Transcatheter Valve Covering for Mitral Leak and Tissue Protection
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Solution Overview
Problem
Mitral valve replacement is challenging due to anchoring difficulties, potential damage to native tissue, and issues with size and shape mismatch between prosthetic valves and the mitral valve annulus, leading to leakage and tissue damage.
Innovation Solution
A transcatheter heart valve system with a radially expandable frame and a covering that can be attached to the prosthetic valve to protect native tissue, using anchors like rings or helical coils to secure the valve in place, and a separate covering made of biocompatible material to reduce friction and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a circular prosthetic valve is used to replace the mitral valve, then the valve can be manufactured with standard geometry, but it causes leakage around the implanted valve (paravalvular leak) because the mitral valve annulus is non-circular and larger in size
Solution Approach 1:
The patent applies a flexible covering layer that conforms to the non-circular mitral valve annulus geometry. This covering acts as an adaptive interface between the circular prosthetic valve and the irregular native annulus, eliminating gaps that would cause paravalvular leakage while maintaining the manufacturability of standard circular valve components
2Ease of operation
If the prosthetic valve is expanded inside the mitral valve annulus, then minimally invasive implantation is achieved, but the valve frame edges damage the surrounding native valve tissue
Solution Approach 1:
A flexible covering layer is applied over the prosthetic valve frame, extending beyond the frame edges to provide a protective interface with the native mitral valve tissue. This covering prevents direct contact between the rigid frame edges and the soft tissue, eliminating mechanical damage during expansion and implantation while maintaining the minimally invasive approach
Solution Approach 2:
The covering layer serves as an intermediary element between the prosthetic valve frame and the native tissue. It mediates the interaction by providing a biocompatible surface that reduces friction and prevents direct mechanical stress concentration at the frame-tissue interface, thereby protecting the tissue during the expansion process
3Stability of the object's composition
If anchors or docking stations are used to secure the prosthetic valve, then implant stability is improved, but the anchoring process may cause unintended perforation of the heart and patient injury
Solution Approach 1:
The flexible covering layer extends over the anchoring structures and provides a protective barrier during the anchoring process. This covering distributes the mechanical stresses of anchor deployment over a larger area, preventing concentration of forces that could lead to tissue perforation, while still allowing the anchors to achieve adequate fixation of the prosthetic valve
Data Source
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Figure 3
Figure 4A
AI summary
A covering layer for a transcatheter heart valve is in various embodiments configured to prevent or reduce damage to the native valve tissue around the site where the prosthetic valve is implanted. In some cases, prosthetic valves are manufactured with the covering layer attached. Other covering layers are stand-alone accessories that can be mounted onto pre-existing prosthetic valves by an end user. Covering layers that can be mounted by an end user are provided with various features that can facilitate easier attachment of the covering layer to the prosthetic valve, which further reduces the possibility of damage to the covering layer or to the valve. Another covering is provided with two layers in order to insulate and protect the native tissue surrounding the implant from damage due to friction or abrasion, and/or other movement driven wear.