Transcatheter Mitral Valve Frame Anchoring for Leak-Free Implantation
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Solution Overview
Problem
Conventional prosthetic heart valves face challenges in securely implanting in the mitral valve due to its non-circular shape and chordae tendineae, leading to issues like perivalvular leakage and LVOT obstruction, and often require a two-step implantation process with separate anchoring devices.
Innovation Solution
A prosthetic heart valve design featuring a frame with struts that curve outwardly from the frame when expanded, providing secure anchoring and engagement with surrounding tissue, and a collapsible/expandable structure that simplifies implantation without additional anchoring devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional prosthetic valves are implanted in the mitral valve, then the valve replacement function is achieved, but perivalvular leakage and LVOT obstruction occur due to the non-circular shape of the mitral valve orifice and chordae tendineae
Solution Approach 1:
The prosthetic valve frame is designed with an asymmetric, non-circular shape that specifically adapts to the elliptical or non-circular geometry of the mitral valve orifice. This asymmetric configuration allows the frame to conform to the natural anatomical shape, eliminating gaps that would cause perivalvular leakage while avoiding obstruction of the left ventricular outflow tract.
Solution Approach 2:
The frame structure incorporates locally adapted features including varying strut densities, curved engagement surfaces, and chordae tendineae accommodation zones in specific areas. These localized modifications enable the frame to seal effectively against the irregular mitral valve annulus while maintaining patency of the outflow tract, addressing specific anatomical challenges at precise locations.
2Reliability
If existing prosthetic valves are used in the mitral valve, then valve replacement is achieved, but a two-step implantation process is required with separate anchoring devices
Solution Approach 1:
The anchoring function and valve replacement function are merged into a single integrated frame structure. The frame itself incorporates anchoring features such as engagement struts, hooks, or barbs that directly secure the prosthetic valve to the mitral valve annulus, eliminating the need for separate anchoring devices and simplifying the implantation process to a single step.
Solution Approach 2:
The frame is designed as a multi-functional component that simultaneously provides structural support for the valve leaflets, anchoring to the annulus, sealing against leakage, and accommodating chordae tendineae. This universal design consolidates multiple functions into one device, reducing implantation complexity while maintaining retention stability.
3Reliability
If open-heart surgery with cardiopulmonary bypass is performed, then complete valve replacement is achieved, but significant trauma and high morbidity occur
Solution Approach 1:
The complex and traumatic components of traditional open-heart surgery, including cardiopulmonary bypass machinery and extensive surgical instrumentation, are extracted and replaced by a simplified percutaneous delivery system. The prosthetic valve is delivered through a catheter-based approach, removing the need for chest opening and mechanical life support, thereby dramatically reducing surgical trauma while maintaining complete valve replacement functionality.
4Object-affected harmful factors
If percutaneous catheterization approach is used, then surgical trauma is minimized, but secure anchoring in the mitral valve becomes challenging
Solution Approach 1:
The frame incorporates curved and arched structural elements that conform to the three-dimensional anatomy of the mitral valve annulus and surrounding tissues. These curved engagement surfaces provide mechanical interlocking with the annular tissue, ensuring secure anchoring through the percutaneous approach without requiring open surgery. The curvature allows the frame to nestle into the anatomical contours, preventing dislodgement.
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
Enhances secure anchoring and reduces complications like perivalvular leakage and LVOT obstruction, allowing for a single-step implantation process and minimizing trauma to patients.
Implementation Method 1
struts that curve outwardly from the frame when the frame expands
Implementation Method 2
the frame expands to engage tissue surrounding the prosthetic heart valve
Data Source
AI summary
A method of treating mitral valve stenosis in a human heart includes advancing a delivery apparatus through a right femoral vein, across a septal wall, and through a calcified mitral valve. A prosthetic heart valve is provided along a distal end portion of the delivery apparatus, wherein the prosthetic heart valve includes a metallic frame having a plurality of tissue-engaging elements positioned along an exterior surface and a leaflet structure for replacing the function of the calcified mitral valve. The prosthetic heart valve is radially expanded within an annulus of the calcified mitral valve such that at least some of the tissue-engaging elements of the prosthetic heart valve embed into the annulus. After radial expansion, the prosthetic heart valve is retained in position within the annulus via the tissue-engaging element and the leaflet structure replaces the function of the native mitral valve.