Covered stent dip-coating device

Abstract

The covered stent dip-coating device comprises a bin body, a dip-coating bin, a pre-curing bin and a curing bin are sequentially arranged in the bin body from front to back, and a first movable partition plate and a second movable partition plate are correspondingly arranged between the dip-coating bin and the pre-curing bin and between the pre-curing bin and the curing bin respectively. A front bin door and a rear bin door which can be opened and closed are correspondingly arranged on the front side wall and the rear side wall of the bin body, a first translation mechanism and a second translation mechanism are arranged on the upper portion of the dip-coating bin and the upper portion of the curing bin respectively, and a first rotating mechanism, a second rotating mechanism and a third rotating mechanism which are used for clamping and transferring lining rods are correspondingly arranged on the upper portions of the dip-coating bin, the pre-curing bin and the curing bin. The first translation mechanism and the second translation mechanism are respectively used for translating the first rotating mechanism and the third rotating mechanism in the front-back direction; clamping mechanisms for clamping lining rods are respectively arranged on the first rotating mechanism, the second rotating mechanism and the third rotating mechanism; and a liftable dip-coating liquid containing mechanism is arranged at the bottom of the dip-coating bin. The dip-coating device has the advantages of being high in automation degree, good in dip-coating film covering effect, high in production efficiency and good in safety.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a stent graft dipping device. Background Art

[0002] In medicine, a stent is a medical device that, after expansion, provides mechanical support to maintain or restore lumen patency and / or integrity. It is used to dilate stenosis in blood vessels and non-vascular areas such as the esophagus, bile duct, airway, and intestines, or to reshape lumen structure and / or function. Stent types primarily include metal stents, drug-coated stents, biodegradable stents, and radioactive stents.

[0003] Covered stents are a type of metal stent. The cover provides core functions within the stent, including mechanical support, biological barrier, anti-proliferation, healing promotion, and fluid optimization. It is a key component in achieving minimally invasive treatment and long-term efficacy. Covering materials include ePTFE, polyurethane, and PET. ePTFE and PET are typically sewn together to the stent wire, while polyurethane is typically attached to the wire by spraying, laminating, or dipping.

[0004] The spray coating process uses high-pressure equipment to atomize a polyurethane coating liquid, which is then evenly applied to the stent surface. Its main advantages are its adaptability, ability to cover flat, curved, and irregularly shaped surfaces, uniform and easily controllable film thickness, seamlessness, high adhesion, and a high degree of automation. Various spray coating equipment is commercially available. However, its disadvantages include waste of coating material, specific requirements for the viscosity and concentration of the coating liquid, environmental sensitivity, and the need for strict control of temperature, humidity, and operating parameters to prevent bubbles and delamination. Furthermore, the equipment cost is high.

[0005] The lamination process combines a prefabricated polyurethane film with the stent through heat pressing. Its main advantages are excellent mechanical properties, stability, and process controllability. However, its disadvantages include high equipment requirements, high initial investment, limited flexibility, suitability for specific geometries, and high adjustment costs. Improper processing can lead to stress concentration between the film and the stent.

[0006] The dip coating process involves immersing the stent in a polyurethane solution, lifting it out, and then heating and curing it into a film. It is suitable for coating stents with simple geometric shapes. Its main advantages include good permeability, allowing the solution to penetrate deep into the stent pores, improving sealing, and easy control of process parameters. However, its disadvantages primarily lie in the low degree of automation and production efficiency of existing stent-coated dip coating equipment, poor stent coating uniformity, easy accumulation of material at the edges, and a lengthy initial process parameter exploration process. Furthermore, there are issues such as high consumption of coating solution, high volatility, and health risks to operators. Summary of the Invention

[0007] The present invention provides a stent graft dip coating device, aiming to overcome the above-mentioned many deficiencies existing in the prior art when the stent is dip coated.

[0008] The technical solution of the present invention to solve the above technical problems is as follows: a coating device for a stent graft comprises a warehouse body, wherein a coating warehouse, a pre-consolidation warehouse and a curing warehouse are sequentially arranged in the warehouse body from front to back, and movable partitions 1 and 2 are respectively provided between the coating warehouse and the pre-consolidation warehouse and between the pre-consolidation warehouse and the curing warehouse, and the front and rear warehouse doors that can be opened and closed are respectively provided on the front side wall and the rear side wall of the warehouse body, and the upper parts of the coating warehouse and the curing warehouse are respectively provided with a first translation mechanism and a second translation mechanism, and the upper parts of the coating warehouse, the pre-consolidation warehouse and the curing warehouse are also correspondingly provided with a first rotating mechanism, a second rotating mechanism and a The third rotating mechanism, the lining rod is provided with a bracket to be dipped, the first translation mechanism and the second translation mechanism are respectively used to make the first rotating mechanism and the third rotating mechanism translate in the front and rear directions, the first rotating mechanism, the second rotating mechanism and the third rotating mechanism are respectively provided with a clamping mechanism for clamping the lining rod, the adjacent clamping mechanisms are staggered in the vertical direction and the clamping mechanism located at the rear can remove the lining rod from the clamping mechanism in the front, the bottom of the dipping chamber is provided with a liftable dipping liquid containing mechanism, and the pre-curing chamber and the curing chamber are correspondingly provided with a first heating module and a second heating module.

[0009] On the basis of the above technical solution, the present invention can also be improved as follows.

[0010] Furthermore, the dipping chamber and the curing chamber are respectively connected to the exhaust gas exhaust pipe.

[0011] Furthermore, a fan module is also provided in the curing chamber.

[0012] The cam is connected to the drive means of the second transmission mechanism, and the cam is connected to the drive means of the second transmission mechanism, and the cam is connected to the drive means of the second transmission mechanism, and the cam is connected to the drive means of the second transmission mechanism.

[0013] Furthermore, the clamping mechanism includes a horizontally arranged long strip clamping plate, and long strip clamping grooves are respectively opened at both ends of the clamping plate. Conical upper bosses and lower bosses are arranged at intervals on the upper part of the lining rod. The tail end of the clamping groove is provided with a conical groove for the upper boss or the lower boss to be placed in. The midpoint of the upper surface of the clamping plate is fixedly connected to the lower end of the rotating shaft.

[0014] Furthermore, the two ends of the horizontal rod are respectively connected to the first electric push rod through a vertically arranged connecting rod. The first electric push rod is fixed on the left and right side walls of the warehouse body. When the first electric push rod is extended or retracted, it drives the horizontal rod to move up and down in the vertical direction.

[0015] Furthermore, the dipping liquid holding mechanism includes a support plate, a holding tube and a second electric push rod. A slot is provided on the support plate. The upper end of the holding tube is open and is engaged in the slot. The second electric push rod is located below the support plate and is fixedly connected to the warehouse body. The telescopic end of the second electric push rod is fixedly connected to the bottom of the support plate and can make the support plate move up and down in the vertical direction.

[0016] Furthermore, a cover plate is provided on the upper surface of the support plate. After the containing tube is inserted into the slot, the upper opening is flush with or lower than the upper surface of the support plate. The cover plate is driven by an electric mechanism to close or open the upper opening of the containing tube.

[0017] Furthermore, it also includes a third electric push rod and a fourth electric push rod fixedly connected to the bottom of the warehouse body, the telescopic end of the third electric push rod is fixedly connected to the bottom of the upper partition one, and the telescopic end of the fourth electric push rod is fixedly connected to the bottom of the upper partition two.

[0018] Furthermore, the warehouse body includes an upper warehouse body and a lower warehouse body, the upper warehouse body is located on the upper part of the lower warehouse body and the four side walls and the top wall are made of transparent double-layer organic glass, the lower warehouse body is made of hard plastic or metal, the third electric push rod and the fourth electric push rod are both located in the lower warehouse body, and the first translation mechanism and the second translation mechanism are both arranged in multiple intervals in the left and right directions.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The dipping device is divided into three chambers from front to back, namely the dipping chamber, the pre-curing chamber and the curing chamber. The dipping chamber is responsible for dipping and leveling at room temperature, and the pre-curing chamber is responsible for pre-curing of the dipping liquid, so that the dipping liquid quickly reaches a non-flowing state. During leveling and pre-curing, the dipping chamber and the pre-curing chamber do not have or turn on fans or other components that generate airflow disturbances and affect the leveling effect. The stent coating formed by leveling and pre-curing has good uniformity. The curing chamber uses the dual effects of heat and wind to quickly cure the pre-cured coating and discharge the waste gas to prevent operators from inhaling harmful gases. The movement of partition one and partition two allows adjacent chambers to be connected to transfer materials, and to be isolated from each other to independently realize their functions. The coordinated cooperation can effectively improve the production efficiency of stent coating.

[0021] 2. The dipping coating device has a high degree of automation and good dipping coating effect. The operator only needs to place the dipping liquid holding tube in front of the warehouse, place the lining rod and take out the lining rod at the back of the warehouse. The rest can be completed automatically by the equipment.

[0022] 3. Good safety. During the stent coating process, the operator only needs to open the door of the dipping chamber, put his hand into the chamber, and place the dipping liquid holding tube and lining rod under visibility outside the chamber. The volatile organic solvent in the dipping chamber is taken away by the exhaust gas exhaust pipe, preventing the operator from inhaling toxic and harmful organic gases. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 An axonometric view of a stent graft dipping device provided by the present invention (without the top cover shown);

[0024] Figure 2 for Figure 1 A top view of the dip coating apparatus shown;

[0025] Figure 3 for Figure 1 An axonometric view of the internal structure of the dipping device shown;

[0026] Figure 4 for Figure 1 An axonometric view of the dipping device with partitions 1 and 2 fully raised and without showing the translational and rotational mechanisms;

[0027] Figure 5 for Figure 4 a top view of the structure shown;

[0028] Figure 6 for Figure 4 A cross-sectional view of the coating liquid holding mechanism at the bottom of the coating chamber along line AA in the illustrated structure (the second electric push rod is not shown);

[0029] Figure 7 for Figure 1 A schematic diagram of the dipping device shown, in which the second to fourth electric push rods are located under the upper bin body and are used to respectively drive the support plate, the first partition and the second partition to move up and down;

[0030] Figure 8 for Figure 3 A schematic diagram of the first rotating mechanism;

[0031] Figure 9 for Figure 8 A left side view of the first rotating mechanism shown;

[0032] Figure 10 for Figure 9 A cross-sectional view of the first rotating mechanism along line BB is shown;

[0033] Figure 11 for Figure 9 A top view of the splint in the first rotating mechanism.

[0034] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0035] 1. Warehouse body; 2. Dipping chamber; 3. Pre-curing chamber; 4. Curing chamber; 5. Partition 1; 6. Partition 2; 7. Front chamber door; 8. Rear chamber door; 9. Liner rod; 10. First heating module; 11. Second heating module; 12. Exhaust gas exhaust pipe; 13. Screw; 14. Seat plate; 15. Translation motor; 16. Nut; 17. Limit plate; 18. Guide light rod; 19. Rotating motor; 20. Rotating shaft; 21. Horizontal rod; 22. Clamping plate; 23. Clamping groove; 24. Upper boss; 25. Lower boss; 26. Groove; 27. First electric push rod; 28. Support plate; 29. Container tube; 30. Second electric push rod; 31. Slot; 32. Cover plate; 33. Third electric push rod; 34. Fourth electric push rod. DETAILED DESCRIPTION

[0036] The principles and features of the present invention are described below with reference to the accompanying drawings and specific embodiments. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0037] In the description of the present invention, if terms indicating directions such as "up", "down", "left", "right", "top", "bottom", "inside" and "outside" are used, the directions or positional relationships indicated are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0038] like Figures 1 to 11 As shown, the present invention provides a stent graft dipping device, which includes a warehouse body 1, in which a dipping chamber 2, a pre-consolidation chamber 3 and a curing chamber 4 are sequentially arranged from front to back in the warehouse body 1, and movable partitions 1 5 and 2 6 are respectively provided between the dipping chamber 2 and the pre-consolidation chamber 3 and between the pre-consolidation chamber 3 and the curing chamber 4, and the front side wall and the rear side wall of the warehouse body 1 are respectively provided with a front chamber door 7 and a rear chamber door 8 that can be opened and closed, and the upper parts of the dipping chamber 2 and the curing chamber 4 are respectively provided with a first translation mechanism and a second translation mechanism, and the upper parts of the dipping chamber 2, the pre-consolidation chamber 3 and the curing chamber 4 are also correspondingly provided with a first rotating mechanism, a second rotating mechanism and a The third rotating mechanism, the lining rod 9 is provided with a bracket to be dipped, the first translation mechanism and the second translation mechanism are respectively used to make the first rotating mechanism and the third rotating mechanism translate in the front and rear directions, the first rotating mechanism, the second rotating mechanism and the third rotating mechanism are respectively provided with a clamping mechanism for clamping the lining rod 9, the adjacent clamping mechanisms are staggered in the vertical direction and the clamping mechanism located at the rear can remove the lining rod 9 from the clamping mechanism in the front, the bottom of the dipping chamber 2 is provided with a liftable dipping liquid containing mechanism, and the pre-curing chamber 3 and the curing chamber 4 are correspondingly provided with a first heating module 10 and a second heating module 11.

[0039] It should be noted that the dipping chamber is mainly used for dipping the bracket to be dipped. The dipping liquid holding mechanism that can be raised and lowered at the bottom corresponds to the lining rod clamped on the clamping mechanism connected to the first rotating mechanism above. After the dipping liquid holding mechanism rises, the lining rod will be immersed in the dipping liquid. Then the dipping liquid holding mechanism descends, and the lining rod is pulled out of the dipping liquid. During leveling, the dipping liquid dripping down from the bracket and the lining rod will enter the dipping liquid holding mechanism again to avoid waste. The bracket to be dipped that is detachably mounted on the lining rod completes automatic dipping and preliminary leveling and film formation in the above process; the first translation mechanism is used to realize the movement of the entire first rotating mechanism in the front and rear directions, so that the bracket after dipped moves in the front and rear directions in the bin with the lining rod, thereby realizing the automatic transfer of the bracket from the dipping chamber to the pre-consolidation chamber.

[0040] The pre-solidification chamber is mainly used for the pre-solidification of the coating liquid, so that the coating liquid on the bracket and the lining rod can be effectively pre-solidified before entering the curing chamber, so that the coating liquid film on the bracket is basically in a stopped flow state; the cooperation of the second rotating mechanism, the second translation mechanism and the third rotating mechanism can transfer the lining rod and the bracket from the pre-solidification chamber to the curing chamber. Heating modules are set in the pre-solidification chamber and the curing chamber to accelerate the pre-solidification and curing of the coating liquid; there is no fan in the pre-solidification chamber and it is not connected with the two adjacent chambers during the pre-curing process to ensure that there is no airflow disturbance, because the flow of air will interfere with the leveling of the coating solution. When partition one and partition two are in the separation position, the three chambers (dipping chamber, pre-solidification chamber and curing chamber) are independent of each other and work independently without interfering with each other.

[0041] The curing chamber is mainly used for the complete curing of the coating liquid. In addition to being equipped with a heating module, the chamber can also be equipped with a fan module to increase the curing speed of the coating liquid (when the bracket moves to the curing chamber with the lining rod, the coating liquid on the surface is basically in a semi-cured state, and the disturbance of wind speed will not affect the leveling of the coating liquid); the curing chamber is connected to the exhaust gas extraction pipe to discharge the organic solvent gas generated during the curing process of the coating liquid (generally harmful solvents such as dichloromethane, chloroform, dimethylformamide, tetrahydrofuran, etc.). After extraction, the operator opens the rear door to take the bracket, which can effectively ensure the safety of the workers and avoid attracting harmful organic volatile gases.

[0042] In one embodiment of the present invention, the dipping chamber 2 and the curing chamber 4 are respectively connected to an exhaust gas exhaust pipe 12. The exhaust gas exhaust pipe is connected to the exhaust system or solvent recovery system of the factory.

[0043] It is understandable that the exhaust gas exhaust pipe is provided with an exhaust device, including but not limited to a cross-flow fan.

[0044] In one embodiment of the present invention, a fan module is further provided in the curing chamber 4 .

[0045] It is understandable that the fan module cooperates with the second heating module in the curing chamber to more quickly completely cure the pre-cured film on the surface of the stent, thereby improving the production efficiency of the coated stent.

[0046] In one embodiment of the present invention, Figure 2 and 3As shown, the first translation mechanism and the second translation mechanism respectively include a lead screw 13 extending forward and backward and a seat plate 14 extending left and right, both ends of the seat plate 14 are fixedly connected to the warehouse body 1, one end of the lead screw 13 is rotatably connected to the seat plate 14, and the other end is connected to the output end of the translation motor 15 fixed to the warehouse body 1, and a nut 16 is spirally connected to the lead screw 13. The bottom of the nut 16 is fixedly connected to a limit plate 17 through a connecting piece, and the limit plate 17 is slidably matched with a guide light rod 18 extending forward and backward. Both ends of the guide light rod 18 are fixedly connected to the warehouse body 1 and the seat plate 14. The first rotating mechanism or the third rotating mechanism is fixed to the bottom of the limiting plate 17. The first rotating mechanism, the second rotating mechanism and the third rotating mechanism respectively include a rotating motor 19 and a rotating shaft 20. The rotating motors 19 of the first rotating mechanism and the third rotating mechanism are respectively fixed to the bottom of the corresponding limiting plate 17. The rotating motor 19 of the second rotating mechanism is fixedly connected to a horizontal rod 21 extending left and right through an upper connecting rod. The output shaft of each rotating motor 19 is vertically downward and coaxially fixedly connected to the upper end of the rotating shaft 20. The lower end of the rotating shaft 20 is fixedly connected to the clamping mechanism.

[0047] It should be noted that both the translational and rotational motors are preferably high-precision, code-controllable stepper motors. The translation and rotation of each translational and rotational mechanism are automated through programming. The translational motors, rotational motors, and electric linear actuators shown in the accompanying drawings are schematic diagrams only; those skilled in the art can customize their sizes and models based on actual needs.

[0048] In one embodiment of the present invention, the clamping mechanism includes a horizontally arranged elongated clamping plate 22, each of which is provided with an elongated clamping groove 23 at each end. A conical upper boss 24 and a lower boss 25 are provided at intervals on the upper portion of the backing bar 9. The tail end of the clamping groove 23 is provided with a conical recess 26 for receiving the upper boss 24 or the lower boss 25. The midpoint of the upper surface of the clamping plate 22 is fixedly connected to the lower end of the rotating shaft 20. The ends of the horizontal rod 21 are respectively connected to a first electric push rod 27 via a vertically arranged connecting rod. The first electric push rod 27 is fixedly provided on the left and right side walls of the warehouse body 1. When the first electric push rod 27 is extended or retracted, it drives the horizontal rod 21 to move up and down in the vertical direction.

[0049] It should be noted that there is a height difference in the vertical position of the splints of adjacent clamping mechanisms. When the lining rods and brackets on the splints in the dipping chamber are dipped and left to stand for an appropriate time to complete leveling, the partition is lowered to connect the dipping chamber and the pre-consolidation chamber, and the first rotating mechanism rotates 180 degrees to rotate the lining rods and brackets to the side close to the pre-consolidation chamber and align with one end of the splint in the pre-consolidation chamber. Then the first translation mechanism is started to drive the splint in the dipping chamber to move toward the pre-consolidation chamber (rear), so that the lining rods are pushed into the clamping groove of the pre-consolidation chamber splint, and then the first electric push rod is extended to move the horizontal rod and the splint below it up. After the splint in the pre-consolidation chamber moves up, the lower boss of the lining rod enters the groove of the splint and then continues to move upward to push the lining rod so that the upper boss of the lining rod is out of the groove of the splint of the dipping chamber, and then the first translation mechanism is started again and reversed, driving the splint in the dipping chamber to reset forward. The lining rod is completely detached from the splint of the dipping chamber and smoothly transferred to the splint of the pre-curing chamber. Then the partition one rises to isolate the dipping chamber from the pre-curing chamber, and the first heating module is started to pre-cure the dipping liquid on the surface of the bracket in the pre-curing chamber. After the pre-curing is completed, the partition two is controlled to move down to connect the pre-curing chamber with the curing chamber. Referring to the above-mentioned transfer mechanism of the lining rod in the adjacent chamber, the second rotating mechanism, the third rotating mechanism and the second translation mechanism are used to transfer the lining rod and the bracket after pre-curing to the curing chamber, and the second heating module is started to complete the final curing and molding. Subsequently, the exhaust gas exhaust device connected to the curing chamber is turned on to discharge the toxic and harmful organic gases generated during the curing process. The rear chamber door is opened, the third rotating mechanism rotates 180 degrees and the second translation mechanism drives the lining rod to continue to move backward to approach or extend out of the rear chamber door. The operator can remove the lining rod and the bracket after coating and curing.

[0050] It can be understood that in addition to the clamping mechanism of the above structure, the clamping mechanism can also adopt the method of installing electric claws at both ends of the clamping plate. The electric claws can clamp or release the lining rods. The advantage is that there is no need to set a first electric push rod to drive the horizontal rod to rise and fall, and the process of taking and placing the lining rods between adjacent compartments is simpler. The disadvantage is that the cost of using electric claws is relatively high.

[0051] In one embodiment of the present invention, the dipping liquid holding mechanism includes a support plate 28, a holding tube 29 and a second electric push rod 30. A slot 31 is provided on the support plate 28. The upper end of the holding tube 29 is open and is engaged in the slot 31. The second electric push rod 30 is located below the support plate 28 and is fixedly connected to the warehouse body 1. The telescopic end of the second electric push rod 30 is fixedly connected to the bottom of the support plate 28 and can make the support plate 28 move up and down in the vertical direction.

[0052] It should be noted that if Figure 6 As shown, the holding tube preferably adopts a design with a funnel upper end and a straight tube lower part, which is convenient for liquid addition and positioning, has a small open area, and reduces the volatilization of the solution.

[0053] In one embodiment of the present invention, a cover plate 32 is further provided on the upper surface of the support plate 28. After the containing tube 29 is inserted into the card slot 31, the upper end opening is flush with or lower than the upper surface of the support plate 28. The cover plate 32 is driven by an electric mechanism to close or open the upper end opening of the containing tube 29.

[0054] It should be noted that the automatic cover design allows the coating liquid to be sealed when the coating operation is not in progress, reducing volatilization, avoiding waste of the coating liquid and the health hazards of volatilized organic solvents to workers. Here, the electric mechanism can specifically be an electric push rod or a motor combined with a gear rack structure.

[0055] In one embodiment of the present invention, it also includes a third electric push rod 33 and a fourth electric push rod 34 fixedly connected to the bottom of the warehouse body 1, the telescopic end of the third electric push rod 33 is fixedly connected to the bottom of the upper partition 5, and the telescopic end of the fourth electric push rod 34 is fixedly connected to the bottom of the upper partition 2 6.

[0056] It should be noted that the dipping chamber, pre-curing chamber, and curing chamber are isolated by movable partitions 1 and 2. In this embodiment, partitions 1 and 2 are opened and closed by moving up and down, and the push rods (third and fourth electric push rods) that realize this movement are placed in the lower chamber body; only when the bracket needs to move between adjacent chambers, partition 1 or partition 2 will move down and open. It is understandable that in addition to realizing the connection and isolation between adjacent chambers by lifting and moving, partitions 1 and 2 can also be opened and closed by moving left and right. The specific structure and setting method can be selected by those skilled in the art with reference to the lifting and lowering method, which will not be elaborated here. It is understandable that the first to fourth electric push rods are respectively set to two symmetrically on the left and right, and the two symmetrical electric push rods are lifted and lowered synchronously to realize the lifting and lowering movement of the corresponding components (horizontal rod, support plate, partition 1 and partition 2) in the vertical direction.

[0057] In one embodiment of the present invention, the warehouse body 1 includes an upper warehouse body and a lower warehouse body, the upper warehouse body is located on the upper part of the lower warehouse body and the four side walls and the top wall are made of transparent double-layer organic glass, the lower warehouse body is made of hard plastic or metal, the third electric push rod 33 and the fourth electric push rod 34 are both located in the lower warehouse body, and the first translation mechanism and the second translation mechanism are both arranged in multiple intervals in the left and right directions.

[0058] It should be noted that the cover plate, support plate, partition one and partition two are preferably made of POM material; the container tube is preferably made of quartz material; the outer surface of the upper bin body is made of double-layer organic glass to ensure good thermal insulation, and the remaining amount of the dipping liquid and the movement inside the bin body can be observed in real time.

[0059] The steps of using the stent graft provided by the present invention to dip-coat the stent are briefly described as follows:

[0060] First, open the exhaust function of the exhaust pipe of the dipping chamber and then open the front door (at this time, the rear door is closed, the partition 1 and the partition 2 are raised to the top and aligned with the base plate, and each chamber is relatively independent). The operator places the container containing the dipping liquid in the slot of the pallet (such as Figure 6 At the same time, place the liner rod in the liner rod clamping mechanism of the dipping chamber, close the front chamber door, and turn off the exhaust function;

[0061] Secondly, the second electric push rod 30 starts and pushes the support plate 28 upward, and the container tube 29 moves upward accordingly until it is completely immersed. Figure 3 The lining rod 9 on the middle clamping mechanism is kept for 1-5 minutes, and the telescopic end of the second electric push rod 30 moves downward to return the support plate 28 and the containing tube 29 to the initial state. Figure 3 The middle cover plate is moved to the top of the slot of the support plate under the action of the driving mechanism (electric or pneumatic push rod), so that the coating liquid in the holding tube 29 is in a closed state, and the lining rod 9 is kept at room temperature for 2-8 minutes to allow it to have sufficient time to level;

[0062] Subsequently, the rotating shaft 20 in the dip coating chamber is driven by the rotating motor 19 to rotate 180 degrees, and then Figure 7 The third electric push rod 33 controls the partition 15 to move downward to connect the two chambers of the dipping chamber and the pre-consolidation chamber. Then the translation motor 15 of the first translation mechanism drives the screw 13 to rotate, so that the lining rod clamping mechanism of the dipping chamber moves toward the pre-consolidation chamber until the lining rod is inserted into the clamping groove of the clamping mechanism of the pre-consolidation chamber. Figure 3 The telescopic end of the first electric push rod drives the horizontal rod 21 to move upward until the clamping mechanism of the pre-fixed chamber lifts up the lower boss of the lining rod, so that the upper boss of the lining rod is completely separated from the lining rod clamping mechanism of the dipping chamber, and the translation motor 15 of the first translation mechanism of the dipping chamber is reversed, and the clamping mechanism of the dipping chamber is away from the pre-fixed chamber and reset in the dipping chamber, and then Figure 7 The first electric push rod 27 controls the partition 5 to move upward until it is completely closed, and then the first heating module in the pre-curing chamber is opened to pre-cure the coating liquid on the surface of the liner rod bracket. The pre-curing time is 10-20 minutes.

[0063] Pre-curing is completed. Figure 7The telescopic end of the fourth electric push rod 34 drives the partition 2 6 to move downward, so that the two chambers of the pre-curing bin and the curing bin are connected. The rotating motor in the pre-curing bin rotates 180 degrees, so that the lining rod and its upper bracket are turned toward the curing bin, and then the translation motor 15 of the second translation mechanism in the curing bin rotates, and the third rotating mechanism in the curing bin moves toward the pre-curing bin until the clamping plate of the clamping mechanism of the curing bin clamps the lining rod, and the telescopic end of the first electric push rod 27 moves downward until the lining rod clamping mechanism of the pre-curing bin is completely disengaged from the lower boss of the lining rod. At this time, the clamping mechanism of the curing bin lifts up the upper boss of the lining rod, and the translation motor in the curing bin reverses to move the rotating rod of the curing bin away from the pre-curing bin, and then The telescopic end of the fourth electric push rod 34 moves upward to move the partition plate 2 upward and close it against the seat plate. The curing chamber and the pre-curing chamber are independent of each other. The second heating module and the fan module in the curing chamber are started to accelerate the curing of the coating liquid on the surface of the bracket. The curing time is 30-60 minutes. After the curing is completed, the exhaust pipe of the curing chamber works and exhausts for 5-10 minutes. After the exhaust is completed, the operator opens the rear door and uses the rotating motor of the third rotating mechanism to rotate 180 degrees and the second translation mechanism is started to make the lining rod in the curing chamber close to the rear door or extend from the rear door to the outside of the chamber to facilitate the removal of the lining rod, thus completing the production of a coated bracket. The continuous dipping production of the coated bracket can be achieved by repeating the cycle. In addition, in order to improve efficiency, during continuous production, dipping in the dipping chamber, pre-curing in the pre-curing chamber and curing in the curing chamber can be carried out simultaneously, as long as the time for connecting with each other is calculated. Among them, the longer curing time of the curing chamber is the key decision step. The start time of dipping and pre-curing is determined in advance according to the end time of curing in the curing chamber. Each time curing is completed, a batch of pre-cured brackets are sent into the curing chamber again. The curing chamber is basically in a continuous and uninterrupted working state.

[0064] It should be noted that the bracket is detachably mounted on the lining rod, and can be clamped or hung by a claw-like structure, a protruding structure, etc. set at a specified position of the lining rod. The position of the bracket on the lining rod is preferably a rod section where the thickness of the liquid film formed on the lining rod surface (bracket surface) is relatively uniform after the lining rod is taken out of the dipping liquid and the dipping liquid naturally levels off, thereby ensuring that the thickness of the subsequent coating formed after pre-curing and curing is generally small in difference between the upper and lower ends, and the film thickness is uniform. The film thickness data of the coated bracket prepared by the dipping device provided by the present invention are measured as follows:

[0065]

[0066] Note: Taking a 10*150 stent as an example, the outer diameter of the stent graft is 10mm and the length is 150mm. Use a thickness gauge to measure three points at each end.

[0067] It can be seen from the data in the above table that the film thickness on the surface of the stent graft produced by the stent graft dipping device provided by the present invention is relatively uniform and the quality is good.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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 stent graft dipping device, characterized in that: The invention comprises a warehouse body (1), wherein a dipping warehouse (2), a pre-curing warehouse (3) and a curing warehouse (4) are sequentially arranged in the warehouse body (1) from the front to the back, a movable partition plate (5) and a movable partition plate (6) are respectively arranged between the dipping warehouse (2) and the pre-curing warehouse (3) and between the pre-curing warehouse (3) and the curing warehouse (4), a front warehouse door (7) and a rear warehouse door (8) that can be opened and closed are respectively arranged on the front side wall and the rear side wall of the warehouse body (1), a first translation mechanism and a second translation mechanism are respectively arranged on the upper part of the dipping warehouse (2) and the curing warehouse (4), and a first rotating mechanism and a second rotating mechanism for clamping a transfer backing rod (9) are also correspondingly arranged on the upper part of the dipping warehouse (2), the pre-curing warehouse (3) and the curing warehouse (4). The backing rod (9) is provided with a bracket to be dipped, the first translation mechanism and the second translation mechanism are respectively used to make the first rotation mechanism and the third rotation mechanism translate in the front and rear directions, the first rotation mechanism, the second rotation mechanism and the third rotation mechanism are respectively provided with a clamping mechanism for clamping the backing rod (9), the adjacent clamping mechanisms are staggered in the vertical direction and the clamping mechanism located at the rear can remove the backing rod (9) from the clamping mechanism in the front, the bottom of the dipping chamber (2) is provided with a liftable dipping liquid containing mechanism, and the pre-curing chamber (3) and the curing chamber (4) are respectively provided with a first heating module (10) and a second heating module (11).

2. The stent graft dipping device according to claim 1, characterized in that: The dipping chamber (2) and the curing chamber (4) are respectively connected to the waste gas extraction pipeline (12).

3. The stent graft dipping device according to claim 1, characterized in that: A fan module is also provided in the curing chamber (4).

4. The stent graft dipping device according to claim 1, characterized in that: The first translation mechanism and the second translation mechanism respectively include a lead screw (13) extending forward and backward and a seat plate (14) extending left and right, both ends of the seat plate (14) are fixedly connected to the warehouse body (1), one end of the lead screw (13) is rotatably connected to the seat plate (14), and the other end is connected to the output end of a translation motor (15) fixed on the warehouse body (1), a nut (16) is spirally connected to the lead screw (13), and the bottom of the nut (16) is fixedly connected to a limit plate (17) through a connecting piece, and the limit plate (17) is slidably matched with a guide light rod (18) extending forward and backward, and both ends of the guide light rod (18) are fixedly connected to the warehouse body (1) and the seat plate (14). The first rotating mechanism or the third rotating mechanism is fixed to the bottom of the limiting plate (17), and the first rotating mechanism, the second rotating mechanism and the third rotating mechanism respectively include a rotating motor (19) and a rotating shaft (20). The rotating motors (19) of the first rotating mechanism and the third rotating mechanism are respectively fixed to the bottom of the corresponding limiting plate (17). The rotating motor (19) of the second rotating mechanism is fixedly connected to a horizontal rod (21) extending left and right through an upper connecting rod. The output shaft of each rotating motor (19) is vertically downward and coaxially fixedly connected to the upper end of the rotating shaft (20), and the lower end of the rotating shaft (20) is fixedly connected to the clamping mechanism.

5. The stent graft dipping device according to claim 4, characterized in that: The clamping mechanism includes a horizontally arranged long strip clamping plate (22), and long strip clamping grooves (23) are respectively opened at both ends of the clamping plate (22). Conical upper bosses (24) and lower bosses (25) are arranged at intervals on the upper part of the lining rod (9). The tail end of the clamping groove (23) is provided with a conical groove (26) for the upper boss (24) or the lower boss (25) to be placed. The midpoint of the upper surface of the clamping plate (22) is fixedly connected to the lower end of the rotating shaft (20).

6. The stent graft dipping device according to claim 4, characterized in that: The two ends of the horizontal rod (21) are respectively connected to the first electric push rod (27) through a vertically arranged connecting rod. The first electric push rod (27) is fixed on the left and right side walls of the warehouse body (1). When the first electric push rod (27) is extended or retracted, it drives the horizontal rod (21) to move up and down in the vertical direction.

7. The stent graft dipping device according to claim 1, characterized in that: The coating liquid holding mechanism comprises a support plate (28), a holding tube (29) and a second electric push rod (30); a card slot (31) is provided on the support plate (28); the upper end of the holding tube (29) is open and is engaged in the card slot (31); the second electric push rod (30) is located below the support plate (28) and is fixedly connected to the warehouse body (1); the telescopic end of the second electric push rod (30) is fixedly connected to the bottom of the support plate (28) and can make the support plate (28) move up and down in the vertical direction.

8. The stent graft dipping device according to claim 7, characterized in that: The upper surface of the supporting plate (28) is further provided with a cover plate (32). After the containing tube (29) is inserted into the clamping groove (31), the upper end opening is flush with or lower than the upper surface of the supporting plate (28). The cover plate (32) is driven by an electric mechanism to close or open the upper end opening of the containing tube (29).

9. The stent graft dipping device according to any one of claims 1 to 8, characterized in that: It also includes a third electric push rod (33) and a fourth electric push rod (34) fixedly connected to the bottom of the warehouse body (1), the telescopic end of the third electric push rod (33) is fixedly connected to the bottom of the upper partition one (5), and the telescopic end of the fourth electric push rod (34) is fixedly connected to the bottom of the upper partition two (6).

10. The stent graft dipping device according to claim 9, characterized in that: The warehouse body (1) comprises an upper warehouse body and a lower warehouse body, wherein the upper warehouse body is located at the upper part of the lower warehouse body and the four side walls and the top wall are made of transparent double-layer organic glass, and the lower warehouse body is made of hard plastic or metal, the third electric push rod (33) and the fourth electric push rod (34) are both located in the lower warehouse body, and the first translation mechanism and the second translation mechanism are both arranged in multiple intervals in the left and right directions.

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