Transcatheter Heart Prosthesis Nested Stent Design
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Solution Overview
Problem
Existing transcatheter heart valve prostheses with dual stent designs face limitations in reducing their outer diameter in the radially compressed configuration due to the layered inner and outer stents, making it challenging to achieve a smaller packing profile for delivery.
Innovation Solution
A transcatheter valve prosthesis with a frame that includes an inflow portion, an outflow portion, and commissure bars, where in the radially compressed configuration, all components are spaced equally from the central axis, forming a single-layer tube, and in the radially expanded configuration, the frame has an outer and inner structure with the prosthetic valve attached to the inner structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a dual stent design with inner and outer stents is used, then the prosthesis can conform to native tissue and absorb forces in the radially expanded configuration, but the outer diameter cannot be sufficiently reduced in the radially compressed configuration
Solution Approach 1:
The inner stent is nested within the outer stent in a coaxial arrangement during the compressed configuration, allowing both stents to occupy the same radial space and achieve a smaller overall profile while maintaining the dual-stent structure for tissue conformity and force absorption when expanded
2Stability of the object's composition
If the inner and outer stents are layered or stacked coaxially in the radially compressed configuration, then the prosthesis maintains structural integrity, but the packing profile cannot be further reduced
Solution Approach 1:
The stents are arranged coaxially along the longitudinal axis rather than being stacked radially, allowing them to occupy the same radial envelope while maintaining structural integrity through their alternating circumferential positions when compressed, and separating into distinct radial layers when expanded
Data Source
AI summary
A transcatheter valve prosthesis includes a frame and a prosthetic valve coupled to the frame. In a radially compressed configuration, the frame is a single layer tube. In a radially expanded configuration, the frame comprises an outer structure and an inner structure, wherein the prosthetic valve attached to the inner structure, and wherein the outer structure surrounds the inner structure and is spaced from the inner structure by a gap.