Method and apparatus for controlling the deployment of a stent
Inventors
McDonald, Gary Peter • Stevenson, David Granville
Assignees
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Publication Number
US-11026823-B2
Publication Date
2021-06-08
Expiration Date
Abstract
A control system for deploying a stent graft including a resilient ring stent at one end, provides a delivery shaft carrying the stent graft with the ring stent adjacent a proximal end of the shaft for insertion into a lumen; a retractable sleeve for containing the stent graft on the delivery shaft; a control handle adjacent the distal end, of the delivery shaft; and stent peak and valley control wires extending from the proximal end of the delivery shaft to peak and valley controllers at the control handle. Use of the control wires effects movement and/or rotation of the graft allowing fine control of deployment in the lumen.
Core Innovation
The invention provides a delivery apparatus for a tubular prosthesis that includes a sleeve and at least one discrete axially-extending ring stent. The discrete axially-extending ring stent has a plurality of peaks defining a first axial end and a plurality of valleys defining a second axial end opposite the first axial end, and the peaks and valleys are alternatingly arranged and include portions that change axial directions. The discrete axially-extending ring stent is attached to the sleeve to maintain patency of the sleeve after deployment of the tubular prosthesis.
The delivery apparatus includes a delivery shaft with the tubular prosthesis mounted on a proximal end thereof for insertion into a lumen, and a retractable sleeve adapted to contain the tubular prosthesis mounted on the delivery shaft. A control handle is provided proximate to the distal end of the delivery shaft. The apparatus uses separate stent peak control wires and stent valley control wires that extend from the control handle and are physically coupled to peaks and valleys, respectively, at connection points located directly at the peaks and directly at the valleys.
Distinct peak and valley controllers are located at the control handle and are adapted to selectively open and collapse the peaks and valleys by controlling the positions of the corresponding control wires. The described deployment workflow is directed to maintaining controlled ring-stent unfolding for patency, followed by allowing controlled, reversible rotation or orientation of a saddle-shaped ring stent in a lumen. The control arrangement supports independent opening and closing of valleys and peaks via separate controllers, enabling selective deployment control while the stent is within or emerging from the retractable sleeve and in a folded configuration within the sleeve.
Claims Coverage
Independent claim clm-00001 covers a stent-graft delivery apparatus with a tubular prosthesis and sleeve, a discrete axially-extending ring stent having alternating peaks and valleys, and separate peak/valley control wires and controllers at a distal control handle. The claim contains two main inventive control feature sets: independent peak control and independent valley control, both coupled directly at the peaks/valleys, to selectively open and collapse those structures from collapsed and open states.
Discrete axially-extending ring stent with alternating peaks and valleys maintaining patency
At least one discrete axially-extending ring stent attached to the sleeve and configured to maintain patency of the sleeve after deployment, wherein the ring stent includes a plurality of peaks defining a first axial end and a plurality of valleys defining a second axial end opposite the first axial end, the plurality of peaks and valleys being alternatingly arranged and comprising portions that change axial directions.
Retractable sleeve delivery apparatus containing the tubular prosthesis on the delivery shaft
A retractable sleeve adapted to contain the tubular prosthesis mounted on a delivery shaft, the delivery shaft having a tubular prosthesis mounted on a proximal end for insertion into a lumen and a distal end remote from the proximal end.
Separate stent peak control wire coupled directly to each peak and peak controller
At least one stent peak control wire extending from the control handle and physically coupled to at least one peak at an at least one peak connection point located directly at the at least one peak, and at least one peak controller at the control handle adapted to control the position of the at least one stent peak control wire to selectively open the at least one peak from a collapsed state and collapse the at least one peak from an open state.
Separate stent valley control wire coupled directly to each valley and valley controller
At least one stent valley control wire extending from the control handle and physically coupled to at least one valley at an at least one valley connection point located directly at the at least one valley, and at least one valley controller at the control handle adapted to control the position of the at least one stent valley control wire to selectively open the at least one valley from a collapsed state and collapse the at least one valley from an open state.
The independent claim set centers on a tubular prosthesis with a discrete axially-extending ring stent whose alternating peaks and valleys are controlled independently. The system maintains sleeve patency after deployment and enables selective opening and collapsing of peaks and valleys by using distinct control wires and distinct peak and valley controllers at a control handle.
Stated Advantages
Maintains patency of the sleeve after deployment of the tubular prosthesis.
Documented Applications
Deployment of a stent-graft delivery system in a lumen, including deployment in a thoracic arch with engagement via hooks and controlled opening/closing of valleys and peaks.
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