CN114985907A - Blood vessel stent and manufacturing method thereof - Google Patents

Abstract

The application discloses a vascular stent and a manufacturing method thereof, wherein the manufacturing method of the vascular stent comprises the following steps: preparing a stainless steel bracket and a tantalum workpiece, wherein a hollow-out area matched with the tantalum workpiece is arranged on the stainless steel bracket; splicing the tantalum workpiece in the hollow area of the stainless steel bracket to obtain a workpiece to be welded; and (3) welding the spliced part of the tantalum workpiece and the stainless steel bracket on the workpiece to be welded through a nanosecond laser to obtain the blood vessel bracket with the tantalum mark. The technical problem that the intravascular stent manufactured by the prior art is low in-vivo positioning accuracy is solved.

Description

A kind of vascular stent and its production method

technical field

The present application relates to the technical field of laser welding, and in particular, to a blood vessel stent and a manufacturing method thereof.

Background technique

Cerebrovascular disease has high morbidity, high recurrence rate, high disability rate and high fatality rate. With the progress of the times, vascular stent implantation is an effective minimally invasive interventional treatment method. The characteristics of small size, high safety and high effectiveness have been affirmed by doctors and patients, and have become an important treatment method for peripheral vascular diseases. After clinical treatment, metal stents have achieved remarkable results. However, in the prior art, due to the low density of the metal substrate for making the vascular stent, the image displayed by the vascular stent under medical imaging equipment is not clear enough, and it is difficult to identify the position and shape of the stent with the naked eye. , it is difficult for doctors to accurately position the stent.

SUMMARY OF THE INVENTION

The main purpose of the present application is to provide a vascular stent and a manufacturing method thereof, aiming at solving the technical problem that the vascular stent manufactured in the prior art has low positioning accuracy in the body.

In order to achieve the above purpose, the present application provides a method for manufacturing a vascular stent, the method for manufacturing a vascular stent includes the following steps:

preparing a stainless steel bracket and a tantalum workpiece, wherein the stainless steel bracket is provided with a hollow area matching the tantalum workpiece;

splicing the tantalum workpiece in the hollow area of the stainless steel bracket to obtain the workpiece to be welded;

By using a nanosecond laser, tailor welding is performed on the spliced part of the tantalum workpiece and the stainless steel stent on the workpiece to be welded, so as to obtain a vascular stent marked with tantalum.

Optionally, the step of tailor welding the splicing of the tantalum workpiece and the stainless steel stent on the workpiece to be welded by a nanosecond laser to obtain a vascular stent with a tantalum mark includes:

Positioning the splicing point of the tantalum workpiece and the stainless steel bracket on the workpiece to be welded by using a machine vision system;

Determine the welding pattern and the position of the welding pattern according to the shape, specification and position of the joint;

By using a nanosecond laser and based on the welding track corresponding to the welding pattern, tailor welding is performed on the spliced part to obtain a blood vessel stent with a tantalum mark.

Optionally, the welding pattern is a circle with a diameter of 0.3-0.5 mm.

Optionally, the power of the nanosecond laser is 30-50W.

Optionally, the waveform pulse width of the nanosecond laser is 60-500 ns.

Optionally, the welding speed of the nanosecond laser is 60-150 mm/s.

Optionally, the frequency of the nanosecond laser is 600-1000 kHz.

Optionally, the width of the welding seam of the blood vessel stent is 80-150 μm.

Optionally, the field lens model corresponding to the nanosecond laser is SL-1064-112-163G.

The present application also provides a blood vessel stent, which is manufactured by the above-mentioned method for manufacturing a blood vessel stent.

The present application provides a vascular stent and a method for making the same. By preparing a stainless steel stent and a tantalum workpiece, the stainless steel stent is provided with a hollow area matching the tantalum workpiece, so that the hollow area on the stainless steel stent can be The matching of the tantalum workpiece to be welded on the stainless steel bracket, and then the workpiece to be welded is obtained by splicing the tantalum workpiece in the hollow area of the stainless steel bracket, and the assembly of the stainless steel bracket and the tantalum workpiece is realized, and then the nanosecond laser , tailor welding the splicing part of the tantalum workpiece and the stainless steel stent on the workpiece to be welded to obtain a vascular stent with a tantalum mark, which realizes the fixation of the tantalum workpiece on the stainless steel stent, and the developing image of the tantalum metal is clear. The vascular stent prepared by welding tantalum metal to a stainless steel stent, after entering the human body, the vascular stent can be positioned by the position of the tantalum metal, which can effectively improve the positioning accuracy of the vascular stent in the body and overcome the vascular stent produced by the prior art. The technical problem of low positioning accuracy of stents in vivo.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description serve to explain the principles of the application.

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. In other words, on the premise of no creative labor, other drawings can also be obtained from these drawings.

FIG. 1 is a schematic flowchart of an embodiment of a method for manufacturing a vascular stent of the present application;

2 is a schematic structural diagram of the vascular stent of the application;

FIG. 3 is a schematic structural diagram of the welding seam on the vascular stent of the present application.

The realization, functional features and advantages of the present application will be further described with reference to the accompanying drawings in conjunction with the embodiments.

Detailed ways

In order to make the above objects, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

An embodiment of the present application provides a method for manufacturing a vascular stent. In an embodiment of the method for manufacturing a vascular stent of the present application, referring to FIG. 1 , the method for manufacturing a vascular stent includes:

Step S10, preparing a stainless steel bracket and a tantalum workpiece, wherein the stainless steel bracket is provided with a hollow area matching the tantalum workpiece;

In this embodiment, specifically, stainless steel is used as a raw material to make a rough stainless steel bracket, and in the area to be cut determined on the rough stainless steel bracket, the rough stainless steel bracket is cut according to the region to be cut, and the rough stainless steel bracket is removed. After cutting the corresponding part of the area, a hollow area is formed on the stainless steel stent to obtain a stainless steel stent, wherein the stainless steel stent is a vascular stent made of stainless steel as the main material, the stainless steel is 316 stainless steel, and the tantalum workpiece is A workpiece made of tantalum metal through cutting, shaping and other processes, the to-be-cut area can be determined according to the shape and specifications of the tantalum workpiece, that is, on the preset development position of the stainless steel bracket, the tantalum workpiece and The area to be cut that matches the shape and specification, for example, if the tantalum workpiece is a circular workpiece with a diameter of a mm, then a circular area to be cut with a diameter of a mm is determined at the preset developing position of the stainless steel bracket, and the The area to be cut can be designed and reserved on the stainless steel bracket according to the actual specification and shape of the stainless steel bracket, and then the tantalum workpiece is cut and shaped according to the size of the to-be-cut area to obtain a Tantalum workpieces of matching shape and size.

It is easy to understand that, in order to facilitate the assembly of the tantalum workpiece and the stainless steel bracket, the tantalum workpiece is matched with the hollow area, and the shape and specification of the hollow area may be the same as the shape and specification of the tantalum workpiece, or A certain matching error range is reserved so that the actual specification of the hollow area is larger than the actual specification of the tantalum workpiece, so that the tantalum workpiece can be smoothly assembled on the stainless steel bracket.

In an implementation manner, referring to FIG. 2 , the hollow area of the stainless steel bracket is a circle with a diameter of 0.3-0.5mm, the tantalum workpiece is a circle with a diameter of 0.3-0.5mm, and the tantalum workpiece is a circle with a diameter of 0.3-0.5mm. The round tantalum metal can be clearly imaged during the development process, and will not increase the space of the blood vessel stent too much, and the round shape makes the part in contact with the blood vessel arc-shaped, which can reduce the damage to the blood vessel.

Step S20, splicing the tantalum workpiece in the hollow area of the stainless steel bracket to obtain the workpiece to be welded;

In this embodiment, specifically, the tantalum workpiece is spliced into the hollow area of the stainless steel bracket to obtain a workpiece to be spliced composed of the tantalum workpiece and the stainless steel bracket. It is easy to understand that the tantalum workpiece and the stainless steel bracket are combined. The splicing of the stainless steel bracket refers to the combination of physical positions. For example, the tantalum workpiece can be fixed in the hollow area of the stainless steel bracket through the frictional force at the splicing point, and the tantalum workpiece can also be fixed by tools such as clips. It is fixed in the hollow area of the stainless steel bracket.

In step S30, a nanosecond laser is used to tailor-weld the splicing portion of the tantalum workpiece and the stainless steel stent on the workpiece to be welded, to obtain a vascular stent marked with tantalum.

In this embodiment, specifically, an infrared laser beam is emitted to the joint of the tantalum workpiece and the stainless steel bracket on the workpiece to be welded by a nanosecond laser, so that the tantalum workpiece and the stainless steel bracket are close to the joint. The parts are assembled and welded together to obtain a vascular stent marked with tantalum, wherein the nanosecond laser is a laser that can generate nanosecond pulsed light. Tailor welding of the workpiece and the stainless steel stent can effectively control the width of the weld formed on the vascular stent after welding. The welding method of tailor welding can effectively reduce the influence of welding on the surface roughness of the vascular stent. Referring to Figure 3, it is easy to find The welded seam on the vascular stent is concave inward relative to the surface of the vascular stent, which can effectively reduce the contact between the welding seam surface and the inner wall of the blood vessel, so as to effectively avoid the rough surface of the vascular stent from being inserted into the blood vessel. Damage to the blood vessel, Optionally, the width of the welding seam of the vascular stent is 80-150 μm, and the narrower welding seam width is more suitable for the vascular stent with smaller size, and has less influence on the surface smoothness of the vascular stent, which can effectively reduce the thickness of the vascular stent. Damage to blood vessels from small rough surfaces.

Optionally, the step of tailor welding the splicing of the tantalum workpiece and the stainless steel stent on the workpiece to be welded by a nanosecond laser to obtain a vascular stent with a tantalum mark includes:

Step S31, positioning the splicing point of the tantalum workpiece and the stainless steel bracket on the workpiece to be welded by a machine vision system;

In this embodiment, specifically, a CCD (Charge Coupled Device, charge coupled device) machine vision system is used to locate the workpiece to be welded and the splicing point of the tantalum workpiece and the stainless steel bracket on the workpiece to be welded , wherein, the machine vision system is a system that uses machines instead of human eyes to make various measurements and judgments. Because the size of the blood vessel stent is small, it is difficult to locate by the naked eye, and the machine vision system is beneficial to improve the accuracy of positioning.

Step S32, determining the welding pattern and the position of the welding pattern according to the shape, specification and position of the splicing part;

In this embodiment, specifically, the shape and specification of the spliced part of the tantalum workpiece and the stainless steel bracket are measured and determined, and the shape and specification of the welding pattern of nanosecond laser welding are determined according to the shape and specification of the spliced part, The position of the welding pattern is determined according to the location of the splicing position, wherein the welding pattern is used to determine the movement track and welding range of the laser beam during the nanosecond laser welding process.

Optionally, the welding pattern is a circle with a diameter of 0.3-0.5mm, and the circular tantalum metal with a diameter of 0.3-0.5mm can be clearly imaged during the development process, and does not increase the space of the blood vessel stent too much, and the circle is round. The shape of the shape makes the part in contact with the blood vessel arc-shaped, which can reduce the damage to the blood vessel.

Step S33 , by using a nanosecond laser and based on the welding track corresponding to the welding pattern, tailor welding the splicing part to obtain a blood vessel stent marked with tantalum.

In this embodiment, specifically, according to the shape, specification and position of the welding pattern, determine the welding trajectory of emitting nanosecond laser for welding, turn on the nanosecond laser to emit nanosecond laser beam, and control the laser through a high-speed scanning galvanometer The beam moves along the welding track, and tailor welding is performed on the spliced part to obtain a blood vessel stent with a tantalum mark.

Optionally, the power of the nanosecond laser is 30-50W, so that the tantalum and the stainless steel can be closely welded together to prevent the tantalum workpiece from falling off the blood vessel stent.

Optionally, the waveform pulse width of the nanosecond laser is 60-500 ns, so that the tantalum and the stainless steel can be closely welded together, so as to prevent the tantalum workpiece from falling off the blood vessel stent.

Optionally, the welding speed of the nanosecond laser is 60-150 mm/s, so that the tantalum and the stainless steel can be closely welded together, so as to prevent the tantalum workpiece from falling off the blood vessel stent.

Optionally, the frequency of the nanosecond laser is 600-1000 kHz, so that the tantalum and the stainless steel can be closely welded together to prevent the tantalum workpiece from falling off the blood vessel stent.

Optionally, the field lens model corresponding to the nanosecond laser is SL-1064-112-163G, wherein the field lens is a lens that can effectively reduce the size of the detector when working near the focal plane of the objective lens. Used to focus the laser beam emitted by the nanosecond laser to the splicing point of the stainless steel bracket and the tantalum workpiece, wherein 1064 indicates that the laser wavelength is 1064nm, 112 indicates that the field lens scanning width is 112mm×112mm; 163 indicates that The focal length of the field lens, the use of the field lens model SL-1064-112-163G can effectively reduce the size of the spot and reduce the width of the welding seam, thereby reducing the influence of welding on the surface roughness of the vascular stent, and effectively avoiding the roughness of the vascular stent after entering the body. damage of the stent surface to the inner wall of the blood vessel.

In this embodiment, by preparing a stainless steel bracket and a tantalum workpiece, wherein the stainless steel bracket is provided with a hollow area matching the tantalum workpiece, so that the hollow area on the stainless steel bracket and the workpiece to be welded to the stainless steel bracket are realized. The matching of the tantalum workpiece, and then by splicing the tantalum workpiece in the hollow area of the stainless steel bracket, the workpiece to be welded is obtained, and the assembly of the stainless steel bracket and the tantalum workpiece is realized, and then the workpiece to be welded is processed by a nanosecond laser. The splicing part of the tantalum workpiece and the stainless steel stent is tailor-welded to obtain a vascular stent with a tantalum mark, which realizes the fixation of the tantalum workpiece on the stainless steel stent, and the developing image of the tantalum metal is clear, and the tantalum metal is welded to the stainless steel stent. After entering the human body, the vascular stent prepared above can position the vascular stent through the position of the tantalum metal, which can effectively improve the positioning accuracy of the vascular stent in the body, and overcome the relatively high in vivo positioning accuracy of the vascular stent made by the prior art. Low technical issues.

Further, the present invention also provides a vascular stent, which is manufactured by the above-mentioned vascular stent manufacturing method, which solves the technical problem that the vascular stent manufactured in the prior art has low positioning accuracy in the body. Compared with the prior art, the beneficial effects of the vascular stent provided by the embodiment of the present invention are the same as those of the method for manufacturing a vascular stent in the above-mentioned embodiment, and details are not described herein.

The above are only the preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present application, or directly or indirectly applied in other related technical fields , are similarly included within the scope of patent processing of this application.

Claims (10)

1. a vascular stent manufacturing method, is characterized in that, described vascular stent manufacturing method comprises the following steps: preparing a stainless steel bracket and a tantalum workpiece, wherein the stainless steel bracket is provided with a hollow area matching the tantalum workpiece; splicing the tantalum workpiece in the hollow area of the stainless steel bracket to obtain the workpiece to be welded; By using a nanosecond laser, tailor welding is performed on the spliced part of the tantalum workpiece and the stainless steel stent on the workpiece to be welded, so as to obtain a vascular stent marked with tantalum. 2. The method for making a vascular stent according to claim 1, wherein the splicing of the tantalum workpiece and the stainless steel stent on the workpiece to be welded is tailor-welded by a nanosecond laser to obtain a tantalum The steps of labeling the vascular stent include: Positioning the splicing point of the tantalum workpiece and the stainless steel bracket on the workpiece to be welded by using a machine vision system; Determine the welding pattern and the position of the welding pattern according to the shape, specification and position of the joint; By using a nanosecond laser and based on the welding track corresponding to the welding pattern, tailor welding is performed on the spliced part to obtain a blood vessel stent with a tantalum mark. 3 . The method for manufacturing a vascular stent according to claim 2 , wherein the welding pattern is a circle with a diameter of 0.3-0.5 mm. 4 . 4 . The method for manufacturing a vascular stent according to claim 1 , wherein the power of the nanosecond laser is 30-50W. 5 . 5 . The method for manufacturing a blood vessel stent according to claim 1 , wherein the waveform pulse width of the nanosecond laser is 60-500 ns. 6 . 6 . The method for manufacturing a blood vessel stent according to claim 5 , wherein the welding speed of the nanosecond laser is 60-150 mm/s. 7 . 7 . The method for manufacturing a blood vessel stent according to claim 1 , wherein the frequency of the nanosecond laser is 600-1000 kHz. 8 . 8 . The method for manufacturing a vascular stent according to claim 1 , wherein the width of the welding seam of the vascular stent is 80-150 μm. 9 . 9 . The method for manufacturing a vascular stent according to claim 1 , wherein the field lens model corresponding to the nanosecond laser is SL-1064-112-163G. 10 . 10 . A vascular stent, characterized in that, the vascular stent is manufactured by the method for manufacturing a vascular stent according to any one of claims 1 to 9 .

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