Turnover tool and medical catheter coating method using same

Abstract

The invention relates to a turn-over tool and a medical catheter coating method using the turn-over tool, the turn-over tool is used for medical catheter coating, and the turn-over tool comprises a core tube which is hollow inside and forms a turn-over cavity, and an ejector pin capable of extending into the core tube; and the core tube can extend into the catheter. Compared with the prior art, the special tool has the beneficial effects that the specific tool is adopted for turning over the medical catheter, the inner surface is turned out to form the outer surface, so that the medical catheter is conveniently coated, it is guaranteed that a coating is evenly distributed on the inner surface of the catheter, the problem that in a traditional method, the coating is not uniform is avoided, dead corners of the coating are reduced, and the service life of the medical catheter is prolonged. The quality of the coating is easier to control; compared with a traditional inner surface coating technology, the method is more visual and simpler to operate.

Description

Technical Field

[0001] The invention relates to the field of production of medical catheters, and in particular to a turning tool and a medical catheter coating method using the same. Background Art

[0002] There are indeed many technical challenges in coating the inner wall of medical hoses, especially when the coating thickness and uniformity need to be carefully controlled. The following are several major difficulties: the lumen geometry is complex, and the inner diameter of medical hoses is usually small, which limits the fluidity and distribution of coating materials, and some catheters have complex bending or branching structures, which makes it difficult for the coating material to evenly cover all surfaces; coating methods have great limitations, such as the dip-coating method: this method is difficult to control the distribution of coating materials inside the lumen, especially in slender or curved lumens, and the nozzle in the spray-coating method is difficult to enter the lumen, and the deposition efficiency of spray particles in a small space is not high, which can easily cause local over-thickness or over-thinness. In addition, due to the structural limitations of medical catheters, it is very difficult to ensure the uniformity and consistency of the coating on the inner wall of the hose, especially when multiple layers of coating are required, and coating defects are prone to occur. Bubbles, pinholes or discontinuous areas are prone to occur during the coating process, and these defects will affect the effect and service life of the coating. Summary of the invention

[0003] In order to solve the above problems existing in the prior art, the present invention provides a turning tool and a medical catheter coating method using the same.

[0004] The above-mentioned problem of the present invention is solved by the following technical solutions: A turning tool is used for coating of medical catheters, comprising a core tube with a hollow interior to form a turning cavity, and a thimble capable of extending into the core tube; the core tube can extend into the interior of the catheter.

[0005] The above technical solution is further configured as follows: the inner diameter of the turnover cavity is greater than the diameter of the ejector pin.

[0006] The above technical solution is further configured as follows: an annular gap is formed between the inner wall of the turnover cavity and the outer wall of the ejector pin, and a catheter can pass through the annular gap.

[0007] The above technical solution is further configured as follows: the ejector head is configured as an arc-shaped ejector holding surface.

[0008] The present invention also provides a medical catheter coating method, using the above-mentioned turning tool, comprising the following steps: S1. Material preparation: catheters to be coated, coating solutions, light curing equipment, and flipping tooling; S2. Pretreatment: Physical or chemical pretreatment of the catheter surface; S3, flipping: putting the catheter on the core tube, and after the end is located outside the core tube, tighten the end to form a closed end; push the closed end toward the inside of the core tube with a push pin, and push it out from the other end of the core tube; S4, coating: apply the coating solution to the outer surface of the inverted catheter and check the coating effect; S5: Curing: Use a light curing device to cure the outer surface of the coating in S4; S6: Catheter recovery: Use the turning tool to turn the catheter back using the S3 method.

[0009] The above technical solution is further configured as follows: in step S1, the catheter is quality inspected and cleaned.

[0010] The above technical solution is further configured as follows: in step S4, the coating method may be spray coating or dipping coating.

[0011] The above technical solution is further configured as follows: between step S2 and step S3, a coating operation of step S4 and a curing operation of step S5 are added.

[0012] Compared with the prior art, the beneficial effects of the present invention are: using specific tooling to turn over the medical catheter, turning the inner surface out to form an "outer surface", thereby facilitating coating treatment thereof, ensuring that the coating is evenly distributed on the inner surface of the catheter, avoiding the problem of uneven coating that may occur in traditional methods, reducing the generation of coating dead corners, and making it easier to control the quality of the coating; compared with traditional inner surface coating technology, this method is more intuitive and simpler to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure in which the catheter is sleeved onto the core tube.

[0014] Figure 2 A schematic diagram of the structure for forming a closed end at one end of the catheter.

[0015] Figure 3 It is a schematic diagram of the structure for pushing the jack into the closed end.

[0016] Figure 4 This is a flow chart of the steps of Embodiment 2.

[0017] Figure 5 This is a flowchart of the steps of Example 3.

[0018] Labels on the accompanying drawings: 100, catheter; 200, core tube; 300, ejector pin; 201, turning cavity; 210, closed end. DETAILED DESCRIPTION

[0019] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0020] like Figure 1-5 As shown, the following embodiments disclose a turning tool and a medical catheter coating method using the same.

[0021] Embodiment 1: A turning tool for coating a medical catheter 100 , comprising a core tube 200 with a hollow interior to form a turning cavity 201 , and a ejector pin 300 capable of extending into the core tube 200 ; the core tube 200 can extend into the interior of the catheter 100 .

[0022] The above is the basic solution of this embodiment.

[0023] Specific reference Figure 1-3 As shown, this embodiment is used in the surface coating of a medical catheter 100 or a hose, and its purpose is to coat the narrow inner wall of the hose. The specific operation method is: the catheter 100 is inserted into the outside of the core tube 200, and one end of the catheter 100 is exposed outside the core tube 200, and the end of the catheter 100 exposed outside the core tube 200 is tied tightly to form a closed end 210, and the ejector pin 300 is aligned with the closed end 210, and the closed end 210 is pushed toward the inside of the core tube 200, and is continuously pushed; while the closed end 210 of the catheter 100 is pushed, the catheter 100 sleeved outside the core tube 200 continuously moves toward the end of the core tube 200, and after being turned over from the end, enters the flip cavity 201 of the core tube 200.

[0024] When all the catheters 100 are turned over and enter the turning cavity 201, at this time, the ejector pin 300 is located inside the turned-over catheter 100, and pushes the catheter 100 out of the turning cavity 201 by holding the closed end 210, so that the ejected catheter 100 is the turned-over catheter 100, thereby completing the turning action.

[0025] In this embodiment, the end of the catheter 100 can be tied with a rope, or tightened with a clamp, or a closed cover can be provided to cover and fix the end of the catheter 100, and the ejector pin 300 supports the closed cover.

[0026] In this embodiment, in order to ensure that the ejector pin 300 can push the closed end 210 of the catheter 100 into the turning cavity 201 , the inner diameter of the turning cavity 201 is greater than the diameter of the ejector pin 300 .

[0027] If the diameter of the ejector pin 300 is consistent with the inner diameter of the flip chamber 201, when the ejector pin 300 pushes the closed end 210 of the catheter 100 in, the ejector pin 300 and the inner wall of the flip chamber 201 will squeeze the catheter 100, damaging the catheter 100 or making it impossible to push the closed end 210 of the catheter 100 in smoothly. Therefore, it is necessary to ensure that the inner diameter of the flip chamber 201 is larger than the diameter of the ejector pin 300.

[0028] Preferably, an annular gap is formed between the inner wall of the turnover cavity 201 and the outer wall of the ejector pin 300, and the catheter 100 can pass through the annular gap.

[0029] In order to prevent the outer wall of the ejector pin 300 and the inner wall of the turnover cavity 201 from contacting with the inner and outer walls of the catheter 100 and causing friction, thereby damaging the outer periphery of the catheter 100 , in this embodiment, the width of the environmental gap is greater than the thickness of the catheter 100 .

[0030] By selecting an ejector pin 300 with a suitable diameter, an annular gap with a width greater than the wall thickness of the catheter 100 is generated between the ejector pin 300 and the turnover cavity 201, thereby meeting the coating requirements of catheters 100 with different wall thicknesses.

[0031] In order to prevent the ejector pin 300 from damaging the catheter 100 when closing the end 210 of the catheter 100 , in this embodiment, the head of the ejector pin 300 is configured as an arc-shaped ejection surface.

[0032] The ejector pin 300 is configured to be cylindrical, and the end of the cylinder can be configured to be spherical, or an arc connection can be configured between the end surface and the circumference, so that the contact portion between the ejector pin 300 and the catheter 100 forms a rounded shape, thereby avoiding scratching the closed end 210 of the catheter 100.

[0033] Embodiment 2: This embodiment discloses a coating method for a medical catheter, which specifically uses the turning tool described in Embodiment 1, referring to Figure 4 As shown, the following steps are included: S1. Material preparation: the catheter 100 to be coated, the coating solution, the light curing equipment and the turning tool; S2. Pretreatment: performing physical or chemical pretreatment on the surface of the catheter 100; S3, flipping: the catheter 100 is sleeved onto the core tube 200, and the end is located outside the core tube 200, and then the end is clamped to form a closed end 210; the ejector pin 300 pushes the closed end 210 toward the inside of the core tube 200, and ejects it from the other end of the core tube 200; S4, re-coating: applying the coating solution to the outer surface of the turned-over catheter 100, and checking the coating effect; S5: Curing: Use a light curing device to cure the outer surface of the coating in S4; S6: Restoration of the catheter 100: Use the turning tool to turn the catheter 100 back in the manner of S3.

[0034] In this embodiment, in step S1 , the catheter 100 is quality inspected and cleaned.

[0035] In addition, the coating environment needs to be prepared to ensure that the operating environment is clean and dust-free, and the temperature and humidity are controlled within a range suitable for coating construction to prevent dust in the air from contaminating the coating on the surface of the catheter 100 .

[0036] In this embodiment, an appropriate solvent or cleaning agent may be used to clean the inner and outer surfaces of the catheter 100 to remove oil, dust and other impurities to ensure that the surface of the substrate is clean.

[0037] Preferably, in step S2, the outer surface of the catheter 100 may be pre-treated by grinding or chemical etching to enhance the adhesion of the coating and make subsequent coating easier.

[0038] In this embodiment, in order to ensure the consistency of the thickness of the coating, in step S4, the coating method can be spraying or dipping.

[0039] This coating method can evenly adhere the coating material to the outer surface of the catheter 100, ensure that the coating thickness meets the design requirements, and minimize the generation of bubbles and pinholes.

[0040] In other embodiments, other coating methods may also be used to meet the design requirements of the coating.

[0041] After coating, check whether the coating is evenly distributed and repair any uneven or defective areas.

[0042] In step S3, the turning process from one end of the catheter 100 to the other end can be performed manually or with the help of equipment at a slower uniform speed to ensure that the turning action is smooth and controllable to ensure the turning effect and avoid excessive stretching or twisting of the catheter 100.

[0043] In step S5, the curing method can be selected from hot air drying or UV light, and the time and temperature parameters are set according to different coating materials. At the same time, the entire curing process is monitored to ensure that the coating is completely cured and achieves the expected performance.

[0044] Step S6: After the catheter 100 is restored, a final inspection is performed on the coatings on the inner and outer surfaces of the catheter 100 to ensure that all indicators of the coatings meet standard requirements.

[0045] The catheter 100 that meets the requirements of the final inspection can be post-processed or directly packaged as a finished product.

[0046] Embodiment 3: This embodiment is an improvement made on the basis of Embodiment 2, and aims to form a medical catheter 100 with coatings on both the inner wall and the outer wall. The specific implementation method is as follows: Between step S2 and step S3, a coating operation of step S4 and a curing operation of step S5 are added.

[0047] Specific reference Figure 5 As shown, that is, after the pretreatment of the catheter 100 is completed, the coating solution is first applied to the outer surface of the catheter 100, and the coating effect is checked; After the inspection is completed, the coating on the outer surface of the catheter 100 is cured using a light curing device.

[0048] Based on the above arrangement, when the catheter 100 is finally restored, a catheter 100 with coatings on both the inner and outer walls can be obtained, meeting the requirements for use of medical devices.

[0049] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A turning tool for coating a medical catheter (100), characterized in that: It comprises a core tube (200) whose interior is hollow and forms a turning cavity (201), and a ejector pin (300) capable of extending into the core tube (200); the core tube (200) can extend into the interior of the catheter (100).

2. The turning tool according to claim 1, characterized in that: The inner diameter of the turning cavity (201) is greater than the diameter of the ejector pin (300).

3. The turning tool according to claim 2, characterized in that: An annular gap is formed between the inner wall of the turnover cavity (201) and the outer wall of the ejector pin (300), and the catheter (100) can pass through the annular gap.

4. The turning tool according to claim 1, characterized in that: The head of the ejector pin (300) is configured as an arc-shaped ejector surface.

5. A method for coating a medical catheter, using the turning tool according to claim 1, characterized in that: The following steps are included: S1. Material preparation: catheter (100) to be coated, coating solution, light curing equipment and turning tooling; S2. Pretreatment: performing physical or chemical pretreatment on the surface of the catheter (100); S3, flipping: the catheter (100) is sleeved onto the core tube (200), and after the end portion is located outside the core tube (200), the end portion is clamped to form a closed end (210); the ejector pin (300) pushes the closed end (210) toward the inside of the core tube (200) and ejects it from the other end of the core tube (200); S4, coating: applying the coating solution to the outer surface of the turned-over catheter (100), and checking the coating effect; S5: Curing: Use a light curing device to cure the outer surface of the coating in S4; S6: Restoration of the catheter (100): Using a turning tool, the catheter (100) is turned back in the manner of S3.

6. The medical catheter coating method according to claim 5, characterized in that: In step S1, the catheter (100) is quality inspected and cleaned.

7. The medical catheter coating method according to claim 5, characterized in that: In step S4, the coating method may be spray coating or dipping coating.

8. The medical catheter coating method according to any one of claims 5 to 7, characterized in that: Between step S2 and step S3, a coating operation of step S4 and a curing operation of step S5 are added.

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