Valve Prosthesis Gradual Release for Accurate Deployment Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Transcatheter heart valve prostheses face challenges with inaccurate positioning due to jumping and oscillation during deployment, leading to issues like conduction disturbances, coronary artery obstruction, and undesirable paravalvular leakage.
Innovation Solution
A valve prosthesis with a self-expanding frame and a paddle-stem configuration that allows for a partially deployed configuration before full release, reducing potential and kinetic energy to enhance positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the heart valve prosthesis is released from the catheter in a self-expanding configuration, then the valve prosthesis achieves full expansion and functionality, but jumping and oscillation occur causing the valve prosthesis to move from the desired position
Solution Approach 1:
The release mechanism is segmented into multiple stages: first the distal end is released and expanded, then the proximal end is released and expanded. This segmentation allows controlled deployment that minimizes jumping and oscillation while achieving full expansion.
Solution Approach 2:
The distal end of the valve prosthesis is released and expanded before the proximal end. This preliminary action allows the distal portion to stabilize first, providing a foundation that reduces oscillation during subsequent proximal end deployment.
2Manufacturing precision
If the valve prosthesis is fully expanded immediately upon release, then full valve functionality is achieved, but positioning accuracy deteriorates due to jumping and oscillation
Solution Approach 1:
The deployment process is divided into distinct segments with different levels of expansion. The distal end reaches full expansion while the proximal end remains partially constrained, creating a controlled progressive deployment that improves positioning precision.
Solution Approach 2:
The valve prosthesis transitions through dynamic states from fully constrained to partially expanded at the distal end, and finally to fully expanded. This dynamic progressive deployment allows precise control over the expansion process while maintaining operational simplicity through the delivery catheter mechanism.
3Length of moving object
If the heart valve prosthesis is delivered in a radially compressed configuration, then delivery through catheters is enabled, but the prosthesis requires significant expansion force upon deployment causing oscillation
Solution Approach 1:
The expansion force is segmented and applied progressively rather than simultaneously. The distal end expands first with its required force, then the proximal end expands with its force. This segmentation reduces peak forces and associated oscillation compared to simultaneous full expansion.
Solution Approach 2:
The distal end undergoes preliminary expansion before the proximal end expansion begins. This preliminary action reduces the total expansion force required at any single moment and distributes the force application over time, minimizing oscillation while enabling delivery in a compressed state.
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 partially deployed configuration minimizes oscillation and shifting, ensuring accurate placement of the valve prosthesis by reducing kinetic energy and potential energy, thereby improving implant stability.
Implementation Method 1
In the collapsed configuration the plurality of endcrowns store potential energy, and the stored potential energy is reduced by at least 40 percent when the self-expanding frame expands from the collapsed configuration to the partially deployed configuration
Data Source
AI summary
A valve prosthesis includes a self-expanding frame and a prosthetic valve coupled to an interior of the frame. The frame includes a plurality of endcrowns at a first end thereof, and a first paddle connected to a first endcrown by a first stem. The first end of the frame is collapsible to a collapsed configuration when a restraining force is applied to the first paddle and to the endcrowns, is configured to expand from the collapsed configuration to a partially deployed configuration when the restraining force is removed from the endcrowns but is still applied to the first paddle, and is configured to expand to a fully deployed configuration when the restraining force is removed from the endcrowns and from the first paddle. A first vale of a lateral dimension of the first end in the partially deployed configuration is at least 70 percent of a second value of the lateral dimension of the first end in the fully deployed configuration.