Self-expandable segment tectorial asymmetric areolate stent

A self-expanding, non-symmetrical technology, applied in the direction of the stent, can solve the problems of acute thrombosis risk, poor release of the wall, shrinkage of the covering membrane, etc., to increase metal coverage, reduce acute thrombosis, reduce shrunken and angulated effects

Active Publication Date: 2012-05-16
SHANGHAI SIXTH PEOPLES HOSPITAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the defects of poor flexibility, low in-place rate, poor release of the curved section and shrinkage of the covering film at an angle in the intracranial application of the traditional fully covered stent, it is easy to cause internal leakage of the stent and the risk of acute thrombosis, etc....

Method used

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  • Self-expandable segment tectorial asymmetric areolate stent
  • Self-expandable segment tectorial asymmetric areolate stent
  • Self-expandable segment tectorial asymmetric areolate stent

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Such as figure 1 with figure 2 As shown, the self-expanding section-coated non-uniform interstitial stent of the present invention is composed of a stent skeleton and an outer covering membrane material 3 coated on the outside of the stent skeleton; wherein, the stent skeleton is a network tubular hollow structure, consisting of two The main support rod 1 is connected with several connecting rings 2; the connecting rings 2 connecting two main supporting frames 1 are V-shaped and arranged non-uniformly; the external film material 3 is only coated on the outside of the frame.

[0028] The stent skeletons are all processed by laser engraving, cutting and electrochemical polishing. The main support rod 1 and the connecting rod 2 of the stent skeleton are metal alloy wires of the same material that meet medical implantability standards, such as nickel-titanium shape memory alloy , nickel-titanium alloy superelastic alloy, 316 medical stainless steel and cobalt-chromium-nic...

Embodiment 2

[0033] On the basis of Example 1, the main support rods 1 are arranged in a double-helix symmetrical structure, and the apex of the V-shaped structure of the connecting ring 2 is also arranged in a spiral shape to form a secondary support shaft, which is spatially symmetrical with the helical structure of the main support rods form a quadruple helix structure.

[0034] The design of the helical structure can avoid damage to the vessel wall caused by the angulation of the stent during the release of the segmental stent in the curved section of the vessel.

Embodiment 3

[0036] On the basis of Examples 1 and 2, such as figure 2 As shown, 3 outer coating materials of the non-uniform mesh stent of the present invention are only coated on the middle section of the stent skeleton, and the two ends of the stent skeleton and the middle film covering area are loosely arranged parts of the connecting ring, and the two ends are loosely arranged. The part between the middle section and the middle section is the densely arranged part of connecting rings.

[0037] Specifically: the main struts of the loosely arranged part of the connecting rings at both ends of the stent are connected by 2 to 4 connecting rings, the closely arranged part of the second proximal end is connected by 20~30 connecting rings, and the loosely arranged part of the middle part of the stent is connected by 4~5 connecting rings. The metal coverage rate of the densely arranged part is 25%-30%, and the metal coverage rate of the loosely arranged part is 6%-8%.

[0038] The outer coa...

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Abstract

The invention provides a self-expandable segment tectorial asymmetric areolate stent for intracranial aneurysm. In the stent, a tubular hollow structure frame consists of two spirally and symmetrically arranged main support rods and asymmetrically arranged V-shaped connecting rings, and an externally applied membrane material is coated on the frame to form the stent. The releasing mode of the stent is self-expandable release, so that the stent is convenient to convey by virtue of a microcatheter system, is good in flexible performance, and is especially suitable for being applied to intracranial curved section vascular aneurismal lesion.

Description

technical field [0001] The invention relates to a minimally invasive interventional medical device product for treating aneurysms, in particular to a self-expanding section covering non-uniform mesh stent for intracranial aneurysms. Background technique [0002] Intracranial aneurysmal subarachnoid hemorrhage is one of the most common cerebrovascular diseases, its incidence is second only to cerebral infarction and hypertensive cerebral hemorrhage; the mortality rate after aneurysm rupture is as high as 40%, and the disability rate is as high as 33%. Traditional endovascular interventional treatment of aneurysms mostly uses coils to fill the aneurysm cavity, but coil embolization has many defects in materials and techniques, such as: the treatment action is inside the aneurysm cavity, which may cause intraoperative bleeding; In the aneurysm cavity, it is easy to cause postoperative mass effect; the rate of complete dense occlusion is low; the rate of postoperative recurrenc...

Claims

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Application Information

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IPC IPC(8): A61F2/90A61F2/91
Inventor 朱悦琦李明华王建波谭华桥罗七一谢志勇
Owner SHANGHAI SIXTH PEOPLES HOSPITAL
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