An apparatus for uniform coating of a medical catheter surface

Abstract

The application discloses a kind of even coating devices of medical catheter surface coating, specifically relates to medical instrument production technical field, including rack, the middle part fixed connection of cavity of the rack is fixed with coating mechanism, coating mechanism left and right sides symmetrical arrangement has unwinding device, coating mechanism bottom fixed connection has transmission motor, transmission motor is rotated by hinged link two unwinding devices, coating mechanism upper end fixed connection has adjusting mechanism, coating mechanism left side fixed connection has drying mechanism.The even coating device of medical catheter surface coating described in the application, the cooperation of the pressure block in cooperation mechanism and the impeller is converted into rotary mechanical energy by the pressure of coating liquid, is driven fan operation by bevel gear one and bevel gear two transmission, need not be separately provided with driving motor for fan, save energy and make compact structure, realize coating rapid solidification drying and avoid coating flow drop by the cooperation of ultraviolet drying lamp and fan and air vent.

Description

Technical Field

[0001] This invention relates to the field of medical device manufacturing technology, and in particular to a uniform coating device for the surface coating of medical catheters. Background Technology

[0002] The field of medical device manufacturing technology includes production processes such as raw material forming, surface treatment, assembly testing, and sterilization packaging for various medical catheters, tubing, and implantable medical devices. Its core lies in achieving precise forming, functional coating preparation, and quality control of medical devices through specialized production equipment and processes to meet the clinical requirements for safety, cleanliness, and dimensional accuracy of medical devices.

[0003] Chinese Patent Publication No. CN112705409B discloses a uniform coating device for the surface coating of a medical catheter, including a medical catheter; a coating component including a mounting base movably disposed on one side of the medical catheter, the mounting base having a fixed arm at its end, and a coating roller fixedly connected to the end of the fixed arm; and a liquid-receiving and adsorption component, with a movable stage movably disposed on a guide rail. The invention involves setting a liquid-receiving and adsorption component on the surface of the medical catheter and moving it from bottom to top along its surface. As it continues to move to the upper part of the outer surface of the medical catheter, a liquid-absorbing plate moving along its surface moves to the desired coating thickness on the medical catheter surface with the cooperation of a detection component. Excess coating droplets are absorbed through the end of the liquid-absorbing plate, thereby ensuring that the coating thickness remains uniform throughout the surface of the medical catheter, without affecting subsequent use, improving coating quality, and reducing the generation of defective products.

[0004] In existing technologies, the liquid-absorbing plate of the liquid-receiving adsorption component moves back and forth along the surface of the medical catheter from bottom to top to absorb excess droplets. The end of the liquid-absorbing plate needs to move to the required coating thickness with the cooperation of the detection component. Thickness control depends on the liquid-absorbing plate wiping and absorbing droplets along the wet film surface one after another. The liquid-absorbing plate carries the absorbed droplets repeatedly across the catheter surface, which can easily bring the residual liquid back to the wet film and disturb the undried coating. Moreover, the liquid-absorbing plate needs to return to its original position after each absorption before it can enter the next cycle. The coating operation is performed intermittently with the reciprocating movement of the liquid-absorbing plate, and it is difficult to keep the catheter travel speed and the wiping rhythm of the liquid-absorbing plate in a continuous and consistent manner. Summary of the Invention

[0005] The main objective of this invention is to provide a uniform coating device for the surface coating of medical catheters, which can effectively solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A uniform coating device for the surface coating of medical catheters includes a frame, a coating mechanism fixedly connected to the middle of the inner cavity of the frame, unwinding devices symmetrically arranged on the left and right sides of the coating mechanism, a drive motor fixedly connected to the bottom of the coating mechanism, the drive motor driving the two unwinding devices to rotate through a hinge, an adjustment mechanism fixedly connected to the upper end of the coating mechanism, and a drying mechanism fixedly connected to the left side of the coating mechanism.

[0007] Preferably, the unwinding device includes a support plate, two support plates are fixedly connected to the upper right side of the support plate, and an unwinding reel is rotatably connected to the side of the two support plates that are close to each other. The medical catheter to be processed is wound around the outer surface of the unwinding reel. A bracket is fixedly connected to the middle of the support plate, and a guide tube is fixedly connected to the inner cavity of the bracket. The guide tube is used to guide the medical catheter wound on the surface of the unwinding reel. A fixing frame is fixedly connected to the upper left side of the support plate, and a traction mechanism for pulling the medical catheter is fixedly connected to the inner cavity of the fixing frame.

[0008] Preferably, the traction mechanism includes two traction wheel bases. The sides of the two traction wheel bases that are far apart from each other are fixedly connected to a fixed frame. The sides of the two traction wheel bases that are close to each other are fixedly connected to a pressing block. A rotating wheel is rotatably connected to the middle of the sides of the two traction wheel bases that are close to each other. A plurality of clamping buckles are rotatably connected to the outer surface of the rotating wheel. During rotation, the plurality of clamping buckles cooperate with the two pressing blocks.

[0009] Preferably, the clamping buckle includes a U-shaped block, with sliding rods slidably connected to both sides of the U-shaped block, a clamping plate fixedly connected to the side of the two sliding rods that are close to each other, a slider fixedly connected to the side of the two sliding rods that are far from each other, and a spring wound around the outer surface of the two sliding rods. When the two springs are in contact with the two compression blocks and are in a sliding connection, the two sliders move closer to each other, thereby causing the clamping plate fixedly connected to the side that moves closer to each other to clamp the medical catheter. When the two springs disengage from the two compression blocks, the two springs wound around the outer surface of the sliding rod will reset due to their own elasticity, causing the two clamping plates to disengage from the medical catheter.

[0010] Preferably, the coating mechanism includes a liquid storage chamber, which is fixedly connected to the middle of the frame. A connecting shell is fixedly connected to the upper part of the liquid storage chamber. An iris mechanism is fixedly connected to the left side of the connecting shell. A temperature detector is fixedly connected to the front left side of the connecting shell. The temperature detector is used to monitor the coated liquid in real time.

[0011] Preferably, the iris mechanism includes a retaining ring, which is fixedly connected to the left side of the liquid storage chamber. The retaining ring has several mounting holes on its surface. Each of the mounting holes is rotatably connected to a blade pin, and each of the blade pins is fixedly connected to an iris blade on the other side. Each of the iris blades is fixedly connected to a blade pin on the other side. The outer surfaces of the blade pins are slidably connected to a drive ring, and the drive ring has several sliding grooves on its left side. Each of the blade pins is slidably connected to the sliding grooves. After coating is completed, the operator can rotate several iris blades by rotating the drive ring. During the rotation of the iris blades, the inner diameter can be adjusted, thereby scraping off any excess coating thickness.

[0012] Preferably, the adjustment mechanism includes an electric telescopic rod, the output end of which is fixedly connected to the top of the connecting shell, a coating device is fixedly connected to the output end of the electric telescopic rod, a coating head is connected to both the front and rear sides of the coating device, a coating head is fixedly connected to the middle of the bottom of the coating device, and a conveying structure is fixedly connected to the left side of the coating device.

[0013] Preferably, the conveying structure includes a conveying pipe, one side of which is fixedly connected to the conveying structure, and the other side of which is fixedly connected to a water pump, and the input end of the water pump is fixedly connected to a cooperating mechanism.

[0014] Preferably, the cooperating mechanism includes a second conveying pipe, a transmission rod rotatably connected to the inner cavity of the second conveying pipe, an impeller fixedly connected to the right side of the transmission rod, a helical gear first fixedly connected to the left side of the transmission rod, the helical gear first being fixedly connected to the drying mechanism, and a pressure block fixedly connected to the bottom of the inner cavity of the second conveying pipe.

[0015] Preferably, the drying mechanism includes a shell, the inner cavity of the shell has a groove, a plurality of ultraviolet drying lamps are fixedly connected to the top of the groove, a ventilation opening is provided on the front side of the shell, a fan is fixedly connected to the rear of the shell, a second bracket is fixedly connected to the rear of the shell, a connecting column passing through the second bracket is fixedly connected to the middle of the fan, and a second helical gear is fixedly connected to the rear of the connecting column, the second helical gear cooperating with the first helical gear.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The unwinding and rewinding are synchronized through the cooperation of the drive motor and two unwinding reels, ensuring uniform and stable tension during the medical catheter's journey. The guide tube guides the medical catheter to prevent it from deviating, tangling, or bending. The clamping buckles and compression blocks in the traction mechanism enable continuous intermittent traction and transport of the medical catheter, allowing it to enter the coating mechanism at a uniform and stable linear speed. The elasticity of the springs in the clamping buckles ensures a gentle and controllable clamping force, guaranteeing sufficient traction while avoiding damage to the catheter surface. The overall system achieves uniform coating and continuous automated production of the medical catheter surface through the coordinated operation of the unwinding device, traction mechanism, and coating mechanism.

[0017] 2. The coating thickness exceeding the allowable thickness is scraped off by the cooperation between the drive ring and the iris blade in the iris mechanism. The rotation of the drive ring drives the second blade pin to slide along the sliding groove, causing the iris blade to rotate around the first blade pin and simultaneously close or open, achieving flexible adjustment of the inner diameter. This ensures that the coating thickness is uniform when the medical catheter passes through. At the same time, the inner diameter can be flexibly adjusted according to different catheter specifications, improving the versatility and applicability of the device. The coating liquid is monitored in real time by a temperature detector to maintain the appropriate viscosity and fluidity of the coating liquid, ensuring the uniformity and adhesion of the coating.

[0018] 3. The coating spacing is adjusted in real time by cooperating with the electric telescopic rod in the adjustment mechanism and the coating device. The coating head 1 and the coating head 2 spray the circumferential surface of the medical catheter in multiple directions, so that the coating liquid fully covers the surface of the catheter and ensures that the coating thickness is consistent. The pressure block and the impeller in the cooperating mechanism convert the pressure of the coating liquid into rotational mechanical energy, which drives the fan to run through the transmission of helical gear 1 and helical gear 2. There is no need to set a separate drive motor for the fan, saving energy and making the structure compact. The ultraviolet drying lamp, the fan and the ventilation port work together to achieve rapid curing and drying of the coating and prevent the coating from flowing and dripping. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention from another perspective; Figure 3 This is a schematic diagram of the overall structure of the unwinding device of the present invention; Figure 4 This is a schematic diagram of the overall structure of the traction mechanism of the present invention; Figure 5 This is a schematic diagram of the overall structure of the clamping buckle of the present invention; Figure 6 This is a schematic diagram of the overall structure of the adjustment mechanism of the present invention; Figure 7 This is a schematic diagram of the overall structure of the iris recognition mechanism of the present invention; Figure 8This is a schematic diagram of the overall structure of the conveying structure of the present invention; Figure 9 This is a schematic diagram showing the cooperation between the cooperating mechanism and the drying mechanism of the present invention; Figure 10 This is a cross-sectional view of the overall structure of the mating mechanism of the present invention.

[0020] In the diagram: 1. Frame; 2. Unwinding device; 21. Bearing plate; 22. Support plate; 23. Unwinding reel; 24. Medical catheter; 25. Guide tube; 26. Support 1; 27. Fixing frame; 28. Traction mechanism; 281. Traction wheel base; 282. Extrusion block; 283. Rotating wheel; 284. Clamping buckle; 2841. U-shaped block; 2842. Clamping plate; 2843. Sliding rod; 2844. Slider; 2845. Spring; 3. Coating mechanism; 31. Liquid storage chamber; 32. Connecting shell; 33. Iris mechanism; 331. Snap ring; 332. Mounting hole; 333. Iris blade; 334. Blade pin 1; 335. Blade 336. Drive ring; 337. Sliding groove; 34. Temperature detector; 4. Adjustment mechanism; 41. Electric telescopic rod; 42. Coating device; 43. Coating head one; 44. Coating head two; 45. Conveying structure; 451. Conveying pipe one; 452. Water pump; 453. Matching mechanism; 4531. Conveying pipe two; 4532. Impeller; 4533. Transmission rod; 4534. Helical gear one; 4535. Pressure block; 5. Drying mechanism; 51. Outer shell; 52. Ultraviolet drying lamp; 53. Ventilation port; 54. Groove; 55. Fan; 56. Support two; 57. Connecting column; 58. Helical gear two; 6. Drive motor. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0022] Example 1, as Figure 1 , Figure 2 , Figure 3 , Figure 4 as well as Figure 5As shown, a uniform coating device for the surface of a medical catheter includes a frame 1, which serves as the supporting foundation for the entire device. A coating mechanism 3 is fixedly connected to the center of the inner cavity of the frame 1. The coating mechanism 3 is used to coat the surface of a medical catheter 24. Unwinding devices 2 are symmetrically arranged on the left and right sides of the coating mechanism 3. The unwinding reels 23 in the two unwinding devices 2 are mirror images of each other. The right unwinding device 2 is used to unwind the medical catheter 24 to be processed, and the left unwinding device 2 is used to wind up the medical catheter 24 after coating and drying. A drive motor 6 is fixedly connected to the bottom of the coating mechanism 3. The drive motor 6 drives the two unwinding devices 2 on the left and right sides to rotate synchronously through a hinge, so that the right unwinding reel 23 is stable. While releasing the medical catheter 24, the left unwinding reel 23 smoothly winds up the processed medical catheter 24. The simultaneous release and winding helps ensure that the medical catheter 24 has uniform tension and smooth movement throughout the process. The upper end of the coating mechanism 3 is fixedly connected to the adjustment mechanism 4, which is used to adjust the coating position according to the diameter of the medical catheter 24 and the coating process requirements. The left side of the coating mechanism 3 is fixedly connected to the drying mechanism 5, which is used to dry and cure the coating on the surface of the medical catheter 24 after coating. The entire device achieves uniform control of the coating thickness on the surface of the medical catheter 24 and continuous and automated production through the coordinated operation of unwinding, traction, coating, scraping, drying and winding.

[0023] Furthermore, the unwinding device 2 includes a support plate 21, which serves as the mounting base for the unwinding device 2. Two support plates 22 are fixedly connected to the upper right side of the support plate 21. An unwinding reel 23 is rotatably connected to the side of the two support plates 22 that are close to each other. A medical catheter 24 to be processed is wound around the outer surface of the unwinding reel 23. The unwinding reel 23 rotates smoothly under the drive of the drive motor 6 via a hinge, continuously releasing the medical catheter 24 wound around its outer surface. A bracket 26 is fixedly connected to the middle of the support plate 21. A guide tube 25 is fixedly connected to the inner cavity of the bracket 26. The guide tube 25 is used to guide the medical catheter 24 wound on the surface of the unwinding reel 23, so that the medical catheter 24 always travels straight along the set path. This helps to avoid the catheter from deviating, tangling or bending during the unwinding process, thereby ensuring the uniformity and continuity of the subsequent coating operation. A fixing frame 27 is fixedly connected to the upper left side of the support plate 21. A traction mechanism 28 for pulling the medical catheter 24 is fixedly connected to the inner cavity of the fixing frame 27. The traction mechanism 28 continuously pulls and transports the medical catheter 24, so that the medical catheter 24 enters the coating mechanism 3 at a uniform and stable linear speed.

[0024] Furthermore, the traction mechanism 28 includes two traction wheel bases 281. The sides of the two traction wheel bases 281 that are far apart from each other are fixedly connected to the fixed frame 27. The sides of the two traction wheel bases 281 that are close to each other are fixedly connected to pressing blocks 282. A rotating wheel 283 is rotatably connected to the middle of the sides of the two traction wheel bases 281 that are close to each other. Several clamping buckles 284 are rotatably connected to the outer surface of the rotating wheel 283. During rotation, the clamping buckles 284 cooperate with the two pressing blocks 282. When the rotating wheel 283 rotates, it drives the clamping buckles 284 to rotate synchronously around the axis of the rotating wheel 283. When the clamping buckle 284 rotates to a position opposite to the compression block 282, the clamping buckle 284 contacts the compression block 282 and slides, thereby triggering the clamping buckle 284 to clamp the medical catheter 24 and pull the medical catheter 24 forward. After the clamping buckle 284 rotates past the position of the compression block 282, the clamping buckle 284 disengages from the compression block 282 and releases the clamping of the medical catheter 24. Several clamping buckles 284 alternately cooperate with the two compression blocks 282 in this way to realize continuous intermittent traction and delivery of the medical catheter 24, which helps to ensure that the medical catheter 24 travels at a uniform and stable speed.

[0025] Furthermore, the clamping buckle 284 includes a U-shaped block 2841, with sliding rods 2843 slidably connected to both sides of the U-shaped block 2841. A clamping plate 2842 is fixedly connected to the side of the two sliding rods 2843 that are close to each other, and a slider 2844 is fixedly connected to the side of the two sliding rods 2843 that are far apart from each other. Springs 2845 are wound around the outer surfaces of both sliding rods 2843. When the two springs 2845 contact and are slidably connected to the two compression blocks 282, the two sliders 2844 move closer together under the continuous compression of the compression blocks 282. This causes the two sliding rods 2843 to slide inward along the left and right sides of the U-shaped block 2841, so that the clamping plate 2842 fixedly connected to the side that is close to each other provides support for the medical device. The catheter 24 is clamped, and the clamping buckle 284 continues to rotate with the rotating wheel 283 in the clamping state, thereby pulling the medical catheter 24 forward stably. When the two springs 2845 disengage from the two compression blocks 282, the springs 2845 wrapped around the outer surface of the sliding rod 2843 will push the two sliders 2844 away from each other through their own elasticity, thereby driving the two sliding rods 2843 to slide outward and reset along the left and right sides of the U-shaped block 2841, so that the two clamping plates 2842 disengage from the medical catheter 24, completing one traction action. The elasticity of the springs 2845 makes the clamping force gentle and controllable, which is conducive to ensuring sufficient traction force and avoiding pressure or scratches on the surface of the medical catheter 24 caused by rigid clamping.

[0026] The unwinding and rewinding are synchronized through the cooperation of the drive motor 6 and the two unwinding reels 23, ensuring that the tension of the medical catheter 24 is uniform and stable. The guide tube 25 guides the medical catheter 24 to prevent it from deviating, tangling, or bending. The clamping buckle 284 and the compression block 282 in the traction mechanism 28 achieve continuous intermittent traction and delivery of the medical catheter 24, allowing the catheter to enter the coating mechanism 3 at a uniform and stable linear speed. The elasticity of the spring 2845 in the clamping buckle 284 makes the clamping force gentle and controllable, ensuring sufficient traction force while avoiding damage to the catheter surface. The overall process of uniform coating and continuous automated production of the coating on the surface of the medical catheter 24 is achieved through the coordinated cooperation of the unwinding device 2, the traction mechanism 28, and the coating mechanism 3.

[0027] Example 2, based on Example 1, achieves the purpose of scraping off the coating thickness on the surface of the medical catheter. For further details, please refer to [link to example]. Figure 6 and Figure 7 As shown, the coating mechanism 3 includes a liquid storage chamber 31, which is fixedly connected to the middle of the frame 1. The liquid storage chamber 31 is used to store the coating liquid. A connecting shell 32 is fixedly connected to the upper part of the liquid storage chamber 31. The connecting shell 32 is used to install the adjustment mechanism 4 and provide a channel for the delivery of the coating liquid. An iris mechanism 33 is fixedly connected to the left side of the connecting shell 32. The iris mechanism 33 is used to scrape off the coating on the surface of the medical catheter 24 that exceeds the set thickness after coating, so that the coating thickness is uniform. A temperature detector 34 is fixedly connected to the front left side of the connecting shell 32. The temperature detector 34 is used to monitor the coated liquid in real time, so that the operator can keep track of the temperature status of the coating liquid and adjust it in time, so that the coating liquid always maintains a suitable viscosity and fluidity, thereby ensuring the uniformity and adhesion performance of the coating.

[0028] Furthermore, the iris mechanism 33 includes a retaining ring 331, which is fixedly connected to the left side of the liquid storage chamber 31. The retaining ring 331 has several mounting holes 332 on its surface. Each mounting hole 332 has a rotatably connected blade pin 334. Iris blades 333 are fixedly connected to the other side of each blade pin 334. Each iris blade 333 has several blade pins 335 fixedly connected to the other side of each blade pin 333. A drive ring 336 is slidably connected to the outer surface of each blade pin 335. The drive ring 336 has several sliding grooves 337 on its left side, and each blade pin 335 is slidably connected to one of the sliding grooves 337. After coating is completed, the operator can drive the blades by rotating the drive ring 336. Pin 2 335 slides along sliding groove 337, thereby driving several iris blades 333 to rotate around blade pin 1 334 in mounting hole 332. During rotation, the several iris blades 333 synchronously close or open, which can adjust the inner diameter. When the medical catheter 24 passes through iris mechanism 33, the closed iris blades 333 can scrape off the coating that exceeds the set thickness, so that the coating thickness on the surface of the medical catheter 24 is uniform. At the same time, the operator can flexibly rotate drive ring 336 to adjust the inner diameter of iris blades 333 according to the coating thickness requirements of different specifications of medical catheters 24, so that the device can adapt to the coating needs of various specifications of catheters, which is conducive to improving the versatility and applicability of the device.

[0029] The coating thickness exceeding the allowable thickness is scraped off by the cooperation between the drive ring 336 and the iris blade 333 in the iris mechanism 33. The rotation of the drive ring 336 drives the blade pin 2 335 to slide along the sliding groove 337, causing the iris blade 333 to rotate around the blade pin 1 334 and simultaneously close or open, achieving flexible adjustment of the inner diameter. This ensures that the coating thickness is uniform when the medical catheter 24 passes through. At the same time, the inner diameter can be flexibly adjusted according to different catheter specifications, improving the versatility and applicability of the device. The temperature detector 34 monitors the coating liquid in real time to maintain the appropriate viscosity and fluidity of the coating liquid, ensuring the uniformity and adhesion of the coating.

[0030] Example 3 further achieves the purpose of coating and drying medical catheters based on Examples 1 and 2. Please refer to [link / reference]. Figure 8 , Figure 9 as well as Figure 10As shown, the adjustment mechanism 4 includes an electric telescopic rod 41. The output end of the electric telescopic rod 41 is fixedly connected to the top of the connecting shell 32. The output end of the electric telescopic rod 41 is fixedly connected to a coating device 42. When the electric telescopic rod 41 extends or retracts, it can drive the coating device 42 to move up and down, thereby adjusting the coating distance between the coating head 1 43 and the coating head 2 44 relative to the surface of the catheter in real time according to the diameter of the medical catheter 24 and the coating process requirements. This allows the coating liquid to adhere evenly and stably to the surface of the catheter, which helps to ensure the consistency of the coating thickness. The coating head 1 43 is connected to both the front and rear sides of the coating device 42. The coating head 2 44 is fixedly connected to the middle of the bottom end of the coating device 42. The coating head 1 43 and the coating head 2 44 spray the circumferential surface of the medical catheter 24 evenly in multiple directions, so that the coating liquid fully covers the surface of the catheter. A conveying structure 45 is fixedly connected to the left side of the coating device 42. The conveying structure 45 is used to convey the coating liquid in the reservoir 31 to the coating device 42.

[0031] Furthermore, the conveying structure 45 includes a conveying pipe 451. One side of the conveying pipe 451 is fixedly connected to the conveying structure 45, and the other side of the conveying pipe 451 is fixedly connected to a water pump 452. After the water pump 452 is started, it pumps the coating liquid in the storage chamber 31 to the coating device 42 through the conveying pipe 451, providing a stable supply of coating liquid for the coating operation. The input end of the water pump 452 is fixedly connected to a cooperating mechanism 453. The cooperating mechanism 453 is used to pressurize the coating liquid and use the pressurized liquid pressure to drive the fan 55 in the drying mechanism 5 to rotate, so as to realize the linkage between the coating liquid conveying and the drying mechanism 5.

[0032] Furthermore, the cooperating mechanism 453 includes a second conveying pipe 4531, which draws the coating liquid from the inner cavity of the storage chamber 31. A transmission rod 4533 is rotatably connected to the inner cavity of the second conveying pipe 4531. An impeller 4532 is fixedly connected to the right side of the transmission rod 4533, and a helical gear 4534 is fixedly connected to the left side of the transmission rod 4533. The helical gear 4534 is fixedly connected to the drying mechanism 5. A pressure block 4535 is fixedly connected to the bottom of the inner cavity of the second conveying pipe 4531. The coating liquid is pressurized when passing through the pressure block 4535, and the pressurized coating liquid drives the impeller 4532 to rotate within the inner cavity of the second conveying pipe 4531. Wheel 4532 drives transmission rod 4533 to rotate. Helical gear 4534, which is fixedly connected to the left side of transmission rod 4533, cooperates with helical gear 58 in drying mechanism 5, thereby driving helical gear 58 to rotate. The hydraulic pressure formed by the pressurizing block 4535 drives impeller 4532 to rotate, and the power is transmitted to fan 55 in drying mechanism 5 through the cooperation of helical gear 4534 and helical gear 58. There is no need to set a separate drive motor for fan 55, which helps to save energy and make the device structure more compact. At the same time, fan 55 operates automatically with the delivery of coating liquid and is linked with ultraviolet drying lamp 52.

[0033] Furthermore, the drying mechanism 5 includes a housing 51, with a groove 54 inside the housing 51. Several ultraviolet drying lamps 52 are fixedly connected to the top of the groove 54. These ultraviolet drying lamps 52 rapidly cure and dry the coating on the surface of the medical catheter 24 after homogenization treatment by the iris mechanism 33. A ventilation opening 53 is provided on the front side of the housing 51. A fan 55 is fixedly connected to the rear of the housing 51. A second support 56 is fixedly connected to the rear of the housing 51. A connecting post 57, penetrating the second support 56, is fixedly connected to the middle of the fan 55. 7. A helical gear 2 58 is fixedly connected to the rear. The helical gear 2 58 cooperates with the helical gear 1 4534. When the helical gear 1 4534 rotates under the drive of the cooperating mechanism 453, the helical gear 2 58 rotates accordingly and drives the fan 55 to run synchronously through the connecting column 57. The fan 55 cooperates with the vent 53 to form a continuous airflow circulation during the drying process, which accelerates the evaporation of solvent and moisture in the coating, so that the coating can be quickly set. This helps to prevent the coating from flowing or dripping in an incompletely dried state, which would damage the uniformity of the coating.

[0034] The coating spacing is adjusted in real time by the cooperation of the electric telescopic rod 41 in the adjustment mechanism 4 and the coating device 42. The coating head 1 43 and the coating head 2 44 spray the medical catheter 24 in multiple directions around the circumference, so that the coating liquid fully covers the surface of the catheter and ensures that the coating thickness is consistent. The pressure block 4535 in the cooperation mechanism 453 and the impeller 4532 convert the pressure of the coating liquid into rotational mechanical energy, which drives the fan 55 to run through the transmission of the helical gear 1 4534 and the helical gear 2 58. There is no need to set a separate drive motor for the fan 55, saving energy and making the structure compact. The ultraviolet drying lamp 52, the fan 55 and the ventilation port 53 cooperate to achieve rapid curing and drying of the coating and prevent the coating from flowing and dripping.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A uniform coating apparatus for the surface coating of a medical catheter, comprising a frame (1), characterized in that: The inner cavity of the frame (1) is fixedly connected to a coating mechanism (3). The coating mechanism (3) is symmetrically provided with unwinding devices (2) on the left and right sides. The bottom of the coating mechanism (3) is fixedly connected to a drive motor (6). The drive motor (6) drives the two unwinding devices (2) to rotate through a hinge. The upper end of the coating mechanism (3) is fixedly connected to an adjustment mechanism (4). The left side of the coating mechanism (3) is fixedly connected to a drying mechanism (5).

2. The uniform coating device for the surface coating of a medical catheter according to claim 1, characterized in that: The unwinding device (2) includes a support plate (21). Two support plates (22) are fixedly connected to the upper right side of the support plate (21). The two support plates (22) are rotatably connected to an unwinding reel (23) on the side close to each other. A medical catheter (24) to be processed is wound around the outer surface of the unwinding reel (23). A bracket (26) is fixedly connected to the middle of the support plate (21). A guide tube (25) is fixedly connected to the inner cavity of the bracket (26). The guide tube (25) is used to guide the medical catheter (24) wound on the surface of the unwinding reel (23). A fixing frame (27) is fixedly connected to the upper left side of the support plate (21). A traction mechanism (28) for traction of the medical catheter (24) is fixedly connected to the inner cavity of the fixing frame (27).

3. The uniform coating device for the surface coating of a medical catheter according to claim 2, characterized in that: The traction mechanism (28) includes two traction wheel bases (281). The two traction wheel bases (281) are fixedly connected to the fixed frame (27) on the side away from each other. The two traction wheel bases (281) are fixedly connected to the side close to each other with a pressing block (282). A rotating wheel (283) is rotatably connected to the middle of the side close to each other of the two traction wheel bases (281). A plurality of clamping buckles (284) are rotatably connected to the outer surface of the rotating wheel (283). The plurality of clamping buckles (284) cooperate with the two pressing blocks (282) during rotation.

4. The uniform coating device for the surface coating of a medical catheter according to claim 3, characterized in that: The clamping buckle (284) includes a U-shaped block (2841), and sliding rods (2843) are slidably connected to both sides of the U-shaped block (2841). A clamping plate (2842) is fixedly connected to the side of the two sliding rods (2843) that are close to each other, and a slider (2844) is fixedly connected to the side of the two sliding rods (2843) that are far apart from each other. A spring (2845) is wound around the outer surface of the two sliding rods (2843). When the two springs (2845) are in contact with the two compression blocks (282) and are in a sliding connection, the two sliders (2844) move closer to each other, so that the clamping plate (2842) fixedly connected on the side that moves closer to each other clamps the medical catheter (24); When the two springs (2845) disengage from the two compression blocks (282), the two springs (2845) wound around the outer surface of the sliding rod (2843) will reset through their own elasticity, causing the two clamping plates (2842) to disengage from the medical catheter (24).

5. The uniform coating device for the surface coating of a medical catheter according to claim 1, characterized in that: The coating mechanism (3) includes a liquid storage chamber (31), which is fixedly connected to the middle of the frame (1). A connecting shell (32) is fixedly connected to the upper part of the liquid storage chamber (31). An iris mechanism (33) is fixedly connected to the left side of the connecting shell (32). A temperature detector (34) is fixedly connected to the front left side of the connecting shell (32). The temperature detector (34) is used to monitor the coated liquid in real time.

6. The uniform coating device for the surface coating of a medical catheter according to claim 5, characterized in that: The iris mechanism (33) includes a retaining ring (331), which is fixedly connected to the left side of the liquid storage chamber (31). The retaining ring (331) has several mounting holes (332) on its surface. Each of the mounting holes (332) is rotatably connected to a blade pin (334). Each of the blade pins (334) is fixedly connected to an iris blade (333) on its other side. Each of the iris blades (333) is fixedly connected to a blade pin (335) on its other side. The outer surfaces of the blade pins (335) are slidably connected to a drive ring (336). Each of the drive ring (336) has several sliding grooves (337) on its left side. Each of the blade pins (335) is slidably connected to the sliding grooves (337). After the coating is completed, the operator can drive several iris blades (333) to rotate by rotating the drive ring (336). During the rotation, the inner diameter of the several iris blades (333) can be adjusted, thereby scraping off the excess coating thickness.

7. The uniform coating device for the surface coating of a medical catheter according to claim 5, characterized in that: The adjustment mechanism (4) includes an electric telescopic rod (41), the output end of which is fixedly connected to the top of the connecting shell (32), and a coating device (42) is fixedly connected to the output end of the electric telescopic rod (41). A coating head (43) is connected to both the front and rear sides of the coating device (42), and a coating head (44) is fixedly connected to the middle of the bottom end of the coating device (42). A conveying structure (45) is fixedly connected to the left side of the coating device (42).

8. The uniform coating device for the surface coating of a medical catheter according to claim 7, characterized in that: The conveying structure (45) includes a conveying pipe (451), one side of which is fixedly connected to the conveying structure (45), and the other side of which is fixedly connected to a water pump (452). The input end of the water pump (452) is fixedly connected to a cooperating mechanism (453).

9. The uniform coating device for the surface coating of a medical catheter according to claim 8, characterized in that: The cooperating mechanism (453) includes a second conveying pipe (4531), a transmission rod (4533) is rotatably connected to the inner cavity of the second conveying pipe (4531), an impeller (4532) is fixedly connected to the right side of the transmission rod (4533), a helical gear (4534) is fixedly connected to the left side of the transmission rod (4533), the helical gear (4534) is fixedly connected to the drying mechanism (5), and a pressure block (4535) is fixedly connected to the bottom of the inner cavity of the second conveying pipe (4531).

10. The uniform coating device for the surface coating of a medical catheter according to claim 9, characterized in that: The drying mechanism (5) includes a shell (51), the inner cavity of the shell (51) is provided with a groove (54), a number of ultraviolet drying lamps (52) are fixedly connected to the top of the groove (54), a ventilation port (53) is provided on the front side of the shell (51), a fan (55) is fixedly connected to the rear of the shell (51), a bracket (56) is fixedly connected to the rear of the shell (51), a connecting column (57) is fixedly connected to the middle of the fan (55) through the bracket (56), a helical gear (58) is fixedly connected to the rear of the connecting column (57), and the helical gear (58) cooperates with the helical gear (4534).

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