Prosthetic Valve Commissure Assembly for Stable Leaflet Attachment
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Solution Overview
Problem
Existing prosthetic heart valves face challenges in forming and securing commissures, which are prone to wear and deterioration due to complex suturing and stress from cyclical forces, leading to less robust attachments and potential displacement.
Innovation Solution
The formation of commissures involves folding commissure tabs of adjacent leaflets into overlapping layers perpendicular to the frame's axial and radial directions, secured to an attachment member that protrudes from the frame, reducing stress and improving longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional suturing methods are used to form commissures, then the commissures can be attached to the frame, but the attachment is subject to wear and deterioration from cyclical forces and stress
Solution Approach 1:
A reinforcement member is introduced as an intermediary component between the commissure and the frame. The reinforcement member receives cyclical forces and stress, protecting the suture attachment points. The commissure is sutured to the reinforcement member rather than directly to the frame, creating a buffer that reduces wear on the primary attachment structure.
Solution Approach 2:
The reinforcement member is pre-installed on the frame before commissure attachment. This protective structure is in place beforehand to absorb and distribute the cyclical forces and stress that will occur during valve operation, preventing direct transmission of these forces to the suture lines and commissure tabs.
2Reliability
If commissure tabs are wrapped around the commissure support portion, then attachment is achieved, but displacement occurs including rotation and axial sliding
Solution Approach 1:
The reinforcement member serves as an intermediary structure that provides a stable, dedicated attachment surface for the commissure tabs. Instead of wrapping around the curved commissure support portion, the tabs attach to the reinforcement member which is positioned to provide optimal geometric stability, preventing rotation and axial sliding.
Solution Approach 2:
The reinforcement member is pre-positioned and secured to the frame at precise locations before commissure attachment. This preliminary action ensures that the commissure tabs have a fixed, stable reference point for attachment, eliminating the geometric uncertainties that lead to displacement during operation.
3Ease of manufacture
If vertical folding of commissure tabs is used to form commissures, then the commissures can be attached, but the attachment becomes less robust
Solution Approach 1:
The reinforcement member provides a stable intermediate attachment surface that compensates for the reduced robustness of vertically folded commissure tabs. By attaching the folded tabs to this reinforced structure rather than directly to the frame, the overall attachment strength is enhanced despite the simplified folding configuration.
Data Source
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AI summary
A prosthetic heart valve and associated methods for assembling a prosthetic heart valve including an annular frame and a plurality of leaflets is disclosed. As one example, the valve includes a plurality of commissures, each commissure including an attachment member including a protruding portion, a first commissure tab of a first leaflet of the plurality of leaflets arranged adjacent to a first side of the protruding portion and secured directly to the attachment member. Each commissure further includes a second commissure tab of a second leaflet of the plurality of leaflets arranged adjacent to an opposite, second side of the protruding portion and secured directly to the attachment member.