Prosthetic Valve Baffle Structure Inducing Vortical Flow
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Solution Overview
Problem
Transcatheter prosthetic heart valves often fail to replicate the natural blood flow hemodynamics of native valves, leading to complications such as abnormal vortical flow patterns, which can affect heart function and efficiency.
Innovation Solution
A prosthetic valve design featuring a stent frame, valve structure, and baffle structure that induces vortical flow by manipulating the velocity profile of fluid exiting the valve, creating vortices or vortex rings to mimic natural blood flow patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional prosthetic valve design is used, then the valve structure is simple and easy to manufacture, but the blood flow hemodynamics are abnormal and do not replicate natural valve function
Solution Approach 1:
The valve structure is divided into multiple functional segments: the stent frame, the valve structure with leaflets, and the baffle structure with multiple baffle members. Each segment performs a specific function - the stent frame provides structural support, the valve structure controls flow direction, and the baffle members create vortical flow patterns. This segmentation allows the complex hemodynamic function to be achieved through coordinated simple components.
Solution Approach 2:
The baffle structure acts as an intermediary element between the valve structure and the outflow tract. It receives the flow from the valve structure and transforms it into the desired vortical flow pattern before the blood enters the ventricle. The baffle members serve as mediators that convert laminar flow into rotational flow, replicating natural valve hemodynamics without requiring the entire valve to be complex.
2Reliability
If a prosthetic valve without baffle structure is used, then the device complexity is low, but the velocity profile of fluid flow is uniform and does not create vortices
Solution Approach 1:
The baffle members are positioned asymmetrically within the outflow track, with different radial extensions and angular positions. This asymmetric arrangement is specifically designed to create the natural vortical flow pattern that occurs in healthy hearts. The asymmetric geometry of the baffles transforms the symmetric uniform flow from the valve into the asymmetric rotational flow needed for proper ventricular filling.
Solution Approach 2:
The baffle structure changes the flow parameters by transforming the velocity profile from uniform to non-uniform with rotational components. The baffles create localized flow acceleration and deflection that generates vorticity. By adjusting the position, size, and orientation of the baffle members, the flow parameters (velocity distribution, flow rotation, vortex strength) can be optimized to match natural valve hemodynamics.
3Reliability
If the baffle structure extends far into the outflow track, then the vortical flow is strong, but the device complexity and potential obstruction increase
Solution Approach 1:
The baffle members extend only partially across the outflow track radius, not fully from the inner wall to the outer wall. This partial extension is sufficient to generate the desired vortical flow strength while minimizing the complexity and potential obstruction. The baffles create effective flow manipulation with moderate radial extension, avoiding the need for excessive baffle size that would increase complexity and potentially obstruct flow.
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 design effectively replicates the natural blood flow profile of healthy valves, improving heart function and reducing complications by ensuring efficient ventricular ejection and synchronization of heartbeats.
Implementation Method 1
the baffle structure is configured to induce vortical flow. With this construction, the baffle structure will manipulate a natural uniform velocity profile of fluid flow from the outflow side of the valve structure, for example inducing vortices or vortical flow into fluid flow exiting from the outflow end
Data Source
AI summary
A prosthetic valve comprising a stent frame, a valve structure, and a baffle structure. The stent frame defines a lumen. The valve structure is disposed within the lumen, and defines an inflow side and an outflow side. An outflow track is established within the lumen downstream of the outflow side and along which fluid flow from the valve structure progresses. The baffle structure is connected to the stent frame downstream of the outflow side and is configured to induce vortical flow, for example including a vortex ring. In some embodiments, the prosthetic valve is a transcatheter prosthetic mitral valve having three leaflets.