Shape-Memory Anchor Hook for Side-Delivered Heart Valves
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Solution Overview
Problem
Traditional transcatheter prosthetic valves face challenges in delivering and deploying prosthetic heart valves through the patient's vasculature due to limitations in expanded diameter, which is constrained by the internal diameter of the delivery catheter.
Innovation Solution
An anchor hook system for transcatheter heart valve replacement, featuring an elongated shaft with a hook portion, anchoring tabs, and a tether, made from shape memory material, allowing for expansion and compression to facilitate delivery and secure anchoring within the heart valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional valves are compressed into a small diameter for delivery, then delivery catheter size can be minimized, but the expanded diameter of the valve is limited by the internal diameter of the delivery catheter
Solution Approach 1:
The valve is divided into multiple expandable segments or cells that can be compressed into a compact configuration for delivery and then expanded independently to achieve the required functional diameter. This segmentation allows the valve to transition from a small compressed state to a larger expanded state without being constrained by the delivery catheter diameter.
Solution Approach 2:
The valve design utilizes dimensional transformation by compressing the valve structure into a compact form factor for delivery, then expanding it radially to achieve the functional diameter. This dimensional change from compressed to expanded state resolves the contradiction between small delivery size and large functional size.
2Area of moving object
If the expanded diameter of the valve is increased to improve valve function, then valve performance is improved, but the delivery catheter internal diameter must be larger which complicates delivery
Solution Approach 1:
The valve is divided into multiple expandable segments or cells that can be compressed into a compact configuration for delivery and then expanded independently to achieve the required functional diameter. This segmentation allows the valve to transition from a small compressed state to a larger expanded state without being constrained by the delivery catheter diameter.
Solution Approach 2:
The valve employs dynamic structural transformation with movable or expandable elements that can change configuration from a compressed delivery state to an expanded functional state. This dynamic capability allows the valve to adapt its size according to the delivery requirements versus functional requirements.
3Reliability
If anchoring features are added to the valve, then valve stability and anchoring capability are improved, but the compressed size of the valve increases making delivery more difficult
Solution Approach 1:
The anchoring features are nested within or integrated with the existing valve structure in a compact configuration, allowing them to be contained within the small compressed valve profile for easy delivery. The anchoring elements are positioned to engage with the valve body or surrounding tissue after deployment, providing stability without increasing the compressed delivery size.
Solution Approach 2:
The valve is divided into multiple expandable segments or cells that can be compressed into a compact configuration for delivery and then expanded independently to achieve the required functional diameter. This segmentation allows the valve to transition from a small compressed state to a larger expanded state without being constrained by the delivery catheter diameter.
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 anchor hook system enables secure anchoring of transcatheter heart valves while maintaining a relatively small compressed size, allowing for effective delivery and deployment without limiting the expanded diameter of the valve.
Implementation Method 1
the anchor hook made from shape memory material and the anchor hook heat-set into an open or expanded configuration where the hook portion extends away from a central axis of the shaft portion
Data Source
AI summary
The invention relates to an anchor hook and methods of using the same for subannular anchoring of a transcatheter heart valve replacement, and in particular for an orthogonally delivered (side-delivered) transcatheter prosthetic heart valve having a annular support frame having compressible wire cells that facilitate rolling and folding the valve length-wise, or orthogonally to the central axis of the flow control component, allowing a very large diameter valve to be delivered and deployed to the mitral or tricuspid valve from the inferior vena cava or superior vena cava, or trans-septally to the mitral valve, the valve having a height of about 5-60 mm and a diameter of about 25-80 mm, without requiring an oversized diameter catheter and without requiring a delivery catheter to bend 90 degrees during deployment.