Polymeric Heart Valve Reinforcement for Fatigue and Calcification Resistance
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Solution Overview
Problem
Existing transcatheter aortic valves (TAVs) lack long-term durability data and are prone to failure due to calcification and valvular degeneration, necessitating a durable prosthetic heart valve design.
Innovation Solution
A transcatheter prosthetic heart valve with a stent frame and leaflet material, enhanced by reinforcement components, optimized through finite element modeling (FEM) for leaflet and stent design, thermoforming, and incorporation of shock absorbers and fiber reinforcement to improve durability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional bioprosthetic valves are used, then initial valve function is achieved, but long-term durability deteriorates due to calcification and valvular degeneration
Solution Approach 1:
The patent employs composite material structures combining polymeric leaflets with reinforcement components (stent frame, sewing rings, and fiber reinforcement layers). This composite approach creates a multi-material system where each component contributes specific properties: the polymeric leaflet provides flexibility and biocompatibility, while the reinforcement components provide structural strength and resistance to degeneration, thereby resolving the durability contradiction.
Solution Approach 2:
The patent incorporates reinforcement components and optimized structural designs during the manufacturing stage to preemptively counteract future degradation mechanisms. The stent frame and sewing rings are pre-installed to provide structural support before calcification and degeneration can occur, and the fiber reinforcement layers are embedded during fabrication to prevent future structural failure, thus extending service life through advance protective measures.
2Ease of operation
If polymeric materials are used for leaflets, then flexibility and biocompatibility are improved, but structural strength deteriorates without reinforcement
Solution Approach 1:
The patent creates a composite leaflet structure by combining polymeric material with reinforcement components including stent frames, sewing rings, and fiber reinforcement layers. The polymeric portion maintains flexibility and biocompatibility for natural motion, while the embedded reinforcement components provide the necessary structural strength to withstand hemodynamic forces, thus resolving the strength-f flexibility contradiction.
Solution Approach 2:
The patent applies reinforcement components at specific locations where strength is most needed: stent frames provide structural support at the leaflet attachment points, sewing rings reinforce the circumferential edges for secure anchoring, and fiber reinforcement layers are positioned at high-stress regions. This localized reinforcement strategy maintains overall leaflet flexibility while providing targeted strength enhancement where required.
3Reliability
If reinforcement components are added to enhance durability, then fatigue life is improved, but device complexity increases
Solution Approach 1:
The patent integrates multiple reinforcement functions into unified components: the stent frame serves both as a structural support element and as an attachment mechanism for the leaflets; the sewing rings combine circumferential reinforcement with anchoring functionality; and the fiber reinforcement layers are embedded within the polymeric matrix during manufacturing, creating integrated composite structures rather than separate assembled parts, thus reducing overall device complexity.
Solution Approach 2:
The patent creates integrated composite structures where reinforcement components are combined with the polymeric leaflet material during manufacturing. The fiber reinforcement layers are embedded within the polymeric matrix, and the stent frame is integrated with the leaflet attachment structures, creating unified composite components that provide both reinforcement and structural function simultaneously, thereby enhancing fatigue life without proportionally increasing component count.
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 optimized design significantly reduces stress concentration, enhances fatigue life, and achieves performance comparable to FDA-approved TAVs, with some variants lasting over 178 million cycles in accelerated wear testing.
Implementation Method 1
thermoforming a leaflet material into the shaped leaflets using the mold
Data Source
AI summary
A transcatheter prosthetic heart valve includes a stent frame and a leaflet material. The stent frame includes a top portion and a bottom portion. The leaflet material includes a lower portion attached to the stent frame and an upper portion that includes leaflets capable of moving between an open configuration and a closed configuration. At least a portion of the leaflet material weaves through the stent frame. The transcatheter prosthetic heart valve also includes one or more reinforcement components coupled to the stent frame and/or to the leaflet material to enhance performance of the transcatheter heart valve.