Controlled ingrowth feature for antimigration prosthesis
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Solution Overview
Problem
Existing stents face challenges with migration from their initial implantation site, and there is a need for controlled tissue ingrowth to enhance implant stability and integration within body lumens.
Innovation Solution
A prosthesis design featuring a scaffolding structure with a controlled tissue ingrowth feature, such as protruding elements or dimples, that abuts the inner surface of a lumen wall, promoting controlled tissue growth while preventing migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a fully covered prosthesis is used to prevent migration, then implant stability is improved, but tissue integration is reduced
Solution Approach 1:
The prosthesis applies different surface characteristics to different regions: the majority of the surface remains covered for stability, while specific localized areas feature controlled ingrowth zones with protruding elements that promote tissue integration. This spatial differentiation of surface properties resolves the contradiction between overall stability and localized tissue adaptation.
Solution Approach 2:
The prosthesis surface is segmented into distinct functional zones: covered regions for migration prevention and controlled ingrowth regions for tissue integration. The controlled ingrowth features are distributed as discrete elements rather than continuous coverage, allowing simultaneous achievement of stability and tissue integration through functional分区.
2Adaptability or versatility
If protruding elements are added to promote tissue ingrowth, then tissue integration is improved, but device complexity increases
Solution Approach 1:
The controlled ingrowth features are integrated into the existing prosthesis structure rather than being separate components. The protruding elements are formed as part of the scaffolding or cover structure during manufacturing, merging the tissue integration function with the structural framework and reducing overall device complexity.
Solution Approach 2:
The controlled ingrowth features utilize porous or textured surface structures that naturally promote tissue ingrowth without requiring complex mechanical interlocking elements. The porous architecture allows tissue penetration and integration through material properties rather than intricate geometric features.
3Duration of action of stationary object
If controlled tissue ingrowth is encouraged, then long-term stability is improved, but short-term migration risk increases
Solution Approach 1:
The controlled ingrowth features are pre-configured to initiate tissue interaction immediately upon implantation. The protruding elements and textured surfaces are designed to guide and accelerate the tissue ingrowth process from the beginning, ensuring that tissue integration begins before migration risks are fully mitigated, rather than waiting for late-stage tissue formation.
Data Source
AI summary
A tubular prosthesis that includes a scaffolding formed by at least one scaffolding filament; a cover; and at least one controlled ingrowth feature constructed and arranged to abut an inner surface of a lumen wall when the prosthesis is implanted in the body lumen. The controlled ingrowth feature may extend inwards or outwards from the prosthesis outer surface. The controlled ingrowth feature may be formed by a scaffolding filament; by a separate filament; by the cover; and combinations thereof.