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Stent Graft

A stent-graft and support section technology, applied in stents, medical science, blood vessels, etc., can solve the problems of blood endoleak, poor sealing, failure of puncture needle opening, etc., and achieve the effect of good sealing

Active Publication Date: 2019-12-10
LIFETECH SCI (SHENZHEN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the existing in situ fenestration technology has the following problems: after the stent-graft is implanted in the body, the metal stent of the stent-graft is easily placed at the opening of the branch vessel, causing the puncture needle to open on the stent-graft at the opening of the branch vessel. hole failure
Or when part of the edge of the opening is opened along the metal stent, after the branch stent is implanted at the opening, the shape of the connecting part of the branch stent and the stent-graft is limited by the metal stent on the edge of the opening, causing the branch stent to be in contact with the covered stent. The sealing of the connecting part of the membrane stent is not good, and the blood is prone to endoleak from the connecting part

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] see Figure 2(a) to Figure 2(d) The stent-graft 100 includes a bare stent 20 and a membrane 30 covering the surface of the bare stent 20, and the stent-graft 100 is a hollow cylindrical structure. Along the length direction of the stent-graft 100, the stent-graft 100 includes a proximal support section 101, a distal support section 102, and a support section located between the proximal support section 101 and the distal support section 102 and respectively connected to the proximal support section. 101 and the fenestration section 103 connected to the distal support section 102. The fenestration section 103 includes a fenestration area 40 , and there is no bare support 20 in the fenestration area 40 .

[0044] Please also see Figure 3(a) to Figure 3(c) , the bare stent 20 includes a plurality of first wave-shaped rings 201 and at least one second wave-shaped ring 202 spaced apart from each other. The fenestration section 103 includes two first wave-shaped rings 201...

Embodiment 2

[0062] see Figure 10(a) to Figure 10(d) The structure of the stent-graft 100a of Example 2 is substantially the same as that of the stent-graft 100 of Example 1, the only difference being that the fenestration section 103a of the stent-graft 100a of Example 2 includes a longitudinal central axis close to the stent-graft 100a The direction of the concave recessed portion 60a.

[0063] Please also see Figure 11(a)-Figure 11(c) , the structure of the bare stent 20a of this embodiment is the same as that of the bare stent 20 of Embodiment 1, the only difference is that when the covering film 30a covers the bare stent 20a, the first wave-shaped ring 201a at the proximal end and the first wave-shaped ring 201a at the distal end A concave portion 60a is formed at the first waveform 201a and the second waveform ring 202a.

[0064]The recessed portion 60a includes a bottom surface 601a, a proximal peripheral surface 602a and a distal peripheral surface 603a respectively located on ...

Embodiment 3

[0076] see Figure 13(a)-Figure 13(c) , the structure of the stent-graft in Example 3 is substantially the same as that of the stent-graft 100a in Example 2, the difference is that the structure of the support 203b of the bare stent 20b in Example 3 is different from the structure of the support 203a in Example 2 .

[0077] In this embodiment, the plurality of waves protruding from the first wave-shaped ring 201b at the proximal end of the second wave-shaped ring 202b is bent toward the opening of the second wave-shaped ring 202b, and the bent wave-shaped portion forms a support The proximal bend 2032b of 203b. Specifically, the support bodies of the plurality of waves of the proximal first wave-shaped ring 201b are bent, and are bent toward the opening of the second wave-shaped ring 202b together with the distal vertices of the plurality of waves. Similarly, the plurality of waves protruding from the first wave-shaped ring 201b at the distal end of the second wave-shaped ri...

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Abstract

The invention relates to a covered stent. The stent comprises a near-end support section, a far-end support section and a fenestration section located between the near-end support section and the far-end support section and connected to the near-end support section and the far-end support section. The fenestration section comprises a first wave-shaped annulus at the near end and a first wave-shaped annulus at the far end and a second wave-shaped annulus. The fenestration section comprises a fenestration region. The first wave-shaped annulus at the near end and the first wave-shaped annulus at the far end are enclosed rings. The second wave-shaped annulus is an opened ring. A covered film covering the first wave-shaped annulus at the near end and the first wave-shaped annulus at the far end and an opening of the second wave-shaped annulus form the fenestration region. The covered stent has the following beneficial effects: when the covered stent is implanted into an aorta and the fenestration region corresponds to the arch bend of the aorta, a puncture needle can be used for opening a hole at any position of the fenestration region; the failure of hole opening is avoided due to the presence of wave-shaped annuluses; and after branch stents are inserted, no internal leakage of blood occurs.

Description

technical field [0001] The invention relates to the technical field of interventional medical devices, in particular to a covered stent for in-situ fenestration. Background technique [0002] With the sharp increase in the incidence of hypertension, the incidence of arterial-related diseases has increased significantly, and is expected to increase at a rate of more than 40% in the next 5 to 7 years. Among them, acute Stanford type A aortic dissection (acute aortic dissection type A, referred to as AADA) is the most common and dangerous aortic emergency in the field of cardiovascular surgery. If left untreated, the mortality rate of AADA one week after onset is as high as 50-91%. If only conservative medical treatment is received, the 24-hour mortality rate can reach 20%, and the 48-hour mortality rate can reach 30%. Therefore, once AADA is diagnosed, emergency surgical intervention is necessary if there are no surgical contraindications. However, even under modern medical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61F2/07
CPCA61F2/07A61F2002/072A61F2250/0069
Inventor 刘彩萍肖本好
Owner LIFETECH SCI (SHENZHEN) CO LTD
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