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Plastic covered aortic dissection stent and aortic dissection stent

A technology for aortic dissection and stent grafts, which is applied in the field of medical devices, can solve the problems of dissection breaks and poor plasticity of the proximal end of the stent graft, and achieve enhanced foldability, good radial support strength, and good flexibility Effect

Active Publication Date: 2016-07-06
HANGZHOU WEIQIANG MEDICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] The plasticity of the proximal end of the covered stent on the market is poor, and there is a certain amount of elastic straightening force, which may easily cause a new dissection breach at the proximal end of the covered stent, forming a reverse tearing A-type dissection

Method used

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  • Plastic covered aortic dissection stent and aortic dissection stent
  • Plastic covered aortic dissection stent and aortic dissection stent
  • Plastic covered aortic dissection stent and aortic dissection stent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Such as figure 1 As shown, the stent graft 100 of this embodiment is composed of a tubular membrane 150 and a plurality of independent annular stents sewn on the membrane sequentially along the axial direction. 110 (fourth type of ring stent), ring stent 120 (first type of ring stent), ring stent 130 (second type of ring stent) and ring stent 140 (third type of ring stent).

[0069] The specific quantity of each annular stent depends on the axial length of the stent graft 100 . In this embodiment, there is one annular support 110 , one annular support 120 , four annular supports 130 , and four annular supports 140 .

[0070] The covering film 150 is made of polyester cloth, and the covering film is in the shape of a straight cylinder as a whole, and each ring-shaped support is sutured on the covering film 150 by sutures 160 to form the covering film stent 100 .

[0071] Each annular support undulates along the axial direction in a wave shape while extending in the cir...

Embodiment 2

[0092] Such as Figure 6 As shown, the stent graft 200 of this embodiment is formed by the annular stent 210 , the annular stent 220 , the annular stent 230 , and the annular stent 240 , which are sutured on the membrane 250 by sutures 260 .

[0093] The difference between this embodiment and Embodiment 1 is only that the stitching method between the annular stent 230 and the membrane 250 is different. The material selection, corrugated structure, and manufacturing process of the ring bracket 230 are the same as those of the ring bracket 120 .

[0094] The suture mode of the annular stent 230 and the membrane 250 is as follows: Figure 7a As shown, between adjacent crests 222a and 222b of each annular stent 230, one crest 222b has a stitching point, and the other crest 222a has no stitching point. Such as Figure 7b As shown, from the perspective of the entire stent graft, the peaks 222b with suture points and the peaks 222a without suture points are arranged alternately al...

Embodiment 3

[0097] Such as Figure 8 As shown, the stent graft 300 of this embodiment is composed of a ring stent 310 , a ring stent 320 , a ring stent 330 , and a ring stent 340 , which are sutured on the membrane 350 by sutures 360 .

[0098] The only difference between this embodiment and Embodiment 2 is that the structure of each ring bracket 330 is different from that of the ring bracket 230 .

[0099] Such as Figure 9a As shown, the material selection and manufacturing process of the ring bracket 330 are the same as those of the ring bracket 230 , the only difference is that the wave structure is different, and there is a height difference between the two adjacent wave peaks 322 a and 322 b of each ring bracket 330 .

[0100] The suture method between the annular stent 330 and the membrane 350 is as follows: Figure 9b As shown, there is no stitching point at the upper peak 322a and there is a stitching point 370a at the lower peak 322b. Such as Figure 9c As shown, from the pe...

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Abstract

The invention discloses a plastic covered aortic dissection stent and an aortic dissection stent.The plastic covered aortic dissection stent comprises a tubular covering membrane and multiple annular supports sequentially sewn on the covering membrane in the axial direction and is characterized in that the annular supports on one part of the covering membrane are semi-sewn supports, the semi-sewn supports are provided with non-sewn areas which can be separated from the covering membrane, and the covering membrane corresponding to the internally-bent side of the non-sewn areas breaks away from the semi-sewn supports to be folded internally in a bent state.The semi-sewn supports are distributed at the bent positions after the plastic covered aortic dissection stent is implanted.The number of the semi-sewn supports is at least two sequentially-adjacent circles.When the plastic covered aortic dissection stent is bent, non-sewn areas of every two adjacent annular supports located on the internally-bent side can be overlapped, and the covering membrane in the non-sewn areas is folded towards the inside of the stent to maintain the bent state of the covered stent.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a plastic aortic dissection stent graft and an aortic dissection stent. Background technique [0002] Aortic disease mainly includes true aortic aneurysm and aortic dissection. [0003] A true aneurysm of the aorta is not a real tumor, but a pathological change in which the aorta is partially or generally dilated due to various reasons, and the aortic diameter is greater than 50% of the normal diameter. Aortic aneurysms are further divided into true aortic aneurysms and aortic pseudoaneurysms. True aortic aneurysm is an aortic aneurysm formed by lesion expansion or protrusion in the whole thickness of aortic wall and aortic aneurysm wall. Aortic pseudoaneurysm is when the arterial wall is torn or pierced, and the blood flows out from the breach and is wrapped by the tissue adjacent to the aorta to form a hematoma, which is mostly caused by trauma. [0004] Aortic disse...

Claims

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Application Information

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IPC IPC(8): A61F2/07
CPCA61F2/0077A61F2/07A61F2002/075A61F2250/0039A61F2230/0063A61F2210/0014A61F2220/0075A61F2/89A61F2002/91525A61F2002/91508A61F2/852A61F2002/828
Inventor 王永胜符伟国张庭超其他发明人请求不公开姓名
Owner HANGZHOU WEIQIANG MEDICAL TECH CO LTD
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