Stent Side Branch Petal Turn Width Geometry
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Solution Overview
Problem
Existing stents are not adequately suited for deployment at vessel bifurcations, as they often struggle with initiating outward expansion of side branch structures, which can lead to inadequate fluid communication between primary and secondary vessels.
Innovation Solution
A stent design featuring interconnected strut members with a side branch cell composed of petals, where the turn width is greater than the strut width, allowing for enhanced outward deployment during expansion, thereby improving expansion characteristics at bifurcation sites.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a side branch structure is added to provide fluid communication between primary and secondary vessels, then the stent's functional capability is improved, but the difficulty of initiating outward expansion increases
Solution Approach 1:
The patent applies local quality by creating asymmetric petal structures with varying strut widths. Specifically, the first petal has a first strut width while the second petal has a second strut width that is greater than the first strut width. This local variation in strut dimensions creates different expansion characteristics for different petals, enabling the larger-second-petal to initiate outward expansion more easily while maintaining the side branch's fluid communication function.
2Ease of operation
If the turn width is increased relative to strut width to facilitate outward deployment, then the expansion characteristics are improved, but the structural complexity increases
Solution Approach 1:
The patent employs asymmetry by designing petals with non-uniform strut widths. The first petal has a different strut width than the second petal, creating an asymmetric structure that leverages geometric differences to control expansion behavior. This asymmetric design allows specific petals to deploy outward more readily while maintaining overall structural integrity, balancing deployment ease with structural considerations.
Data Source
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AI summary
A stent (10) may include a side branch cell (30) comprising a plurality of petals (40) . Each petal may comprise struts (36) and turns (38) , and may have a longitudinal axis oriented at an angle to the stent longitudinal axis. Each petal may comprise a plurality of struts and at least one turn. For each petal, the width of a turn may be greater than the width of the struts. Upon expansion of the stent, a petal may deploy outwardly in a stent radial direction beyond an outer diameter of the rest of the stent .