A vascular stent polishing assembly and polishing device

Abstract

The application relates to a kind of blood vessel stent polishing assembly and polishing device, wherein the blood vessel stent polishing assembly includes the chassis installed in the bottom of polishing groove, and the friction member is arranged on the chassis, and the blood vessel stent can be reciprocated under the driving of anode hanger;The friction member at least includes a edge, the edge is in friction contact with the outer side wall of the blood vessel stent, and the edge is inclinedly arranged relative to the reciprocating direction of the blood vessel stent;The inclination angle of the friction member on the chassis is adjustable.The utility model can make the contact mode of blood vessel stent and polishing friction member be tangent point contact, and the contact point position is changed regularly, the current on the blood vessel stent can be evenly distributed, and the surface of the blood vessel stent is evenly polished.

Description

Technical Field

[0001] This application relates to the field of medical device processing and manufacturing technology, and more specifically, to a vascular stent polishing assembly and polishing device. Background Technology

[0002] In existing vascular stent polishing devices, a common approach is to use a force-applying device to apply force to the vascular stent so that the contact between the vascular stent and the polishing friction component is a line contact. The force-applying scheme involves placing a friction component horizontally at the bottom of the polishing liquid tank, with a rough surface on the friction component, allowing the vascular stent to roll dynamically on the rough surface.

[0003] Although the vascular stent is in motion, the current on the stent cannot be evenly distributed. The inner surface of the stent is still excessively corroded, the overall thickness is uneven, and there are protrusions and spikes on the outer wall. Utility Model Content

[0004] The purpose of this application is to provide a vascular stent polishing assembly and polishing device, which makes the contact between the vascular stent and the polishing friction element a tangential point contact, and continuously and regularly changes the position of the contact point, so as to evenly distribute the current on the vascular stent and ensure that the surface of the vascular stent is uniformly polished.

[0005] To achieve the above objectives, in a first aspect, the present invention provides a vascular stent polishing assembly, including a base frame installed at the bottom of a polishing tank and a friction element disposed on the base frame, wherein the vascular stent can reciprocate under the drive of an anode hanger; The friction element includes at least one edge, which is in frictional contact with the outer wall of the vascular stent, and the edge is inclined relative to the reciprocating movement direction of the vascular stent. The tilt angle of the friction element on the base frame is adjustable.

[0006] In an optional embodiment, the base frame includes a support frame and a mounting frame, the friction element is disposed on the mounting frame, the mounting frame is movably connected to the support frame, and the support frame is fixedly located at the bottom of the polishing tank.

[0007] In an optional embodiment, the support frame includes T-shaped supporting vertical rods and horizontal support base rods. The two ends of the horizontal support base rods are respectively connected to counterweights, and the counterweights and the horizontal support base rods form a U-shaped configuration base for the support frame.

[0008] In an optional embodiment, the mounting bracket has a semi-circular profile structure, including a mounting crossbar and a mounting arc-shaped bar; A connecting rod is provided at the center of the mounting crossbar. The connecting rod passes through the through hole provided on the supporting vertical bar and is locked and fixed by a screw sleeve.

[0009] In an optional embodiment, the middle part of the mounting arc-shaped rod is provided with an arc-shaped through groove, a locking screw is inserted through the arc-shaped through groove, the bottom cross brace is provided with a locking screw hole, and the locking screw passes through the arc-shaped through groove and is threaded into the locking screw hole.

[0010] In an optional embodiment, the friction element includes a friction strip with multiple edges, the friction strip being disposed along the entire length of the mounting crossbar; The edge that contacts the vascular stent extends parallel to the friction strip.

[0011] In an optional embodiment, the vascular stent is vertically inserted into the anode bracket, which includes an L-shaped bracket with a circular cross-section. The vascular stent is vertically sleeved onto the vertical part of the bracket, and at least a fitting gap is left between the bracket and the vascular stent.

[0012] In an optional embodiment, the base frame is made of PTFE, the mounting rod is made of pure titanium or titanium alloy, and the locking screw is made of pure titanium or titanium alloy.

[0013] In an optional embodiment, the friction element is made of a flexible material, or the friction element is made of a flexible conductive material.

[0014] Secondly, this utility model provides a vascular stent polishing device, including a polishing tank, a polishing machine, and a vascular stent polishing assembly as described in any of the foregoing embodiments. The polishing tank is filled with polishing liquid, the base frame is fixedly located at the bottom of the polishing tank, the top of the anode hanger is connected to the polishing machine and connected to the positive electrode of the polishing machine, and the polishing tank is connected to the negative electrode of the polishing machine.

[0015] By providing at least one edge on the friction component that makes frictional contact with the outer wall of the vascular stent, the original line contact between the vascular stent and the polishing friction component can be improved into a tangential point contact, thereby improving the current distribution on the vascular stent.

[0016] By combining the reciprocating motion of the vascular stent driven by the anode fixture, the position of the friction contact point can be changed continuously and regularly. During the dynamic process, the polishing current is evenly distributed on the vascular stent, ensuring that the surface of the vascular stent is uniformly polished.

[0017] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0018] 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.

[0019] Figure 1 This is a schematic diagram of the structure of the vascular stent polishing assembly in this application; Figure 2 This is a schematic diagram of the structure of the base and friction element in this application; Figure 3 This is a schematic diagram showing the fit between the vascular stent, anode mount, and friction element in this application.

[0020] icon: 1-Base frame; 11-Support frame; 111-Support vertical rod; 112-Horizontal brace bottom rod; 113-Counterweight block; 12-Mounting bracket; 121-Mounting crossbar; 122-Mounting curved bar; 123-Threaded sleeve; 124-Curved through groove; 2-Friction component; 21-Edge; 22-Friction strip; 3-Vascular stents; 4- Locking screws; 5-Hanging rod; 51-Vertical rod. Detailed Implementation

[0021] 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.

[0022] 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.

[0023] 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.

[0024] See Figure 1 and combined Figures 2-3 The vascular stent polishing assembly and polishing device in this application mainly improve the contact mode between the vascular stent 3 and the polishing friction element 2 by improving the structure of the friction element 2, thereby improving the distribution of polishing current on the vascular stent 3.

[0025] Refer to the stent suspension fixture and processing device disclosed in CN221967759U. Both the disclosed technical solution and the technical solution in this application are of the type of dynamic polishing of vascular stents. However, in the dynamic polishing process, the contact between the vascular stent and the friction sponge or frosted glass is in the form of line contact. That is to say, in the dynamic polishing process, the tangent line between the outer wall of the vascular stent and the friction element is the friction polishing part. Although a certain polishing effect can be formed, the uniform distribution of current on the vascular stent during the dynamic polishing process is not fully considered. There will still be excessive corrosion, uneven overall thickness, and protrusions and spikes on the outer wall.

[0026] In this application, by improving the contact method between the vascular stent 3 and the polishing friction element 2 from the existing tangential line contact to tangential point contact, and by continuously and regularly changing the position of the contact point, it is possible to achieve a uniform distribution of current on the vascular stent 3 during dynamic polishing, thereby improving the polishing effect.

[0027] The vascular stent polishing assembly of this utility model includes a base frame 1 installed at the bottom of the polishing tank and a friction element 2 set on the base frame 1. The vascular stent 3 can reciprocate under the drive of the anode hanger.

[0028] The polishing tank is generally made of corrosion-resistant materials, such as conductive graphite, and contains an electrolytic polishing solution suitable for vascular stents made of materials such as nickel-titanium alloy, cobalt-chromium alloy, and stainless steel. The polishing tank itself is electrically connected to the negative electrode of the polishing machine (neither the polishing tank nor the polishing machine is shown in the figure).

[0029] While the vascular stent 3 moves back and forth with the anode holder, a base frame 1 is placed in the polishing liquid, and a friction element 2 is set on the base frame 1. The friction element 2 provides friction to the vascular stent 3, which enables the vascular stent 3 to rotate dynamically in combination with the friction while moving back and forth with the anode holder, thereby polishing the vascular stent 3 in the dynamic back and forth movement of the polishing liquid.

[0030] By adjusting the distance between the base frame 1 and the vascular stent 3, the radial support force and friction force provided by the friction element 2 to the vascular stent 3 can be changed. The radial support force and friction force can make the vascular stent 3 and the anode hanger in close contact at the force application point of the friction support.

[0031] The friction element 2 includes at least one edge 21, which is in frictional contact with the outer wall of the vascular stent 3, and the edge 21 is inclined relative to the reciprocating movement direction of the vascular stent 3.

[0032] By setting the edge 21 on the friction element 2 and tilting it relative to the reciprocating movement direction of the vascular stent 3, the tilted edge 21 can form a point contact friction form that is tangential to the outer wall of the vascular stent 3. Furthermore, during the reciprocating movement of the vascular stent 3, the contact point position between the tilted edge 21 and the outer wall of the vascular stent 3 changes regularly, ensuring the uniform distribution of current on the vascular stent 3.

[0033] Furthermore, the tilt angle of the friction element 2 on the base frame 1 is adjustable. Specifically, the tilt angle of the edge 21 on the friction element 2 on the base frame 1 is adjustable, which can control and adjust the height range of the point contact on the outer wall of the vascular stent 3 when the vascular stent 3 is vertically hung, and thus is suitable for dynamic polishing of vascular stents 3 of different heights (lengths).

[0034] The vascular stent 3 generates rolling friction during reciprocating motion, which not only effectively removes burrs from the outer wall, but more importantly, changes the dynamic contact between the vascular stent 3 and the friction edge 21, promoting a uniform distribution of current across the entire surface of the vascular stent 3. This solves the problems of excessive corrosion on the inner surface and overall unevenness in texture. Simultaneously, the adjustable tilt angle allows for adaptation to vascular stents 3 of different specifications and polishing requirements, enhancing versatility and controllability of the polishing effect.

[0035] The point contact between the outer wall of the vascular stent 3 and the inclined edge 21, combined with reciprocating motion, can effectively smooth out the microscopic protrusions and spikes on the outer wall of the stent. Due to the continuous mechanical disturbance and the regular changes in the contact points, it promotes the uniform distribution of current on the stent surface, thereby avoiding the problem of uneven coarseness caused by excessive local corrosion, and especially improving the polishing effect of the inner surface of the stent.

[0036] The base frame 1 of the vascular stent polishing assembly specifically includes a support frame 11 and a mounting frame 12. The friction element 2 is disposed on the mounting frame 12. The mounting frame 12 is movably connected to the support frame 11. The support frame 11 is fixedly located at the bottom of the polishing tank to improve the overall stability.

[0037] The mounting bracket 12 can better fix the friction component 2, while the support bracket 11 serves to counterweight and distribute the load. At the same time, it can make the angle of the friction component 2 relative to the base frame 1 adjustable. The structure is simple and reliable, and easy to operate and maintain.

[0038] Furthermore, the support frame 11 includes T-shaped support vertical rods 111 and horizontal support bottom rods 112. The two ends of the horizontal support bottom rods 112 are respectively connected to counterweights 113. The counterweights 113 and the horizontal support bottom rods 112 constitute the configuration base of the support frame 11.

[0039] The combination of the T-shaped support structure and the U-shaped base configuration significantly improves the stability of the base frame 1 when placed at the bottom of the polishing tank. It can resist the impact of liquid flow and the disturbance caused by the movement of the support during the polishing process, ensuring the smooth progress of the polishing process.

[0040] The mounting bracket 12 has a semi-circular outline structure, including a mounting crossbar 121 and a mounting arc-shaped rod 122; a through rod is provided in the center of the mounting crossbar 121, and the through rod passes through the through hole provided on the supporting vertical rod 111 and is locked and fixed by the screw sleeve 123.

[0041] By detachably combining the horizontal mounting bar 121 with the vertical support bar 111, a stable support frame can be formed, which also facilitates the angle adjustment of the mounting bracket 12 around the support bar 111, and the locking method is simple and effective.

[0042] To achieve better stability, an arc-shaped through groove 124 is provided in the middle of the arc-shaped rod 122. A locking screw 4 passes through the arc-shaped through groove 124. A locking screw hole is provided on the cross brace base rod 112. The locking screw 4 passes through the arc-shaped through groove 124 and is threaded into the locking screw hole.

[0043] By cooperating with the arc-shaped through groove 124 and the locking screw 4, on the one hand, the arc-shaped rod 122 can be rotated around the through rod in the unlocked state, thereby adjusting the tilt angle of the friction edge 21. On the other hand, it can provide double locking after the angle is adjusted to prevent the angle from shifting under long-term working vibration and ensure the stability of polishing parameters.

[0044] The friction element 2 in this application includes a friction strip 22 with multiple edges 21. The friction strip 22 is arranged along the entire length of the mounting crossbar 121, and can synchronously adjust the tilt angle of the friction edge 21 that contacts the outer wall of the vascular stent 3 during the adjustment of the tilt angle of the mounting frame 12.

[0045] Furthermore, the edge 21 that contacts the vascular stent 3, namely the friction edge 21, extends parallel to the friction strip 22. On the one hand, it provides a stable friction contact line. On the other hand, multiple edges 21 can provide a backup after the single edge 21 wears out, or can be selected when different contact characteristics are required, thus extending the service life of the friction element 2 and increasing the flexibility of use.

[0046] The vascular stent 3 is vertically connected to the anode hanger, which includes an L-shaped hanger 5 with a circular cross-section. The vascular stent 3 is vertically sleeved on the vertical rod 51 of the hanger 5, and there is at least a fitting gap between the hanger 5 and the vascular stent 3.

[0047] This ensures that after assembly, each part of the vascular stent 3 is fully exposed to the polishing solution, avoiding polishing dead angles caused by assembly obstruction. At the same time, the round cross-section rod and gap help the current to flow more evenly around the stent, further improving the polishing uniformity of the inner surface.

[0048] Specifically, the inner wall of the vascular stent 3 must also be in effective contact with the polishing fluid. Preferably, the outer diameter D1 of the anode holder and the inner diameter D2 of the vascular stent 3 satisfy the following relationship: (D2-D1)≥0.5mm, which can effectively fill the inner side of the vascular stent 3 with polishing fluid and ensure the polishing effect on the inner wall.

[0049] During polishing, since the current is evenly distributed on the vascular stent 3, the polishing power is constant when using a polishing machine with a constant voltage DC power supply. The weight of the vascular stent 3 after polishing can be controlled by adjusting the polishing time. After the polishing machine reaches the set polishing time, the anode hanger can be easily removed from the device, greatly reducing the difficulty of operation and improving the polishing effect and work efficiency.

[0050] In terms of specific materials, the base frame 1 is made of corrosion-resistant and insulating materials such as PTFE, which avoids unnecessary current diversion and corrosion. The hanging rod 5 and the locking screw 4 are made of pure titanium or titanium alloy, which not only ensures excellent conductivity and compatibility with polishing fluid, but also has sufficient strength and high corrosion resistance, thus extending the life of the device.

[0051] In terms of specific materials, the friction element 2 is made of a flexible material, such as EVA foam or EPDM rubber, which can generate appropriate flexible contact friction force on the vascular stent 3 upon contact, avoiding scratches or deformation that may be caused by rigid contact. If a flexible conductive material, such as conductive EVA foam, is used, a stable polishing current can be provided at the contact point while mechanically rubbing. The friction element 2 can be directly connected to the positive electrode, allowing the polishing current to act more directly on the contact point.

[0052] The cross-sectional shape of the friction element 2 can be triangular, rectangular, or pentagonal. By setting the friction element 2 to a soft strip with edge 21, the edge 21 of the friction element 2 contacts the vascular stent 3. The tilt angle can be changed by adjusting the locking screw 4 on the base. This angle ensures that when the vascular stent 3 reciprocates to the inflection point, the edge 21 of the friction element 2 contacts the very end of one side of the vascular stent 3. The tilt angle setting makes the contact point between the vascular stent 3 and the anode hanger constantly change during the reciprocating motion, which can evenly distribute the current on the vascular stent 3 and ensure the uniformity of the polished surface of the vascular stent 3.

[0053] This utility model also provides a vascular stent polishing device, including a polishing tank, a polishing machine, and the aforementioned vascular stent polishing components. The polishing tank is filled with polishing liquid, the base frame 1 is fixedly located at the bottom of the polishing tank, the top of the anode hanger is connected to the polishing machine and connected to the positive electrode of the polishing machine, and the polishing tank is connected to the negative electrode of the polishing machine.

[0054] By integrating the above-mentioned polishing components into a vascular stent polishing device that includes a polishing tank and a polishing machine, a highly efficient and stable vascular stent electropolishing system can be formed.

[0055] It can systematically solve the uniformity problem in the electropolishing of vascular stents, and significantly improve the surface smoothness and consistency of the product.

[0056] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0057] 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 vascular stent polishing assembly, characterized in that, It includes a base frame installed at the bottom of the polishing tank, and a friction component set on the base frame. The vascular stent can reciprocate under the drive of the anode hanger. The friction element includes at least one edge, which is in frictional contact with the outer wall of the vascular stent, and the edge is inclined relative to the reciprocating movement direction of the vascular stent. The tilt angle of the friction element on the base frame is adjustable.

2. The vascular stent polishing assembly according to claim 1, characterized in that, The base frame includes a support frame and a mounting frame. The friction element is disposed on the mounting frame, and the mounting frame is movably connected to the support frame. The support frame is fixedly located at the bottom of the polishing tank.

3. The vascular stent polishing assembly according to claim 2, characterized in that, The support frame includes T-shaped vertical support rods and horizontal support base rods. The two ends of the horizontal support base rods are respectively connected to counterweights. The counterweights and the horizontal support base rods form a U-shaped base for the support frame.

4. The vascular stent polishing assembly according to claim 3, characterized in that, The mounting bracket has a semi-circular outline structure, including a mounting crossbar and a mounting arc-shaped bar; A connecting rod is provided at the center of the mounting crossbar. The connecting rod passes through the through hole provided on the supporting vertical bar and is locked and fixed by a screw sleeve.

5. The vascular stent polishing assembly according to claim 4, characterized in that, The middle part of the mounting arc rod is provided with an arc-shaped through groove, and a locking screw passes through the arc-shaped through groove. The bottom cross brace is provided with a locking screw hole, and the locking screw passes through the arc-shaped through groove and is threaded into the locking screw hole.

6. The vascular stent polishing assembly according to claim 4, characterized in that, The friction element includes a friction strip with multiple edges, which is arranged along the entire length of the mounting crossbar; The edge that contacts the vascular stent extends parallel to the friction strip.

7. The vascular stent polishing assembly according to claim 5, characterized in that, The vascular stent is vertically inserted into the anode bracket, which includes an L-shaped bracket with a circular cross-section. The vascular stent is vertically fitted onto the vertical part of the bracket, and there is at least a fitting gap between the bracket and the vascular stent.

8. The vascular stent polishing assembly according to claim 7, characterized in that, The base frame is made of PTFE, the mounting rod is made of pure titanium or titanium alloy, and the locking screw is made of pure titanium or titanium alloy.

9. The vascular stent polishing assembly according to claim 4, characterized in that, The friction element is made of a flexible material, or the friction element is made of a flexible conductive material.

10. A vascular stent polishing device, characterized in that, The invention includes a polishing tank, a polishing machine, and a vascular stent polishing assembly as described in any one of claims 1-9. The polishing tank contains polishing fluid, the base frame is fixedly located at the bottom of the polishing tank, the top of the anode hanger is connected to the polishing machine and connected to the positive electrode of the polishing machine, and the polishing tank is connected to the negative electrode of the polishing machine.

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