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Covered stent

A covered stent and film-covered technology, which is applied in the field of medical devices, can solve problems such as adaptive bending and deformation, and achieve the effect of reducing the force on the wave coil and avoiding damage to the blood vessel wall

Pending Publication Date: 2021-12-24
广东迈迪健通科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the technical problem of adaptive bending deformation between adjacent wave coils when the bare stent is subjected to external force, the application provides a covered stent, including: a bare stent and a covered film;

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0049] refer to Figure 1 to Figure 4, the covered stent 100 provided in Embodiment 1 of the present application includes a bare stent 110 and a covered film 120 . The bare stent 110 includes a support 112 and at least two corrugations 111 arranged at intervals along a first direction, and the covering film 120 covers the bare stent 110 along the circumferential direction of the bare stent 110 along the first direction. The support member 112 is disposed between two adjacent wave coils 111 and is respectively connected to two adjacent wave coils 111; the support member 112 is defined when the force received by the wave coil 111 connected to it in the first direction is less than a preset value. The distance in the first direction of the wave coil 111 connected thereto.

[0050] In this way, by setting the support 112 between the adjacent two wave coils 111, the support 112 connects the two adjacent wave coils 111, and when the external force received by the bare bracket 110 i...

Embodiment 2

[0059] refer to Figure 5 to Figure 7 Embodiment 2 of the present application provides a stent-graft 200 . The difference between the stent-graft 200 of the second embodiment and the stent-graft 100 of the first embodiment lies in that the structure of the support member 212 is different.

[0060] The support 212 includes a first support part 2121 and a second support part 2122, the elastic modulus of the first support part 2121 is greater than the elastic modulus of the second support part 2122; the second support part 2122 is arranged on the outer periphery of the first support part 2121 On the other hand, the structure of the second supporting part 2122 includes one of strip shape, cylinder shape and spiral shape.

[0061] refer to Figure 5 , the first support portion 2121 is a solid cylindrical structure, the second support portion 2122 is a hollow cylinder, and the second support portion 2122 wraps around the outer peripheral side of the first support portion 2121 .

...

Embodiment 3

[0069] refer to Figure 8 to Figure 9 Embodiment 3 of the present application provides a stent-graft 300 . The difference between the stent-graft 300 in Embodiment 3 and the stent-graft 100 in Embodiment 1 is that the structure of the support member 312 is different.

[0070] The support 312 includes a first support part 3121 and a second support part 3122, the elastic modulus of the first support part 3121 is greater than that of the second support part 3122; the second support part 3122 is arranged on the first support part 3121 at intervals , and the axial length of the first supporting portion 3121 is greater than the axial length of the second supporting portion 3122 .

[0071] The modulus of elasticity of the first supporting part 3121 is greater than that of the second supporting part 3122, and the first supporting part 3121 is made of stainless steel or nickel-titanium alloy. In practical application, the first supporting portion 3121 is rarely deformed after being ac...

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Abstract

The invention belongs to the technical field of medical instruments, and relates to a covered stent. The covered stent comprises a bare stent and a covering film, wherein the bare stent comprises a supporting piece and at least two wave rings arranged at intervals in the first direction; and the supporting piece is arranged between the two adjacent wave rings and connected with the two adjacent wave rings. When the force borne by the supporting piece at the wave ring connected with the supporting piece in the first direction is smaller than a preset value, the distance of the wave ring connected with the supporting piece in the first direction is limited, and the covering film covers the bare stent in the circumferential direction of the bare stent in the first direction. According to the covered stent provided by the embodiment of the invention, the supporting piece is arranged between the two adjacent wave rings, and when the external force borne by the supporting piece exceeds the preset value, the supporting piece loses the supporting effect on the two adjacent wave rings, so that the distance between the two adjacent wave rings in the first direction is shortened.

Description

technical field [0001] The present application relates to the technical field of medical devices, in particular to a covered stent. Background technique [0002] Transjugular intrahepatic portocaval shunt (TIPS) is an effective method for the treatment of esophageal variceal bleeding and refractory ascites caused by portal hypertension. Under the fluoroscopy guidance of digital subtraction angiography (DSA), TIPS is punctured through the jugular vein to establish a portal vein-systemic vein shunt between the intrahepatic vein and the portal vein, which can significantly reduce the portal vein resistance structurally, which is to reduce the hepatic One of the key measures of portal pressure in cirrhotic patients. It has the characteristics of small trauma, high safety, wide indications, and remarkable short-term clinical effect, and is widely used in clinical practice. [0003] TIPS stents are divided into bare stents and covered stents. In the early use of bare stents, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F2/07
CPCA61F2/07A61F2002/072
Inventor 胡猛
Owner 广东迈迪健通科技有限公司
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