Prosthetic Heart Valve Leaflet Design for Durability
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Solution Overview
Problem
Existing prosthetic heart valves often suffer from inadequate leaflet design, leading to insufficient opening width and increased pressure gradients, as well as reduced durability due to contact between angled inner edges and movable portions of the leaflets.
Innovation Solution
The design of prosthetic heart valves incorporates leaflets with offsetting portions and wider upper tabs that extend laterally further than lower tabs, featuring a straight inner edge parallel to the central longitudinal axis, allowing for wider opening and reducing direct contact between moving parts, thereby enhancing durability and minimizing pressure gradients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional leaflet design with angled inner edges is used, then manufacturing is simpler, but contact between angled inner edges and movable portions occurs leading to reduced durability
Solution Approach 1:
The patent applies curvature by replacing angled inner edges with curved offsetting portions that connect the upper and lower tabs. This curved geometry eliminates the angular contacts that cause wear and failure, thereby improving leaflet durability while maintaining manufacturability through standard forming processes.
Solution Approach 2:
The patent introduces a new spatial dimension by offsetting the upper tabs laterally and axially away from the free edge, creating a three-dimensional offsetting portion structure. This dimensional change eliminates direct contact between moving parts by redistributing the tab positions in multiple directions, thus improving reliability without significantly complicating manufacturing.
2Ease of operation
If narrow upper tabs are used, then device complexity is reduced, but valve opening width is insufficient causing increased pressure gradients
Solution Approach 1:
The patent increases valve opening width by offsetting upper tabs in multiple dimensions (laterally and axially), effectively utilizing three-dimensional space. This allows the tabs to extend further from the free edge without increasing planar complexity, thereby improving ease of operation (valve opening) while keeping device complexity manageable.
Solution Approach 2:
The patent employs asymmetric tab widths where upper tabs are wider than lower tabs, creating an asymmetric leaflet structure. This asymmetry allows the upper tabs to extend laterally further to increase valve opening area, while the narrower lower tabs maintain structural efficiency, thus improving ease of operation without proportionally increasing overall device complexity.
Data Source
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AI summary
Leaflets for a prosthetic heart valve are disclosed. As one example, a leaflet includes a main body with a free, outflow edge and a cusp edge portion, two lower tabs disposed on opposite sides of the main body, where the cusp edge portion terminates at upper ends thereof at the lower tabs, and the lower tabs extend laterally outward from the main body relative to a central longitudinal axis of the leaflet, and two upper tabs disposed on opposite sides of and extending laterally outward from the main body. The leaflet further includes two offsetting portions, each extending between a respective lower tab and upper tab and offsetting the respective upper tab axially and laterally away from the outflow edge of the main body, where each upper tab has opposing inner and outer edges that are parallel to one another and the central longitudinal axis of the leaflet.