Covered Stent Alternating Ring Geometry for Reduced Foreshortening

The patent employs asymmetric bent segments with alternating orientations in the stent rings. Each bent segment has a specific curvature direction that alternates between adjacent segments, creating an asymmetric pattern that compensates for the constraining effect of the cover during expansion, thereby reducing foreshortening while maintaining the covered stent's luminal patency benefits

The patent applies different bend characteristics to different segments of the stent rings. By varying the curvature and orientation of bent segments locally around the stent circumference and along its length, the design optimizes expansion behavior in specific regions while maintaining overall structural integrity and reducing foreshortening throughout the device

The alternating asymmetric bent segments create a distributed mechanical pattern that reduces recoil. The asymmetric geometry allows for more uniform stress distribution during expansion and subsequent recoil, preventing the concentrated elastic recovery that causes significant recoil in conventional covered stents

The stent is divided into multiple rings with alternating bent segments, creating a segmented structure that distributes the elastic recovery forces throughout the device. This segmentation prevents localized stress concentration and reduces overall recoil while maintaining the covered stent's ability to provide uniform coverage and luminal patency