Clamp for bearing intravascular stent for polishing and clamping mechanism of clamp

Abstract

The utility model discloses a clamp for bearing intravascular stent for polishing and a clamping mechanism thereof, the clamp comprises a bearing assembly and a blocking sleeve, the bearing assembly is used for bearing at least one intravascular stent, the bearing assembly comprises a plurality of clamping rods, the plurality of clamping rods are detachably assembled together, at least parts of the plurality of clamping rods are arranged in parallel, and the blocking sleeve is used for blocking the blocking sleeve. Any clamping rod can be arranged in the intravascular stent in a penetrating mode, and the adjacent clamping rods can clamp and fix the intravascular stent. The blocking sleeve is arranged on the bearing assembly in a sleeving mode, can gather the multiple clamping rods together and is located at the upper end and the lower end of the intravascular stent. By means of the clamp, the production process that multiple supports are polished in polishing liquid at the same time can be achieved, the ideal support product polishing effect is achieved, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrochemical polishing technical field, in particular to a kind of clamp and its clamping mechanism for bearing blood vessel stent to polish, especially to the polishing of cobalt-chromium alloy blood vessel stent. BACKGROUND

[0002] The existing blood vessel stent is formed after laser cutting, but oxide layer is generated on the surface of stent after laser cutting, there are a large number of burrs, residues and the like, and the surface of stent is dark, not bright and smooth enough, which is easy to scratch in use, so electrochemical polishing process is usually carried out after stent cutting to treat the surface of stent.

[0003] A kind of metal support electrochemical polishing clamp is disclosed in the conventional polishing device, for example, Chinese patent with the authorization announcement No.CN212426236U, metal support is placed in electrolytic cell by electrolyte immersion, and the stent oxidation polishing of anode is carried out by using electrochemical reaction when power is on, the clamp includes conductive bearing unit, the bearing unit has opposite two ends, respectively set stent entry end and stop end, stop structure is composed of a helical line member, the initial end is fixedly connected with the bearing section, and it spirally extends to the end along the length direction and diverges outward.The device can only hang one metal support for polishing by bearing section single time, and there is the problem of low production efficiency, and the current is large at the helical conductive member of lower part, and the problem of uneven polishing is easy to exist. UTILITY MODEL CONTENT

[0004] In view of the defects in the prior art, the utility model aims to provide a polishing clamp for blood vessel stent, so that multiple stents can be polished simultaneously in polishing liquid during electrochemical polishing process, thereby achieving ideal polishing effect of stent product and improving production efficiency.

[0005] The utility model provides a kind of clamp for bearing blood vessel stent to polish, comprising:

[0006] Bearing assembly is used to bear at least one blood vessel stent, and the bearing assembly includes a plurality of clamping rods, the plurality of clamping rods are detachably assembled together, the plurality of clamping rods are at least partially arranged in parallel, any one of the clamping rods can be arranged in the blood vessel stent, and adjacent clamping rods can clamp and fix the blood vessel stent.

[0007] Barrier sleeve is sleeved on the bearing assembly, and the plurality of clamping rods can be bundled together, and located at the upper and lower ends of the blood vessel stent.

[0008] Optionally, the clamping rod is a straight rod, and is made of stainless steel, nickel-titanium alloy or tantalum material.

[0009] Optionally, the blocking sleeve is a hollow tubular structure and is made of PTFE, PEEK, PPS, PE or phenolic resin material.

[0010] Optionally, the bearing assembly includes three clamping rods, the three clamping rods are arranged in a triangular layout, one of the three clamping rods is arranged in the vascular stent, and the other two clamping rods are arranged around the periphery of the vascular stent.

[0011] Optionally, the bearing assembly includes four clamping rods, the four clamping rods are arranged in a parallelogram layout, one of the four clamping rods is arranged in the vascular stent, and the other three clamping rods are arranged around the periphery of the vascular stent.

[0012] Optionally, the number of the vascular stents is multiple, and the multiple vascular stents are distributed along the length direction of the bearing assembly, and the upper and lower ends of each vascular stent are spaced apart from the blocking sleeve.

[0013] Optionally, the multiple vascular stents are arranged by different clamping rods, and the multiple vascular stents are arranged in different directions.

[0014] Optionally, the two ends of the multiple clamping rods are arranged flush with each other.

[0015] Optionally, the length of the clamping rod is greater than 8 cm, and the diameter is 0.5-1.5 mm.

[0016] The utility model also provides a kind of clamping mechanism for vascular stent polishing, including clamping piece and as described above the polishing clamp, the clamping piece one end is used to be connected with the positive pole of polisher, the clamping piece other end is equipped with two clamping jaws that can be opened and closed, and the polishing device is connected with the polisher by the clamping jaw.

[0017] The polishing clamp of the utility model, the bearing assembly includes multiple clamping rods, each clamping rod can bear the vascular stent, the adjacent multiple clamping rods can clamp the vascular stent, can realize the polishing of multiple vascular stents simultaneously, improve polishing efficiency, and the multiple clamping rods are equipped with blocking sleeve, which can prevent the vascular stent from falling off and fix the position between the multiple clamping rods, improve the stability of the whole structure, so that the polishing uniformity of the vascular stent is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the overall structure schematic diagram of electrochemical polishing clamp of one embodiment of the utility model;

[0019] Figure 2 It is the local structure schematic diagram of electrochemical polishing clamp of one embodiment of the utility model.

[0020] Figure 3 is the overall structure schematic diagram of the electrochemical polishing clamp of another embodiment of the utility model;

[0021] Figure 4 is the side view schematic diagram of the polishing clamp of the utility model clamping multiple blood vessel stents;

[0022] Figure 5 is the structure schematic diagram of the polishing mechanism of an embodiment of the utility model;

[0023] Figure 6 is the structure schematic diagram of the polishing mechanism of another embodiment of the utility model. DETAILED DESCRIPTION

[0024] The terms used in this application specification are merely for the purpose of describing specific embodiments and are not intended to limit the application. As used in the application specification and claims, the singular forms "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0025] The technical solutions in the embodiments of the application will be described below with reference to the drawings in the embodiments of the application, but the embodiments are not limiting of the utility model.

[0026] As Figures 1 to 6 shown, the utility model provides a kind of clamp 2000 for carrying blood vessel stent 3001 to carry out polishing, the clamp 2000 is used to clamp and carry blood vessel stent 3001, can be immersed into electrolytic cell with blood vessel stent 3001, and is realized to blood vessel stent 3001 by the power supply anode of connecting polishing machine (not shown in figure) polishing.

[0027] Clamp 2000 mainly includes two parts, is respectively carrying assembly and blocking sleeve 2011, carrying assembly is used to carry at least one blood vessel stent 3001, and carrying assembly includes multiple clamping rods 2001, multiple clamping rods 2001 are detachably assembled together, multiple clamping rods 2001 are at least partially parallel, any clamping rod 2001 can be arranged in blood vessel stent 3001, adjacent clamping rod 2001 can clamp and fix blood vessel stent 3001;Blocking sleeve 2011 is sleeved in carrying assembly, and multiple clamping rods 2001 can be bundled together, and located at the upper and lower ends of blood vessel stent 3001.

[0028] The clamping rod 2001 is a straight rod made of corrosion-resistant conductive material, such as 316L stainless steel, nickel-titanium alloy, or tantalum. The blocking sleeve 2011 is a hollow tubular structure made of corrosion-resistant and insulating material, such as PTFE (polytetrafluoroethylene), PEEK (polyether ether ketone), PPS (polyphenylene sulfide), PE (polyethylene), or phenolic resin. In this embodiment, the cylindrical blocking sleeve 2011 made of PTFE has excellent chemical stability and is resistant to corrosion, suitable for special environments with high temperature, corrosion, and high pressure.

[0029] Before clamping the vascular stent 3001, multiple clamping rods 2001 are brought together and assembled together by setting the blocking sleeve 2011; when preparing the polishing process, the vascular stent 3001 is sleeved on one clamping rod 2001, and the other clamping rods 2001 and the sleeved clamping rod 2001 together form a clamping on the vascular stent 3001, that is, one clamping rod 2001 is located on the inner wall of the vascular stent 3001, and the other clamping rods 2001 are clamped on the outer wall of the vascular stent 3001; during polishing, those skilled in the art can adjust the position of the blocking sleeve 2011 contacting the bearing assembly as needed, so that multiple straight clamping rods 2001 are in a relatively compact and rotating space of the vascular stent 3001. After the polishing of the vascular stent 3001 is completed, the blocking sleeve 2011 is removed to take out the required stent.

[0030] The length of the clamping rod 2001 is greater than 8 cm, for example, a 10 cm stainless steel rod or wire with a diameter of 0.5 mm to 1.5 mm can be used, which can be applied to most sizes of arterial and venous vascular stents 3001. For example, a vertebral artery stent with a diameter of 3 mm and a length of 20 mm can be sleeved on at least three vascular stents 3001 along the length direction of the bearing assembly. Other longer vascular stents 3001 can also use longer clamping rods 2001, such as 30 cm clamping rods 2001, to sleeve multiple long vascular stents 3001. The length of the blocking sleeve 2011 is greater than 3 mm, the inner diameter can be 0.8 mm to 1.2 mm, and the outer diameter can be 1.1 mm to 1.5 mm. The length of the clamping rod 2001 can be determined according to the length and number of the vascular stents 3001 to be polished in actual production, and the diameter of the blocking sleeve 2011 can be increased or decreased according to the number of clamping rods 2001 to achieve compact bundling of multiple clamping rods 2001.

[0031] Preferably, each clamping rod 2001 has the same specifications and dimensions, and when multiple clamping rods 2001 are assembled together, their ends are flush with each other. The fact that multiple clamping rods 2001 are arranged nearly parallel to each other and the ends of the clamps 2000 are flush can improve the phenomenon of tip discharge and avoid excessive tip current caused by multiple clamping rods 2001 of different lengths, staggered or uneven assembly, which would affect the polishing effect of the vascular stent 3001.

[0032] In one embodiment, such as Figure 1 and Figure 2 As shown, three clamping rods 2001 clamp two vascular stents 3001 to be polished. The three clamping rods 2001 are bound together by a blocking sleeve 2011, forming a triangular arrangement, similar to a pyramid structure. Each clamping rod 2001 can be close to and mutually restrained to ensure the stability of the stent. One of the three clamping rods 2001 passes through the vascular stent 3001, while the other two clamping rods 2001 are arranged around the periphery of the vascular stent 3001. Specifically, the two clamping rods 2001 on the outer wall of the vascular stent 3001 are arranged in an arc shape around the outer wall of the blood vessel. The two outer clamping rods 2001 form a surface contact with the vascular stent 3001, so that the vascular stent 3001 is in full axial contact with the clamping section, thereby making the clamping of the vascular stent 3001 more stable and the polishing current or voltage distribution more uniform, reducing the occurrence of ablation due to excessive local current; avoiding the following: The structural stability between the vascular stent 3001 and the clamping rod 2001 is poor. The vascular stent 3001 can move relative to the clamping rod 2001, or multiple clamping rods 2001 are prone to shaking, or the relative positions of multiple clamping rods 2001 are prone to shift, resulting in cross-dislocation between rods. This can easily lead to uneven distribution of current or voltage on the clamp 2000. Moreover, once cross-dislocation of rods occurs, tip discharge is likely to occur at the end of the rod, resulting in excessive current at that position and causing excessive polishing of the vascular stent 3001 near that position.

[0033] Wherein, two vascular stents 3001 are arranged on the bearing assembly, respectively arranged on different clamping rods 2001, which can realize polishing multiple stents at the same time, improve the polishing efficiency, and each vascular stent 3001 faces different directions, so that the polishing in different directions is dispersed, which further improves the uniformity of polishing, and the upper and lower ends of the vascular stent 3001 are respectively provided with a blocking sleeve 2011, that is, two vascular stents 3001 are provided with three blocking sleeves 2011, each blocking sleeve 2011 is also arranged at a distance from the vascular stent 3001, which does not affect the polishing effect of the vascular stent 3001, and the area of the clamping rod 2001 between each blocking sleeve 2011 is also reserved for the gap for the rotation of the vascular stent 3001, which facilitates the rotation of the vascular stent 3001 for polishing at various angles during multiple polishing, and the blocking sleeve 2011 can prevent the vascular stent 3001 from slipping off the clamping rod 2001 while collecting the bearing assembly.

[0034] In another embodiment, as shown in Figure 3 The difference between the above embodiment is that it shows three clamping rods 2001 clamping four vascular stents 3001 to be polished.

[0035] In another embodiment, as shown in Figure 4 The difference between the above embodiment is that it shows three clamping rods 2001 clamping 1-3 vascular stents 3001 to be polished, and the vascular stents 3001 face different directions when clamping multiple vascular stents 3001. It can be understood that the three stents to be polished are arranged at intervals along the length direction of the bearing assembly.

[0036] In other embodiments, four clamping rods 2001 can be arranged in a parallelogram layout, one of the four clamping rods 2001 is arranged in the vascular stent 3001, and the other three clamping rods 2001 are arranged around the periphery of the vascular stent 3001. It further realizes clamping more vascular stents 3001 for polishing, and has good structural stability.

[0037] In the actual polishing process, one clamping rod 2001 of the clamp 2000 passes through the vascular stent 3001 and is placed in the middle and lower part of the clamping rod 2001, so that the vascular stent 3001 can be completely immersed in the polishing liquid, the blocking sleeve 2011 is sleeved on the multiple clamping rods 2001, and two blocking sleeves 2011 are respectively located at the upper and lower ends of the vascular stent 3001, which is used to prevent the vascular stent 3001 from falling off during polishing, and the blocking sleeve 2011 can also collect the multiple clamping rods 2001 together to realize the stability and clamping of the vascular stent 3001.

[0038] In this embodiment, the voltage value is set to 6-10V and the current value is set to 0.7-1.5A. The polishing time for each cycle is adjusted according to the degree of polishing. After polishing for a certain period of time, the vascular stent 3001 can be rotated to polish all angles, thereby making the surface of the vascular stent 3001 more uniformly polished.

[0039] Based on its structural features, this utility model reduces the number of steps required for operators during the electrochemical polishing process of vascular stent 3001 production, further improving the smoothness of the treated surface. The product polishing speed is fast, and multiple vascular stents 3001 can be polished in one go, thereby achieving the goals of improving the reflectivity and smoothness of the vascular stent 3001 surface and increasing production efficiency.

[0040] Therefore, in order to maintain the smoothness of the inner and outer surfaces of the vascular stent 3001 and achieve a mirror-like effect while improving polishing efficiency and adapting to the development of large-scale production, this utility model will adopt electrochemical polishing with unique advantages. This method can continuously increase the number of vascular stents 3001 polished in a single operation by increasing the number of clamping units and expanding the diameter of the blocking components or increasing the number of blocking components. It has the advantages of improving production efficiency and enhancing the polishing effect of the vascular stent 3001 surface, thereby solving the problems of low polishing efficiency and poor polishing effect.

[0041] like Figure 5 As shown, this utility model also provides a clamping mechanism for polishing a vascular stent 3001, including a clamping member 1000 and the aforementioned polishing fixture 2000. One end of the clamping member 1000 is connected to the positive electrode of a polishing machine, and the other end of the clamping member 1000 is provided with two openable and closable jaws 1001. The polishing device is connected to the polishing machine by clamping the jaws 1001. The two jaws 1001 are provided with a serrated structure or a triangular notch adapted to the outer contour of the supporting component, so that the two jaws 1001 can clamp the supporting component when closed. A spring piece 1002 is also provided between the jaws 1001. The operator can open the two jaws 1001 by gripping and applying gripping force to the upper part of the two jaws 1001. After releasing the jaws 1001, the two jaws 1001 will close under the elastic restoring force of the spring piece 1002 to clamp the fixture 2000.

[0042] In other embodiments, such as Figure 6 As shown, the clamping device can be structured with pull rings 1003 on the outer wall of the jaws 1001, and the tops of the two jaws 1001 are hinged together. The operator can open the jaws 1001 by holding and passing through the two pull rings to apply tension to the jaws 1001. After releasing the pull rings 1003, the two jaws 1001 will meet under the elastic restoring force of the spring 1002 to clamp the clamp 2000.

[0043] In other embodiments, the clamping rod 2001 can also be fixedly connected to the clamping member 1000, for example by welding or integral molding, to fix the clamping rod 2001 to the clamping end of the clamping member 1000. That is, one or two clamping rods 2001 are installed at the clamping end of the clamping member 1000, and the clamping rods 2001 are assembled together by the opening and closing movement of the clamping ends. In this way, the blocking sleeve 2011 originally used to restrain the top of the clamping rod 2001 can be eliminated, and the clamping ends can limit the multiple clamping rods 2001.

[0044] While numerous embodiments of this application have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will arise for those skilled in the art without departing from the spirit and intent of this application. It should be understood that various alternatives to the embodiments of this application described herein may be employed in the practice of this application. The appended claims are intended to define the scope of protection of this application and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A clamp for polishing vascular stents, characterized in that, include: A support assembly for supporting at least one vascular stent, the support assembly including a plurality of clamping rods, the plurality of clamping rods being detachably assembled together, the plurality of clamping rods being arranged at least partially in parallel, any one of the clamping rods being able to pass through the vascular stent, and adjacent clamping rods being able to clamp and fix the vascular stent. A blocking sleeve, fitted onto the support assembly, is used to gather multiple clamping rods together and is located at the upper and lower ends of the vascular stent.

2. The polishing fixture according to claim 1, characterized in that, The clamping rod is a straight rod and is made of stainless steel, nickel-titanium alloy or tantalum.

3. The polishing fixture according to claim 1, characterized in that, The blocking sleeve is a hollow tubular structure and is made of PTFE, PEEK, PPS, PE or phenolic resin.

4. The polishing fixture according to claim 1, characterized in that, The support assembly includes three clamping rods arranged in a triangular layout. One of the clamping rods passes through the vascular stent, while the other two clamping rods are arranged around the periphery of the vascular stent.

5. The polishing fixture according to claim 1, characterized in that, The support assembly includes four clamping rods arranged in a parallelogram layout. One of the four clamping rods passes through the vascular stent, while the other three clamping rods are arranged around the periphery of the vascular stent.

6. The polishing fixture according to claim 4 or 5, characterized in that, The number of vascular stents is multiple, and the multiple vascular stents are spaced apart along the length direction of the bearing component. Each vascular stent is provided with a blocking sleeve at its upper and lower ends.

7. The polishing fixture according to claim 6, characterized in that, Multiple vascular stents are inserted by different clamping rods, and the multiple vascular stents are oriented in different directions.

8. The polishing fixture according to claim 1, characterized in that, The two ends of the multiple clamping rods are arranged flush with each other.

9. The polishing fixture according to claim 1, characterized in that, The clamping rod is longer than 8cm and has a diameter of 0.5mm to 1.5mm.

10. A clamping mechanism for polishing vascular stents, characterized in that, The device includes a clamping member and a polishing fixture as described in any one of claims 1 to 9, wherein one end of the clamping member is used to connect to the positive electrode of a polishing machine, and the other end of the clamping member is provided with two openable and closable jaws, and the polishing fixture is connected to the polishing machine by clamping the jaws.

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