Electrochemical polishing device for inner wall of vascular stent
By designing an electrochemical polishing device for vascular stents, and using a stirring device to make the electrolyte flow unidirectionally within the stent, the problem of poor inner wall polishing effect was solved, achieving efficient polishing and improved uniformity of the inner wall.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- PAISHENG TECH (CHANGZHOU) CO LTD
- Filing Date
- 2025-06-18
- Publication Date
- 2026-05-29
AI Technical Summary
In existing technologies, the inner wall polishing effect of vascular stents is poor, and the poor flow of electrolyte leads to low electrochemical reaction efficiency, making it impossible to effectively remove metal ions and bubbles from the inner wall.
An electrochemical polishing device for vascular stents is designed, comprising a cathode cylinder, an insulating disk, an anode pin, and a stirring device. The device stirs the electrolyte to create a unidirectional flow inside the stent, thereby increasing the flow rate and removing metal ions and bubbles from the inner wall.
It significantly improved the polishing effect of the inner wall of the vascular stent, enhanced the inner wall flow velocity, reduced concentration polarization, and improved the polishing efficiency and uniformity of the inner wall.
Smart Images
Figure CN224299441U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of medical stent technology, specifically relating to an electrochemical polishing device for the inner wall of a vascular stent. Background Technology
[0002] Medical metal stents are primarily used within tissue or blood vessel cavities to expand these cavities and treat conditions involving narrowing or blockage. After initial processing, medical metal stents typically have residual slag, burrs, and oxide film on their surface, requiring electrochemical polishing. Using an electrochemical polishing solution, the surface of the medical metal stent can be polished to a smooth, bright finish, achieving a mirror-like effect.
[0003] Patent publication number CN105386117A discloses an electrochemical polishing device and polishing method for a stent, which can achieve a good mirror effect on both the inner and outer surfaces of the stent, effectively improve the problem of large removal amount at the stent head, improve the uniformity of stent polishing, and give the stent a smooth and bright metal surface.
[0004] However, the tubular structure of vascular stents results in a relatively narrow inner wall space, hindering electrolyte flow within the stent. The flow rate through the inner wall is significantly lower than that through the outer wall. This insufficient flow rate prevents the timely removal of metal ions generated by the electrolytic reaction, causing them to accumulate on the inner wall surface. This hinders the continuous contact between the electrolyte and the substrate, thereby inhibiting the removal efficiency of the electrochemical reaction and the smoothing effect of the inner wall. Utility Model Content
[0005] The purpose of this invention is to provide an electrochemical polishing device for the inner wall of a vascular stent, so as to solve the technical problem of poor polishing effect on the inner wall of the stent in the prior art.
[0006] This application provides an electrochemical polishing device for vascular stents, comprising:
[0007] The cathode cylinder is connected to the negative terminal of the power supply and is used to place in the electrolytic cell containing electrolyte.
[0008] An insulating disk is disposed at the bottom of the cathode cylinder; the insulating disk is provided with a through hole for accommodating the support; the through hole penetrates the upper and lower surfaces of the insulating disk;
[0009] An anode pin, one end of which is used to firmly fix the bracket in the through hole and is electrically connected to the bracket; the other end is connected to the positive terminal of the power supply; and
[0010] The stirring device is used to stir the electrolyte in the cathode cylinder, so that the electrolyte flows through the inside of the support.
[0011] In one embodiment of this application, the lower end of the cathode cylinder is provided with several support legs for supporting the bottom surface of the insulating disk away from the bottom plate of the electrolytic cell.
[0012] In one embodiment of this application, a support ring is provided at the lower end of the cathode cylinder for placing an insulating disk.
[0013] In one embodiment of this application, the insulating disk is provided with a first channel connecting the sidewall of the through hole and the sidewall of the insulating disk for accommodating the anode pin;
[0014] The cathode cylinder has a second channel on its side wall for accommodating the anode pin.
[0015] In one embodiment of this application, an insulating sleeve is provided on the outer wall of the anode pin.
[0016] In one embodiment of this application, the agitating device includes:
[0017] The stirring paddle is located inside the cathode cylinder;
[0018] The connecting rod has a stirring paddle at one end and a rotary motor at the other end.
[0019] In one embodiment of this application, the electrolyte level in the electrolytic cell is higher than the upper end of the cathode cylinder.
[0020] In one embodiment of this application, the insulating disk is made of polytetrafluoroethylene.
[0021] The beneficial effects of this utility model are:
[0022] Unlike existing technologies, this application provides an electrochemical polishing device for vascular stents, comprising: a cathode cylinder, connected to the negative terminal of a power supply, for placement in an electrolytic cell containing electrolyte; an insulating disk, disposed at the bottom of the cathode cylinder; the insulating disk having a through hole for accommodating the stent; the through hole penetrating the upper and lower surfaces of the insulating disk; an anode pin, one end of which is used to firmly fix the stent within the through hole and is electrically connected to the stent; the other end of which is connected to the positive terminal of the power supply; and a stirring device for stirring the electrolyte within the cathode cylinder, causing the electrolyte to flow through the interior of the stent. In this invention, the stirring device of the electrochemical polishing device for vascular stents, after stirring the electrolyte, generates forced convection that directly acts on the inner wall region of the through hole. The cathode cylinder, insulating disk, and through hole constraint force the electrolyte to flow out only through the through hole, forming a unidirectional flow of "inlet → inner wall → outlet" inside the stent, significantly increasing the local flow velocity on the inner wall. The high-speed electrolyte continuously carries away metal ions and bubbles from the inner wall surface, reducing concentration polarization and improving the polishing effect of the stent's inner wall.
[0023] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.
[0024] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0026] Figure 1 This is a schematic diagram of a preferred embodiment of the electrochemical polishing device for vascular stents of the present invention;
[0027] Figure 2 This is a cross-sectional view of a preferred embodiment of the vascular stent electrochemical polishing device of this utility model;
[0028] Figure 3 This is a schematic diagram of a preferred embodiment of the cathode cylinder of this utility model;
[0029] Figure 4 This is a schematic diagram of an insulating disk according to a preferred embodiment of the present invention.
[0030] In the picture:
[0031] Support 100, cathode cylinder 1, support leg 11, support ring 12, second channel 13, electrolytic cell 2, insulating disc 3, through hole 31, first channel 32, anode pin 4, insulating sleeve 41, stirring device 5, stirring paddle 51, connecting rod 52, rotary motor 53. Detailed Implementation
[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0033] This application provides an electrochemical polishing device for vascular stents, which will be described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.
[0034] See Figures 1 to 4 In one embodiment, the vascular stent electrochemical polishing device includes: a cathode cylinder 1, connected to the negative terminal of a power supply, for placement in an electrolytic tank 2 containing electrolyte; an insulating disk 3, disposed at the bottom of the cathode cylinder 1; the insulating disk 3 having a through hole 31 for accommodating a stent 100; the through hole 31 penetrating the upper and lower surfaces of the insulating disk 3; an anode pin 4, one end of which is used to press and fix the stent 100 into the through hole 31 and is electrically connected to the stent 100; the other end of which is connected to the positive terminal of the power supply; and a stirring device 5, for stirring the electrolyte in the cathode cylinder 1, so that the electrolyte flows through the interior of the stent 100.
[0035] In this embodiment, the cathode cylinder 1 has openings at both the top and bottom. An insulating disk 3 is provided at the lower opening, and a through hole 31 is provided on the insulating disk 3. The anode pin 4 fixes the support 100 in the through hole 31. When the stirring device 5 stirs the electrolyte in the cathode cylinder 1, due to the constraints of the cathode cylinder 1, the insulating disk 3, and the through hole 31, the convection generated by the stirring device 5 can only flow out of the cathode cylinder 1 through the through hole 31. This allows the electrolyte to flow in the internal channels of the support 100, thereby removing metal ions and bubbles from the inner wall surface of the support and improving the polishing effect of the inner wall of the support. The outer wall of the support 100 is constrained by the through hole 31, which prevents over-polishing of the outer wall.
[0036] Optionally, the agitation device 5 includes: a stirring paddle 51 disposed inside the cathode cylinder 1; and a connecting rod 52, one end of which is connected to the stirring paddle 51 and the other end of which is connected to a rotary motor 53.
[0037] In this embodiment, when the rotary motor 53 rotates, it drives the stirring paddle 51 to rotate through the connecting rod 52, so that the electrolyte can flow downward to the inner wall of the support 100.
[0038] In this embodiment, the electrolyte level in the electrolytic cell 2 is higher than the upper end of the cathode cylinder 1. When the stirring paddle 51 rotates, the electrolyte can flow out of the cathode cylinder 1 through the through hole 31 and then enter the cathode cylinder 1 through the upper opening.
[0039] To ensure the normal flow of electrolyte, the lower end of the cathode cylinder 1 is provided with several support legs 11, which are used to prop the bottom surface of the insulating disk 3 away from the bottom surface of the electrolytic cell 2.
[0040] In this embodiment, by propping the bottom surface of the insulating disk 3 away from the bottom surface of the electrolytic cell 2, a flow space is formed below the bottom surface of the insulating disk 3 to facilitate electrolyte circulation.
[0041] Optionally, a support ring 12 is provided at the lower end of the cathode cylinder 1 for placing the insulating disk 3.
[0042] In this embodiment, the insulating disk 3 is provided with a first channel 32 connecting the side wall of the through hole 31 and the side wall of the insulating disk 3, for accommodating the anode pin 4; the side wall of the cathode cylinder 1 is provided with a second channel 13 for accommodating the anode pin 4.
[0043] Optionally, a first channel 32 and a second channel 13 can be respectively opened on the side walls of the insulating disk 3 and the cathode cylinder 1. Then, the pin end of the anode pin 4 is inserted into the second channel 13 and the first channel 32 in sequence until the end contacts the bracket 100, and the bracket 100 is pressed tightly into the through hole 31, thus completing the fixation of the bracket 100. Since both the anode pin 4 and the bracket 100 are made of metal, they can achieve electrical connection after contact.
[0044] To prevent a short circuit from occurring when the anode pin 4 comes into contact with the cathode cylinder 1, an insulating sleeve 41 is provided on the outer wall of the anode pin 4.
[0045] Optionally, the insulating disk 3 is made of polytetrafluoroethylene.
[0046] In summary, compared to traditional methods that struggle to achieve the desired polishing effect on the inner wall of stents, the electrochemical polishing device for vascular stents of this invention can achieve higher electrolyte flow rates and scouring forces on the stent inner wall, specifically addressing the problem of low inner wall removal efficiency. Simultaneously, the constraint of the through-holes on the outer wall of the stent reduces the risk of over-polishing. Within the same polishing time, the amount of material removed from the inner wall increases, and the surface roughness decreases more significantly, achieving a dual improvement in efficiency and leveling effect.
[0047] It should be noted that all the devices (parts whose specific structures are not specified) selected in this application are general standard parts or parts known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.
[0048] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 mechanical connection or an electrical 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 utility model based on the specific circumstances.
[0049] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0050] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification.
Claims
1. An electrochemical polishing device for the inner wall of a vascular stent, characterized in that, include: The cathode tube (1) is connected to the negative terminal of the power supply and is used to be placed in the electrolytic cell (2) containing electrolyte. An insulating disk (3) is disposed at the bottom of the cathode cylinder (1); the insulating disk (3) is provided with a through hole (31) for accommodating the support (100); the through hole (31) penetrates the upper and lower surfaces of the insulating disk (3); Anode pin (4), one end of which is used to press and fix the bracket (100) into the through hole (31) and is electrically connected to the bracket (100); the other end is connected to the positive terminal of the power supply; and The stirring device (5) is used to stir the electrolyte in the cathode cylinder (1) so that the electrolyte flows through the interior of the support (100).
2. The electrochemical polishing device for the inner wall of a vascular stent according to claim 1, characterized in that, The lower end of the cathode cylinder (1) is provided with several support legs (11) for supporting the bottom surface of the insulating disk (3) away from the bottom surface of the electrolytic cell (2).
3. The electrochemical polishing device for the inner wall of a vascular stent according to claim 2, characterized in that, The lower end of the cathode cylinder (1) is provided with a support ring (12) for placing the insulating disk (3).
4. The electrochemical polishing apparatus for the inner wall of a vascular stent according to claim 1, characterized in that, The insulating disk (3) is provided with a first channel (32) connecting the side wall of the through hole (31) and the side wall of the insulating disk (3) for accommodating the anode pin (4). The cathode cylinder (1) has a second channel (13) on its side wall for accommodating the anode pin (4).
5. The electrochemical polishing apparatus for the inner wall of a vascular stent according to claim 1, characterized in that, An insulating sleeve (41) is provided on the outer wall of the anode pin (4).
6. The electrochemical polishing apparatus for the inner wall of a vascular stent according to claim 1, characterized in that, The stirring device (5) includes: A stirring paddle (51) is installed inside the cathode cylinder (1); The connecting rod (52) is connected to the stirring paddle (51) at one end and to the rotary motor (53) at the other end.
7. The electrochemical polishing apparatus for the inner wall of a vascular stent according to claim 1, characterized in that, The electrolyte level in the electrolytic cell (2) is higher than the upper end of the cathode cylinder (1).
8. The electrochemical polishing apparatus for the inner wall of a vascular stent according to claim 1, characterized in that, The insulating disk (3) is made of polytetrafluoroethylene.