System and method of pivoted stent deployment
View Patent ↗The invention provides a stent-graft system comprising a graft member and a stent having a connection end interconnected with the graft member and a free end opposed thereto. A belt retaining structure is provided at the stent free end. A belt is releasably retained in the belt retaining structure and is configured to constrain the stent free end independent of the stent connection end. A method of securing at least one end of a stent-graft within a vessel is also provided.
1. A method of deploying a stent-graft within a vessel, comprising:
positioning within the vessel a stent-graft in a contracted state, the stent-graft
comprising a stent and a graft with a connection end of the stent connected to an end of the graft,
the stent including a series of interconnected struts disposed between
respective crowns at the connection end and crowns disposed at a free end of the stent opposite the connection end, the stent free end including a belt retaining structure comprising a through hole provided in a plurality of crowns of the stent at the free end thereof and a belt releasably threaded through the through holes with the belt retaining the stent free end in a contracted state;
releasing the stent connection end from the contracted state within the vessel so as to allow the stent connection end to expand while the stent free end remains in the contracted state; and
thereafter releasing the belt from the through holes in the crowns of the free end and allowing the free end of the stent to expand.
2. The method of claim 1 wherein positioning the stent-graft within the vessel comprises positioning the stent-graft within a thoracic aorta.
3. The method of claim 1 wherein positioning the stent-graft within the vessel comprises positioning the stent-graft within an abdominal aorta.
4. The method of claim 1 wherein releasing the stent connection end within the vessel includes releasing an initial stage release belt which constrains the stent connection end.
5. The method of claim 1 further comprising repositioning the stent-graft within the vessel after release of the stent connection end but prior to release of the stent free end.
6. The method of claim 5 wherein repositioning the stent-graft within the vessel includes moving the stent, the graft or a combination of the stent and the graft.
7. The method of claim 5 wherein repositioning the stent-graft within the vessel includes allowing a fluid flow through the vessel to enter within the graft to self-align the stent and graft.
8. The method of claim 1 wherein releasing the belt from the through holes comprises pulling a release wire from the belt.