Prosthetic Valve Baffle for Laminar Blood Flow
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Solution Overview
Problem
Current prosthetic heart valves often fail to replicate the natural hemodynamics of native valves, leading to complications such as turbulent or stagnant flow, which can result in thrombus formation and affect the normal velocity profile of blood flow.
Innovation Solution
A prosthetic valve design incorporating a stent frame and a baffle structure that modifies blood flow to eliminate or reduce turbulent and stagnant regions, promoting laminar or near-laminar flow by using a vortical or laminar flow baffle to mimic the natural flow profile of native valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional prosthetic valve structure is used, then the valve can be implanted to replace a native valve, but it fails to replicate natural hemodynamics causing turbulent or stagnant flow
Solution Approach 1:
The prosthetic valve is divided into distinct functional components: a valve structure with leaflets for flow control, a stent frame for structural support, and a baffle structure for flow direction. This segmentation allows each component to be optimized independently, with the baffle specifically designed to address flow characteristics while the valve structure handles valve function.
Solution Approach 2:
The baffle structure serves as an intermediary element between the valve structure and the outflow tract. It mediates the blood flow by redirecting it from potentially turbulent paths into a more laminar flow pattern, reducing harmful flow characteristics without compromising the valve's primary function.
2Ease of manufacture
If the valve structure is simplified for easier manufacture, then manufacturing cost and complexity are reduced, but the ability to replicate natural flow profiles is compromised
Solution Approach 1:
By separating the flow control function (valve structure) from the flow direction function (baffle structure), each component can be manufactured independently using standard techniques. The baffle's simple geometric features can be easily fabricated while the valve structure focuses on leaflet mechanics, allowing both to be manufactured with appropriate precision without excessive complexity.
Solution Approach 2:
The baffle structure incorporates localized geometric features (such as angled surfaces or vortex-generating elements) only in specific locations where flow modification is needed. This localized approach maintains manufacturing simplicity overall while achieving precise flow profile replication at critical locations where natural hemodynamics require specific flow characteristics.
3Object-generated harmful factors
If the baffle structure is added to modify blood flow, then turbulent and stagnant regions are reduced, but device complexity increases
Solution Approach 1:
The baffle structure is designed as a separate, modular component that can be independently manufactured and assembled to the stent frame. This segmentation allows the complex flow-modification function to be isolated in one component, simplifying the overall design by concentrating complexity rather than distributing it throughout the entire valve system.
Solution Approach 2:
Instead of attempting to achieve flow modification through complex valve leaflet geometries or multiple valve components, the invention inverts the approach by adding a simple baffle structure that passively redirects flow. The baffle uses basic geometric principles (angles, surfaces) to create vortex flow patterns, achieving flow modification through simplicity rather than complexity.
4Reliability
If the baffle structure is positioned downstream of the valve structure, then flow modification occurs at the optimal location, but the outflow track must be carefully designed to accommodate the baffle
Solution Approach 1:
The outflow track is designed as a distinct anatomical region separate from the valve structure and baffle. This segmentation allows the baffle to be positioned optimally for flow modification while the outflow track provides a dedicated pathway that accommodates the baffle's presence. The stent frame can be designed with asymmetric features to create the outflow track, separating the flow modification function from the structural support function.
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 baffle structure reduces the likelihood of thrombus formation and improves blood flow profiles by encouraging laminar flow, thereby enhancing the functional performance of the prosthetic valve and mimicking the natural hemodynamics of native valves.
Implementation Method 1
the baffle structure reduces the likelihood of thrombus formation and improves blood flow profiles by encouraging laminar flow
Implementation Method 2
promoting laminar or near-laminar flow by using a vortical or laminar flow baffle to mimic the natural flow profile of native valves
Implementation Method 3
using a vortical or laminar flow baffle to mimic the natural flow profile of native valves
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. In some embodiments, the baffle structure directs blood flow into designated areas to encourage laminar flow and eliminate or reduce turbulence.