Hybrid-Pattern Intravascular Stent for Sharp-Bend Flexibility
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Solution Overview
Problem
Existing intravascular stents are prone to collapse when bent around sharp angles, limiting their flexibility and effectiveness in tightly bent vessels.
Innovation Solution
A hybrid pattern intravascular stent with circumferentially self-expansible members and bridge members, featuring a combination of closed and open cells, is developed. This stent is manufactured using a thin ribbon of material that is wound around a mandrel and shaped into a desired frame, allowing for improved flexibility and radial strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If prior art stent designs are used, then scaffold strength is provided, but the stent collapses when bent around sharp angles
Solution Approach 1:
The stent is divided into multiple cell structures (closed cells and open cells) that can independently deform. The closed cells provide structural support while the open cells enable flexibility, allowing the stent to bend around sharp angles without collapsing while maintaining scaffold strength.
Solution Approach 2:
Different regions of the stent have different structural properties. The hybrid pattern creates zones with closed cells for strength and zones with open cells for flexibility, allowing the stent to simultaneously provide scaffold strength and adapt to bent vessel geometries.
2Ease of manufacture
If thin ribbon material is used, then manufacturing cost is reduced and wall thickness consistency is improved, but access to inner diameter surfaces for patterning is limited
Solution Approach 1:
The laser patterning is performed on the inner diameter surfaces of the thin ribbon stent before the stent is fully formed or deployed. This preliminary action allows access to surfaces that would be difficult to reach after stent formation, enabling groove or pattern imparting while maintaining the manufacturing advantages of thin ribbon material.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The hybrid pattern stent provides enhanced flexibility and radial strength, enabling successful implantation in more sharply bent vessels without severe buckling, while maintaining adequate scaffold strength and flow diversion properties.
Implementation Method 1
a thin ribbon of material that is wound around a mandrel and shaped into a desired stent frame shape, allowing for improved flexibility and radial strength
Data Source
AI summary
An intravascular stent and method of making an intervascular stent having a hybrid pattern a. The hybrid pattern comprises a plurality of circumferentially self-expansible members comprising a plurality of interconnected, geometrically deformable closed cells, adjacent self-expansible members interconnected by a plurality of bridge members linking a first interconnection between two closed cells in a first self-expansible member to a second interconnection between two closed cells in a second self-expansible member, wherein the second interconnection is circumferentially offset and non-adjacent to the first interconnection.