Mitral Valve Dilation Device Asymmetric Posterior Annulus
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Solution Overview
Problem
Accurately simulating mitral annular dilation in ex vivo experimentation is challenging due to the asymmetric dilation of the mitral annulus, which is crucial for understanding the biomechanics of mitral regurgitation and designing optimal annuloplasty rings.
Innovation Solution
A valve dilation device that mimics the D-shape of a natural mitral valve annulus, selectively dilating the posterior annulus with minimal dilation of the anterior annulus, using a system of overlapping blades and a pivot plate to achieve a continuous dilation profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a representative disease model is used to simulate mitral annular dilation, then understanding of MR biomechanics is improved, but accurately simulating asymmetric posterior annular dilation is difficult
Solution Approach 1:
The dilation device is divided into multiple independent blades (anterior blade and posterior blades) that can be controlled separately. The posterior blades are connected to adjustment cords that can be independently adjusted to apply differential dilation forces, enabling accurate simulation of asymmetric posterior annular dilation while maintaining manageable device complexity through modular design
Solution Approach 2:
The device applies different dilation characteristics to different regions of the annulus. The posterior blades are specifically designed to dilate the posterior annulus more than the anterior annulus, creating the asymmetric dilation pattern that accurately represents in vivo mitral valve disease while keeping the overall device structure relatively simple
2Adaptability or versatility
If adjustable segments are used to dilate the annulus, then some annular dilation can be achieved, but continuous dilation profile and convenient testing under varying dilation amounts are not obtained
Solution Approach 1:
The device employs adjustment cords that can be dynamically adjusted to varying lengths, allowing continuous modification of the dilation profile. This enables the device to simulate different degrees of annular dilation conveniently, improving adaptability for testing various dilation conditions while maintaining ease of operation through simple cord adjustment mechanisms
Solution Approach 2:
The dilation characteristics are controlled by changing the length parameters of the adjustment cords. By varying the cord lengths, the device can continuously adjust the dilation amount and profile, enabling convenient testing under different dilation conditions without complex mechanical adjustments
Data Source
AI summary
A dilation device is provided for modeling mitral regurgitation in a mitral valve that includes an annular housing surrounding an aperture; a first anterior blade mounted to the housing and defining a substantially straight inner edge adjacent the aperture; and a plurality of posterior blades mounted to the housing and defining a curved inner edge adjacent the aperture, the posterior blades movable to dilate a valve mounted to the blades. An annulus of a valve may be sutured to the blades such that valve is disposed adjacent the aperture, and the dilation device may be actuated to cause the posterior blades to dilate a posterior region of the valve.