Valve Prosthesis Anchoring Elements Mitral Annulus Widening
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Solution Overview
Problem
Existing methods for replacing the mitral valve using catheter-based prostheses face challenges in achieving stable and orthotropic anchoring due to the reliance on radial expansion forces, which are not suitable for the mitral valve, as they can cause annulus widening and are not effective against blood pressure forces during systole.
Innovation Solution
A valve prosthesis with a ring-shaped annular body and hook-shaped anchoring elements that extend into the ventricle, allowing secure anchoring to chordae, papillary muscles, or valve cusps without radial expansion, using a diabolo-shaped annular body and adjustable anchoring elements to absorb tensile forces, ensuring stable positioning and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If radial expansion forces are used to anchor the valve prosthesis, then anchoring is achieved, but the annulus widens which is harmful for mitral valve replacement
Solution Approach 1:
The anchoring function is segmented from the annular body by adding separate anchoring members that extend into the ventricle. These anchoring members can be independently configured to engage with ventricular structures (chordae, papillary muscles, or cusps) without transmitting radial expansion forces to the annulus, thus resolving the contradiction between achieving anchoring strength and preventing annulus widening.
2Stability of the object's composition
If the annular body is made rigid to support blood pressure forces, then structural stability is improved, but the ability to accommodate anatomical variations is reduced
Solution Approach 1:
The anchoring members are designed with adjustable characteristics (flexibility, length, engagement depth) that allow the prosthesis to adapt to different anatomical configurations while maintaining structural stability. The anchoring members can dynamically engage with different ventricular structures depending on the patient's anatomy, providing both stability and adaptability.
3Reliability
If anchoring elements are extended into the ventricle to absorb tensile forces, then anchoring effectiveness is improved, but device complexity increases
Solution Approach 1:
The anchoring members serve multiple functions: they provide anchoring by engaging with ventricular structures, absorb tensile forces during systole, and can be configured to work with different engagement targets (chordae, papillary muscles, or cusps). This multi-functionality improves anchoring effectiveness without proportionally increasing device complexity, as the same structural element performs multiple critical functions.
Data Source
AI summary
The invention relates to a valve prosthesis for replacing an atrioventricular valve of the heart, comprising an annular body, to which heart valve leaflets are attached and which can be inserted in the valve annulus of the heart, and further comprising at least one anchoring part, which protrudes from the annular body on the ventricle side and can be anchored in tissue.