Coating liquid conveying device for coating support in partition mode
By alternating protection with balloon catheters and external protective tubes, combined with a coating fluid supply system, the inner and outer walls of the vascular stent are coated in sections, solving the problem of cross-contamination of the coating, ensuring the uniformity and integrity of the coating, and improving the function and safety of the stent.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-05
- Publication Date
- 2026-03-20
AI Technical Summary
Existing coating methods cannot achieve precise coating of the inner and outer walls of vascular stents separately, which can easily lead to cross-contamination or incomplete coverage, affecting stent function and safety.
The stent employs an alternating protection method using a balloon catheter and an external protective tube. The expansion and contraction of the balloon catheter are controlled by a balloon pressure controller. Combined with a coating liquid supply and delivery unit and a dispensing valve, physical isolation between the inner and outer walls of the stent is achieved, and different coating liquids are delivered for precise spraying.
Precise coatings were applied to the inner and outer walls of the stent, avoiding cross-contamination, ensuring the uniformity and integrity of the coating, and improving the function and safety of the stent.
Smart Images
Figure CN224008544U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of conveying device technology, and in particular to a coating liquid transport device for applying coating liquid to a support in sections. Background Technology
[0002] In the treatment of cardiovascular and peripheral vascular diseases and stents, cardiovascular disease is one of the leading causes of death worldwide. In percutaneous endovascular intervention, stent implantation is a core technique. Traditional metallic stents (such as 316L stainless steel and cobalt-chromium alloys) pose long-term risks, including permanent presence in the body, potential late-stage thrombosis and restenosis, and impaired hemodynamics, hindering normal vascular contraction and relaxation. Currently, stent fabrication often involves surface coating to impart specific biological functions; for example, the inner wall in contact with blood requires anticoagulation, while the outer wall in contact with the vessel wall requires anti-proliferation and anti-endothelialization properties. As an emerging vascular implantation device, the surface coating process of magnesium alloy biodegradable stents is particularly important. Current coating methods do not allow for the precise application of different coatings to the inner and outer walls of stents, especially for stents with different functional requirements (e.g., the outer layer needs to prevent tissue adhesion, while the inner layer needs to prevent coagulation). Conventional coating processes are prone to cross-contamination or incomplete coverage, failing to achieve zoned coating and increasing the stent diameter due to multiple coatings, which can further affect hemodynamics, blood flow, and even cause blockage, thus impacting stent function and safety. Therefore, a specialized device is needed to achieve separate coating of the inner and outer walls of stents. Summary of the Invention
[0003] This invention addresses the problems of existing technologies by providing a coating liquid transport device for partitioned coating of stents. The device features a novel structure and achieves physical isolation between the inner and outer walls of the stent through alternating protection by a balloon catheter and an external protective tube. It also pumps out different coating liquids, enabling precise spraying of different coating liquids separately, avoiding cross-contamination, and ensuring the uniformity and integrity of the coating.
[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0005] The utility model provides a kind of coating liquid transport device for partition coating of support, it includes balloon catheter, balloon pressure controller and the coating delivery mechanism for coating balloon, the balloon pressure controller is connected with the balloon catheter, the balloon catheter is used to load the vascular stent needing coating, the balloon pressure controller is used to drive the balloon catheter to swell and shrink, the coating delivery mechanism includes coating area hose, hose connector, gas-liquid pump and coating liquid supply delivery unit, the output of the coating liquid supply delivery unit is connected with the input of the gas-liquid pump, the output of the gas-liquid pump is communicated with one end of the coating area hose by the hose connector, the other end of the coating area hose is open end, the other end of the coating area hose is used for inserting or taking out the balloon catheter loaded with vascular stent;
[0006] The coating liquid supply delivery unit includes a gas-liquid control area, a gas pump, a distribution valve, and a plurality of coating liquid tanks for storing different coating liquids. The coating liquid tanks are connected to the gas-liquid pump through corresponding pipelines. The distribution valve is arranged on the pipeline between the gas pump and the coating liquid tanks. The gas pump is used to provide gas pressure to enter the corresponding coating liquid tank through the distribution valve to pump the corresponding coating liquid into the gas-liquid control area. The gas-liquid pump is used to pump the coating liquid in the gas-liquid control area into the coating area hose.
[0007] The coating area hose and the hose connector are detachably connected.
[0008] The coating liquid transport device further includes a recovery unit, which includes a recovery tank and a recovery pump. The recovery tank is located below the other end of the coating area hose. The recovery pump is used to pump the liquid in the recovery tank back into the coating liquid tank through the distribution valve.
[0009] The plurality of coating liquid tanks are arranged in a stacked manner.
[0010] The gas-liquid control area is provided with a plurality of control switch valves, and the plurality of control switch valves correspond one-to-one to the plurality of coating liquid tanks.
[0011] The utility model has the advantages of:
[0012] This utility model features a novel structure and ingenious design. During operation, a balloon catheter carries the vascular stent to be coated. A balloon pressure controller controls the internal pressure of the balloon catheter, causing it to expand or contract, thereby altering the state of the vascular stent. When coating is required, the balloon catheter is passed through the center of the stent. The balloon pressure controller initially inflates the balloon catheter, causing slight expansion and fixing the stent's position. At this time, the outer wall of the balloon catheter adheres to the inner wall of the stent, protecting the inner wall of the vascular stent from contact with the coating liquid. Then, the coating liquid supply and delivery unit is activated, opening the corresponding coating liquid tank. This allows the air pump to input the corresponding coating liquid tank via a dispensing valve, pumping the corresponding coating liquid into the gas-liquid control area. The gas-liquid pump then pumps the coating liquid from the gas-liquid control area into the coating area tubing, flushing it onto the outer wall of the vascular stent, completing the coating process. Next, stent expansion and balloon catheter withdrawal are performed: the balloon catheter is inflated a second time, causing slight expansion of the stent and temporary support against the inner wall of an outer protective tube. The balloon catheter is then deflated and withdrawn from the stent. Next, the inner wall of the stent is coated. After the balloon catheter is removed, the stent is supported by an external protective tube, which protects its outer wall. Then, the coating liquid supply and delivery unit is started to directionally flush the coating liquid onto the inner wall of the stent, completing the coating operation on the inner wall of the stent. After the coating is completed, drying and curing processes can be carried out.
[0013] This invention achieves physical isolation between the inner and outer walls of the stent through alternating protection of the balloon catheter and the external protective tube. At the same time, different coating liquids are pumped out, enabling precise spraying of different coating liquids separately, avoiding cross-contamination, and ensuring the uniformity and integrity of the coating. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of a coating liquid transport device for partitioning a support according to the present invention.
[0015] exist Figure 1 The reference numerals in the figures include:
[0016] 1. Balloon catheter; 2. Balloon pressure controller; 3. Coated area hose; 4. Hose connector; 5. Gas-liquid pump; 6. Gas-liquid control area; 7. Air pump; 8. Dispensing valve; 9. Coated liquid tank; 10. Recovery tank; 11. Recovery pump. Detailed Implementation
[0017] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention. The present invention will be described in detail below with reference to the accompanying drawings.
[0018] A coating liquid transport device for partitioning a support, such as Figure 1As shown, it comprises a balloon catheter 1, a balloon pressure controller 2 connected with the balloon catheter 1, the balloon catheter 1 is used to load a vascular stent which needs to be coated, the balloon pressure controller 2 is used to drive the balloon catheter 1 to expand and shrink, and a coating delivery mechanism for coating the balloon, the coating delivery mechanism comprises a coating area hose 3, a hose connector 4, a gas-liquid pump 5, and a coating liquid supply delivery unit, the output end of the coating liquid supply delivery unit is connected with the input end of the gas-liquid pump 5, the output end of the gas-liquid pump 5 is communicated with one end of the coating area hose 3 through the hose connector 4, the other end of the coating area hose 3 is an open end, and the other end of the coating area hose 3 is used for inserting or taking out the balloon catheter 1 loaded with the vascular stent;
[0019] The coating liquid supply delivery unit comprises a gas-liquid control area 6, a gas pump 7, a distribution valve 8, and a plurality of coating liquid tanks 9 for storing different coating liquids; the coating liquid tanks 9 are connected with the gas-liquid pump 5 through corresponding pipelines, the distribution valve 8 is arranged on the pipeline between the gas pump 7 and the coating liquid tanks 9, the gas pump 7 is used to provide gas pressure into the corresponding coating liquid tank 9 through the distribution valve 8 to pump the corresponding coating liquid into the gas-liquid control area 6, and the gas-liquid pump 5 is used to pump the coating liquid in the gas-liquid control area 6 into the coating area hose 3.
[0020] Specifically, the embodiment structure of the application is novel and ingenious in design, and when working, the balloon catheter 1 carries the vascular stent to be coated; the balloon pressure controller 2 controls the internal pressure of the balloon catheter 1 to make it expand or shrink, so as to change the state of the vascular stent, when the stent needs to be coated, the balloon catheter 1 is passed through the center of the stent, the balloon catheter 1 is initially inflated by the balloon pressure controller 2 to slightly expand and fix the position of the stent, at this time, the outer wall of the balloon catheter 1 is attached to the inner wall of the stent to protect the inner wall of the vascular stent from being contacted by the coating liquid, then the coating liquid supply delivery unit is started, the corresponding coating liquid tank 9 is opened to pass through, so that the gas pump 7 inputs into the corresponding coating liquid tank 9 through the distribution valve 8 to pump the corresponding coating liquid into the gas-liquid control area 6, and the gas-liquid pump 5 is used to pump the coating liquid in the gas-liquid control area 6 into the coating area hose 3 to flush to the outer wall of the vascular stent, and the coating work of the outer wall of the stent is completed. Then the stent is expanded and the balloon catheter 1 is withdrawn: the balloon catheter 1 is inflated again to slightly expand the stent and temporarily support it on the inner wall of an outer protection tube, then the balloon catheter 1 is deflated and withdrawn from the inside of the stent. Then the inner wall of the stent is coated, after the balloon catheter 1 is withdrawn, the stent is supported and protected by the outer protection tube, then the coating liquid supply delivery unit is started again to direct the coating liquid to flush to the inner wall of the stent, and the coating work of the inner wall of the stent is completed; after the coating is completed, drying, curing and other processes can be carried out.
[0021] The physical isolation of the inner wall and the outer wall of the stent is achieved by the alternating protection of the balloon catheter 1 and the external protection tube, so that the precise spraying of different coating liquids can be performed respectively, cross contamination is avoided, and the uniformity and integrity of the coating are ensured.
[0022] The coating delivery mechanism of the embodiment of the present application delivers the coating liquid from the coating liquid supply delivery unit into the coating area hose 3 through the gas-liquid pump 5. After the balloon catheter 1 is inserted into the coating area hose 3, the expanded balloon makes the stent tightly adhere to the inner wall of the hose, and the coating liquid can be uniformly attached to the surface of the stent in the local area, realizing “zoned” coating (i.e., coating is performed only on the balloon expansion site).
[0023] In the embodiment of the present application, the coating area hose 3 is detachably connected with the hose connector 4. Specifically, the coating area hose 3 is detachably connected with the hose connector 4 through a quick connection type or a threaded type, etc., which facilitates the replacement of hoses with different inner diameters or materials to adapt to stents of different specifications, and also facilitates cleaning or maintenance; under the above arrangement, the versatility and adaptability of the device are improved, and the device is suitable for various sizes / types of vascular stents; cleaning and replacement are facilitated, cross contamination is prevented, maintenance costs are reduced, and the service life of the equipment is improved.
[0024] In the embodiment of the present application, the coating liquid transportation device further comprises a recovery unit, the recovery unit comprises a recovery tank 10 and a recovery pump 11, the recovery tank 10 is located below the other end of the coating area hose 3, and the recovery pump 11 is used to pump the liquid in the recovery tank 10 back into the coating liquid tank 9 through the distribution valve 8. Specifically, during the coating process, the excess coating liquid that is not absorbed by the stent flows out of the open end of the coating area hose 3 and falls into the recovery tank 10 below; after the recovery pump 11 is started, the liquid in the recovery tank 10 is selectively sent back to the corresponding coating liquid tank 9 through the distribution valve 8, realizing the recycling of the liquid.
[0025] In the embodiment of the present application, a plurality of coating liquid tanks 9 are arranged in a stacked manner. Specifically, under the above arrangement, a plurality of coating liquid tanks 9 for storing different functional coating liquids are arranged in a stacked manner in the vertical direction, saving horizontal space, and facilitating compact integration through gravity assistance or unified pipeline layout.
[0026] In the embodiment of the present application, a plurality of control switch valves are arranged in the gas-liquid control area 6, and the plurality of control switch valves correspond one-to-one to the plurality of coating liquid tanks 9. Specifically, the gas-liquid control area 6 serves as the temporary storage and distribution center of the coating liquid, and each coating liquid tank 9 corresponds to an independent control switch valve. By opening a specific valve, a certain type of coating liquid can be accurately controlled to enter the gas-liquid pump 5 and then be delivered to the coating area hose 3, realizing zoned coating according to demand, sequence and quantity, and realizing precise switching and combined coating of multi-component coatings.
[0027] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the present application is disclosed as above with the preferred embodiment, it is not intended to limit the present application. Any skilled person in the art can make some changes or modifications to the disclosed technical content without departing from the technical solution of the present application, and any equivalent embodiment with equivalent changes is equivalent to the above embodiment. Any simple modification, equivalent change and modification of the above embodiment according to the present application are within the scope of the technical solution of the present application.
Claims
1. A coating liquid transport device for applying coating liquid to a support in sections, characterized in that: The device includes a balloon catheter, a balloon pressure controller, and a coating delivery mechanism for coating the balloon. The balloon pressure controller is connected to the balloon catheter, which is used to load a vascular stent to be coated. The balloon pressure controller is used to inflate and deflate the balloon catheter. The coating delivery mechanism includes a coating area tubing, a tubing connector, a gas-liquid pump, and a coating fluid supply and delivery unit. The output end of the coating fluid supply and delivery unit is connected to the input end of the gas-liquid pump. The output end of the gas-liquid pump is connected to one end of the coating area tubing through the tubing connector. The other end of the coating area tubing is an open end, used for inserting or removing the balloon catheter loaded with the vascular stent. The coating liquid supply and delivery unit includes a gas-liquid control area, a gas pump, a dispensing valve, and multiple coating liquid tanks for storing different coating liquids. The coating liquid tanks are connected to the gas-liquid pump through corresponding pipelines. The dispensing valve is located on the pipeline between the gas pump and the coating liquid tank. The gas pump is used to provide air pressure to enter the corresponding coating liquid tank through the dispensing valve and pump the corresponding coating liquid into the gas-liquid control area. The gas-liquid pump is used to pump the coating liquid in the gas-liquid control area into the coating area hose.
2. The coating liquid transport device for partitioning a support according to claim 1, characterized in that: The coated area hose is detachably connected to the hose connector.
3. The coating liquid transport device for partitioning a support according to claim 1, characterized in that: The coating liquid transport device also includes a recovery unit, which includes a recovery tank and a recovery pump. The recovery tank is located below the other end of the coating area hose, and the recovery pump is used to pump the liquid in the recovery tank back to the coating liquid tank via the liquid distribution valve.
4. The coating liquid transport device for partitioning a support according to claim 1, characterized in that: The multiple coating liquid tanks are arranged in a stacked manner.
5. A coating liquid transport device for partitioning a support according to claim 1, characterized in that: The gas-liquid control zone is equipped with multiple control switch valves, and each of the multiple control switch valves corresponds to one of the multiple coating liquid tanks.