Bifurcation Stent with Non-Round Cross-Section
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing stents are not adequately designed for deployment at vessel bifurcations, as they lack the necessary structural flexibility and adaptability to effectively address stenotic lesions across multiple vessels.
Innovation Solution
A stent with three stable states: unexpanded, partially deployed, and deployed, featuring a first section that changes shape and a second section that expands, allowing for non-round to round cross-sectional transitions to accommodate bifurcation anatomy, made from various materials with different ductilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a stent has a fixed round cross-section design, then manufacturing is simple and structural strength is maintained, but it cannot adapt to bifurcation anatomy requiring non-round cross-sectional shapes
Solution Approach 1:
The stent is divided into multiple sections (first section and second section) with different expansion characteristics. The first section expands radially while the second section maintains its shape, allowing the stent to create non-round cross-sectional configurations that adapt to bifurcation anatomy while maintaining manufacturing simplicity through modular design
Solution Approach 2:
The stent transitions from a static round cross-section in its unexpanded state to dynamic non-round cross-sectional shapes in deployed states. The stent can assume multiple stable states (unexpanded, partially deployed, deployed) with different cross-sectional geometries, enabling adaptation to various anatomical configurations at vessel bifurcations
2Ease of operation
If a stent uses high ductility materials throughout, then it can be deformed easily for delivery, but it requires excessive plastic deformation to achieve stable deployed configuration
Solution Approach 1:
Different sections of the stent have different ductility properties. The first section uses high ductility materials for easy deformation during delivery and crimping, while the second section uses lower ductility materials that provide structural stability when deployed. This local differentiation allows the stent to be easily manipulated during delivery while maintaining reliable stable configuration after deployment
Solution Approach 2:
The stent utilizes changes in material ductility parameters during deployment. By selecting materials with different ductility ranges for different sections, the stent can undergo controlled plastic deformation during delivery and then achieve stable deployed configuration with minimal additional deformation, optimizing both ease of operation and reliability
3Device complexity
If a stent is designed for single-state deployment (unexpanded or deployed), then the structure is simple, but it cannot provide intermediate partially deployed configuration for controlled expansion
Solution Approach 1:
The stent is segmented into multiple sections with different expansion characteristics, enabling it to assume multiple stable states (unexpanded, partially deployed, deployed). This segmentation allows controlled intermediate expansion configurations while maintaining relatively simple overall structure through modular construction
Solution Approach 2:
The stent transitions dynamically between multiple stable states rather than being fixed in one state. The first section can expand radially while the second section maintains its shape, creating intermediate partially deployed configurations that provide adaptability for controlled expansion while the system remains structurally manageable
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
Enhances deployment flexibility and reduces plastic deformation requirements, enabling better fitment and stability across bifurcations, improving stent placement and efficacy in treating stenotic lesions.
Implementation Method 1
a stent having a non-round shaped cross-sectional shape in an unexpanded state and a round shaped cross-sectional shape in deployed states
Data Source
AI summary
A stent has a circumference and a plurality of members that define a lumen. The stent has three stable states, which include an unexpanded state, a partially deployed state, and a deployed state. The lumen has a first cross-sectional shape in the unexpanded state, a second cross-sectional shape in the partially deployed state and a third cross-sectional shape in the deployed state. The first cross-sectional shape of the lumen is different from the second and third cross-sectional shapes of the lumen, and the first cross-sectional shape of the lumen is a non-round shaped cross-sectional shape.