Caped stent

Abstract

An intravascular stent having a stent body and at least one cover overlying the stent body to cover the first portion of the stent body. The cover has a first region attached to the stent body and a second region unattached to the stent body. Multiple covers can be attached to the stent body in overlapping arrangement, each cover having a free unattached end. The free ends reduce the overall stiffness of the stent.

Description

CROSS-REFERENCE(S)[0001]This application is a continuation in part of application Ser. No. 16 / 214,130, filed Dec. 9, 2018, the entire the contents of which is incorporated by reference herein.FIELD OF THE INVENTION[0002]The present disclosure relates to endovascular devices used to treat aneurysms and fistulas within unhealthy blood vessels, and more particularly, to covered stents positionable within blood vessels.BACKGROUND OF THE INVENTION[0003]The prior art teaches the use of a number of devices to treat aneurysms. A common blood vessel difficulty is the persistent blood flow in the aneurysm sac extrinsic to the endograft. In fact, this is the most common complication after endovascular aneurysm repair (EVAR). Such endoleaks are ameliorated by a number of means. For example, Walzman application Ser. Nos. 15 / 732,147 and 15 / 732,365 (Publication No. 2018-0153554) teach the use of hydrogel to prevent endoleaks.[0004]The prior art also teaches endovascular coiling as a minimally inva...

AI Technical Summary

Benefits of technology

The present invention is a covered stent device that can be safely and effectively delivered and deployed in tortuous vessels to divert blood flow away from an aneurysm, fistula, or ruptured vessel while allowing blood to flow to healthy tissue distal to the treatment area and result in blood stasis and thrombus formation inside the aneurysm or fistula, and / or repair and subsequent healing of the damaged vessel. The covered stent can be used as a neuro stent or in other tortuous anatomy outside of the brain. It has a free-floating cover that is designed to optimize insertion in tortuous anatomy as the stent bends and curves during insertion through the vasculature. The cover configuration and attachment minimizes stiffness of the device and allows for bending of the stent without kinking. The covered stent is sufficiently flexible to allow its use in various applications outside of brain.

Problems solved by technology

A common blood vessel difficulty is the persistent blood flow in the aneurysm sac extrinsic to the endograft.

Endovascular coiling, however, may result in procedural complications including thromboembolism, cerebral embolization, aneurysm perforation, parent artery occlusion, coil migration, arterial dissection, and others.

However, there are currently no covered stents that are effective in the neurovascular or in severely tortuous anatomy in other parts of the body, including for example splenic artery aneurysms and pulmonary arteriovenous fistulas.

Sometimes surgical bypass is considered as well, but typically is associated with even higher rates of morbidity and mortality.

However, increased technical complications can develop following the deployment of flow diverters.

Additionally, because they do not completely block flow, they are not effective in the treatment of most fistulas and ruptured vessels.

Similarly, there is currently no effective vessel-sparing treatment of an iatrogenic rupture of an intracranial artery.

Current treatment requires closing the ruptured artery with coils and / or liquid embolics to stop the bleeding, usually with significant resulting morbidity from ischemic injury to that arterial territory.

Furthermore, when treating aneurysms with these devices, the aneurysm thromboses over time, so there is a lag period, and is not immediately cured.

This leaves the patient at risk of aneurysmal rupture during the lag period.

This can be especially problematic when treating ruptured aneurysms, which have high short-term re-rupture rates.

The prior art teaches such attachments are diffuse and located throughout the covering of the stent, along fixed intervals of the covering and frame, and consequently significantly limit flexibility of the device.

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