Intravascular prosthesis

A blood vessel and prosthesis technology, applied in the field of endovascular prosthesis, can solve problems such as insufficient anchoring effect and too long branch stents

Pending Publication Date: 2018-03-20
SUZHOU HENRUI DISHENG MEDICAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the left and right coronary arteries can be anchored to a certain extent, because the size of the left and right coronary arteries is too small, the diameter is only 4-6mm, and the branch stents cannot be too long, and the diameter of the ascending aorta has reached more than 40mm, so anchoring still exists The problem of insufficient effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] The tubular blood vessel stent of this embodiment adopts a three-layer stent design, the outer layer is a sparse mesh closed loop stent, and the inner layer is a two-layer dense mesh woven stent. Figure 1a with Figure 1b Shows the dense mesh braided stent of this embodiment, Figure 3a with Figure 3b The open mesh braided stent of this embodiment is shown. The stent wire of the dense mesh stent is a platinum core nickel-titanium alloy wire to provide better visualization. The diameter of the stent wire of the dense mesh stent is 0.075mm, and the mesh area is 0.5mm 2 , The braiding angle is 120°, the proximal outer diameter is 45mm, the distal outer diameter is 40mm, and the length is 60mm. The diameter of the stent wire of the open-net closed-loop braided stent is 0.15mm, and the mesh area is 2mm 2 , The braiding angle is 150°, the outer diameter of the proximal end is 40mm, the outer diameter of the distal end is 35mm, and the length is 100mm.

[0114] When the tubular ...

Embodiment 2

[0117] The tubular blood vessel stent of this embodiment is similar to Embodiment 1, except that the two-layer dense mesh braided stent of this embodiment is of a flared design. Figure 2a with Figure 2b Shows the dense mesh woven stent of this embodiment, the stent wire of the dense mesh woven stent is 0.05 mm, and the mesh area is 0.3 mm 2 , Weaving angle 90°; the end is flared, the flaring angle is 15°, the flaring length is 10mm; the proximal outer diameter is 48mm, the distal outer diameter is 43mm (both unflared outer diameters); the length is 50mm. The loading and release of the tubular stent are similar to those in Example 1.

[0118] The therapeutic effect of this example is the same as that of Example 1. Compared with Example 1, because the dense mesh woven stent of Example 1 is not flared, the dense mesh woven stent of this embodiment can fit more closely to the open mesh stent. The inner surface does not shift.

Embodiment 3

[0120] The stent wire of the tubular blood vessel stent of this embodiment is nickel-titanium wire, and the stent adopts a four-layer stent design. The tubular blood vessel stent of this embodiment includes an outer layer, an inner layer and a middle layer, wherein the middle layer is a two-layer dense mesh weaving For the stent, the outer layer and the inner layer each have a layer of open mesh stents, and the weaving angle of the dense mesh stent is not equal to the weaving angle of the open mesh stent, and the braiding angles of the adjacent two layers of stents are also not equal to each other. The braiding angle of the two layers of stents differs by 15-60°, so that the adjacent braided meshes are superimposed on each other to produce a smaller mesh, which can effectively isolate and seal the blood flow of the false cavity. In addition, such as Figure 5a with Figure 5b As shown, in order to achieve a better sealing and isolation effect, the middle color of the dense mesh w...

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Abstract

The invention discloses an intravascular prosthesis. Particularly, the prosthesis comprises i layers of tubular intravascular stents, wherein 2<=i<=8, and the prosthesis is used for treating aortic dissection and arterial aneurysm lesion, particularly ascending aortic aneurysm; the tubular intravascular stents are divided into dense mesh weaved stents and sparse mesh weaved stents, the dense meshweaved stents are large in mesh density, and the sparse mesh weaved stents are small in mesh density; the quantity of the dense mesh weaved stents is m, wherein 1<=m<=4; the quantity of the sparse mesh weaved stents is n, wherein 1<=n<=4, and i=m+n; the dense mesh weaved stents and the sparse mesh weaved stents are coaxially stacked together in the circumferential direction, are used for cooperatively supporting the blood vessel and mutually limit axial stretching or shortening deformation of the stents. By means of the prosthesis in the blood vessel, through a stent interventional operation,the aortic dissection can be effectively treated, particularly the aortic dissection or arterial aneurysm incapable of being subjected to interventional treatment by current clinical medicine.

Description

Technical field [0001] The present invention relates to the field of medical devices, and more specifically to an endovascular prosthesis. Background technique [0002] Thoracic aortic dissection is not a true aneurysm, nor is it a pseudoaneurysm, but damage to the arterial intima and media due to various reasons. The blood in the aortic lumen enters the aortic media along the torn arterial intima , Forming a hematoma in the middle layer, tearing and separating the media, and peeling the aortic wall into two layers. Under the impact of blood flow, the peeled part gradually extends and expands toward the proximal and distal ends of the aorta, forming aortic blood flow False cavity. The formation of different ranges of separative expansion in the middle is called aortic dissection or aortic dissection. [0003] Aortic dissection is a common special type of thoracic aortic aneurysm. The main causes of aortic dissection are: hypertension and arteriosclerosis, connective tissue diseas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F2/07A61F2/95A61L31/14
CPCA61L31/148A61F2/07A61F2/95A61F2210/0076
Inventor 陈树国党军李峰
Owner SUZHOU HENRUI DISHENG MEDICAL CO LTD
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