Valved Conduit Non-Mechanical Leaflet Attachment
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Solution Overview
Problem
Bioprosthetic heart valves face durability issues due to calcification and cusp tears, and existing fabrication techniques are labor-intensive and prone to thrombus formation, requiring a more durable and easier-to-manufacture valved conduit with improved leaflet attachment methods.
Innovation Solution
A valved conduit with non-mechanically adhered leaflets to the exterior surface of the conduit using adhesive, thermal, or chemical bonding, eliminating mechanical coupling and sinuses to reduce thrombus formation, and featuring a support frame and radiopaque markers for enhanced durability and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical fixation techniques are used to couple leaflets to the conduit, then the leaflets can be securely attached, but thrombus formation is contributed to and the manufacturing process becomes labor intensive
Solution Approach 1:
The patent replaces mechanical fixation methods (staples, sutures, clips) with non-mechanical attachment techniques including adhesive bonding, thermal bonding, and chemical bonding. This substitution eliminates the need for mechanical coupling elements that create thrombogenic surfaces, thereby reducing thrombus formation while maintaining secure leaflet attachment to the conduit
Solution Approach 2:
The patent introduces adhesive materials as intermediary substances between the leaflets and conduit surface. These adhesives serve as mediators that provide secure attachment without requiring mechanical penetration or coupling, thus avoiding the thrombogenic effects associated with mechanical fixation while ensuring reliable leaflet mounting
2Reliability
If mechanical fixation techniques are used to couple leaflets to the conduit, then the leaflets can be securely attached, but the fabrication process becomes labor intensive and failure prone
Solution Approach 1:
By replacing complex mechanical assembly processes with non-mechanical bonding techniques, the patent simplifies the fabrication workflow. Adhesive, thermal, and chemical bonding methods can be applied more uniformly and with less manual dexterity requirements, reducing labor intensity and minimizing human error in the attachment process
Solution Approach 2:
The patent changes the attachment mechanism from mechanical (discrete fastening elements) to chemical/thermal (continuous bonding). This parameter change in the attachment methodology enables more consistent and uniform leaflet-conduit coupling, reducing variability and failure rates associated with manual mechanical assembly
3Ease of operation
If the conduit includes sinuses and mechanical coupling structures, then the leaflets can be mounted, but thrombus formation is increased
Solution Approach 1:
The patent removes sinuses and mechanical coupling structures from the conduit design that would otherwise be necessary for leaflet mounting. By extracting these thrombogenic elements and replacing them with non-mechanical bonding surfaces, the patent eliminates the sources of thrombus formation while preserving the essential function of secure leaflet attachment
4Ease of manufacture
If bioprosthetic heart valves use traditional leaflet attachment methods, then the valves can be constructed, but they are prone to calcification and cusp tears requiring reoperation
Solution Approach 1:
The patent replaces mechanical attachment methods with non-mechanical bonding techniques that create more uniform and distributed stress patterns at the leaflet-conduit interface. This substitution reduces stress concentration points that would otherwise lead to fatigue failure, calcification, and cusp tears, thereby extending valve durability while maintaining construction feasibility
Solution Approach 2:
The patent employs composite attachment strategies combining adhesive bonding, thermal bonding, and chemical bonding approaches. These composite material and method approaches create multi-layered attachment systems that distribute mechanical loads more effectively, reducing the risk of single-point failures and improving overall valve longevity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances durability by minimizing thrombus formation and calcification, while simplifying manufacturing and reducing the risk of mechanical failure, thereby improving the long-term performance of bioprosthetic heart valves.
Implementation Method 1
the external portion of the at least one leaflet is adhered to the exterior surface of the conduit by adhesive, thermal bonding, or chemical bonding
Implementation Method 2
the external portion of the at least one leaflet is adhered to the exterior surface of the conduit by adhesive, thermal bonding, or chemical bonding
Implementation Method 3
the external portion of the at least one leaflet is adhered to the exterior surface of the conduit by adhesive, thermal bonding, or chemical bonding
Data Source
AI summary
Various aspects of the present disclosure are directed toward apparatuses, systems, and methods that include a valved conduit. The valved conduit may include at least one leaflet and an interior surface that mitigates against thrombus formation within the conduit.