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Thoracic aorta covered stent with degradable bare area

A thoracic aorta and stent-graft technology, applied in the field of medical devices, can solve problems such as blood vessel rupture and affect long-term effects, achieve the effect of supporting and bending, reduce the use of raw materials, and avoid scratches.

Pending Publication Date: 2020-01-24
中国人民解放军西部战区总医院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

1-3 months after the operation, vascular endothelial cells began to grow slowly into the stent, wrapping the bare area and the front end of the covered stent, the stent would no longer shift, and the bare area of ​​the stent would lose its function. Constant stimulation of the vessel wall, causing the risk of vessel rupture and affecting long-term results

Method used

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  • Thoracic aorta covered stent with degradable bare area
  • Thoracic aorta covered stent with degradable bare area
  • Thoracic aorta covered stent with degradable bare area

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] like figure 1 As shown, a bare area degradable thoracic aortic stent graft includes a fixed stent 20 and several wavy thoracic aortic stent units 11, each thoracic aortic stent unit 11 is coiled into a ring, and several coiled The annular thoracic aortic stent units 11 are arranged sequentially to form a tubular thoracic aortic stent 10; the fixed stent 20 is wave-shaped, and the fixed stent 20 is wound into a ring, and several thoracic aortic stents 10 are coated with a polyester film 30, The thoracic aortic stent 10 and the polyester film 30 are tubular as a whole, and the fixed stent 20 is divided into upper and lower parts along its radial direction, which are respectively a bare section 21 and a connecting part 22, and the connecting part 22 is arranged at one end of the polyester film 30 , the bare section 21 protrudes from one end of the polyester film 30, and the connecting part 22 is also coated with the polyester film 30; the bare section 21 of the fixing brac...

Embodiment 2

[0028] like figure 2 and image 3 As shown, this embodiment is based on Embodiment 1. Several Z-shaped frames 12 are arranged between adjacent thoracic aortic stent units 11, and the two ends of the Z-shaped frames 12 are respectively connected to adjacent thoracic aortas. Nodes of the wave-shaped structure of the bracket unit 11 . There is an interval of 1.5 cycles between two adjacent Z-shaped frames 12 in the circumferential direction of the polyester film 30 , and the adjacent Z-shaped frames 12 in the axial direction of the polyester film 30 are alternately arranged.

[0029] By setting the Z-shaped frame 12, several thoracic aortic stent units 11 can be connected into a whole, and the structure of the Z-shaped frame 12 also has a certain degree of expansion and contraction ability, and can perform certain automatic adjustments along with the expansion and contraction of the thoracic aorta stent 10. Adjustment, support effect and bending effect are better.

[0030] Th...

Embodiment 3

[0034] This embodiment is improved on the basis of Embodiment 1. The fixing bracket 20 is made of iron alloy wire. Since the material in the bare area will degrade in the artery, the stimulating effect of the bare area on the arterial wall will gradually disappear.

[0035] The rest of the structure and working principle of embodiment 3 are the same as embodiment 1.

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Abstract

The invention discloses a thoracic aorta covered stent with a degradable bare area. The thoracic aorta stent comprises a fixed stent and a plurality of wavy thoracic aorta stent units which are woundinto a ring, the thoracic aorta stents are wavy and are wound into a ring shape, the thoracic aorta stents are coated with polyester films, each thoracic aorta stent is divided into a bare area part and a connecting part in the radial direction of the thoracic aorta stent, and each connecting part is arranged at one end of the corresponding polyester film; the bare area portion of the fixed stentis made of degradable magnesium alloy or iron alloy materials, and the connecting portion and the thoracic aorta stent are made of medical stainless steel materials or nickel-titanium alloy materials.The covered stent is applied to the thoracic aorta, and the bare area of the covered stent is degradable.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a degradable thoracic aorta covered stent in the bare area. Background technique [0002] Traditional aortic covered stents generally protrude from the end of the stent with a bare area made of metal alloy (metal grid stent without polyester film), or set barbs on the outer wall of the stent, so that it can be removed during surgery. In the initial stage, the stent can be stably placed in the artery. However, with the above two fixation methods, the bare area and barbs will always remain in the artery. Over time, it will cause a certain degree of damage to the patient's artery, resulting in aortic intima and medial Membrane rupture, new aortic dissection occurs. At present, degradable bare stents have appeared in the treatment of small artery stenosis lesions such as coronary arteries, but aortic stents are basically covered stents, which mainly play an intraluminal isol...

Claims

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Application Information

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IPC IPC(8): A61F2/07
CPCA61F2/07A61F2210/0004A61F2240/001
Inventor 丁盛张近宝
Owner 中国人民解放军西部战区总医院
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