Anti-endoleak stent-graft system

Abstract

The invention discloses an endoleak-prevention coated stent graft system. The endoleak-prevention coated stent graft system comprises a conveyor, a coated stent graft which can be compressed into theconveyor and can recover to the initial form after being released from the conveyor, and at least one flexible leaking stoppage part for filling a gap and connected with the coated stent graft. The flexible leaking stoppage part has a fixed end connected with the outer circumferential surface of the coated stent graft and a free end dissociated from the outer circumferential surface of the coatedstent graft, wherein the fixed end is connected with a part of the outer circumferential surface of the coated stent graft. A flexible leakproof part, without metal stent support, is made of a coatingfilm with high biocompatibility; and the flexible leakproof part without metal stent support can be better molded into the shape of the gap so as to fill the gap between two stents in the technique of ''chimney'', and to control I type endoleak.

Description

technical field [0001] The invention relates to the field of cardiovascular medical devices, in particular to an endoleak-proof membrane-covered stent system. Background technique [0002] CPG (Chimney and / or periscope graft) includes two parts: chimney technology and periscope technology. Stents or stents with membrane openings toward the proximal side are called the chimney technique, while openings toward the telecentric side are called the periscope technique. [0003] Figure 18 A schematic diagram of the treatment of the reconstruction of the branch arteries above the arch using the "chimney" technique is given. Stanford type A dissection, 3 is the vessel wall, 4 is the false lumen, and the straight-tube stent-graft 2 and the peripheral stent-graft 1 were placed side by side to reconstruct the supraarch common carotid artery and the left subclavian artery. [0004] Figure 19 A schematic diagram of the treatment of bilateral renal artery reconstruction using the "ch...

AI Technical Summary

Problems solved by technology

against Figure 18 For the above-arched branch artery shown, the sheath needs to be withdrawn towards the proximal end, which is easy to cause blood vessel damage, and the design and operation of the delivery device are relatively complicated

against figure 2 For the bilateral renal arteries shown, peripheral stents must be inserted from the brachial artery, radial artery, or ulnar artery, and the treatment is likely to be limited for patients with small access vessel diameters

[0008] 2. In view of the fact that the stent in this patent relies on the impact of blood flow to deploy the outer stent, and the outer stent 16 has no metal support, this will cause the following problem: when it is just released, the outer stent 16 is deployed randomly or attached On the inner stent 12, the blood flow cannot selectively flow into the gap between the outer stent 16 and the inner stent 12 first, if the blood flow first flows into the gap between the outer stent 16 and the vessel wall, it will flow outward The radial compressive force applied by the layer stent 16 will cause the outer layer stent 16 to fail to expand and fail to prevent internal leakage

Even if the blood flow washes away the outer stent, since one end of the outer stent 16 is hermetically connected to the inner stent 12, the blood flow is completely blocked by the "horn" between the outer stent 16 and the inner stent 12 Prevent endoleak, which will cause the impact pressure of this part to rise, and in the long run, it will cause the stent to shift, form a new dissection and hyperplasia of the vascular intima

[0009] In view of the above problems, this patent outer support 16 has provided a pressure relief hole 28, but if the pressure relief hole 28 is too large, it will not be able to prevent internal leakage, and if the pressure relief hole 28 is too small, it will easily cause the outer support 16 Part of the deformation cannot be attached to the blood vessel wall and cannot prevent internal leakage. At the same time, if the thrombus formed inside the outer stent 16 enters the brain through this small hole, it will cause complications such as cerebral infarction

Therefore, the design of the pressure relief hole is more difficult

[0010] 3. The closed end of the outer stent 16 is connected to the entire outer circumference of the inner stent 12. When the sheath is withdrawn, although the outer stent 16 will also accumulate toward the gap between the stent graft and the vessel wall, it cannot Selective accumulation in the gap between the stent-graft and the vessel wall may easily cause excessive accumulation of outer-layer stent at the bonding site of the peripheral stent-graft and the stent-graft, while insufficient outer-layer stent is accumulated in the gap between the stent-graft and the vessel wall. Layer support, so it can not play the role of anti-endleakage

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