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Covered stent

A covered stent and film-covered technology, applied in stents, medical science, blood vessels, etc., can solve the problems of guide wires entering the window, stent displacement and thrombus, and long operation time, so as to shorten operation time and reduce branch artery damage and stenosis, the effect of reducing the probability of occurrence

Pending Publication Date: 2018-07-06
LIFETECH SCIENTIFIC (SHENZHEN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology still has the following problems: on the one hand, it is very difficult to establish a guide wire track before connecting the branch stent 2 after implanting the covered stent, and it is very difficult for the guide wire to enter the window, which will result in longer operation time and easy increase. The risk of complications such as branch artery injury and stenosis, and long-term blockage of branch arteries will cause cerebral ischemia and hypoxia and a series of brain dysfunction
Even if the proximal end of the branch stent is extended to be flush with the proximal end of the covered stent, there is still a risk that the proximal end of the branch stent will swing under the impact of blood flow, resulting in stent displacement and thrombus formation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0060] Such as image 3 and Figure 4 As shown, the stent-graft of the present invention includes a stent-graft segment 10 and a bare stent segment 20 connected to the proximal end of the stent-graft 10 . The stent graft segment 10 includes a stent body 11 and a membrane 12 covering the stent body 11 . The stent graft has the ability to expand radially, and can be compressed under external force and self-expand after the external force is removed or return to the original shape by mechanical expansion (such as balloon expansion) and maintain the original shape, so that after implanting in the lumen It can be fixed in the lumen by being close to the lumen wall through its radial support force, so as to reconstruct the blood flow channel and isolate the lesion.

[0061] Such as Figure 5-7 As shown, the membrane 12 is a hollow lumen structure with both ends open, and the lumen structure constitutes a channel for blood flow. The covering film 12 itself has a certain thickness...

no. 2 example

[0067] Such as Figure 13 and Figure 14 As shown, in this embodiment, the structure and function of the stent graft are the same as those in the previous embodiment, the difference is that the groove 21 on the film 20 in this embodiment is different from the previous embodiment. The groove 21 still includes a first curved surface 211 extending from the proximal end of the stent-graft along the axis of the stent-graft and a second curved surface 212 connected to the first curved surface 211 . Such as Figure 15 As shown, different from the previous embodiment, the first curved surface 211 includes two opposite planes 213 vertically extending toward the inside of the stent-graft and a semi-cylindrical surface 214 connecting the edges of the two planes 213 . The first curved surface 211 mainly supporting the branch bracket makes the groove 21 have a U-shaped cross-section. In this embodiment, the two planes 213 are arranged in parallel and at intervals, and the distance betwe...

no. 3 example

[0069] Such as Figure 16-18 As shown, in this embodiment, the structure and function of the stent graft are the same as those in the previous embodiment, the difference is that the groove 31 on the film 30 in this embodiment is different from the previous embodiment. The groove 31 still includes a first curved surface 311 extending from the proximal end of the stent-graft along the axis of the stent-graft and a second curved surface 312 connected to the first curved surface 311 . Such as Figure 18 As shown, the difference from the previous embodiment is that the first curved surface 311 includes two opposite planes 313 extending toward the inside of the stent-graft and an elliptical cylindrical surface 314 connecting the edges of the two planes 313 . The first curved surface 311 mainly supporting the branch bracket makes the cross-sectional shape of the groove 31 roughly U-shaped. In this embodiment, the two planes 313 are arranged in parallel and at intervals, and the dis...

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Abstract

The invention discloses a covered stent. The covered stent comprises a stent body and a tectorial membrane wrapping the surface of the stent body, the tectorial membrane is of a lumen structure with two openings formed in the two ends, the tectorial membrane is concaved by facing the interior of the covered stent to form at least one groove used for containing a branch stent, and the grooves run through at least one end of the covered stent. According to the covered stent, the grooves used for containing the branch stents are reserved in the tectorial membrane in advance, gaps between the branch stents and the covered stent are reduced to the maximum extent, and the occurrence rate of I type inner leakage is lowered.

Description

technical field [0001] The invention relates to a cardiovascular medical device, in particular to a covered stent. Background technique [0002] CPG technology includes two parts: chimney technology and periscope technology. The proximal opening of the stent or stent graft is referred to as the chimney technique, while the distal opening is referred to as the periscope technique. CPG techniques are often used when the aortic arch, visceral region of the abdominal aorta, or internal iliac arteries are preserved. figure 1 A schematic diagram of reconstruction of the bilateral renal arteries using the chimney technique is given. Abdominal aortic aneurysm 3 is treated by placing the main abdominal stent graft 2 and the branch stent 1 side by side. figure 2 A cross-sectional view of the stent-graft 2 and the branch stent 1 placed in the blood vessel 4 is given. Due to the radial extrusion force and the uneven force on the peripheral surface of the stent-graft 2 and the branch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F2/07
CPCA61F2/0077A61F2/07A61F2002/075A61F2210/00A61F2250/0058
Inventor 肖本好刘彩萍
Owner LIFETECH SCIENTIFIC (SHENZHEN) CO LTD
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