Torsion Spring Fixation for Transcatheter Valve Anchoring
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Solution Overview
Problem
Current minimally invasive cardiac valve replacement methods face challenges with proper placement and migration of stented valves, leading to potential malfunction and the need for additional surgeries.
Innovation Solution
A prosthetic heart valve design featuring an expandable stent with a torsion spring for radial expansion and anchoring, combined with support arms to limit expansion, ensuring proper placement and reducing migration within the body lumen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a stented valve is used for minimally invasive cardiac valve replacement, then the procedure can be performed percutaneously with reduced surgical risk, but the valve may migrate or be misplaced due to insufficient radial strength and anchoring capability
Solution Approach 1:
The stent is designed as a self-expanding dynamic structure that transitions from a compressed delivery state to an expanded deployed state. The stent's radial strength and anchoring capability are activated dynamically upon deployment, allowing the valve to secure itself in the correct position within the body lumen after percutaneous insertion.
Solution Approach 2:
The stent is divided into multiple segments or struts that can independently expand and conform to the body lumen geometry. This segmentation allows the stent to achieve proper radial expansion and anchoring while maintaining flexibility during delivery through the catheter.
2Strength
If the stent is made more rigid to prevent migration, then anchoring strength is improved, but the device becomes harder to deliver via catheter and may cause vessel damage
Solution Approach 1:
The stent exhibits dynamic mechanical properties, being flexible during delivery and rigid during deployment. This is achieved through the stent's structural design that allows compression to a small profile for catheter passage, then self-expands to provide sufficient radial strength for anchoring without requiring complex delivery mechanisms.
Solution Approach 2:
The stent's physical parameters (diameter, radial strength, stiffness) are changed from a compressed state during delivery to an expanded state during deployment. This parameter transformation allows the stent to navigate through narrow vessels and then provide strong anchoring force once deployed.
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 solution enables precise placement and secure anchoring of the prosthetic valve, minimizing migration and ensuring effective heart function without the need for additional surgeries.
Implementation Method 1
a spring attached to the first end of the expandable stent; wherein the expandable stent and the spring can expand radially to a desired diametric configuration in order to anchor the prosthetic valve at an implantation position in a body lumen
Implementation Method 2
the expandable stent and the spring can expand radially to a desired diametric configuration
Data Source
AI summary
Described is a prosthetic valve, comprising: an expandable stent including an inner lumen and having a first and a second end; and a spring attached to the first end of the expandable stent; wherein the expandable stent and the spring can expand radially to a desired diametric configuration in order to anchor the prosthetic valve at an implantation position in a body lumen. Related systems and methods.