US Patent No. 11,109,989

DURABLE STENT GRAFT WITH TAPERED STRUTS AND STABLE DELIVERY METHODS AND DEVICES


Patent No. 11,109,989
Issue Date September 07, 2021
Title Durable Stent Graft With Tapered Struts And Stable Delivery Methods And Devices
Inventorship Dennis Parsons, Santa Rosa, CA (US)
Christopher L. Staudenmayer, Santa Rosa, CA (US)
James R. Watson, Santa Rosa, CA (US)
Assignee TriVascular, Inc., Santa Rosa, CA (US)

Claim of US Patent No. 11,109,989


1. A self-expanding cylindrical stent which has a constrained state and a relaxed expanded state, comprising: a longitudinal axis; at least one tapered strut comprising: a proximal crown including a proximal end portion comprising a first dimension; a distal crown including a distal end portion comprising a second dimension, the distal end portion positioned opposite the proximal end portion; and a middle portion positioned approximately halfway between the proximal end portion and the distal end portion, the middle portion extending between and connecting the proximal end portion with the distal end portion, the middle portion comprising a third dimension that is smaller than the first dimension and the second dimension, wherein the at least one tapered strut tapers continuously from the proximal end portion to the middle portion, and from the distal end portion to the middle portion; a proximal end; a distal end; and a plurality of resilient struts comprising the at least one tapered strut, the plurality of resilient struts configured to exert an outward radial force when in the constrained state resulting from confinement of the stent inside an outer sheath, with two or more of the plurality of resilient struts that are non-adjacent to each other having an enlarged portion which is configured to stabilize the plurality of resilient struts while the stent is in the constrained state, and at least one resilient strut of the plurality of resilient struts is absent the enlarged portion and interposed between the non-adjacent resilient struts having the enlarged portion, the at least one resilient strut absent the enlarged portion comprises a first resilient strut absent the enlarged portion and a second resilient strut absent the enlarged portion, each comprising one or more barbs extending away from the enlarged portion of one of the two or more of the plurality of resilient struts that is adjacent to both the first and second resilient struts absent the enlarged portion, the enlarged portion comprising: a longitudinal section which is curved and enlarged in a circumferential orientation relative to the longitudinal axis of the self-expanding cylindrical stent forming an oval shape, and flat sides which are flat along a radial direction from an inside surface to an outside surface of the stent and wherein the flat sides of the enlarged portions abut and circumferentially interfere with each other with the self-expanding cylindrical stent in the constrained state.