Medical thin-walled tube preparation system and method

Abstract

The invention discloses a medical thin-walled tube preparation system and method. The preparation system comprises a dipping blade coating assembly, a winding and unwinding assembly, a cleaning assembly and a sintering assembly. The preparation method comprises the steps that a substrate enters the cleaning tank through the unwinding device to complete the cleaning process, then sequentially penetrates through the liquid storage mold, the lower mold, the blade coating mold and the upper mold to complete the dipping and blade coating process, then enters the sintering assembly to complete the sintering process, and finally a product is cleaned and wound. The limiting molds symmetrically arranged at the top end and the bottom end of the blade coating mold can adjust the spatial position of the blade coating mold, the liquid storage mold is arranged below the limiting molds and can collect and quantitatively supplement impregnation liquid, and the columnar base sequentially penetrates through the liquid storage mold, the limiting molds and the blade coating mold to complete the impregnation and blade coating processes. The dipping and blade coating assembly is simple in structure, and thin-walled pipes of different models can be stably prepared by replacing blade coating molds of different hole diameters.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a system and method for preparing a medical thin-walled tube. Background Art

[0002] As a medical consumable, thin-walled tubes are widely used in the fields of minimally invasive surgical instruments, implantable devices, and diagnostic instruments. In order to cope with different usage scenarios, not only are there strict requirements on the corrosion resistance and biocompatibility of the materials used for thin-walled tubes, but there are also strict tolerance restrictions on the dimensional accuracy of the tubes. Dip coating technology (DC) has advantages such as simple operation and easy control of product size, which makes it widely used in coating preparation and surface modification, such as painting, electroplating, thin film preparation, and biomedicine. In the dip coating preparation process of the film, by selecting a suitable substrate and dipping liquid, thin-walled tubes of various materials and sizes can be prepared.

[0003] Existing preparation methods primarily use guide wheels to secure the substrate's position while simultaneously securing the mold on the substrate's central trajectory. Dimensional stability relies heavily on the uniformity of the impregnation liquid. Controlling the viscosity and pulling speed of the impregnation liquid allows for the production of dimensionally uniform coatings. When the impregnation liquid is a low-viscosity fluid, excess fluid naturally flows back into the reservoir. However, when a high-viscosity fluid is used, excess fluid cannot flow back into the reservoir in a timely manner, making it difficult to control the tube's ovality and outer diameter tolerance, severely impacting product yield and production continuity. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a medical thin-wall tube preparation system and method.

[0005] In order to achieve the above objectives, in a first aspect, the present invention provides a medical thin-walled tube preparation system, comprising:

[0006] A dipping and scraping assembly includes symmetrically arranged limiting molds, a scraping mold is arranged between the limiting molds, and a liquid storage mold is arranged below the scraping mold. The substrate passes through the liquid storage mold, the limiting mold and the scraping mold in sequence to complete the dipping and scraping process;

[0007] A reel assembly for unwinding a substrate and rewinding a product;

[0008] a cleaning assembly for cleaning substrates and products;

[0009] A sintering assembly is provided for sintering the impregnated substrate.

[0010] In some embodiments, the limiting mold includes a symmetrically arranged upper mold and a lower mold, a first through-hole is opened in the middle of the limiting mold, an inflation cavity is opened outside the first through-hole, a plurality of groups of blowing holes are symmetrically opened at the bottom of the inflation cavity, a first threaded hole is opened on one side of the inflation cavity, and the first threaded hole is used to connect the air supply end.

[0011] In some embodiments, the coating mold is symmetrically provided with extensions along its edge, an immersion cavity is provided in the middle of the coating mold, a first countersunk groove is provided at the top of the immersion cavity, and a second countersunk groove is provided at the bottom of the immersion cavity.

[0012] In some embodiments, the impregnation chamber is hollow cylindrical, the first countersunk groove and the second countersunk groove are funnel-shaped, the diameter of the first countersunk groove is larger than that of the second countersunk groove, and the slope of the first countersunk groove is larger than that of the second countersunk groove.

[0013] In some embodiments, a liquid storage cavity is provided in the middle of the liquid storage mold, second through holes are symmetrically provided at the top and bottom ends of the liquid storage cavity, a collection hole is provided at the top of the liquid storage mold, and a second threaded hole is provided on the side of the liquid storage cavity, and the second threaded hole is used to connect the liquid supply end.

[0014] In some embodiments, the diameters of the first through-hole of the limiting mold and the second through-hole of the liquid storage mold are larger than the diameter of the dipping cavity of the coating mold, and the diameter of the dipping cavity of the coating mold is larger than the diameter of the substrate.

[0015] In some embodiments, the unwinding and rewinding assembly includes an unwinding roller, a winding roller and a guide wheel group, the cleaning assembly includes a first cleaning tank and a second cleaning tank, the sintering assembly includes a sintering furnace, the unwinding roller is arranged at the front end of the first cleaning tank, the winding roller is arranged at the rear end of the second cleaning tank, a first guide wheel is arranged between the first cleaning tank and the scraping assembly, and a second guide wheel is arranged between the sintering furnace and the second cleaning tank.

[0016] In some embodiments, a common tangent plane exists between the unwinding roller, the winding roller and the guide wheel, and the tangent direction at the tangent point between the unwinding roller, the winding roller and the guide wheel is consistent with the film material conveying direction.

[0017] In a second aspect, the present invention further provides a method for preparing a medical thin-walled tube, which is performed by the medical thin-walled tube preparation system as described in the first aspect, and the preparation method comprises:

[0018] S100, the unwinding roller unwinds the cylindrical substrate into the first cleaning tank to complete the cleaning process, and then passes through the first guide wheel into the liquid storage mold;

[0019] S200, the columnar substrate passes through the liquid storage mold, the lower mold, the doctor blade mold and the upper mold in sequence to complete the dipping and doctor blade coating process;

[0020] S300: The columnar substrate enters the sintering furnace to complete the sintering process, passes through the first guide wheel to enter the second cleaning tank to complete the cleaning process, and the winding roller winds up the formed product.

[0021] In some embodiments, the S200 includes:

[0022] S210, adjusting the opening of the air supply end control valve to control the coating mold to be suspended between the upper mold and the lower mold;

[0023] S220, adjusting the opening of the control valve at the liquid supply end to control the liquid level in the liquid storage cavity of the liquid storage mold to remain constant.

[0024] The present invention has the following beneficial effects:

[0025] 1. In the present invention, the limiting molds symmetrically arranged at the top and bottom of the scraping mold can adjust the position of the scraping mold. A liquid storage mold is provided below the limiting mold to collect and quantitatively replenish the dipping liquid. The columnar substrate passes through the liquid storage mold, the limiting mold, and the scraping mold in sequence to complete the dipping and scraping process. The dipping and scraping assembly has a simple structure and can stably produce thin-walled tubes of different models by replacing scraping molds with different apertures.

[0026] 2. In the present invention, the limiting mold is evenly distributed with blowing holes. During operation, a vertical airflow can be generated through the air supply end. By adjusting the size of the control valve, the scraping mold is suspended between the upper and lower molds, thereby reducing horizontal friction. After the columnar base passes through the liquid storage mold, a large amount of impregnation liquid is attached to the surface. When passing through the scraping mold, the excess impregnation liquid is scraped off. Under the action of the internal pressure of the impregnation liquid, the scraping mold tends to balance the force, thereby achieving self-adjustment and centering, effectively reducing the dimensional tolerance of the thin-walled tube.

[0027] 3. The liquid storage cavity of the liquid storage mold in the present invention can collect the impregnating liquid that has slipped, and a threaded hole is opened on the liquid storage cavity. The solution can be quantitatively replenished through the liquid supply end during operation. By adjusting the size of the control valve, disturbance of the columnar base or introduction of bubbles can be avoided, thereby effectively improving the yield rate of thin-walled tubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of the medical thin-walled tube preparation system proposed in the present invention;

[0029] Figure 2 for Figure 1 Schematic diagram of the structure of the dip coating assembly;

[0030] Figure 3 for Figure 1 Front view of the dip coating assembly;

[0031] Figure 4 for Figure 1 A top view of the dip coating assembly;

[0032] Figure 5 for Figure 4 Cross-sectional view at AA in the middle;

[0033] Figure 6 for Figure 4 Cross-sectional view of the middle limit mold;

[0034] Figure 7 for Figure 4 A cross-sectional view of the middle scraping die;

[0035] Figure 8 for Figure 4 a cross-sectional view of the liquid storage mold;

[0036] Figure 9 Schematic diagram of the process of preparing the medical thin-walled tube proposed by the present invention Figure 1 ;

[0037] Figure 10 Schematic diagram of the process of preparing the medical thin-walled tube proposed by the present invention Figure 2 .

[0038] Legend:

[0039] 1. Dipping and scraping assembly; 11. Positioning mold; 111. Upper mold; 112. Lower mold; 113. First through-hole; 114. Inflating cavity; 115. First threaded hole; 116. Blowing hole; 12. Scraping mold; 121. Extension; 122. Dipping cavity; 123. First countersunk groove; 124. Second countersunk groove; 13. Liquid storage mold; 131. Liquid storage cavity; 132. Second through-hole; 133. Collecting hole; 134. Second threaded hole; 2. Unwinding and rewinding assembly; 21. Unwinding roller; 22. Rewinding roller; 23. Guide wheel group; 231. First guide wheel; 232. Second guide wheel; 3. Cleaning assembly; 31. First cleaning tank; 32. Second cleaning tank; 4. Sintering assembly; 41. Sintering furnace. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] The present invention provides a system and method for preparing medical thin-walled tubes. This solves the problem in the prior art where, when the impregnating liquid used is a high-viscosity fluid, excess impregnating liquid cannot flow back to the reservoir in a timely manner, making the tube's ovality and outer diameter difficult to control, seriously affecting product yield and production continuity. In this application, symmetrically positioned limit molds above and below the coating mold adjust the coating mold's position. A liquid reservoir mold is located below the limit mold to collect and quantitatively replenish the impregnating liquid. The columnar base sequentially passes through the liquid reservoir mold, the limit mold, and the coating mold to complete the dipping and coating process. The dipping and coating assembly has a simple structure, and various types of thin-walled tubes can be stably produced by replacing coating molds with different apertures.

[0042] Please refer to the following examples for details:

[0043] Reference Figures 1-8 The present invention provides an embodiment of a medical thin-walled tube preparation system, the specific structure of which includes: an immersion and coating component 1, a winding and unwinding component 2, a cleaning component 3 and a sintering component 4.

[0044] Among them, the scraping assembly includes symmetrically arranged limiting molds 11, a scraping mold 12 is arranged between the limiting molds 11, and a liquid storage mold 13 is arranged below the scraping mold 12. The substrate passes through the liquid storage mold 13, the limiting mold 11 and the scraping mold 12 in sequence to complete the dipping and scraping process.

[0045] It can be understood that the limiting mold 11 and the liquid storage mold 13 are both fixed, which can form a stable support structure to ensure that the position does not shift during long-term operation; and the limiting mold 11 symmetrically arranged at the top and bottom ends of the scraping mold 12 can make the scraping mold 12 rise and fall when blowing in the vertical direction, and then automatically adjust to a matching spatial position, and a liquid storage mold 13 is arranged under the limiting mold 11 to collect and quantitatively replenish the impregnation liquid. The columnar base passes through the liquid storage mold 13, the limiting mold 11 and the scraping mold 12 in turn to complete the impregnation and scraping process. The impregnation and scraping assembly 1 has a simple structure and can stably prepare thin-walled tubes of different models by quickly replacing scraping molds 12 with different aperture specifications.

[0046] Furthermore, the limiting mold 11 includes a symmetrically arranged upper mold 111 and a lower mold 112, and a first penetration hole 113 is opened in the middle of the limiting mold 11 for penetrating into or out of the base; and an inflation cavity 114 is opened outside the first penetration hole 113, and the cross-section of the inflation cavity 114 is rectangular, ensuring the sealing and reliability of the connection; and a plurality of groups of blowing holes 116 are symmetrically opened at the bottom of the inflation cavity 114, for uniformly spraying gas in a vertical direction; and a first threaded hole 115 is opened on one side of the inflation cavity 114, for connecting to an external air supply end through components such as quick connectors.

[0047] Specifically, the edge of the scraping mold 12 is symmetrically provided with an extension portion 121, which can make the entire scraping mold 12 evenly stressed and suspended between the upper mold 111 and the lower mold 112 when the gas is blown out; and an immersion cavity 122 is provided in the middle of the scraping mold 12, and its inner diameter size can be customized according to different production requirements, which can control the specific size of the formed pipe; correspondingly, a first countersunk groove 123 is provided at the top of the immersion cavity 122, and a second countersunk groove 124 is provided at the bottom of the immersion cavity 122.

[0048] It should be explained in detail that the immersion chamber 122 is in the shape of a hollow column, the diameter of the first countersunk groove 123 is larger than that of the second countersunk groove 124, and its specific size is optimized according to the base diameter and the characteristics of the immersion liquid; and the slope of the first countersunk groove 123 is greater than the slope of the second countersunk groove 124. This design can guide the immersion liquid to flow evenly into the immersion chamber 122, avoiding problems of liquid accumulation or poor flow.

[0049] It is understandable that the diameter of the impregnation cavity 122 determines the specific size of the formed pipe, and whether the columnar base is in the center of the scraping mold 12 determines whether the prepared pipe is eccentric. In this application, the air holes 116 are symmetrically and evenly distributed on the limiting mold 11. During operation, the opening size of the air control valve installed on the air supply pipe can be adjusted to accurately control the pressure and flow of the air flow, so that the scraping mold 12 can be stably suspended between the upper mold 111 and the lower mold 112. This air suspension support method can effectively reduce the friction force on the scraping mold 12 in the horizontal direction; and when the columnar base is impregnated with impregnation liquid and passes through the scraping mold 12, the excess impregnation liquid will be scraped off. Due to the pressure distribution inside the impregnation liquid fluid, when the scraping mold 12 is in an eccentric position, the fluid pressure will differ in different parts of the mold. This pressure difference will prompt the scraping mold 12 to automatically adjust its position until a force balance state is reached, thereby achieving self-adjustment and centering, which can effectively reduce the dimensional tolerance of the thin-walled tube and improve the dimensional accuracy and consistency of the product.

[0050] Furthermore, a liquid storage cavity 131 is provided in the middle of the liquid storage mold 13 for storing the impregnation liquid; and second through holes 132 are symmetrically provided at the top and bottom ends of the liquid storage cavity 131, which can accommodate columnar bases of different specifications; and a collecting hole 133 is provided on the top of the liquid storage mold 13, which can efficiently guide the impregnation liquid that falls back after scraping to flow smoothly into the liquid storage cavity 131, and a second threaded hole 134 is provided on the side of the liquid storage cavity 131. The second threaded hole 134 is used to connect the liquid supply end, and is connected to the external liquid supply end through a high-pressure resistant sealing joint, which ensures the sealing and reliability of the connection while monitoring the liquid level in the liquid storage cavity 131 through components such as liquid level sensors, thereby replenishing the impregnation liquid in real time.

[0051] It should be explained in detail that the diameters of the first hole 113 of the limiting mold 11 and the second hole 132 of the liquid storage mold 13 are larger than the diameter of the impregnation cavity 122 of the scraping mold 12. The diameter of the impregnation cavity 122 of the scraping mold 12 is larger than the diameter of the substrate. This can not only ensure that the surface of the substrate is fully impregnated, but also accurately control the coating thickness through the scraping mold 12 to ensure the uniformity and consistency of the coating.

[0052] It can be understood that after the columnar base is fully immersed in the liquid storage mold 13 and a large amount of impregnation liquid is attached, it is guided into the scraping mold 12 through the limiting mold 11, and the excess impregnation liquid will be accurately scraped off by the scraping mold 12 and fall back downward under the action of gravity; and the liquid storage cavity 131 of the liquid storage mold 13 can collect the slipped impregnation liquid through the collection hole 133 on the top; and a threaded hole is provided on the liquid storage cavity 131. During operation, the opening size of the hydraulic control valve installed on the liquid supply pipeline can be adjusted to accurately control the pressure and flow size of the liquid, and then quantitatively replenish the impregnation liquid, and it can avoid disturbing the columnar base or introducing bubbles, thereby effectively improving the yield rate of thin-walled tubes.

[0053] Please continue reading Figure 1 The unwinding and rewinding assembly 2 includes an unwinding roller 21, a rewinding roller 22 and a guide wheel group 23, which are used to unwind the substrate and rewind the product. It is directly driven by a servo motor and other drive components, and closed-loop control is achieved through a PLC control module; the cleaning assembly 3 includes a first cleaning tank 31 and a second cleaning tank 32, which are used to clean the substrate and the product. Each cleaning tank is provided with a liquid level sensor and an automatic liquid replenishing device to ensure the stability of the liquid level of the cleaning liquid. At the same time, a sewage outlet is provided at the bottom of the cleaning tank to discharge the sediment regularly to ensure the cleanliness of the cleaning liquid; the sintering assembly 4 includes a sintering furnace 41, which is used to sinter the impregnated substrate. The atmosphere in the furnace can be precisely controlled according to the process requirements. Protective gases such as nitrogen and argon can be introduced, and the gas flow is precisely adjusted by a mass flow controller.

[0054] Specifically, the unwinding roller 21 is arranged at the front end of the first cleaning tank 31, and the winding roller 22 is arranged at the rear end of the second cleaning tank 32. A first guide wheel 231 is arranged between the first cleaning tank 31 and the scraping assembly, and a second guide wheel 232 is arranged between the sintering furnace 41 and the second cleaning tank 32.

[0055] It should be noted that there is a common tangent surface between the unwinding roller 21, the winding roller 22 and the guide wheel. The tangent direction at the intersection of the unwinding roller 21, the winding roller 22 and the guide wheel is consistent with the film material conveying direction, ensuring that the tension gradient of each contact point of the substrate during the transmission process is small, avoiding wrinkles or tensile deformation caused by roller position deviation.

[0056] Reference Figure 9-10The present invention further provides an embodiment of a method for preparing a medical thin-walled tube, which is performed by the medical thin-walled tube preparation system as described in the above embodiment. The preparation method includes:

[0057] S100, the unwinding roller 21 unwinds the cylindrical substrate into the first cleaning tank 31 to complete the cleaning process, and then passes through the first guide wheel 231 into the liquid storage mold 13;

[0058] S200, the columnar substrate passes through the liquid storage mold 13, the lower mold 112, the scraping mold 12 and the upper mold 111 in sequence to complete the dipping and scraping process;

[0059] S300, the columnar substrate enters the sintering furnace 41 to complete the sintering process, passes through the first guide wheel 231 to enter the second cleaning tank 32 to complete the cleaning process, and the winding roller 22 winds up the formed product.

[0060] Please continue reading Figure 10 In this embodiment, S200 includes:

[0061] S210, adjusting the opening of the air supply end control valve to control the coating mold 12 to be suspended between the upper mold 111 and the lower mold 112;

[0062] S220, adjusting the opening of the control valve at the liquid supply end to control the liquid level in the liquid storage cavity 131 of the liquid storage mold 13 to remain unchanged.

[0063] For example, the unwinding roller 21 rotates at a constant linear speed, smoothly releasing the coiled cylindrical substrate. The substrate follows a preset guide track into the first cleaning tank 31 to complete the initial cleaning process, removing impurities attached to the surface. The substrate then smoothly enters the liquid storage mold 13 under the precise guidance of the first guide wheel 231.

[0064] After entering the liquid storage mold 13, the columnar substrate is fully immersed in the impregnation liquid in the liquid storage chamber 131 and then passes through the lower mold 112, the scraper mold 12, and the upper mold 111 in sequence. The air supply end control valve is adjusted to stably control the air supply pressure, so that the scraper mold 12 is stably suspended between the upper mold 111 and the lower mold 112, forming a non-contact suspended working state, effectively reducing horizontal friction. At the same time, the liquid supply end control valve is adjusted to stably control the liquid supply pressure, accurately replenishing the consumed liquid storage liquid, so that the liquid level inside the impregnation chamber 122 is maintained constant. During this process, the excess impregnation liquid is scraped off by the scraper mold 12 and slides downward into the liquid storage chamber 131.

[0065] Then, under the guidance of the second guide wheel 232, it enters the sintering furnace 41 at a constant speed. After preheating, sintering, insulation, cooling and other stages, it enters the second cleaning tank 32 through the second guide wheel 232 to further remove residual impurities on the surface. The winding roller 22 winds the cleaned molded products in an orderly manner at a linear speed synchronized with the unwinding roller 21; finally, according to production requirements, the rolled product is cut into a specific length using a cutter, and the columnar base is taken out through a special extraction device, and finally a thin-walled tube product that meets the specifications is obtained.

[0066] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A medical thin-walled tube preparation system, characterized in that: include: A dipping and scraping assembly includes symmetrically arranged limiting molds, a scraping mold is arranged between the limiting molds, and a liquid storage mold is arranged below the scraping mold. The substrate passes through the liquid storage mold, the limiting mold and the scraping mold in sequence to complete the dipping and scraping process; A reel assembly for unwinding a substrate and rewinding a product; a cleaning assembly for cleaning substrates and products; A sintering assembly is provided for sintering the impregnated substrate.

2. The medical thin-walled tube preparation system according to claim 1, characterized in that: The limiting mold includes a symmetrically arranged upper mold and a lower mold, a first through-hole is opened in the middle of the limiting mold, an inflation cavity is opened outside the first through-hole, a plurality of groups of blowing holes are symmetrically opened at the bottom of the inflation cavity, a first threaded hole is opened on one side of the inflation cavity, and the first threaded hole is used to connect the air supply end.

3. The medical thin-walled tube preparation system according to claim 1, characterized in that: The edge of the scraping mold is symmetrically provided with an extension part, the middle part of the scraping mold is provided with an immersion cavity, the top end of the immersion cavity is provided with a first countersunk groove, and the bottom end of the immersion cavity is provided with a second countersunk groove.

4. The medical thin-walled tube preparation system according to claim 3, characterized in that: The impregnation chamber is in the shape of a hollow column, the first countersunk groove and the second countersunk groove are in the shape of a funnel, the diameter of the first countersunk groove is larger than that of the second countersunk groove, and the slope of the first countersunk groove is larger than that of the second countersunk groove.

5. The medical thin-walled tube preparation system according to claim 1, characterized in that: A liquid storage cavity is provided in the middle of the liquid storage mold, and second through holes are symmetrically provided at the top and bottom ends of the liquid storage cavity. A collecting hole is provided at the top of the liquid storage mold, and a second threaded hole is provided on the side of the liquid storage cavity. The second threaded hole is used to connect the liquid supply end.

6. The medical thin-walled tube preparation system according to claim 1, characterized in that: The diameters of the first perforation hole of the limiting mold and the second perforation hole of the liquid storage mold are larger than the diameter of the dipping cavity of the coating mold, and the diameter of the dipping cavity of the coating mold is larger than the diameter of the substrate.

7. The medical thin-walled tube preparation system according to claim 1, characterized in that: The unwinding and rewinding assembly includes an unwinding roller, a winding roller and a guide wheel group, the cleaning assembly includes a first cleaning tank and a second cleaning tank, the sintering assembly includes a sintering furnace, the unwinding roller is arranged at the front end of the first cleaning tank, the winding roller is arranged at the rear end of the second cleaning tank, a first guide wheel is arranged between the first cleaning tank and the scraping assembly, and a second guide wheel is arranged between the sintering furnace and the second cleaning tank.

8. The medical thin-walled tube preparation system according to claim 7, characterized in that: There is a common tangent plane between the unwinding roller, the winding roller and the guide wheel, and the tangent direction at the tangent point between the unwinding roller, the winding roller and the guide wheel is consistent with the film material conveying direction.

9. A method for preparing a medical thin-walled tube, characterized in that: The preparation method is performed by the medical thin-walled tube preparation system according to any one of claims 1 to 8, and the preparation method comprises: S100, the unwinding roller unwinds the cylindrical substrate into the first cleaning tank to complete the cleaning process, and then passes through the first guide wheel into the liquid storage mold; S200, the columnar substrate passes through the liquid storage mold, the lower mold, the doctor blade mold and the upper mold in sequence to complete the dipping and doctor blade coating process; S300: The columnar substrate enters the sintering furnace to complete the sintering process, passes through the first guide wheel to enter the second cleaning tank to complete the cleaning process, and the winding roller winds up the formed product.

10. The method for preparing a medical thin-walled tube according to claim 9, characterized in that: The S200 includes: S210, adjusting the opening of the air supply end control valve to control the coating mold to be suspended between the upper mold and the lower mold; S220, adjusting the opening of the control valve at the liquid supply end to control the liquid level in the liquid storage cavity of the liquid storage mold to remain constant.

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