CN111759554B - W-shaped ring and method for passivating and fixing end part of braided metal bracket by using same - Google Patents
W-shaped ring and method for passivating and fixing end part of braided metal bracket by using same Download PDFInfo
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- CN111759554B CN111759554B CN202010650625.8A CN202010650625A CN111759554B CN 111759554 B CN111759554 B CN 111759554B CN 202010650625 A CN202010650625 A CN 202010650625A CN 111759554 B CN111759554 B CN 111759554B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
- A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
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- Oral & Maxillofacial Surgery (AREA)
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- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention relates to a W-shaped ring and a method for passivating and fixing the end part of a braided metal bracket by using the W-shaped ring, belonging to the technical field of medical instruments. The tail end of the end part of the metal support is provided with a passivated W-shaped ring surrounding the end head, the W-shaped ring is connected with the metal support body, and one end, far away from the metal support body, of the W-shaped ring is provided with a passivated sharp corner. The invention provides a method for passivating and fixing the end part of a braided metal stent by using a W-shaped ring, which is suitable for a metal stent obtained by mechanical braiding and an integrated braided covered stent. The sharp end can be passivated to prevent the tissue of the cavity surface of the organ from being damaged by processing the metal head at the end part of the metal stent obtained by mechanical weaving or the integrated woven covered stent; the edges can be fixed, and the woven structure is prevented from loosening and scattering; can ensure the compressibility, the self-expansibility and the structural stability of the stent or the covered stent in the process of conveying by a minimally invasive means.
Description
Technical Field
The invention relates to a W-shaped ring and a method for passivating and fixing the end part of a braided metal bracket by using the W-shaped ring, belonging to the technical field of medical instruments.
Background
The woven self-expandable metal stent comprises a bare stent and a covered stent, and plays an important role in clinically treating the stenosis of the pipeline organoid at present. Common stent products include esophageal stents, biliary stents, vascular stents, intestinal stents, fallopian tube stents, ureteral stents, urethral stents, and the like. However, most of the current scaffolds are formed mainly by hand knitting, and the production efficiency is extremely low. With the exponential increase of clinical requirements on the stent, the defect is increasingly highlighted, and the wider application of the stent product is greatly restricted.
The problem can be well solved by mechanical and automatic weaving, and the production efficiency of the bracket is improved in multiples. Furthermore, an integrated woven stent graft can be obtained, unlike conventional stent grafts. Traditional tectorial membrane support comprises tectorial membrane, support, stylolite mostly, and the preparation process flow is: respectively manufacturing the covering film and the stent, and then connecting the covering film and the stent by adopting a manual sewing mode. Due to different suturing methods and individual differences in the manual suturing process, the quality control of a final product is very difficult, and the traditional manufacturing process for manually suturing the covered stent has the defects of low production efficiency and uneven product quality. The process flow is not easy to reach standardization and automation.
While integrally woven stent grafts can greatly improve product quality stability and production efficiency, integrally woven stent grafts still suffer from end treatment problems. After the integral woven and covered stent is woven, yarn and metal wire broken ends often exist at two ends of the stent. The treatment of yarn broken ends is easier, and no better method exists for treating the broken ends of the metal wires at present. The treatment of the broken ends of the metal wires is a key link for realizing the automatic and large-scale production of the metal stent or the integrated woven covered stent, so the problem needs to be solved.
The metal stent obtained by mechanical weaving or the metal head at the end part of the integrated woven tectorial membrane stent is processed mainly to passivate a sharp end and prevent the damage of the tissue of the cavity surface of the organ. Secondly, to secure the edges, the braided structure is prevented from loosening and fraying. Thirdly, the compressibility, self-expandability and structural stability of the stent or the covered stent in the process of delivery by a minimally invasive means can be ensured.
Disclosure of Invention
The invention aims to solve the technical problem of how to process the broken ends of the metal wires at two ends of a stent when the metal stent or the integrated woven covered stent is automatically produced in a large scale mode.
In order to solve the problems, the technical scheme adopted by the invention is to provide a W-shaped ring for passivating and fixing the end part of a braided metal support, wherein the W-shaped ring is connected with a metal support body, one end of the W-shaped ring, which is far away from the metal support body, is provided with a passivated sharp corner, and two sides of the sharp corner are provided with side edges.
The invention also provides a method for passivating and fixing the end part of the braided metal bracket by using the W-shaped ring, which comprises the following steps of:
step 1: calculating the perimeter, the number of the points and the included angle of each point of the W-shaped ring according to the morphological structure of the metal stent or the covered stent;
step 2: establishing a digital model of the W-shaped ring, drawing a drawing, and manufacturing the W-shaped ring according to the drawing;
and step 3: sleeving the W-shaped ring outside or lining the upper end of the stent or the covered stent, and enabling the sharp corner of the upper edge of the W-shaped ring to be superposed with a circle of interwoven parts on the outermost side of the stent or the covered stent;
and 4, step 4: fixing the W-shaped ring and the bracket or the film-coated bracket together;
and 5: carrying out post-treatment, removing redundant metal heads at the end part and polishing the metal heads smoothly;
step 6: and (5) repeating the steps 3 to 5, and treating the other end of the stent or the covered stent.
Preferably, the method for manufacturing the W-shaped ring in the step 2 comprises a die heat setting method, a laser engraving method and a 3D printing method.
Preferably, the material for manufacturing the W-shaped ring in the step 2 is the same as the material of the stent or the stent graft.
Preferably, the die heat setting method is used for manufacturing the W-shaped ring by using a metal die and the same metal wire as that of the stent or the stent-graft.
Preferably, the joint of the W-shaped ring prepared by adopting the die heat setting method is positioned at the midpoint of the side edge between two sharp corners of the W-shaped ring and is connected by welding;
preferably, the W-shaped ring prepared by the mold heat setting method is connected at the end by binding in the case of overlapping at both ends. Or can be fixed and connected with the stent or the covered stent together in the step 4.
Preferably, the laser engraving method for making the W-shaped ring in step 2 is to engrave a tube made of the same material as the stent or the stent graft, and the side diameter of the W-shaped ring obtained by engraving is the same as the diameter of the metal wire in the stent or the stent graft.
Preferably, the 3D printing method for manufacturing the W-shaped ring in step 2 is to perform 3D printing by using a powder material with the same material as that of the stent or the stent graft, and the side diameter of the W-shaped ring obtained by the 3D printing is the same as that of the wire in the stent or the stent graft.
Preferably, in the step 4, the W-shaped ring is fixed with the stent or the stent graft, and the fixing mode includes welding and suture fixing mode.
Preferably, when the W-shaped ring is fixed by adopting the welding mode, the welding area is limited to the middle part of the sharp-angled side edge of the W-shaped ring, and the length of the welding area does not exceed 1/2 of the side edge length of the W-shaped ring.
Preferably, when the suture line is used for fixing, a discontinuous point fixing method is used.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a method for passivating and fixing the end part of a braided metal stent by using a W-shaped ring, which is suitable for a metal stent obtained by mechanical braiding and an integrated braided covered stent.
(1) The invention solves the problem of sharp edge treatment in the automatic and large-scale production of metal stents or integrated covered stents.
(2) Compared with a possible mode of welding the end of the metal wire, the method provided by the invention has better firmness.
(3) Compared with the possible manual back-compiling and binding modes, the method provided by the invention has higher efficiency and better fixing effect.
(4) Compared with a possible metal cap riveting mode, the method provided by the invention is simple and easy to implement, and meanwhile, the fixing effect of the bracket on the cavity surface is increased, and the anti-sliding effect can be achieved.
(5) The method is simple, feasible and good in effect.
Drawings
FIG. 1 is a partial schematic view of an end of a metal stent;
FIG. 2 is a partial view of the W-ring;
FIG. 3 is a schematic view of a W-ring joint location; the positions indicated by arrows in the figure are welding positions;
FIG. 4 is a schematic view of the W-shaped ring coinciding with the end of the metal holder;
FIG. 5 is a schematic view of a welding fixture, wherein the positions indicated by arrows are welding positions;
FIG. 6 is a schematic view of a suture retaining structure, wherein the positions indicated by arrows are point-shaped retaining positions;
FIG. 7 is a schematic view of a structure in which an end portion of an excess metal head is removed and polished smooth;
Detailed Description
In order to make the invention more comprehensible, preferred embodiments accompanied with figures are described in detail below:
as shown in FIGS. 1-7, the present invention provides a W-shaped ring for bluntly securing the end of a woven metal stent, W
The W-shaped ring is connected with the metal support body, one end of the W-shaped ring, which is far away from the metal support body, is provided with a passivated sharp corner, and two sides of the sharp corner are arranged as side edges.
The invention provides a method for passivating and fixing the end part of a braided metal bracket by using a W-shaped ring, which comprises the following steps:
step 1: referring to FIG. 1, the perimeter, the number of points and the included angle of each point of the W-shaped ring of FIG. 2 are calculated according to the morphological structure of the metal stent or the stent graft.
Step 2: and establishing a digital model of the W-shaped ring, drawing a drawing, and manufacturing the W-shaped ring according to the drawing.
And 3, step 3: the W-shaped ring is sleeved outside or lined inside the upper end of the stent or the covered stent, so that the sharp angle of the upper edge of the W-shaped ring is superposed with the uppermost ring of interweaving part of the stent or the covered stent, as shown in figure 4.
And 4, step 4: the W-ring is secured to the stent or stent graft as shown in fig. 5 and 6.
And 5: and (3) post-treatment: the excess metal head at the end is removed and polished smooth as shown in fig. 7.
And 6: and (5) repeating the steps 3 to 5, and treating the other end of the stent or the covered stent.
The method for manufacturing the W-shaped ring in the step 2 comprises a die heat setting method, a laser engraving method and a 3D printing method. The material for manufacturing the W-shaped ring in the step 2 is the same as that of the stent or the covered stent.
The die heat setting method adopts a metal die and a metal wire which is made of the same material as that of the stent or the covered stent to manufacture the W-shaped ring. The joint of the W-shaped ring prepared by the mold heat setting method is positioned at the midpoint of the side edge between two sharp corners of the W-shaped ring and is welded and connected as shown in fig. 3. The joints of the W-shaped rings prepared by adopting a mould heat setting method can be connected in a binding mode; in the case where there are overlapping portions at both ends, they may be fixed and connected together with the stent or stent graft in step 4.
The laser engraving method for manufacturing the W-shaped ring in the step 2 is to engrave a pipe made of the same material as the stent or the covered stent, and the diameter of the side edge of the W-shaped ring obtained by engraving is the same as the diameter of the metal wire in the stent or the covered stent.
The 3D printing method for manufacturing the W-shaped ring in the step 2 is to perform 3D printing by adopting powder material which is the same as the material of the stent or the covered stent, and the diameter of the side edge of the W-shaped ring obtained by the 3D printing is the same as the diameter of the metal wire in the stent or the covered stent.
In the step 4, the W-shaped ring and the stent or the covered stent are fixed together, and the fixing mode comprises a welding mode or a suture fixing mode.
When the welding mode is adopted for fixing, the welding area is limited to the middle parts of two sides of the sharp corner of the W-shaped ring, and the length of the welding area does not exceed 1/2 of the side edge length of the W-shaped ring.
When the suture line is adopted for fixing, a discontinuous point fixing method is adopted.
While the invention has been described with respect to a preferred embodiment, it will be understood by those skilled in the art that the foregoing and other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention. Those skilled in the art can make various changes, modifications and equivalent arrangements, which are equivalent to the embodiments of the present invention, without departing from the spirit and scope of the present invention, and which may be made by utilizing the techniques disclosed above; meanwhile, any equivalent changes, modifications and evolutions of the above embodiments according to the essential technology of the present invention are still within the scope of the technical solution of the present invention.
Claims (12)
1. A method for passivating and fixing the end part of a woven metal bracket by using a W-shaped ring is characterized in that: the method comprises the following steps:
step 1: calculating the perimeter, the number of the points and the included angle of each point of the W-shaped ring according to the morphological structure of the metal stent or the covered stent;
step 2: establishing a digital model of the W-shaped ring, drawing a drawing, and manufacturing the W-shaped ring according to the drawing;
and step 3: sleeving a W-shaped ring outside or lining the upper end of the metal bracket or the covered bracket, so that the sharp angle of the upper edge of the W-shaped ring is superposed with one circle of interweaving parts at the outermost side of the metal bracket or the covered bracket;
and 4, step 4: fixing the W-shaped ring and the metal stent or the covered stent together;
and 5: carrying out post-treatment, removing redundant metal heads at the end part and polishing the metal heads smoothly;
step 6: and (5) repeating the steps 3 to 5, and treating the other end of the metal stent or the covered stent.
2. A method of passivating an end of a braided metallic stent with a W-ring as in claim 1, wherein: the method for manufacturing the W-shaped ring in the step 2 comprises a die heat setting method, a laser engraving method or a 3D printing method.
3. A method of passivating an end of a braided metallic stent with a W-ring as in claim 1, wherein: the material for manufacturing the W-shaped ring in the step 2 is the same as that of the stent in the metal stent or the covered stent.
4. A method of passivating a stent end of a braided metallic stent with a W-ring according to claim 2, wherein: the die heat setting method adopts a metal die and a metal wire which is the same as that of a metal stent or a stent in a covered stent to manufacture a W-shaped ring.
5. A method of passivating a stent end of a braided metallic stent with a W-ring according to claim 4, wherein: the joint of the W-shaped ring prepared by adopting the die heat setting method is positioned at the midpoint of the side edge between two sharp angles of the W-shaped ring and is welded and connected.
6. The method of passivating a braided metal stent end with a W-ring of claim 4, wherein: under the condition that two ends are overlapped, the end parts of the W-shaped ring prepared by adopting a die heat setting method are connected in a binding mode; or in the step 4, the stent is fixed and connected with a metal stent or a covered stent.
7. A method of passivating a stent end of a braided metallic stent with a W-ring according to claim 2, wherein: the laser engraving method for manufacturing the W-shaped ring in the step 2 is to engrave a pipe made of the same material as the metal stent or the covered stent, and the diameter of the side edge of the W-shaped ring obtained by engraving is the same as the diameter of a metal wire in the metal stent or the covered stent.
8. A method of passivating a stent end of a braided metallic stent with a W-ring according to claim 2, wherein: and 3D printing is carried out on the W-shaped ring manufactured in the step 2 by adopting powder material which is the same as the material of the metal stent or the covered stent, and the diameter of the side edge of the W-shaped ring obtained by 3D printing is the same as the diameter of the metal wire in the metal stent or the covered stent.
9. A method of passivating a stent end of a braided metallic stent with a W-ring according to claim 2, wherein: in the step 4, the W-shaped ring and the metal stent or the covered stent are fixed together, and the fixing mode comprises a welding mode or a suture fixing mode.
10. A method of passivating a braided metal stent end with a W-ring as in claim 9, wherein: when the W-shaped ring is fixed by adopting a welding mode, the welding area is limited to the middle part of the sharp-angle side edge of the W-shaped ring, and the length of the welding area does not exceed 1/2 of the side edge of the W-shaped ring.
11. A method of passivating a braided metal stent end with a W-ring as in claim 9, wherein: when the suture is used for fixing, a discontinuous point-like fixing method is adopted.
12. A metal stent made by the method of passivating a stent end of a braided type metal stent with a W-ring as claimed in claim 1, wherein: the W-shaped ring is connected with the metal support body, one end of the W-shaped ring, which is far away from the metal support body, is provided with a passivated sharp corner, and two sides of the sharp corner are arranged as side edges.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010650625.8A CN111759554B (en) | 2020-07-08 | 2020-07-08 | W-shaped ring and method for passivating and fixing end part of braided metal bracket by using same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010650625.8A CN111759554B (en) | 2020-07-08 | 2020-07-08 | W-shaped ring and method for passivating and fixing end part of braided metal bracket by using same |
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| CN111759554A CN111759554A (en) | 2020-10-13 |
| CN111759554B true CN111759554B (en) | 2022-07-15 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5817126A (en) * | 1997-03-17 | 1998-10-06 | Surface Genesis, Inc. | Compound stent |
| CN201701340U (en) * | 2010-06-11 | 2011-01-12 | 东华大学 | Artificial branch blood vessel stent for EVGE (endovascular graft exclusion) |
| CN102858280A (en) * | 2010-04-23 | 2013-01-02 | 美敦力瓦斯科尔勒公司 | Biodegradable stent having non-biodegradable end portions and mechanism for increased stent hoop strength |
| CN103598929A (en) * | 2013-11-28 | 2014-02-26 | 先健科技(深圳)有限公司 | Thoracic aorta covered stent |
| CN103830026A (en) * | 2014-03-04 | 2014-06-04 | 东华大学 | Biodegradable intravascular stent and production method thereof |
| CN209499979U (en) * | 2017-12-01 | 2019-10-18 | 杭州唯强医疗科技有限公司 | Highly conforming properties overlay film frame |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106073957A (en) * | 2016-06-20 | 2016-11-09 | 常州乐奥医疗科技股份有限公司 | A kind of Novel weaved intravascular stent |
-
2020
- 2020-07-08 CN CN202010650625.8A patent/CN111759554B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5817126A (en) * | 1997-03-17 | 1998-10-06 | Surface Genesis, Inc. | Compound stent |
| CN102858280A (en) * | 2010-04-23 | 2013-01-02 | 美敦力瓦斯科尔勒公司 | Biodegradable stent having non-biodegradable end portions and mechanism for increased stent hoop strength |
| CN201701340U (en) * | 2010-06-11 | 2011-01-12 | 东华大学 | Artificial branch blood vessel stent for EVGE (endovascular graft exclusion) |
| CN103598929A (en) * | 2013-11-28 | 2014-02-26 | 先健科技(深圳)有限公司 | Thoracic aorta covered stent |
| CN103830026A (en) * | 2014-03-04 | 2014-06-04 | 东华大学 | Biodegradable intravascular stent and production method thereof |
| CN209499979U (en) * | 2017-12-01 | 2019-10-18 | 杭州唯强医疗科技有限公司 | Highly conforming properties overlay film frame |
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| CN111759554A (en) | 2020-10-13 |
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