CN205758778U - A kind of intravascular stent being applicable to magnesium alloy - Google Patents

Abstract

This utility model belongs to technical field of medical instruments, it is specifically related to a kind of intravascular stent being applicable to magnesium alloy, this intravascular stent entirety network structure in a tubular form, including multiple axially aligned body supports unit, is connected by multiple dowels spaced apart between each adjacent body support unit；Described body supports unit is made up of the S-shaped unit being sequentially connected with from beginning to end, described S-shaped unit by two U-shaped bars in opposite directions, staggering is formed by connecting, the opening direction of U-shaped bar is paralleled with the axial direction of intravascular stent.The intravascular stent of this structure has stronger support force and good compliance, it is possible to carries out the surface in cut and later stage well and processes, improves stress concentration thus slow down the corrosion of support.

Description

A kind of intravascular stent being applicable to magnesium alloy

Technical field

This utility model belongs to technical field of medical instruments, is specifically related to a kind of intravascular stent being applicable to magnesium alloy.

Background technology

Coronary atherosclerotic heart disease is coronary artery generation atherosclerotic lesion and causes blood vessel Chamber stenosis or occlusion, causes myocardial ischemia, anoxia or heart disease that is downright bad and that cause, is commonly referred to as " coronary heart disease ".In recent years, Coronary heart disease increasingly becomes the big killer threatening human life.The development of interventional therapy medical domain and stent technology Gradual perfection, make intravascular stent implant surgery become treatment coronary heart disease first-selection.Intravascular stent interventional therapy operation has wound Hinder operation little, easy, be prone to arrive the advantages such as the position that cannot arrive of conventional medical device, increasingly become domestic and international medical research The focus of person's research.

At present, vascular stent material mainly has rustless steel, titanium alloy, degradable polymer, degradable magnesium alloy etc..Magnesium closes Gold is as a kind of material comprising the necessary element of human body, and its degradability and support force are better than the performance of polymer and become one Plant ideal vascular stent material.It avoids second operation and is taken out by support, decreases the damage to blood vessel wall, one Progressively can be absorbed by human body after the section time.But it is too fast that the shortcoming of magnesium alloy maximum at present is degradation speed, may not play Predetermined support effect had lost efficacy, and therefore to slow down its degradation rate very urgent in research.Its fall of the control studied at present The method solving speed mainly has the structure of intravascular stent to design, coating technology etc..

One good intravascular stent structure can improve the internal stress distribution after intravascular stent deformation, thus improves its degraded Speed.At present, the intravascular stent structure used clinically has more than 100 kinds, and researcher is all the most excellent in research both at home and abroad Good intravascular stent structure.One excellent intravascular stent structure should meet claimed below: stronger support force, good soft Pliable, less radial direction rebound degree and axial shortening rate, suitable metal coverage rate etc., but these requirements are sometimes mutual Contradiction, therefore seek one suitable " intermediate value ", reach the effect of " win-win ", just can design a kind of combination property good Intravascular stent structure.

Utility model content

This utility model aims to overcome that prior art defect, it is provided that a kind of intravascular stent being applicable to magnesium alloy, its The defects such as the support force that magnesium alloy strength can be overcome to cause not is bad, magnesium alloy micro-pipe laser cut stent difficulty.

For achieving the above object, this utility model adopts the following technical scheme that

A kind of intravascular stent being applicable to magnesium alloy, this intravascular stent entirety network structure in a tubular form, including multiple along axle To the body supports unit of arrangement, it is connected by multiple dowels spaced apart between each adjacent body support unit；Described Body supports unit is made up of the S-shaped unit being sequentially connected with from beginning to end, described S-shaped unit by two U-shaped bars in opposite directions, stagger connection and Becoming, the opening direction of U-shaped bar is paralleled with the axial direction of intravascular stent.

Preferably, described S-shaped unit by two U-shaped bars by connection strap in opposite directions, staggering is formed by connecting.Multiple S-shaped unit Connected arrangement regularly to form by dowel.S-shaped unit improves based on sinusoidal waveform, and it can improve propping up of support Support force, makes up the defect that magnesium alloy bracket intensity is the highest, and each position of structure is all passed through smooth arc transition and connected, Meet fluid dynamic requirements, will not interfere between muscle and muscle when pressure is held.Two arc radius differences bottom U-shaped bar, Ensure that position the widest for support bottom it, be the position that stress is the highest, degraded is the fastest herein.

Concrete, the middle part of described dowel is linear, and the two ends of dowel are provided with arcuate extensions, and connect The two ends of muscle are than pars intermedia bit wide 0.05-0.10mm.By multiple dowel phases spaced apart between body supports unit Even, this connection unit can improve the Laser Processing performance of magnesium alloy blood vessel rack, and what minimizing magnesium alloy too " soft " caused cuts Cut residual.Multiple dowels are spaced apart, so can reduce the metal coverage rate of support, improve its compliance.

Concrete, intravascular stent is in the axial direction including at least 6 body supports unit, and direction is at least wrapped in the circumferential Containing 6 S-shaped unit and 1-6 dowel (preferably 3 dowels).

The material selection magnesium alloy of intravascular stent.

Compared to the prior art, the beneficial effects of the utility model:

Body supports unit and dowel unit that this utility model intravascular stent structure uses all combine magnesium alloy Feature and design, body supports unit can substantially increase the support force of support, and dowel unit then can improve magnesium alloy blood The cutting performance of pipe holder, cuts out that surface quality is more preferable, the higher magnesium alloy blood vessel rack of integrity degree.It addition, this blood vessel props up Frame also has other premium properties needed for intravascular stent, such as: good compliance, relatively low radial direction rebound degree and the shortest Shrinkage etc..

Accompanying drawing explanation

Fig. 1 is the structural representation of intravascular stent described in the utility model；

Fig. 2 is the expanded view of Fig. 1；

Fig. 3 is the schematic diagram of U-shaped bar 1 in Fig. 2；

Fig. 4 is dowel and the connection diagram of U-shaped bar 1 in Fig. 2.

Detailed description of the invention

Below in conjunction with the accompanying drawings this utility model is described in further details, but protection domain of the present utility model is not limited to This.

Embodiment 1

As shown in Figures 1 to 4, a kind of intravascular stent being applicable to magnesium alloy, this intravascular stent entirety network structure in a tubular form, Including six axially aligned body supports unit, by multiple connections spaced apart between each adjacent body support unit Muscle 2 is connected；Described body supports unit is made up of the S-shaped unit being sequentially connected with from beginning to end, and described S-shaped unit is led to by two U-shaped bars 1 Cross connection strap 3 in opposite directions, staggering is formed by connecting, the opening direction of U-shaped bar 1 is paralleled with the axial direction of intravascular stent.Described company The middle part 21 connecing muscle 2 is linear, and the two ends of dowel 2 are provided with arcuate extensions 22, and the two ends of dowel 2 are than centre The widest 0.08mm in position.Intravascular stent direction in the circumferential comprises six S-shaped unit and three dowels 2.The material of intravascular stent Matter selects magnesium alloy.

Intravascular stent designed by this utility model by multiple body supports unit and dowel 2 according to certain arrangement group Conjunction is linked in sequence and forms, and support uses streamlined design everywhere, meets the optimization principles that hydrodynamics is advocated, and reduces and implants blood Damage to blood vessel wall during pipe, can reduce the resistance to blood, slow down self-corrosion, not hinder health just when Ink vessel transfusing is on active service Often function.Intravascular stent overall length is 10 ~ 30mm, and external diameter is 1.0 ~ 4.0mm, and wall thickness is 0.5 ~ 2.0mm, metal coverage rate is 7% ~ 20%.Seeing Fig. 2, body supports unit is made up of the S-shaped unit being sequentially connected with from beginning to end, and S-shaped unit is passed through even by two U-shaped bars 1 Connect bar 3 in opposite directions, staggering is formed by connecting, this structure obtains based on sine wave optimization, it is therefore an objective to improve support radial direction prop up Support force, makes up the defect that magnesium alloy bracket intensity is the highest.Seeing Fig. 3, in figure, 5 is the center of circle of inner side semicircle, and 4 is outside semicircle The center of circle, two misaligned being to ensure that in the center of circle are gradually increased to bottom support width from the middle part of U-shaped bar, because deformation of timbering Time internal stress from the middle part of U-shaped bar to bottom bracket be also gradually increased, so can slow down the degraded at bigger stress.See Fig. 4, the structure of dowel 2 is designed as that middle part 21 is linear, end sets arcuate extensions 22, and reason allows for magnesium and closes Gold compares " soft ", at the dowel 2 and portion that is connected with dowel 2 of body supports unit when laser cutting machine cutting support Position is susceptible to alloy residual, is difficult to be cut off, uses the dowel of this structure can improve this shortcoming, it is easier to cut out The support that quality is high, facilitates follow-up process.Additionally, the end portion width of dowel 2 is wider than middle part, when can not only add large deformation The width of support internal stress larger part, moreover it is possible to ensure that dowel is in smoothing junction with square wave support ring, be conducive to improving its corrosion resistance Energy and cutting performance.

Intravascular stent described in this practicality has stronger support force and good compliance, it is possible to carry out laser well The surface in cutting and later stage processes, and improves stress concentration thus slows down the corrosion of support.

It should be noted last that: above-described embodiment is merely to illustrate and unrestricted the technical solution of the utility model, appoint The equivalent that this utility model is carried out by what and amendment or local without departing from this utility model spirit and scope are replaced, and it is equal Should contain within this utility model protective scope of the claims.

Claims (5)

1. the intravascular stent being applicable to magnesium alloy, it is characterised in that this intravascular stent entirety network structure in a tubular form, including Multiple axially aligned body supports unit, by multiple dowel phases spaced apart between each adjacent body support unit Even；Described body supports unit is made up of the S-shaped unit being sequentially connected with from beginning to end, described S-shaped unit by two U-shaped bars in opposite directions, wrong Opening and be formed by connecting, the opening direction of U-shaped bar is paralleled with the axial direction of intravascular stent.

The intravascular stent being applicable to magnesium alloy the most according to claim 1, it is characterised in that described S-shaped unit is by two U Shape bar by connection strap in opposite directions, staggering is formed by connecting.

The intravascular stent being applicable to magnesium alloy the most according to claim 1, it is characterised in that the pars intermedia of described dowel Position is linear, and the two ends of dowel are provided with arcuate extensions, and the two ends of dowel are than pars intermedia bit wide 0.05-0.10mm.

The intravascular stent being applicable to magnesium alloy the most according to claim 1, it is characterised in that intravascular stent is at axial direction Upper including at least 6 body supports unit, direction includes at least 6 S-shaped unit and 1-6 dowel in the circumferential.

The intravascular stent being applicable to magnesium alloy the most according to claim 1, it is characterised in that the material of intravascular stent is magnesium Alloy.