Dual-Layered Stent Inversion for Migration Resistance
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Solution Overview
Problem
Current stent devices face difficulties in removal and adjustment after implantation due to strong anchoring to the body lumen, leading to challenges in migration resistance and in vivo adjustments.
Innovation Solution
A dual-layered stent design with a cylindrical mesh segment formed from intersecting wires, featuring an inner and outer braided section, allowing for anchoring while enabling easy removal and adjustment by inverting one segment over the other, providing superior anti-migration properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stent is anchored to the inner wall of the lumen to prevent migration, then migration resistance is improved, but the ability to remove or shift the stent after implantation deteriorates
Solution Approach 1:
The stent is divided into multiple segments or sections along its length, with at least one segment configured to be movable relative to adjacent segments. This segmentation allows the stent to maintain anchoring through most segments while enabling removal or adjustment by moving the designated segment, thus resolving the contradiction between migration resistance and post-implantation adjustability
Solution Approach 2:
The stent incorporates dynamic elements such as telescoping sections, sliding mechanisms, or expandable/collapsible segments that allow the structure to change its configuration. These dynamic features enable the stent to transition from an anchored state during operation to a movable state for removal or repositioning, addressing both migration resistance and ease of operation
2Reliability
If the stent is designed with a dual-layered inverted structure, then migration resistance is improved through enhanced anchoring, but the device complexity increases
Solution Approach 1:
The stent employs a nested or telescoping structure where one layer is inverted and positioned within or alongside another layer. This nesting approach creates enhanced anchoring surfaces for improved migration resistance while utilizing the same wire material and maintaining a relatively simple overall structure, thus mitigating the increase in device complexity
Solution Approach 2:
One segment of the stent is inverted upon itself to create a dual-layered configuration with interlocking features. This inversion creates mechanical interengagement that significantly improves migration resistance while adding minimal structural complexity, as it essentially reconfigures existing wire elements rather than adding entirely new components
Data Source
AI summary
The present invention relates to stent structures having improved migration resistance. In particular, the invention relates to mesh stents, such as braided or twisted stent designs, where at least a portion of the stent is folded back over itself to form a multi-layered stent device. Such multi-layered portions provide for migration resistance, among other advantages.