A heart stent polishing device and polishing method

Abstract

This application relates to a cardiac stent polishing apparatus and method. The cardiac stent polishing apparatus includes a polishing fixture and a polishing tank. A conductive wire is connected to the polishing fixture, and a metal tube is threaded through the conductive wire. The cardiac stent is fitted onto the metal tube. A metal plate is disposed in the polishing tank, and a glass plate is attached to the metal plate. The glass plate is a frosted glass plate with a flat structure. The cardiac stent is rolled and polished on the frosted surface of the frosted glass plate under the action of the polishing fixture. This invention can solve the problem of avoiding scratches on the inner surface of the stent during the polishing process, making the electric field distribution more uniform, and improving the stent polishing effect.

Description

Technical Field

[0001] This application relates to the field of stent polishing technology, and more specifically, to a cardiac stent polishing device and polishing method. Background Technology

[0002] A cardiac stent is a commonly used medical device whose primary function is to open blocked arteries. Currently, commonly used materials for cardiac stents include stainless steel, nickel-titanium alloys, and cobalt-chromium alloys. Among these, cobalt-chromium alloys possess excellent mechanical properties, corrosion resistance, and biocompatibility, making them an ideal material for cardiac stents.

[0003] To improve the surface quality of cardiac stents and reduce the risk of thrombosis, surface treatment is usually required. Currently, the most commonly used surface treatment method is electrochemical polishing. Electrochemical polishing utilizes electrolysis to produce processes such as dissolution, oxidation, and removal at the anode, thereby making the surface smooth, shiny, and stress-free.

[0004] However, during electrochemical polishing, defects such as localized over-dissolution or under-dissolution can easily occur on the surface due to the complex structure, large curvature variations, and uneven current density of the cardiac stent. To address this issue, existing technologies propose inserting a thin conductive wire through the cardiac stent and connecting it to the anode to create a uniformly distributed weak electric field in the electrolyte to assist polishing. This method can effectively improve surface roughness and uniformity.

[0005] However, the above method also has the following problems. First, poor contact between the conductive wire and the cardiac stent can cause excessive local contact pressure, resulting in scratches. Second, poor contact between the conductive wire and the stent can also generate local high temperatures or sparks, affecting the surface condition of the stent. Furthermore, due to the special structure of the stent, the electric field distribution changes with the rolling of the stent during polishing, resulting in an uneven electric field distribution that affects the polishing effect. Summary of the Invention

[0006] The purpose of this application is to provide a cardiac stent polishing device and polishing method, which can solve the problem of avoiding scratches on the inner surface of the stent during the polishing process, making the electric field distribution more uniform, and improving the stent polishing effect.

[0007] To achieve the above objectives, in a first aspect, the present invention provides a cardiac stent polishing device, including a polishing fixture and a polishing tank, wherein a conductive wire is connected to the polishing fixture, a metal tube is threaded through the conductive wire, and a cardiac stent is sleeved on the metal tube.

[0008] A metal plate is provided in the polishing tank, and a glass plate is attached to the metal plate. The glass plate includes a frosted glass plate with a flat structure.

[0009] The cardiac stent is rolled and polished on the frosted surface of the frosted glass plate under the action of the polishing fixture.

[0010] In an optional embodiment, the conductivity of the conductive wire is lower than that of the cardiac stent, the conductive wire comprising a tungsten wire, and the cardiac stent comprising a cobalt-chromium alloy stent.

[0011] In an optional embodiment, the metal plate is made of tantalum-plated alloy; the metal tube has a higher conductivity than the cardiac stent and is made of platinum alloy or stainless steel.

[0012] In an optional embodiment, the length of the metal tube is greater than the length of the cardiac stent, and the width of the metal plate is the same as the length of the metal tube.

[0013] In an optional embodiment, the metal plate and the frosted glass plate are arranged vertically parallel to each other, and the frosted glass plate is bonded to the metal plate.

[0014] In an optional embodiment, a groove is provided on the outer wall of the metal tube, and the cardiac stent is fitted onto the groove. The length of the groove is the same as the width of the frosted glass plate and not less than the length of the cardiac stent. The positions of the frosted glass plate and the groove correspond to each other.

[0015] In an optional embodiment, the inner diameter of the metal tube is 0.8-1 mm, the outer diameter is 1.2-1.4 mm, and the metal tube is 6-10 mm longer than the cardiac stent, with the groove located in the middle of the metal tube.

[0016] In an optional embodiment, the diameter of the conductive wire is 0.5-0.8 mm, and the polishing fixture includes two connecting branches arranged opposite to each other, with the conductive wire fixedly connected between the connecting branches.

[0017] In an optional embodiment, a lifting frame is also included, the connecting branch pipes are movably connected to the lifting frame, and the lifting frame drives the two connecting branch pipes to rise and fall vertically synchronously, with the vertically rising and falling positions maintaining at least a horizontal distance offset from the frosted glass plate.

[0018] Secondly, the present invention provides a polishing method using the cardiac stent polishing apparatus described in any of the foregoing embodiments, comprising the following steps:

[0019] A cardiac stent is fitted onto a metal tube, and a conductive wire is threaded through the metal tube.

[0020] The two ends of the conductive wire are fixedly connected to the polishing fixture;

[0021] The polishing fixture is used to immerse the cardiac stent into the polishing tank, and the cardiac stent is placed horizontally on the frosted glass plate.

[0022] The heart stent is moved up and down by a polishing fixture and rolled and polished on a frosted glass plate.

[0023] By placing a metal tube between the conductive wire and the cardiac stent, excessive local contact pressure of the conductive wire on the cardiac stent can be avoided, reducing scratches on the inner surface of the cardiac stent and improving product quality.

[0024] By attaching a frosted glass plate to a metal plate and rolling the cardiac stent along the frosted glass plate under the drive of a polishing fixture, the original sliding friction between the conductive wire and the cardiac stent is optimized to rolling friction. On the one hand, this allows the cardiac stent to avoid sliding friction dynamically during the rolling process. On the other hand, it also allows the outer surface of the cardiac stent to maintain a consistent dynamic distance from the metal plate. Even if the outer surface of the cardiac stent maintains a distance of the thickness of the frosted glass plate from the metal plate during dynamic rolling, the polishing will be more uniform.

[0025] In addition, the metal tube can make the electric field distribution more uniform, and combined with the dynamic rolling of the cardiac stent, it can achieve a better polishing effect.

[0026] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the cardiac stent polishing device in this application;

[0029] Figure 2 A diagram showing the structure and fit of a cardiac stent and a ground glass plate;

[0030] Figure 3 A top view of the cardiac stent on a ground glass plate;

[0031] Figure 4 This is a side view of the cardiac stent on a ground glass plate.

[0032] Figure 5 This is a diagram showing the connection between the branch pipe and the lifting frame.

[0033] icon:

[0034] 1-Polishing fixture; 11-Connecting branch pipe; 12-Lifting frame; 13-Hook; 14-Hanging rod;

[0035] 2-Polishing tank; 21-Metal plate; 22-Glass plate;

[0036] 3-Conductive wire;

[0037] 4-Metal tube; 41-Groove;

[0038] 5. Cardiac stent. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0041] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0042] See Figures 1-4 The cardiac stent polishing apparatus in this application is mainly used for the polishing process of cardiac stent 5. Specifically, it involves structural improvements to the polishing fixture 1 and the polishing tank 2, as well as improvements to the electric field distribution angle, in order to improve the structural performance of the cardiac stent 5 after polishing and the polishing effect during the polishing process.

[0043] The improvements in structural performance and polishing effect are triggered by the conversion of the original sliding friction into rolling friction through the setting of the metal tube 4 and the glass plate 22 for the rolling polishing of the heart stent 5.

[0044] The cardiac stent polishing device of the present invention includes a polishing fixture 1 and a polishing tank 2. During the polishing process, the cardiac stent 5 moves up and down in the polishing tank 2 under the drive of the polishing fixture 1. Electrochemical polishing is performed by the electric field formed between the cathode and the anode and the current in the electrolyte in the polishing tank 2.

[0045] A conductive wire 3 is connected to the polishing fixture 1, and a metal tube 4 is threaded through the conductive wire 3. The cardiac stent 5 is sleeved on the metal tube 4, and a metal plate 21 is placed in the polishing tank 2.

[0046] Compared with existing technologies, the metal tube 4 forms the transition structure of the cardiac stent 5 on the conductive wire 3, which reduces the stress concentration of the conductive wire 3 in local contact with the cardiac stent 5, and enables the metal tube 4 and the cardiac stent 5 to roll relative to each other on the conductive wire 3, thereby avoiding scratches on the cardiac stent 5.

[0047] During the polishing process, metal tube 4 serves as the anode metal tube 4, and metal plate 21 serves as the cathode metal plate 21. After applying DC voltage, current is generated between the anode and cathode in the electrolyte, which is an ethylene glycol solution containing sulfuric acid, phosphoric acid, citric acid, or boric acid.

[0048] Specifically, the conductive wire 3 mainly serves to conduct electricity, transferring the anode voltage on the polishing fixture 1 to the metal tube 4, and then through the metal tube 4 to the cardiac stent 5, so that the cardiac stent 5 acts as the anode and generates electrolysis under the action of the current in the electrolyte, thus polishing the surface of the cardiac stent 5.

[0049] A glass plate 22 is attached to a metal plate 21. The cardiac stent 5 is horizontally positioned and is rolled and polished along the surface of the glass plate 22 under the action of the polishing fixture 1. This arrangement optimizes the original sliding polishing method where the conductive wire 3 drives the stent on the cathode plate to rolling polishing of the cardiac stent 5 and the metal tube 4 on the glass plate 22. This reduces sliding friction damage to the stent structure and effectively ensures that all parts of the stent can make line contact with the glass plate 22 during the polishing process, thereby achieving uniform polishing through dynamic rolling.

[0050] The glass plate 22 in this invention includes a frosted glass plate 22 of the same thickness and a flat plate structure. The cardiac stent 5 is dynamically rolled and polished on the frosted surface of the frosted glass plate 22. Friction can be formed between the frosted surface of the frosted glass plate 22 and the cardiac stent 5, which helps to promote the cardiac stent 5 to roll under the action of friction and its line contact with the frosted surface.

[0051] Based on the line contact between the cardiac stent 5 and the frosted glass plate 22, during the rolling process, the cardiac stent 5, which serves as the anode, and the cathode metal plate 21 maintain a relatively consistent distance at all times. This relatively consistent distance is equal to the thickness of the flat frosted glass plate 22, which ensures that the electric field strength between the line contact area of ​​the cardiac stent 5 and the cathode metal plate 21 is relatively uniform. Combined with the dynamic rolling of the cardiac stent 5, the uniformity of the polishing process of the cardiac stent 5 can be effectively enhanced, thereby improving the polishing effect.

[0052] The cardiac stent 5 serves as the anode, and its polishing process is specifically carried out by the current generated in the electrolyte. The polishing effect is reflected in the strength of the current density. Based on the electrical conduction that the conductive wire 3 can achieve, and considering that the ultimate goal is to electrolytically polish the cardiac stent 5, which serves as the anode, it is necessary to consider that the current density between the cardiac stent 5 and the cathode metal plate 21 is greater than the current density between the conductive wire 3 and the cathode metal plate 21.

[0053] Preferably, the conductivity of the conductive wire 3 is lower than that of the cardiac stent 5. With this arrangement, under the premise of applying a fixed DC voltage between the anode and the cathode, that is, under the premise of electrical conduction of the conductive wire 3, the conductive wire 3, the metal tube 4 and the cardiac stent 5 maintain the same anode voltage, the current density between the cardiac stent 5 and the cathode metal plate 21 is greater than the current density between the conductive wire 3 and the cathode metal plate 21, thereby ensuring a good polishing effect between the cardiac stents.

[0054] Furthermore, the conductive wire 3 includes a tungsten wire, and the cardiac stent 5 includes a cobalt-chromium alloy stent. The conductivity of the cobalt-chromium alloy is higher than that of the tungsten wire. Conversely, the tungsten wire has a higher resistivity. Therefore, when a DC voltage is applied between the conductive wire 3, the metal tube 4, and the cardiac stent 5 (which serve as the anodes) and the cathode metal plate 21, the current transfer between the tungsten wire and the electrolyte will be more hindered, resulting in a lower current density.

[0055] The current density between the cardiac stent 5, which has lower resistivity, and the cathode metal plate 21 will be higher, thus allowing for more thorough electrolytic polishing of the cardiac stent 5.

[0056] The conductive wire 3 in the form of tungsten wire has better structural strength, can support the metal tube 4 and the cardiac stent 5, and is not easily deformed during the rolling of the cardiac stent 5, ensuring the reliability of the contact between the cardiac stent 5 and the frosted glass plate 22.

[0057] In this embodiment, the metal plate 21 serves as the cathode, specifically in the form of a tantalum alloy plate. The tungsten wire, the metal tube 4, and the cardiac stent 5, which are in line contact with each other, constitute the overall anode. The tungsten wire and the metal tube 4 are in line contact through the cooperation of the line and the arc surface, while the metal tube 4 and the cardiac stent 5 are in line contact through the tangential cooperation of two circles during dynamic rolling.

[0058] In order to take into account the current density between different anode components and cathode metal plate 21, and to take into account the polishing effect of cardiac stent 5, the conductivity of metal tube 4 is higher than that of conductive wire 3. Preferably, the conductivity of metal tube 4 is higher than that of cardiac stent 5. Specifically, the material of metal tube 4 includes platinum alloy or stainless steel.

[0059] The conductivity of the metal tube 4 is higher than that of the cardiac stent 5, which is considered from the perspective of the cardiac stent 5 being fitted into the metal tube 4. The current density between the metal tube 4 and the cathode electrode plate will be higher than that between the cardiac stent 5 and the cathode electrode plate, so that the charge between the metal tube 4 and the cathode electrode plate passes through the cardiac stent 5 and then to the cathode metal plate 21, thereby strengthening the electrolysis of the cardiac stent 5. Combined with the current density between the cardiac stent 5 itself and the cathode electrode plate, the polishing effect of the cardiac stent 5 can be enhanced in two ways.

[0060] The length of the metal tube 4 is greater than the length of the cardiac stent 5. Preferably, the width of the cathode metal plate 21 is the same as the length of the anode metal tube 4, which can form a relatively balanced electric field between the anode metal plate 21 and the cathode metal plate 21, further allowing the current between the two to pass completely through the cardiac stent 5, thus ensuring the polishing effect of the cardiac stent 5.

[0061] The cathode metal plate 21 and the glass plate 22 are arranged vertically and parallel to each other, and the glass plate 22 is bonded to the metal plate 21. Combined with the flat plate structure of the glass plate 22 with uniform thickness, the metal tube 4 and the cardiac stent 5 can maintain a relatively uniform distance from the cathode metal plate 21 during dynamic rolling, which further ensures the uniformity of the electric field formed between the two and the cathode metal plate 21, so that each part of the two can maintain a relatively stable current density with the cathode metal plate 21 during dynamic rolling.

[0062] Based on the corrosiveness of the electrolyte to metals, and considering both cost and performance, the metal tube 4 is preferably made of a platinum alloy. Although it is more expensive than stainless steel, it has higher corrosion resistance, longer service life, and can help improve the polishing effect of the cardiac stent 5.

[0063] To prevent the cardiac stent 5 from shifting on the metal tube 4, a groove 41 is provided on the outer wall of the metal tube 4. The cardiac stent 5 is fitted into the groove 41. Preferably, the length of the groove 41 is the same as the width of the frosted glass plate 22 and their positions correspond to each other. This allows the protrusions on both sides of the groove 41 to effectively limit the cardiac stent 5 while ensuring that the cardiac stent 5 can reliably roll on the frosted glass plate 22.

[0064] The length of the groove 41 should be no less than the length of the cardiac stent 5. At least, the length of the groove 41 should be the same as the length of the cardiac stent 5 to ensure that the outer surface of the cardiac stent 5 can roll along the frosted glass plate 22.

[0065] In this embodiment, the inner diameter of the metal tube 4 is 0.8-1mm and the outer diameter is 1.2-1.4mm, which allows the cardiac stent 5 to be reliably fitted onto the metal tube 4. In specific applications, a gap should be maintained between the cardiac stent 5 and the metal tube 4 so that the metal tube 4 and the cardiac stent 5 can dynamically roll on the frosted glass plate 22 with the tangent line as the baseline.

[0066] The metal tube 4 is 6-10 mm longer than the cardiac stent 5. The groove 41 is located in the middle of the metal tube 4, which can ensure that the cardiac stent 5 is reliably fitted into the groove 41 in the middle of the metal tube 4.

[0067] The diameter of the conductive wire 3 is 0.5-0.8mm. The polishing fixture 1 includes two connecting branches 11 arranged opposite to each other. The conductive wire 3 is fixedly connected between the connecting branches 11. By fixing the conductive wire 3 between the connecting branches 11 and combining the strength of the tungsten wire conductive wire 3 itself, it can effectively support the metal tube 4 and the cardiac stent 5 and drive the two to roll dynamically.

[0068] In this embodiment, the connecting branch pipe 11 is inclined relative to the frosted glass plate 22 and the metal plate 21, and the tungsten wire, the metal tube 4 sleeved on the tungsten wire and the cardiac stent 5 are able to maintain a state of self-weight overlap with the frosted glass plate 22 and the metal plate 21 under the gravity of the connecting branch pipe 11.

[0069] See Figure 5 The polishing fixture 1 also includes a lifting frame 12. The top of the connecting branch pipe 11 is connected to the lifting frame 12. When the conductive wire 3 is not connected, the connecting branch pipe 11 hangs down naturally. The lifting frame 12 is provided with a hook 13. A horizontal hanging rod 14 is connected between the tops of the two connecting branch pipes 11. By attaching the hanging rod 14 to the hook 13, the connecting branch pipe 11 and the lifting frame 12 can be movably connected, which facilitates disassembly and assembly as well as the replacement of different cardiac stents 5.

[0070] During the polishing process, the lifting frame 12 drives the two connecting branch pipes 11 to rise and fall vertically in sync, and the vertically rising and falling position maintains at least a horizontal distance misalignment with the frosted glass plate 22.

[0071] Simultaneously, the conductive wire 3, metal tube 4, and cardiac stent 5 are installed between the connecting branch tube 11, which prevents the connecting branch tube 11 from falling naturally. Correspondingly, the conductive wire 3, metal tube 4, and cardiac stent 5 are pressed onto the frosted glass plate 22 under the action of the horizontal decomposition force of the connecting branch tube 11 in the inclined state. This maintains the line contact relationship between the conductive wire 3, metal tube 4, and cardiac stent 5, and facilitates the formation of stress concentration points at the line contact positions, thereby enabling the metal tube 4 and cardiac stent 5 to reliably and stably roll dynamically.

[0072] Based on the above relationship and the vertical arrangement of the frosted glass plate 22, the outer surface of the cardiac stent 5 can be dynamically rolled vertically along the frosted surface of the frosted glass plate 22.

[0073] By setting a metal tube 4 between the conductive wire 3 and the cardiac stent 5, a transition structure can be formed. Combined with the frosted glass plate 22 attached to the cathode metal plate 21, the polishing effect of the cardiac stent 5 can be improved both structurally and functionally.

[0074] It is important to point out that this invention, based on the electric field angle and current density angle during the electrolysis process, and through the setting of a simple structure, fully improves the polishing effect of the cardiac stent 5 in terms of both structure and function. Combined with the mechanism of the electrolytic polishing process, it can maximize the surface of the cardiac stent 5 to be fully and effectively polished. It fully considers the coordination of the structure and function between different components, and is not just based on the setting, which will not be elaborated here.

[0075] The present invention also provides a method for polishing a cardiac stent, using the aforementioned cardiac stent polishing apparatus, specifically including the following steps:

[0076] A cardiac stent 5 is fitted onto the metal tube 4, so that the cardiac stent 5 is placed in the middle of the metal tube 4, and a conductive wire 3 is threaded through the metal tube 4.

[0077] The two ends of the conductive wire 3 are fixedly connected to the connecting branch pipe 11 of the polishing fixture 1;

[0078] Install the connecting branch pipe 11 on the lifting frame 12, immerse the conductive wire 3, metal tube 4 and cardiac stent 5 in the electrolyte of the polishing tank 2, and place the cardiac stent 5 horizontally on the frosted glass plate 22.

[0079] The heart stent 5 is moved up and down by the lifting frame 12 and the connecting branch tube 11, and is rolled and polished on the frosted glass plate 22.

[0080] The polishing method in this invention can ensure the polishing effect of the cardiac stent 5 and improve the quality of the product.

[0081] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0082] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A heart stent polishing apparatus, characterized by, The device includes a polishing fixture and a polishing tank. A conductive wire is connected to the polishing fixture, and a metal tube is threaded through the conductive wire. The metal tube forms a transfer structure for the cardiac stent on the conductive wire, and the cardiac stent is fitted onto the metal tube. The conductive wire is used to conduct the anodic voltage on the polishing fixture to the metal tube, and then conduct the anodic voltage to the cardiac stent through the metal tube; A metal plate is provided in the polishing tank, and a glass plate is attached to the metal plate. The glass plate includes a frosted glass plate of the same thickness and a flat structure. The cardiac stent is rolled and polished on the frosted surface of the frosted glass plate under the action of the polishing fixture. The conductivity of the conductive wire is lower than that of the cardiac stent, while the conductivity of the metal tube is greater than that of the cardiac stent. The length of the metal tube is greater than the length of the cardiac stent, and the width of the metal plate is the same as the length of the metal tube; The metal plate and the frosted glass plate are arranged vertically parallel to each other, and the frosted glass plate is bonded to the metal plate. A groove is provided on the outer wall of the metal tube, and the cardiac stent is fitted into the groove. The length of the groove is the same as the width of the frosted glass plate and not less than the length of the cardiac stent. The positions of the frosted glass plate and the groove correspond to each other.

2. The heart stent polishing apparatus of claim 1, wherein, The conductive wire includes a tungsten wire, and the cardiac stent includes a cobalt-chromium alloy stent.

3. The heart stent polishing apparatus of claim 2, wherein, The metal plate is made of tantalum-plated alloy; or platinum alloy or stainless steel.

4. The heart stent polishing apparatus of claim 1, wherein, The inner diameter of the metal tube is 0.8-1mm, the outer diameter is 1.2-1.4mm, and the metal tube is 6-10mm longer than the cardiac stent. The groove is located in the middle of the metal tube.

5. The cardiac stent polishing apparatus according to any one of claims 1-4, characterized in that, The diameter of the conductive wire is 0.5-0.8 mm, and the polishing fixture includes two connecting branches arranged opposite to each other, with the conductive wire fixedly connected between the connecting branches.

6. The heart stent polishing apparatus of claim 5, wherein, It also includes a lifting frame, and the connecting branch pipe is movably connected to the lifting frame. The lifting frame drives the two connecting branch pipes to rise and fall vertically in sync. The vertically rising and falling position is offset from the frosted glass plate by at least a horizontal distance.

7. A method of polishing a stent for a heart, using the polishing apparatus according to any one of claims 1 to 6, characterized by, Includes the following steps: A cardiac stent is fitted onto a metal tube, and a conductive wire is threaded through the metal tube. The two ends of the conductive wire are fixedly connected to the polishing fixture; The polishing fixture is used to immerse the cardiac stent into the polishing tank, and the cardiac stent is placed horizontally on the frosted glass plate. The heart stent is moved up and down by a polishing fixture and rolled and polished on a frosted glass plate.

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