CN203763305U - Coronary stent - Google Patents

Abstract

The utility model belongs to implanted medical devices for the treatment of coronary heart disease, and discloses a coronary stent. The coronary stent is characterized in that a mesh tubular base comprises at least eight supporting rings made of cobalt chromium alloy; each supporting ring is formed by connecting at least four wave-shaped units sequentially tail to tail and further comprises two semicircle rings which are jointed in an S shape; a compress spring made of nickel titanium alloy is connected between two ends of each semicircle ring, and two adjacent semicircle rings of two adjacent supporting rings are connected through an elliptic connector made of nickel titanium alloy. A conical expanding ring is arranged at each of two ends of the mesh tubular base and is made of elastic silicone rubber. Compared with the prior art, the coronary stent has the advantages of fine shrinking and expanding performance and safety for usage, and coronary restenosis can be prevented for a long term.

Description

A kind of coronary artery bracket

Technical field

This utility model belongs to the Implantable Medical Device for the treatment of coronary heart disease, specifically a kind of coronary artery bracket.

Background technology

Coronary artery bracket has developed very fast since clinical practice, and application is more and more, and percutaneous transluminal coronary stent implantation has become effective, the most the most frequently used method of Coronary Artery Disease Intervention Treatment at present.It is under the supervision of medical imaging device, utilize conduit that sacculus and coronary artery bracket intravascular are inserted to human body, and deliver to coronary stricture place, then utilize the expansion of sacculus by the vasodilation narrowing down, make to be fixed on for a long time vascular lesion place after coronary artery bracket expansion, to guarantee the treatment technology of unblocked blood flowing.Development along with percutaneous transluminal coronary stent implantation, existing coronary artery bracket has also exposed a lot of shortcomings gradually: 1. existing support is mostly through the molten netty circular tube matrix being carved into of laser by stainless steel tube, the main component of netty circular tube matrix is a plurality of waveform configurations, and the wave crest of each waveform configuration and trough shape are all very precipitous; Though the support of this structure has compliance, the dilatancy of support is bad, thereby causes expanding inhomogeneous, even at wave crest or trough place, easily produces fracture; 2. the slow releasing pharmaceutical layer of existing stainless steel stent surface-coated, curative effect is short, poor effect, narrow replapse rate is higher again to cause postoperative blood vessel; 3. after the long-term implantation of existing coronary artery bracket, along with the contraction of blood vessel wall, support easily shrinks and comes off, and human body is worked the mischief; 4. the easily adsorption precipitation of existing coronary artery bracket surface, causes the implanted treatment effect of support not good enough.

Utility model content

Applicant finds the problems referred to above in Vasculocardiology Deparment work for many years, through exploring and research, object is to provide a kind of favorable expandability, easy fracture, fixation, result of use are not good, has the coronary artery bracket of long-range curative effect simultaneously, can greatly reduce postoperative blood vessel narrow probability again.

This utility model is that the technical scheme that its technical problem of solution is taked is, design a kind of coronary artery bracket, comprise netty circular tube matrix, wherein said netty circular tube matrix comprises at least eight bracing rings that adopt cochrome to make, these at least eight bracing rings are being axially evenly arranged along described netty circular tube matrix, each bracing ring is again by least four waveform unit end to end composition in turn, each waveform unit comprises again two semicircular ring, two semicircular ring are spliced into serpentine, between two end points of each semicircular ring, be connected with a Compress Spring of being made by Nitinol, two semicircular ring mutually close between adjacent two bracing rings are connected by an oval connector of being made by Nitinol, the surface of described netty circular tube matrix is coated with nano crystallizing layer, glutin layer successively from inside to outside, and at outer surface absorption one deck C-myc of glutin layer antisense oligonucleotide, at the two ends of described netty circular tube matrix, being respectively arranged with an expansion of being made by elastic silicone rubber encloses, after described expansion circle expansion, be cone tubular, the circle pars intramuralis of expansion circle is provided with vacuum impregnating sap cavity, on the circle wall of expansion circle, be provided with the unidirectional liquid inlet being connected with vacuum impregnating sap cavity, on unidirectional liquid inlet, be connected with dismountable topping up flexible pipe, one end that described expansion circle internal diameter is less is fixedly connected with described netty circular tube matrix, one end that internal diameter is larger stretches out, and the internal diameter of one end that described expansion circle internal diameter is less is identical with the internal diameter of netty circular tube matrix.

This utility model adopts after technique scheme, its netty circular tube matrix is that the bracing ring of the waveform made by cochrome and the oval connector of being made by Nitinol form, the bracing ring of the waveform that wherein cochrome is made has good mechanical performance, intensity is higher than three times of rustless steels, the good advantage of corrosion resistance and biocompatibility, so the contraction of the bracing ring of the waveform that cochrome is made and scalability are all fine, particularly wave crest and the trough in conjunction with bracing ring is semicircular construction features, improved widely this New-support contraction scalability diametrically, after shrinking, volume is little, after expansion, intensity is high, easy fracture not, shape remains unchanged for a long period of time, and the oval connector that Nitinol is made has unique shape memory function, also there is the advantages such as wear-resistant, anticorrosive, high damping and super-elasticity, when particularly its oval-shaped structure is shunk expansion, stressed being evenly difficult for ruptures, effectively increase the axial expansion shrinkage of this New-support, be convenient to the implantation of support and accurately place, same Nitinol is made Compress Spring due to the further supporting bracket shape diametrically of the advantages such as high damping and super-elasticity, guarantees the support shape that remains unchanged for a long period of time.In addition, the outer surface of matrix of this novel coronary artery bracket is coated with nano crystallizing layer successively, glutin layer, and at outer surface absorption one deck C-myc of glutin layer antisense oligonucleotide, coated with nano crystallizing layer wherein, can make matrix there is high case hardness, low coefficient of friction, better corrode and wear resistance, gelatin coating albumin layer object is to utilize the adsorptivity of glutin that C-myc antisense oligonucleotide is adsorbed on glutin layer for a long time, C-myc antisense oligonucleotide discharges gradually at coronary lesions position, the effect of performance anticoagulation and inhibition smooth muscle neointimal hyperplasia, reach the object that reduces arteria coronaria acute occlusion in art and prevent for a long time arteria coronaria postoperative restenosis, in order further to prevent restenosis, through well-designed, adopted unique cone tubular expansion coil structures, blood is when flowing through support, because expansion circle is the cone tubular inwardly shrinking, the whole two ends of support internal diameter is larger, stage casing internal diameter is narrower, the flow velocity of blood in support increased, the blood that increases flow velocity forms and washes away rack inner wall, prevented precipitation and the absorption of condensed material on rack inner wall in blood, can guarantee to a certain extent that support is unimpeded, improve the result of use of support.In sum, this novel coronary artery bracket, has advantages of that the scalability of contraction is good, it is safe to use, and can prevent for a long time the generation of arteria coronaria postoperative restenosis simultaneously.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, this utility model is further described, its structure and advantage will be clearer.

Fig. 1 is the expanded view of a kind of coronary artery bracket of this utility model;

Fig. 2 is the structural representation of single waveform unit in a kind of coronary artery bracket of this utility model;

Fig. 3 is the structural representation of expansion circle in a kind of coronary artery bracket of this utility model;

Fig. 4 is the interlayer structure schematic diagram between nanocrystal layer, glutin layer and the C-myc antisense oligonucleotide that in a kind of coronary artery bracket of this utility model, netty circular tube matrix surface applies.

The specific embodiment

Referring to Fig. 1-4, a kind of coronary artery bracket, comprise netty circular tube matrix 1, wherein, described netty circular tube matrix 1 comprises at least eight bracing rings 2 that adopt cochrome to make, these at least eight bracing rings 2 are being axially evenly arranged along described netty circular tube matrix 1, each bracing ring 2 is again by least four waveform unit 3 end to end composition in turn, each waveform unit 3 comprises again two semicircular ring, two semicircular ring are spliced into serpentine, between two end points of each semicircular ring, be connected with a Compress Spring of being made by Nitinol 4, two semicircular ring mutually close between adjacent two bracing rings 2 are connected by an oval connector 5 of being made by Nitinol, the surface of described netty circular tube matrix 1 is coated with nano crystallizing layer 6, glutin layer 7 successively from inside to outside, and at outer surface absorption one deck C-myc of glutin layer 7 antisense oligonucleotide 8, at the two ends of described netty circular tube matrix 1, be respectively arranged with an expansion circle 9 of being made by elastic silicone rubber, after described expansion circle 9 expansions, be cone tubular, the circle pars intramuralis of expansion circle 9 is provided with vacuum impregnating sap cavity 10, on the circle wall of expansion circle 9, be provided with the unidirectional liquid inlet being connected with vacuum impregnating sap cavity 10, on unidirectional liquid inlet, be connected with dismountable topping up flexible pipe 11, described expansion is enclosed one end that 9 internal diameters are less and is fixedly connected with described netty circular tube matrix 1, one end that internal diameter is larger stretches out, the internal diameter that one end that 9 internal diameters are less is enclosed in described expansion is identical with the internal diameter of netty circular tube matrix 1.

Before implantation, whole coronary artery bracket is in contraction state, and wherein, bracing ring 2 is to be mainly radial contraction, and Compress Spring 4 is mainly radial contraction, and oval connector 5 is mainly axial shrinkage, and expansion circle 9 is mainly radial and axial time to shrink; In implantation, first the support shrinking is imported in arteria coronaria blood vessel, by conventional dilating sacculus, make coronary artery bracket expansion fixing, by topping up flexible pipe 11, to the vacuum impregnating sap cavity 10 of expanding circle 9, injecting physiological fluids again makes expansion circle 9 expand into cone tubular, further fixedly coronary artery bracket after 9 expansions of expansion circle, a little firmly remove topping up flexible pipe 11 and dilating sacculus, complete implantation process, whole implantation process is carried out hemostasis and is processed.

Described nanocrystal layer 6 adopts ultrasonic nano treatment technology to form, nanocrystal layer 6 thickness≤15um.The principle that ultrasonic nanoization is processed is: adopt the hard bullet that high-power ultrasound wave dither is spherical, make surface of the work be subject in a short period of time a large amount of bullet dresses and clash into.With untreated cochrome matrix phase ratio, the cochrome matrix after ultrasonic nanoization is processed has high case hardness, better corrosion and wear resistance; After gelatin coating albumin layer 7, can utilize the adsorptivity of glutin that C-myc antisense oligonucleotide 8 is adsorbed on glutin layer 7 muchly in the mode of soaking, after support is implanted, C-myc antisense oligonucleotide 8 can discharge gradually at coronary lesions position, performance anticoagulation and suppress the effect of smooth muscle neointimal hyperplasia, reaches the object that reduces arteria coronaria acute occlusion in art and prevent for a long time arteria coronaria postoperative restenosis.

Claims (1)

1. a coronary artery bracket, comprise netty circular tube matrix, it is characterized in that: described netty circular tube matrix comprises at least eight bracing rings that adopt cochrome to make, these at least eight bracing rings are being axially evenly arranged along described netty circular tube matrix, each bracing ring is again by least four waveform unit end to end composition in turn, each waveform unit comprises again two semicircular ring, two semicircular ring are spliced into serpentine, between two end points of each semicircular ring, be connected with a Compress Spring of being made by Nitinol, two semicircular ring mutually close between adjacent two bracing rings are connected by an oval connector of being made by Nitinol, the surface of described netty circular tube matrix is coated with nano crystallizing layer, glutin layer successively from inside to outside, and at outer surface absorption one deck C-myc of glutin layer antisense oligonucleotide, at the two ends of described netty circular tube matrix, being respectively arranged with an expansion of being made by elastic silicone rubber encloses, after described expansion circle expansion, be cone tubular, the circle pars intramuralis of expansion circle is provided with vacuum impregnating sap cavity, on the circle wall of expansion circle, be provided with the unidirectional liquid inlet being connected with vacuum impregnating sap cavity, on unidirectional liquid inlet, be connected with dismountable topping up flexible pipe, one end that described expansion circle internal diameter is less is fixedly connected with described netty circular tube matrix, one end that internal diameter is larger stretches out, and the internal diameter of one end that described expansion circle internal diameter is less is identical with the internal diameter of netty circular tube matrix.