purging air pipe and a purging air pump. The outlet ends of the purging air pipe and the purging air pump are connected. The purging air pipe is connected to an external ion air source through the purging air pump.

[0053] By adopting the above technical solution, the pipeline near the storage tank is purged before the material feeding component supplies the material, thereby further improving the cleanliness of the coating.

[0054] Preferably, the constant temperature air drying component is disposed above the circulating conveying mechanism, and the constant temperature mechanism is offset from the material storage component. The constant temperature air drying component includes an air drying pipe and an air drying pump. The outlet end of the air drying pipe is connected to the air drying pump, and the air drying pipe is connected to an external constant temperature air source through the air drying pump.

[0055] By adopting the above technical solutions, the efficiency of air drying of the coating solution after catheter insertion and coating is improved.

[0056] In summary, this application includes the following beneficial technical effects:

[0057] With a high degree of automation, it achieves automatic coating, and the coating solution is circulated in a sealed and clean pipeline. This not only saves on the use of coating solution, conserves resources and costs, and protects the cleanliness of the coating solution, but also improves the uniformity and effect of the coating by ensuring that the coating solution passes through the inner wall of the conduit tube twice. Attached Figure Description

[0058] Figure 1 This is a schematic diagram of the overall structure of a special device for coating catheters in an embodiment of this application.

[0059] Figure 2 This is a structural schematic diagram used to illustrate the fixed component in the embodiments of this application.

[0060] Figure 3 yes Figure 1 A magnified structural diagram of point A in the middle.

[0061] Figure 4 This is a structural schematic diagram used to illustrate the locking component in an embodiment of this application.

[0062] Figure 5 This is a schematic diagram illustrating the structure of the driving component in an embodiment of this application.

[0063] Figure 6 This is a schematic diagram illustrating the structure of the feeding assembly in an embodiment of this application.

[0064] Figure 7 This is a structural schematic diagram used to illustrate the connecting components in the embodiments of this application.

[0065] Figure 8 yes Figure 1 A magnified structural diagram at point B in the middle.

[0066] Explanation of reference numerals in the attached drawings: 1. Protective housing; 11. Operation panel; 12. Support frame; 13. Support ring plate; 14. Support platform; 141. Support rod; 2. Circulating conveyor mechanism; 21. Conveyor belt; 22. Drive assembly; 221. Drive motor; 222. Drive shaft; 223. Driving wheel; 224. Driven wheel; 225. First bevel gear; 226. Second bevel gear; 23. Guide rail; 231. Guide protrusion; 24. Fixing assembly; 241. Fixing frame; 242. Connector; 2421. C-shaped frame; 2422. Waist plate; 2423. Mounting plate; 2424. Connecting shaft; 2 43. Transition plate; 244. Connecting plate; 245. Mounting block; 246. Connecting pipe; 2461. Positioning step; 2462. Limiting step; 2463. Sealing step; 247. Auxiliary claw; 25. Clamp; 251. Fixing plate; 2511. Limiting plate; 252. Elastic claw; 2521. Claw body; 2522. Claw hand; 2523. V-groove; 26. Guide wheel; 261. Guide groove; 27. Support rod; 28. Locking assembly; 281. Drive cylinder; 2811. First fixing block; 2812. Second fixing block; 282. Drive plate; 283. Drive 2831, Bearing seat; 284, Locking plate; 285, Locking boss; 286, Locking block; 287, Locking groove; 3, Feeding assembly; 31, Liquid storage tank; 32, Diaphragm pump; 33, Discharge pipe; 34, Conveying pipe; 35, Feeding pipe; 36, Pressure stabilizer; 4, Connecting assembly; 41, Sealing seat; 411, First connecting hole; 42, Mating seat; 43, Sealing gasket; 431, Sealing arc groove; 432, Second connecting hole; 44, Mating gasket; 441, Mating arc groove; 45, Connecting pipe; 46, Push cylinder; 5, Material storage assembly; 51, Accumulator; 511, Pressure detector 512. Sensor; 52. Timer; 52. Connecting pipe; 521. Liquid level sensor; 53. Vertical plate one; 54. Lifting cylinder one; 55. Connector one; 56. Return pipe; 57. First electromagnetic reversing valve; 58. Second electromagnetic reversing valve; 59. Third electromagnetic reversing valve; 6. Purge assembly; 61. Purge air pipe; 62. Purge air pump; 63. Vertical plate two; 64. Lifting cylinder two; 65. Connector two; 7. Constant temperature air drying assembly; 71. Air drying air pipe; 72. Air drying air pump; 73. Vertical plate three; 74. Lifting cylinder three; 75. Connector three; 8. Conduit tube; 81. Through hole. Detailed Implementation

[0067] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0068] This application discloses a special device for coating catheters during insertion.

[0069] Reference Figure 1The specialized equipment for coating catheters includes a protective housing 1, which houses a circulating conveying mechanism 2 and an automatic coating mechanism. The protective housing 1 is equipped with doors on all four sides; rotating and opening these doors allows operation inside the protective housing. An operation panel 11 is located on the outer wall of the protective housing 1, facilitating the control of electrical components. The protective housing 1 provides a clean coating space, improving the cleanliness of the coating.

[0070] Reference Figure 1 The circulating conveying mechanism 2 includes a conveyor belt 21, a drive assembly 22, and a guide rail 23. The conveyor belt 21 rotates in a ring, and multiple clamps 25 for holding and fixing the catheter insertion tube 8 are fixed on the conveyor belt 21 by a fixing assembly 24. One side of the conveyor belt 21 in the width direction is a loading and unloading station 211, and the other side of the conveyor belt 21 in the width direction is a coating station 212. The drive assembly 22 is used to drive the conveyor belt 21 to rotate. The guide rail 23 is used to guide the clamps 25 to move with the conveyor belt 21, and the shape formed by the guide rail 23 is adapted to the shape formed by the conveyor belt 21.

[0071] Reference Figure 1-2 The protective housing 1 contains a support frame 12, and a support ring plate 13 is provided on the top surface of the support frame 12. The shape formed by the support ring plate 13 is adapted to the shape formed by the conveyor belt 21. The guide rail 23 is fixed on the support ring plate 13, and the clamp 25 is slidably connected to the guide rail 23 through the guide assembly and moves along the guide rail 23. A support rod 27 is provided on the top surface of the support frame 12. The support rod 27 is horizontally arranged and located on both sides of the width direction of the support frame 12. The inner side of the conveyor belt 21 is attached to the side of the support rod 27 that is away from it. The support rod 27 is used to assist in tensioning the conveyor belt 21 and provide horizontal support force to the conveyor belt 21.

[0072] Reference Figure 1-3The clamp 25 includes a fixed plate 251 and a clamping assembly. The fixed plate 251 is vertically arranged. The top end of the fixed plate 251 is connected to the conveyor belt 21 through the fixed assembly 24. Several sets of clamping assemblies are arranged along the width direction of the fixed plate 251. In this embodiment, two sets of clamping assemblies are arranged along the width direction of the fixed plate 251. Each clamping assembly includes multiple elastic claws 252 arrayed along the length of the fixed plate 251. Each elastic claw 252 includes a claw body 2521 and claw hands 2522. The claw body 2521 is connected to the fixed plate 251. The claw hands 2522 are located at both ends of the fixed plate 251 in the lateral direction and on both sides of the catheter tube 8 in the radial direction. Each side of the catheter tube 8 in the radial direction corresponds to two claw hands 2522, and the two claw hands 2522 on each side of the catheter tube 8 are located at both ends of the fixed plate 251 in the longitudinal direction. A V-shaped groove 2523 is formed on one side of the thickness direction of two adjacent claw hands 2522 facing the other side in the thickness direction. The V-shaped groove 2523 penetrates the side of the two claw hands 2522 that are close to each other. A receiving groove for the catheter tube 8 is formed between the inner walls of two adjacent V-shaped grooves 2523. The maximum width of the receiving groove is less than the outer diameter of the catheter tube 8. The catheter tube 8 is interference-fitted with the corresponding two claw hands 2522.

[0073] When fixing the catheter 8, simply place the catheter 8 horizontally into the receiving groove. The operation is convenient. The V-groove 2523 facilitates the limiting of the catheter 8, improves the positioning and fixing of the catheter 8, and enhances the stability of the catheter 8 being clamped.

[0074] Reference Figure 1-2 The fixing component 24 includes a fixing frame 241 and a connector 242. One end of the fixing frame 241 is fixedly connected to the side of the fixing plate 251 facing away from the catheter insertion tube 8. A transition plate 243 extends from the bottom of the fixing frame 241 toward the direction close to the conveyor belt 21. A connecting plate 244 is fixedly connected to the bottom surface of the transition plate 243. Both the connecting plate 244 and the transition plate 243 are horizontally arranged. An installation block 245 is fixedly connected to the end of the connecting plate 244 near the conveyor belt 21.

[0075] The connector 242 includes a C-shaped frame 2421 and a waist-shaped plate 2422. The middle section of the C-shaped frame 2421 is fixedly connected to the conveyor belt 21 by bolts. A mounting plate 2423 is provided at the bottom of the C-shaped frame 2421. Both ends of the mounting plate 2423 are fixedly connected to both ends of the C-shaped frame 2421. A connecting shaft 2424 is provided on the top surface of the mounting plate 2423. One end of the waist-shaped plate 2422 is fixedly connected to the top surface of the connecting shaft 2424, and the other end of the waist-shaped plate 2422 is fixedly connected to the top surface of the mounting block 245.

[0076] Reference Figure 1-4The guiding assembly includes guide wheels 26, which are rotatably connected to the bottom surface of the connecting plate 244. The guide wheels 26 are located on both sides of the guide rail 23 in the width direction. V-shaped guide protrusions 231 are provided on both sides of the guide rail 23 in the width direction. V-shaped guide grooves 261 are formed on the peripheral sidewalls of the guide wheels 26, and the guide protrusions 231 are engaged within the guide grooves 261. The guide wheels 26 move along the guide rail 23 with the conveyor belt 21, improving the stability of the clamp 25's movement.

[0077] Reference Figure 5 The drive assembly 22 includes a drive motor 221, a drive shaft 222, a bevel gear set, a drive wheel 223, and a driven wheel 224. The output shaft of the drive motor 221 is connected to the drive shaft 222 through the bevel gear set. The bevel gear set includes a first bevel gear 225 and a second bevel gear 226. The first bevel gear 225 is coaxially connected to the output shaft of the drive motor 221, and the second bevel gear 226 is coaxially connected to the drive shaft 222. The first bevel gear 225 and the second bevel gear 226 mesh. The top end of the drive shaft 222 passes through the drive wheel 223 and is coaxially connected to the drive wheel 223. The driven wheel 224 is rotatably connected to the support frame 12. The conveyor belt 21 is simultaneously fitted onto the drive wheel 223 and the driven wheel 224. The drive wheel 223 and the driven wheel 224 cooperate to tension the conveyor belt 21.

[0078] The output shaft of the drive motor 221 rotates, which drives the first bevel gear to rotate, which in turn drives the second bevel gear to rotate, which in turn drives the drive shaft 222 to rotate, which in turn drives the drive wheel 223 to rotate. The drive wheel 223 and the driven wheel 224 work together to tension the conveyor belt 21, so that the rotation of the drive wheel 223 drives the conveyor belt 21 to rotate.

[0079] Reference Figure 4 Locking components 28 are provided on the outer side walls of both sides of the support ring plate 13 in the width direction. The locking components 28 are used to lock the fixing plate 251. The locking components 28 include a drive cylinder 281, a drive plate 282, a drive rod 283, and a locking plate 284. The drive cylinder 281 is disposed on the support ring plate 13. The cylinder body of the drive cylinder 281 is rotatably connected to the support ring plate 13. A first fixing block 2811 is connected to the tail of the cylinder body of the drive cylinder 281. A second fixing block 2812 is connected to the bottom surface of the support ring plate 13. The first fixing block 2811 is located on both sides of the second fixing block 2812 and is rotatably connected to the second fixing block 2812. The piston rod of the drive cylinder 281 is rotatably connected to the bottom end of the drive plate 282, and the top end of the drive plate 282 is fixedly connected to the drive rod 283. The drive plate 282 swings about the central axis of the drive rod 283. The drive rod 283 is rotatably mounted on the side wall of the support ring plate 13 through the bearing seat 2831. The bottom end of the locking plate 284 is fixedly connected to the drive rod 283. When the drive rod 283 rotates, it drives the locking plate 284 to swing.

[0080] The top surface of the locking plate 284 is provided with a locking boss 285, and the bottom surface of the fixing frame 241 near the fixing plate 251 is provided with a locking block 286. The side of the locking block 286 near the fixing plate 251 is provided with a locking groove 287. The locking boss 285 swings with the locking plate 284 to enter the locking groove 287 or disengage from the locking groove 287.

[0081] When the piston rod of the drive cylinder 281 extends, it causes the bottom end of the drive plate 282 to swing away from the support ring plate 13, which in turn causes the top end of the locking plate 284 to swing towards the support ring plate 13 until the locking protrusion enters the locking groove 287. When the piston rod of the drive cylinder 281 retracts, it causes the bottom end of the drive plate 282 to swing towards the support ring plate 13, which in turn causes the top end of the locking plate 284 to swing away from the support ring plate 13 until the locking protrusion disengages from the locking groove 287.

[0082] Once the clamps 25 move to the coating station 212 and correspond one-to-one with the connecting components 4, the fixing plate 251 is locked by the locking component 28, so that the clamps 25 are stably positioned in the coating position. When locking is required, the piston rod of the drive cylinder 281 extends, and the bottom end of the drive plate 282 swings away from the support ring plate 13, causing the top end of the locking plate 284 to swing towards the support ring plate 13 until the locking protrusion enters the locking groove 287; when unlocking is required, the piston rod of the drive cylinder 281 retracts, causing the bottom end of the drive plate 282 to swing towards the support ring plate 13, causing the top end of the locking plate 284 to swing away from the support ring plate 13 until the locking protrusion disengages from the locking groove 287.

[0083] Reference Figure 1 The automatic coating mechanism includes a feeding component 3, a connecting component 4, a material storage component 5, a blowing component 6, and a constant temperature drying component 7.

[0084] Reference Figure 1 and Figure 6 The bottom of the catheter tube 8 is provided with a through hole 81 for the coating liquid to enter the interior of the catheter tube 8. The feeding assembly 3 pumps the coating liquid into the interior of the catheter tube 8 through the through hole 81 at the bottom of the catheter tube 8. The feeding assembly 3 includes a storage tank 31, a diaphragm pump 32, a discharge pipe 33, a conveying pipe 34, and a feeding pipe 35. The storage tank 31 stores the coating liquid. The storage tank 31 is connected to the inlet of the diaphragm pump 32 through the discharge pipe 33. The outlet of the diaphragm pump 32 is connected to the feeding pipe 35 through the conveying pipe 34. One feeding pipe 35 corresponds to one set of connecting assemblies 4. A pressure regulator 36 is provided on the end of the conveying pipe 34 near the diaphragm pump 32 to stabilize the pressure of the pipeline.

[0085] Reference Figure 1 and Figure 7The connecting component 4 is used to connect and seal the connection between the feeding component 3 and the conduit tube 8. Multiple sets of connecting components 4 are located on one side of the coating station 212; in this embodiment, three sets of connecting components 4 are provided. The connecting component 4 includes a sealing seat 41, a mating seat 42, a sealing gasket 43, a mating gasket 44, and a connecting tube 45. The sealing seat 41 is slidably disposed towards or away from the fixed plate 251 by a pushing cylinder 46. The piston rod of the pushing cylinder 46 is connected to the side of the sealing seat 41 away from the mating seat 42. The mating seat 42 is disposed on the side of the fixed plate 251 away from the sealing seat 41, and the mating seat 42 is in contact with the bottom side of the fixed plate 251 away from the sealing seat 41. The mating seat 42 and the sealing seat 41 correspond one-to-one.

[0086] A sealing gasket 43 is fixedly connected to the side of the sealing seat 41 near the fixing plate 251, and a mating gasket 44 is fixedly connected to the side of the fixing plate 251 near the sealing seat 41. The mating gasket 44 corresponds one-to-one with the fixing plate 251. Both the sealing gasket 43 and the mating gasket 44 are made of silicone material. The sealing seat 41 can slide towards the fixing plate 251 until the sides of the sealing gasket 43 and the mating gasket 44 are close together and press against each other. A sealing arc groove 431 is formed on the side of the sealing gasket 43 near the mating gasket 44, and a mating arc groove 441 is formed on the side of the mating gasket 44 near the sealing gasket 43. The sealing arc groove 431 and the mating arc groove 441, when joined together, form a circular connecting groove. The portion of the catheter tube 8 with the through hole 81 at its bottom is located within the connecting groove and fits against the inner wall of the connecting groove.

[0087] The sealing seat 41 has a first connecting hole 411 through which the connecting tube 45 passes, and the sealing gasket 43 has a second connecting hole 432 through which the connecting tube 45 passes. The second connecting hole 432 extends through the thickness direction of the sealing gasket 43 and communicates with the sealing arc groove 431. The orthographic projection of the second connecting hole 432 completely coincides with the orthographic projection of the first connecting hole 411. The connecting tube 45 is a flexible tube. One end of the connecting tube 45 is connected to the end of the feeding tube 35 away from the conveying tube 34. The other end of the connecting tube 45 passes through the first connecting hole 411 and then enters the second connecting hole 432. The connecting tube 45 is press-fitted with both the first connecting hole 411 and the second connecting hole 432. The port of the connecting tube 45 that enters the second connecting hole 432 communicates with the through hole 81 of the catheter insertion tube 8.

[0088] Reference Figure 8The material storage assembly 5 is located at the opening at the top of the catheter tube 8 and is used to absorb the coating liquid overflowing from the top of the catheter tube 8. The material storage assembly 5 includes an accumulator 51 and a connecting pipe 52. The accumulator 51 is connected to the opening at the top of the catheter tube 8 through the connecting pipe 52. The material storage assembly 5 is raised and lowered. A support platform 14 is provided inside the protective box 1. The support platform 14 is located above the conveyor belt 21 and is arranged along the length direction of the protective box 1. Support rods 141 are vertically arranged at both ends of the support platform 14 near the length direction. The support rods 141 are located in the space in the middle of the width direction of the conveyor belt 21. The end of the support rod 141 away from the support platform 14 is fixedly connected to the inner bottom wall of the protective box 1. A vertical plate 53 is fixed on the top surface of the support platform 14. A lifting cylinder 54 is provided on the vertical plate 53. The piston rod of the lifting cylinder 54 is fixedly connected to the bottom of the vertical plate 53. The cylinder body of the lifting cylinder 54 is fixedly connected to the connecting pipe 52 through a connector 55. When the amount of coating liquid absorbed by the accumulator 51 reaches the specified amount, the pressure inside the accumulator 51 reaches the specified pressure value. At this time, the accumulator 51 delivers the coating liquid to the feeding assembly 3 through the top opening of the conduit tube 8.

[0089] Reference Figure 1 and Figure 6 A return pipe 56 is provided between the feed pipe 34 and the storage tank 31. A first electromagnetic reversing valve 57 is provided on the feed pipe 34 between the return pipe 56 and the diaphragm pump 32. A second electromagnetic reversing valve 58 is provided on the return pipe 56. A third electromagnetic reversing valve 59 is provided on each feed pipe 35.

[0090] Reference Figure 8 A liquid level detection sensor 521 is installed on the connecting pipe 52, a pressure detection sensor 511 is installed at the outlet end of the accumulator 51, and a timer 512 is installed inside the protective housing 1. The liquid level detection sensor 521, the pressure detection sensor 511, and the timer 512 are all electrically connected to the operation panel 11.

[0091] When the coating liquid is pumped from the storage tank into the conduit tube 8, the first electromagnetic reversing valve 57 opens, the second electromagnetic reversing valve 58 closes, and the third electromagnetic reversing valve 59 opens. At this time, the coating liquid flows from the storage tank 31 to the accumulator 51.

[0092] The liquid level sensor 521 is used to detect whether the coating liquid overflows from the catheter insertion tube 8 and enters the connecting tube 52.

[0093] The pressure sensor 511 is used to detect the pressure value of the accumulator 51. When the liquid level sensor 521 detects that the coating liquid has entered the connecting pipe 52 and the pressure value of the accumulator 51 reaches the specified pressure value, the accumulator 51 enters the pressure holding state, and the diaphragm pump 32 is turned off.

[0094] The timer 512 is used to control the pressure holding time in the accumulator 51. When the accumulator 51 reaches the specified pressure holding time, the third solenoid directional valve 59 switches, the second solenoid directional valve 58 opens, and the first solenoid directional valve 57 closes. At this time, the coating liquid flows from the accumulator 51 to the storage tank 31.

[0095] Reference Figure 4 The fixing plate 251 is provided with a connecting tube 246, which is inserted into the opening at the top of the catheter tube 8. The top of the fixing plate 251 is provided with an auxiliary claw 247 for clamping the connecting tube 246. The structure of the auxiliary claw 247 is the same as that of the elastic claw 252. The connecting tube 246 is provided with an annular positioning step 2461. The bottom surface of the positioning step 2461 abuts against the top surface of the catheter tube 8, and the top surface of the positioning step 2461 abuts against the bottom surface of the claw 2522 of the auxiliary claw 247 located below. A limiting plate 2511 is also provided on the top of the fixed plate 251. The limiting plate 2511 is located above the auxiliary claw 247. The side of the limiting plate 2511 away from the fixed plate 251 is provided with a clearance arc groove. The inner wall of the clearance arc groove fits against the outer wall of the connecting pipe 246. The connecting pipe 246 is also provided with an annular limiting step 2462. The bottom surface of the limiting step 2462 abuts against the top surface of the upper claw 2522 of the auxiliary claw 247. The top surface of the limiting step 2462 abuts against the bottom surface of the limiting plate 2511.

[0096] The portion where the connecting tube 246 and the connecting pipe 52 intersect is provided with an annular sealing step 2463. The outer circumferential surface of the sealing step 2463 is inclined, and the outer diameter of the sealing step 2463 near the accumulator 51 is smaller than the outer diameter of the end of the sealing step 2463 away from the accumulator 51. The top end of the connecting tube 246 is connected to the inlet end of the accumulator 51 via the connecting pipe 52, and the bottom end of the connecting pipe 52 is intersected with the portion of the connecting tube 246 that extends above the limiting plate 2511. When the accumulator 51 descends to the point where the connecting pipe 52 and the connecting tube 246 intersect, the sealing performance between the accumulator 51 and the catheter insertion tube 8 is improved.

[0097] The diaphragm pump 32 pumps the coating liquid from the storage tank through the discharge pipe 33, conveying pipe, supply pipe 35, and connecting pipe 45 into the conduit tube 8. At this time, the sealing seat 41 moves towards the mating seat 42 until the sealing gasket 43 and the mating gasket 44 abut against each other, thereby sealing the through hole 81 at the bottom of the conduit tube 8, allowing the coating liquid to flow smoothly from bottom to top without leakage, until the coating liquid enters the accumulator 51. At this time, the first electromagnetic reversing valve 57 opens and the second electromagnetic reversing valve 58 closes. When the third solenoid directional valve 59 is closed and the liquid level sensor 521 detects that the coating liquid has entered the connecting pipe 52 and the pressure value of the accumulator 51 has reached the specified pressure value, the accumulator 51 enters the pressure holding state. At this time, the diaphragm pump 32 is closed. After the accumulator 51 reaches the specified pressure holding time, the third solenoid directional valve 59 is reversed, the second solenoid directional valve 58 is opened, and the first solenoid directional valve 57 is closed. At this time, the coating liquid flows from the accumulator 51 to the storage tank 31, realizing the recycling of the coating liquid.

[0098] Reference Figure 8 The purging assembly 6 is used to purge the pipeline of the feeding assembly 3 before coating operations. The purging assembly 6 is vertically mounted above the circulating conveying mechanism 2, and is positioned near the storage tank. The purging assembly 6 includes a purging air pipe 61 and a purging air pump 62. The outlet end of the purging air pipe 61 and the purging air pump 62 are connected. The purging air pipe 61 is connected to an external ion air source via the purging air pump 62. A second vertical plate 63 is fixed on the support platform 14. A second lifting cylinder 64 is mounted on the second vertical plate 63. The piston rod of the second lifting cylinder 64 is fixedly connected to the bottom of the second vertical plate 63. The cylinder body of the second lifting cylinder 64 is fixedly connected to the purging air pipe 61 via a second connector 65. When the piston rod of the second lifting cylinder 64 extends, it drives the purging assembly 6 to rise; when the piston rod of the second lifting cylinder 64 descends, it drives the purging assembly 6 to descend, thereby reducing the distance between the purging air pipe 61 and the pipeline of the feeding assembly 3. Before feeding material from the feeding assembly 3, the pipeline near the storage tank is purged to further improve the cleanliness of the coating.

[0099] Reference Figure 8The constant temperature air drying assembly 7 is used to dry the conduit tube 8 after the coating operation is completed by pumping clean, constant temperature air toward the conduit tube 8. The constant temperature air drying assembly 7 is set above the circulating conveying mechanism 2 and is offset from the material storage assembly 5. The constant temperature air drying assembly 7 includes a drying air pipe 71 and a drying air pump 72. The outlet end of the drying air pump 72 is connected to the drying air pipe 71. The drying air pipe 71 is connected to a constant temperature air source through the drying air pump 72 to improve the drying efficiency of the coating liquid after coating the conduit tube 8. A vertical plate 3 73 is fixed on the support platform 14. A lifting cylinder 3 74 is set on the vertical plate 3 73. The piston rod of the lifting cylinder 3 74 is fixedly connected to the bottom of the vertical plate 2 63. The cylinder body of the lifting cylinder 3 74 is fixedly connected to the drying air pipe 71 through a connector 3 75. When the piston rod of the lifting cylinder 74 extends, it drives the constant temperature drying assembly 7 to rise. When the piston rod of the lifting cylinder 74 descends, it drives the blowing assembly 6 to descend to reduce the distance between the drying air pipe 71 and the conduit tube 8. When the coating is completed, the conveyor belt 21 carries the conduit tube 8 to the loading and unloading station 211. During this process, the constant temperature drying assembly 7 dries the conduit tube 8 at a constant temperature.

[0100] The implementation principle of a special device for coating catheters in this application is as follows:

[0101] When coating is required on the conduit tube 8, the operator only needs to fix the conduit tube 8 onto the conveyor belt 21 using clamps 25 at the loading / unloading station 211. The conveyor belt 21 drives multiple clamps 25 to rotate cyclically around the loop. When several clamps 25 rotate to the coating station 212 on one side of the width direction of the conveyor belt 21 and the fixing plate 251 of the clamp 25 moves to the corresponding connecting component 4, the conveyor belt 21 stops moving. The connecting component 4 connects and seals the connection between the feeding component 3 and the conduit tube 8. Then, the coating liquid is pumped into the conduit tube 8 from the through hole 81 at the bottom of the conduit tube 8 through the feeding component 3 until the coating liquid overflows from the bottom to the top opening of the conduit tube 8. The overflowing coating liquid is absorbed by the accumulator component 5. When the coating liquid absorbed by the accumulator 51 reaches the specified amount, the pressure inside the accumulator 51 is released. When the pressure reaches the specified value, the accumulator 51 delivers the coating liquid from the top opening of the conduit tube 8 to the feeding assembly 3. Then, the constant temperature drying assembly 7 dries the coating liquid in the conduit tube 8 at a constant temperature. After that, the conveyor belt 21 is started, so that the clamp 25 holding the coated conduit tube 8 rotates with the conveyor belt 21 to the loading and unloading station 211. The operator removes the coated conduit tube 8 from the clamp 25, and then the conduit tube 8, which is now located at the coating station 212, can be automatically coated. The degree of automation is high, realizing automatic coating. Moreover, the coating liquid is circulated in a sealed and clean pipeline, which not only saves the use of coating liquid, saves resources and costs, and protects the cleanliness of the coating liquid, but also improves the uniformity and coating effect of the coating liquid by passing through the inner wall of the conduit tube 8 evenly twice.

[0102] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A catheterization tube coating film dedicated device characterized by comprising: It includes a protective housing (1), and the protective housing (1) is equipped with a circulating conveying mechanism (2) and an automatic coating mechanism; The circulating conveying mechanism (2) includes: The conveyor belt (21) rotates around a ring, and multiple clamps (25) for clamping and fixing the catheter insertion tube (8) are fixed on the conveyor belt (21) by a fixing component (24); one side of the width direction of the conveyor belt (21) is a loading and unloading station, and the other side of the width direction of the conveyor belt (21) is a coating station. A drive assembly (22) is used to drive the conveyor belt (21) to rotate; The guide rail (23) is used to guide the clamp (25) to move with the conveyor belt (21). The shape formed by the guide rail (23) is adapted to the shape formed by the conveyor belt (21). The clamp (25) is slidably connected to the guide rail (23) through the guide assembly and moves along the guide rail (23). The automatic coating mechanism includes: The feeding assembly (3) has a through hole (81) at the bottom of the catheter (8) for the coating liquid to enter the inside of the catheter (8). The feeding assembly (3) pumps the coating liquid into the inside of the catheter (8) from the through hole (81) at the bottom of the catheter (8). Connecting component (4) is used to connect and seal the connection between the feeding component (3) and the catheter (8); The material storage assembly (5) is located at the opening at the top of the catheter (8) and is used to absorb the coating liquid overflowing from the top of the catheter (8). The material storage assembly (5) includes an accumulator (51) and a connecting pipe (52). The accumulator (51) is connected to the top opening of the catheter (8) through the connecting pipe (52). When the coating liquid absorbed by the accumulator (51) reaches a specified amount, the pressure inside the accumulator (51) reaches a specified pressure value. At this time, the accumulator (51) transports the coating liquid from the top opening of the catheter (8) to the material supply assembly (3). A purging assembly (6) is used to purge the piping of the feed assembly (3) before the coating operation; The constant temperature air drying assembly (7) is used to air dry the catheter (8) after the coating operation is completed, and pumps clean constant temperature air toward the catheter (8); The feeding assembly (3) includes a storage tank (31), a diaphragm pump (32), a discharge pipe (33), a conveying pipe (34), and a feeding pipe (35). The storage tank (31) stores a coating liquid. The storage tank (31) is connected to the inlet of the diaphragm pump (32) through the discharge pipe (33). The outlet of the diaphragm pump (32) is connected to the feeding pipe (35) through the conveying pipe (34). One feeding pipe (35) corresponds to a set of connecting assemblies (4). The connecting assembly (4) is located on one side of the coating station and multiple sets are provided. The connecting assembly (4) includes a sealing seat (41), a mating seat (42), a sealing gasket (43), a mating gasket (44), and a connecting tube (45). The sealing seat (41) is slidably disposed in the direction of approaching or away from the fixing plate (251). The mating seat (42) is disposed on the side of the fixing plate (251) away from the sealing seat (41). The mating seat (42) is attached to the bottom side of the fixing plate (251) away from the sealing seat (41). The mating seat (42) and the sealing seat (41) correspond one to one. The sealing gasket (43) is fixedly connected to the side of the sealing seat (41) near the fixing plate (251), and the mating gasket (44) is fixedly connected to the side of the fixing plate (251) near the sealing seat (41). The mating gasket (44) corresponds one-to-one with the fixing plate (251). The sealing seat (41) can slide towards the fixing plate (251) until the sides of the sealing gasket (43) and the mating gasket (44) are close to each other. The side of the sealing gasket (43) near the mating gasket (44) is provided with a sealing arc groove (431), and the side of the mating gasket (44) near the sealing gasket (43) is provided with a mating arc groove (441). The sealing arc groove (431) and the mating arc groove (441) are joined together to form a circular connecting groove. The part of the catheter insertion tube (8) with a through hole (81) at the bottom is located in the connecting groove and fits against the inner wall of the connecting groove. The sealing seat (41) has a first connecting hole (411) for the connecting tube (45) to pass through, and the sealing gasket (43) has a second connecting hole (432) for the connecting tube (45) to pass through. The second connecting hole (432) penetrates the thickness direction of the sealing gasket (43) and communicates with the sealing arc groove (431). The orthographic projection of the second connecting hole (432) completely coincides with the orthographic projection of the first connecting hole (411). (45) is a flexible tube. One end of the connecting tube (45) is connected to the end of the feeding tube (35) away from the conveying tube (34). The other end of the connecting tube (45) passes through the first connecting hole (411) and then enters the second connecting hole (432). The connecting tube (45) is press-fitted with both the first connecting hole (411) and the second connecting hole (432). The port of the connecting tube (45) that enters the second connecting hole (432) is connected to the through hole (81) of the catheter insertion tube (8).

2. The catheterization tube coating film dedicated apparatus according to claim 1, characterized by: The clamp (25) includes a fixed plate (251) and a clamping assembly. The fixed plate (251) is vertically arranged, and the top end of the fixed plate (251) is connected to the conveyor belt (21) through the fixed assembly (24). The clamping assembly is arranged in several groups along the width direction of the fixed plate (251). The clamping assembly includes multiple elastic jaws (252) arrayed along the length direction of the fixed plate (251). The elastic jaws (252) include jaw bodies (2521) and jaw hands (2522). The jaw bodies (2521) are connected to the fixed plate (251), and the jaw hands (2522) are arranged at both ends of the fixed plate (251) in the lateral direction. The jaw hands (2522) are located in the guide tube. On both sides of the radial direction of the cannula (8), there are two claws (2522) on each side of the radial direction of the cannula (8) and the two claws (2522) on each side of the cannula (8) are located at both ends of the longitudinal direction of the fixing plate (251); a V-shaped groove (2523) is opened on the side of the thickness direction of the two adjacent claws (2522) facing the other side of the thickness direction. The V-shaped groove (2523) penetrates the side of the two claws (2522) that are close to each other. A receiving groove for the cannula (8) to be locked is formed between the inner walls of the two adjacent V-shaped grooves (2523). The maximum width of the receiving groove is less than the outer diameter of the cannula (8). The cannula (8) is interference-fitted with the corresponding two claws (2522).

3. The catheterization tube coating device according to claim 1, wherein: A return pipe (56) is provided between the feed pipe (34) and the storage tank (31). A first electromagnetic reversing valve (57) is provided on the feed pipe (34) between the return pipe (56) and the diaphragm pump (32). A second electromagnetic reversing valve (58) is provided on the return pipe (56). A third electromagnetic reversing valve (59) is provided on each feed pipe (35). A liquid level detection sensor (521) is provided on the connecting pipe (52), a pressure detection sensor (511) is provided at the outlet end of the accumulator (51), and an operation panel (11) and a timer (512) are provided on the protective box (1). The liquid level detection sensor (521), the pressure detection sensor (511), and the timer (512) are all electrically connected to the operation panel (11). When the coating liquid is pumped from the storage tank into the conduit tube (8), the first electromagnetic reversing valve (57) opens, the second electromagnetic reversing valve (58) closes, and the third electromagnetic reversing valve (59) opens. At this time, the coating liquid flows from the storage tank (31) to the accumulator (51). The liquid level detection sensor (521) is used to detect whether the coating liquid overflows from the catheter insertion tube (8) and enters the connecting tube (52); The pressure detection sensor (511) is used to detect the pressure value of the accumulator (51). When the liquid level detection sensor (521) detects that the coating liquid enters the connecting pipe (52) and the pressure value of the accumulator (51) reaches the specified pressure value, the accumulator (51) enters the pressure holding state, and the diaphragm pump (32) is turned off at this time. The timer (512) is used to control the pressure holding time in the accumulator (51). When the accumulator (51) reaches the specified pressure holding time, the third electromagnetic reversing valve (59) reverses, the second electromagnetic reversing valve (58) opens, and the first electromagnetic reversing valve (57) closes. At this time, the coating liquid flows from the accumulator (51) to the storage tank (31).

4. The catheterization tube coating device according to claim 2, wherein: The fixing plate (251) is provided with a connecting tube (246), which is inserted into the opening at the top of the catheter tube (8). The top of the fixing plate (251) is provided with an auxiliary claw (247) for clamping the connecting tube (246). The structure of the auxiliary claw (247) is the same as that of the elastic claw (252). The connecting tube (246) is provided with an annular positioning step (2461). The bottom surface of the positioning step (2461) abuts against the top surface of the catheter tube (8). The top surface of the positioning step (2461) abuts against the bottom surface of the claw (2522) of the auxiliary claw (247) located below. The top of the fixed plate (251) is also provided with a limiting plate (2511), which is located above the auxiliary claw (247). The side of the limiting plate (2511) away from the fixed plate (251) is provided with a clearance arc groove. The inner wall of the clearance arc groove is in contact with the outer wall of the connecting pipe (246). The connecting pipe (246) is also provided with an annular limiting step (2462). The bottom surface of the limiting step (2462) abuts against the top surface of the claw (2522) of the auxiliary claw (247) located above. The top surface of the limiting step (2462) abuts against the bottom surface of the limiting plate (2511). The portion where the connecting pipe (246) and the connecting pipe (52) are inserted is provided with an annular sealing step (2463). The outer circumferential surface of the sealing step (2463) is inclined. The outer diameter of the sealing step (2463) near the accumulator (51) is smaller than the outer diameter of the sealing step (2463) away from the accumulator (51). The top end of the connecting pipe (246) is connected to the inlet end of the accumulator (51) via the connecting pipe (52), and the bottom end of the connecting pipe (52) is inserted into the part of the connecting pipe (246) that extends above the limiting plate (2511).

5. The special equipment for coating catheters and cannulas according to claim 1, characterized in that: The protective box (1) is provided with a support frame (12), and a support ring plate (13) is provided on the top surface of the support frame (12). The guide rail (23) is fixed on the support ring plate (13). The fixing component (24) includes a fixing frame (241) and a connector (242). One end of the fixing frame (241) and the side of the fixing plate (251) facing away from the catheter (8) are fixedly connected. A transition plate (243) extends from the bottom of the fixing frame (241) toward the direction close to the conveyor belt (21). A connecting plate (244) is fixedly connected to the bottom surface of the transition plate (243). Both the connecting plate (244) and the transition plate (243) are horizontally arranged. An installation block (245) is fixedly connected to the end of the connecting plate (244) near the conveyor belt (21). The connector (242) includes a C-shaped frame (2421) and a waist-shaped plate (2422). The middle section of the C-shaped frame (2421) is fixedly connected to the conveyor belt (21) by bolts. An installation plate (2423) is provided at the bottom of the C-shaped frame (2421). The two ends of the installation plate (2423) are fixedly connected to the two ends of the C-shaped frame (2421). A connecting shaft (2424) is provided on the top surface of the installation plate (2423). One end of the waist-shaped plate (2422) is fixedly connected to the top surface of the connecting shaft (2424). The other end of the waist-shaped plate (2422) is fixedly connected to the top surface of the installation block (245). The guiding assembly includes a guide wheel (26), which is rotatably connected to the bottom surface of the connecting plate (244). The guide wheel (26) is located on both sides of the track body width direction of the guide rail (23). V-shaped guide protrusions (231) are provided on both sides of the track body width direction of the guide rail (23). A V-shaped guide groove (261) is provided on the peripheral sidewall of the guide wheel (26), and the guide protrusion (231) is engaged in the guide groove (261).

6. The special equipment for coating catheters and cannulas according to claim 5, characterized in that: The drive assembly (22) includes a drive motor (221), a drive shaft (222), a bevel gear set, a driving gear (223), and a driven gear (224). The output shaft of the drive motor (221) is connected to the drive shaft (222) via the bevel gear set. The bevel gear set includes a first bevel gear (225) and a second bevel gear (226). The first bevel gear (225) is coaxially connected to the output shaft of the drive motor (221), and the second bevel gear (226) is coaxially connected to the output shaft of the drive motor (221). The first bevel gear (225) meshes with the second bevel gear (226) on the drive shaft (222). The top end of the drive shaft (222) passes through the drive wheel (223) and is coaxially connected with the drive wheel (223). The driven wheel (224) is rotatably connected to the support frame (12). The conveyor belt (21) is simultaneously sleeved on the drive wheel (223) and the driven wheel (224). The drive wheel (223) and the driven wheel (224) cooperate to tension the conveyor belt (21).

7. The special equipment for coating catheters and cannulas according to claim 5, characterized in that: Locking components (28) are provided on the outer side walls of both sides of the support ring plate (13) in the width direction. The locking components (28) are used to lock the fixing plate (251). The locking components (28) include a driving cylinder (281), a driving plate (282), a driving rod (283), and a locking plate (284). The driving cylinder (281) is disposed on the support ring plate (13). The cylinder body of the driving cylinder (281) is rotatably connected to the support ring plate (13). The piston of the driving cylinder (281) is... The piston rod is rotatably connected to the bottom end of the drive plate (282), the top end of the drive plate (282) is fixedly connected to the drive rod (283), the drive plate (282) swings about the central axis of the drive rod (283), the drive rod (283) is rotatably mounted on the side wall of the support ring plate (13) through the bearing seat (2831), the bottom end of the locking plate (284) is fixedly connected to the drive rod (283), and the lock plate (284) swings when the drive rod (283) rotates. The top surface of the locking plate (284) is provided with a locking boss (285), and the bottom surface of the fixing frame (241) near the fixing plate (251) is provided with a locking block (286). The side of the locking block (286) near the fixing plate (251) is provided with a locking groove (287). The locking boss (285) swings with the locking plate (284) to enter the locking groove (287) or to disengage from the locking groove (287). When the piston rod of the drive cylinder (281) extends, the bottom end of the drive plate (282) swings away from the support ring plate (13), causing the top end of the locking plate (284) to swing towards the support ring plate (13) until the locking protrusion enters the locking groove (287). When the piston rod of the drive cylinder (281) retracts, the bottom end of the drive plate (282) swings toward the support ring plate (13), causing the top end of the locking plate (284) to swing away from the support ring plate (13) until the locking protrusion disengages from the locking groove (287).

8. The special equipment for coating catheters and cannulas according to claim 1, characterized in that: The purging assembly (6) is located above the circulating conveying mechanism (2) and is located near the storage tank. The purging assembly (6) includes a purging air pipe (61) and a purging air pump (62). The outlet ends of the purging air pipe (61) and the purging air pump (62) are connected. The purging air pipe (61) is connected to an external ion air source through the purging air pump (62).

9. The special equipment for coating catheters and cannulas according to claim 1, characterized in that: The constant temperature air drying component (7) is located above the circulating conveying mechanism (2). The constant temperature air drying component (7) is offset from the material storage component (5). The constant temperature air drying component (7) includes an air drying pipe (71) and an air drying pump (72). The outlet end of the air drying pump (72) is connected to the air drying pipe (71). The air drying pipe (71) is connected to a constant temperature air source through the air drying pump (72).

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