Stent and preparation method thereof

A technology of helical direction and metal wire, applied in the field of stents, can solve the problems of easy mutual slippage, unable to ensure the close combination and mechanical matching of the reinforced film and the stent, loss of recyclability, etc., to achieve the effect of improving radial support.

Active Publication Date: 2021-12-21
USHARE MEDICAL INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the method of invaginating multi-layer stents is to implant multiple stents together into the support lumen. If multiple retrievable stents are invaginated without fixing parts, the recyclability of the stents can be preserved, but the During the service of the stent, the stents of each layer are easy to slide against each other, and the radial reinforcement effect of the stent cannot be guaranteed; the method of adding an elastic coating is not suitable for the recyclable stent, and the coating is bonded to the main body of the stent, which affects the strength of the metal weft-knitted stent. Recyclability, and the reinforcement method using the coating cannot guarantee the tight combination and mechanical matching between the reinforcement coating and the bracket; the method of adding ribs is often used for laser engraving brackets, which are generally not recyclable, and added to weft-knitted brackets Ribs also make it lose its recyclability

Method used

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  • Stent and preparation method thereof
  • Stent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A method of preparing a bracket, the specific steps are as follows:

[0058] (1) According to the weft processes, the radiometric (25 mm having a needle diameter is 25mm, the needle number is 22 needles), resulting in a single wire (diameter of 0.12 mm) from a cylinder of the nuckel alloy. The tubular bracket, the tissue structure of the cylindrical tubular bracket is a weft flat needle tissue, and the length of the cylindrical stent is 120 mm, the inner diameter is 20 mm;

[0059] (2) figure 1 and figure 2 As shown, 4 wires of the nickel-titanium alloy (same, 0.20 mm) are used according to the pitch (60 mm), the number (4), the spiral direction (all inverse) and the wear cycle ( The cycle, n is the coil longitudinal column between the spiral metal wire 2 penetration position 3 and the wear position 4, and m is the coil cross column between the spiral metal wire 2 penetration position 3 and the wearing position 4, N And M Part 1) requires spiral feed into the cylindrical t...

Embodiment 2

[0063] A method of preparing a bracket, the specific steps are as follows:

[0064] (1) According to the weft processes, the radial molter (a needle diameter of 20 mm, the number of needles is 15 needles) is used in a single metal wire (diameter of 0.12 mm) to obtain a cylinder. The tubular support, the tissue structure of the cylindrical tubular stent is a weft flat needle tissue, and the length of the cylindrical stent is 150 mm and an inner diameter of 18 mm;

[0065] (2) image 3 As shown, 2 wires of the nickel-titanium alloy (same, 0.15 mm) are used according to the pitch (70 mm), the number (2), and the spiral direction (all inverse) and the wear cycle ( The cycle, n is the coil longitudinal column between the spiral metal wire 2 penetration position 3 and the wear position 4, and m is the coil cross column between the spiral metal wire 2 penetration position 3 and the wearing position 4, N The requirement of 2, m is 1), spirally fed into the cylindrical tubular bracket 1, s...

Embodiment 3

[0069] A method of preparing a bracket, the specific steps are as follows:

[0070] (1) According to the weft processes, the radius diameter (20 mm, the needle is 25 mm, the number of needles is 25 needles), resulting in cylindrical tubular shaping (diameter 0.14 mm) The tissue structure of the stent, the cylindrical tubular stent is the weft ribbed tissue, the length of the cylindrical tubular bracket is 100mm, the inner diameter is 18 mm; the single strand wire is formed together by 2 wires;

[0071] (2) Single wire (diameter of 0.30 mm) of medical stainless steel (5.30 mm) according to the pitch (50 mm), the number of roots (1), the spiral direction (正) and the wear cycle ( The cycle, n is a coil longitudinal column between the spiral metal wire and the wear position, m is a coil cross column number, n and m between the helical wire punctum, and the wear position. The need to spirally fed the cylindrical tubular bracket specified in the settled arc in the wearing position, so ...

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Abstract

The invention relates to a stent and a preparation method thereof. The preparation method comprises the following steps: (1) weaving a single or single-strand metal wire into a cylindrical tubular stent; (2) spirally feeding a single or a plurality of metal wires into a settlement arc at a specified penetrating-in and penetrating-out position of the cylindrical tubular bracket according to requirements of the screw pitch, the number of the metal wires, the spiral direction and the penetrating and sleeving period, so as to obtain a semi-finished product; and (3) sleeving the semi-finished product on a core rod, fixing two ends, performing heat setting, and demolding to obtain the stent. The prepared stent comprises a cylindrical tubular support and one or more spiral metal wires; spiral central axis of the spiral metal wire coincides with a central axis of the cylindrical tubular support; the spiral metal wire is sleeved in the whole area or one section of the cylindrical tubular support in a penetrating mode, and the penetrating-in position and the penetrating-out position of the spiral metal wire are located in a settlement arc of the cylindrical tubular support. The stent disclosed by the invention is good in radial enhancement effect, good in recoverability and good in flexibility.

Description

Technical field [0001] Technical Field The present invention belongs, it relates to a stent and its preparation method. Background technique [0002] Blood vessels, blood vessels and other non-cavity benign and malignant stenosis or obstruction is a common clinically serious condition, it is important palliative stenting treatment, an ideal stent requires a radial reinforcing effect, good flexibility and good performance recyclable It features, but there is a problem of traditional stand: [0003] Deformation of the wall alone restoring mechanical force to support the lumen stenosis or obstruction, it can not provide the desired mechanical support, when the continued development of stenosis or obstruction easily occurs holder is closed, resulting in cavity restenosis. [0004] Currently, various types of pipes for general structural reinforcement is added in the pipe wall reinforcing member, the reinforcing member reinforcing the common sleeve, axial ribs, radial reinforcing ring...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F2/88A61F2/86
CPCA61F2/88A61F2/885A61F2/86A61F2240/001
Inventor 林婧王璐郭爱军王富军关国平李志荣
Owner USHARE MEDICAL INC
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