Concentric Prosthetic Valve Frames for Secure Leaflet Alignment
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Solution Overview
Problem
Ischemic heart disease causes regurgitation of heart valves due to papillary muscle dysfunction and ventricular dilation, leading to incomplete coaptation of valve leaflets, increased stroke volume, and cardiac output reduction.
Innovation Solution
A prosthetic valve apparatus with an inner stent frame and an outer stent frame, featuring a tubular portion, coupling elements, and prosthetic leaflets, which is expandable to securely attach to the native valve, ensuring proper coaptation and reducing regurgitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single frame structure is used for the prosthetic valve, then the device complexity is reduced, but the ability to securely attach and align prosthetic leaflets is compromised
Solution Approach 1:
The frame is divided into an inner frame and an outer frame, each performing distinct functions. The inner frame provides the base structure and supports the prosthetic leaflets, while the outer frame enhances attachment security and alignment. This segmentation allows each frame component to be optimized for its specific function, improving overall reliability without requiring an overly complex integrated structure.
Solution Approach 2:
The inner frame is nested within the outer frame, creating a concentric configuration where the smaller inner frame fits inside the larger outer frame. This nesting arrangement allows both frames to work together in a compact, organized manner, providing secure attachment points and proper leaflet alignment while maintaining a manageable device complexity through hierarchical organization.
2Manufacturing precision
If the outer frame is made larger to improve leaflet alignment, then the alignment precision is improved, but the device size increases
Solution Approach 1:
The outer frame incorporates localized alignment features such as positioning ribs, engagement protrusions, and designated attachment zones that concentrate alignment functionality in specific areas rather than requiring the entire frame to be oversized. This allows precise leaflet alignment to be achieved through targeted structural elements while keeping the overall frame area compact and suitable for implantation.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 2C~2E
AI summary
Apparatus is provided for use with a prosthetic valve, the apparatus including a connector (510, 610), the connector including a flexible sheet (512, 612) that is folded to define (i) a panel (508, 608), having a first side facing in a first direction, and a second side that is opposite the first side; (ii) a leaflet receptacle (514, 614), disposed on the first side of the panel, and protruding in the first direction away from the panel; and (iii) a plurality of flaps (504, 604), each flap folded about a respective fold axis such that at least part of each flap is disposed on the second side of the panel. Other embodiments are also described.