Stent graft delivery systems and associated methods
Inventors
Cragg, Andrew H. • Rizk, Isa • Sosnowski, Stephen • Logan, John • Dehdashtian, Mahmood • Nourian, Pedram
Assignees
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Publication Number
US-8858613-B2
Publication Date
2014-10-14
Expiration Date
Abstract
Stent graft delivery systems are disclosed herein. In several embodiments, a stent graft delivery system can include a stent graft having a proximal portion and a distal portion, a proximal sheath and a distal sheath. The proximal sheath can be configured to cover the proximal portion of the stent graft, and the distal sheath can be configured to cover the distal portion of the stent graft. The proximal sheath and the distal sheath can be independently removable from respective ends of the stent graft such that the proximal and distal portions of the stent graft are independently deployable.
Core Innovation
The invention describes delivering a stent graft to an aortic aneurysm using separately operating proximal and distal sheaths. A proximal sheath covers a proximal portion of the stent graft, and a distal sheath covers a distal portion of the stent graft, with the distal portion positioned above the aortic aneurysm before deploying the proximal portion.
Deployment is performed by retracting the proximal sheath while simultaneously advancing the proximal portion of the stent graft. The proximal sheath is retracted and the proximal portion is advanced at rates corresponding to a ratio of a deployed configuration length of the stent graft to a delivery configuration length of the stent graft.
The distal portion is then deployed by advancing the distal sheath relative to the stent graft via a central wire, followed by retracting the distal sheath through an inner lumen formed by the stent graft. A further aspect is staging relative motion during deployment while one of a proximal or distal end portions of the stent graft is held in place.
Claims Coverage
The document provides two independent method claims. Across these independent claims, the inventive features focus on coordinated deployment using independently acting sheath retraction and advancement, deployment-rate control based on a deployed-to-delivery length ratio, central-wire-mediated distal deployment, and retracting a sheath through an inner lumen formed by the stent graft.
Separately sheathed proximal and distal stent graft portions
Delivering to an aortic aneurysm a stent graft with a proximal sheath covering a proximal portion of the stent graft and a distal sheath covering a distal portion of the stent graft; positioning the distal portion above the aortic aneurysm.
Coordinated proximal sheath retraction with deployment-length ratio
Retracting the proximal sheath while simultaneously advancing a proximal portion of the stent graft to deploy the proximal portion of the stent graft, wherein the proximal sheath is retracted and the proximal portion of the stent graft is advanced at rates corresponding to a ratio of a deployed configuration length of the stent graft to a delivery configuration length of the stent graft.
Central-wire deployment of the distal portion
Advancing the distal sheath relative to the stent graft to deploy the distal portion of the stent graft via a central wire.
Distal sheath retraction through inner lumen formed by the stent graft
Retracting the distal sheath through an inner lumen formed by the stent graft.
Held end portion during sheath advancement
Holding one of a proximal or distal end portions of the stent graft in place while simultaneously advancing the sheath relative to the stent graft to deploy at least a proximal portion of the stent graft via a central wire.
Sheath advancement at deployed-to-delivery length ratio
The distal portion of the stent graft is retracted and the sheath is advanced at rates corresponding to a ratio of a deployed configuration length of the stent graft to a delivery configuration length of the stent graft.
Sheath retraction through inner lumen formed by the stent graft
Retracting the sheath through an inner lumen formed by the stent graft.
Both independent claims share coordinated deployment in which a sheath is advanced or retracted relative to a stent graft using a deployed-to-delivery configuration length ratio, with distal deployment mediated via a central wire and sheath retraction performed through an inner lumen formed by the stent graft. One claim additionally emphasizes positioning of the distal portion above the aortic aneurysm before proximal deployment.
Stated Advantages
Not explicitly described in patent.
Documented Applications
Not explicitly described in patent.
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