Radially Expandable Prosthetic Device Over-Expansion Mechanism
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Solution Overview
Problem
Current prosthetic heart valves lack the ability to be over-expanded, making it difficult to accommodate additional devices or maintain a seal with growing native anatomy, as they are limited by their initial expansion mechanism.
Innovation Solution
A radially expandable and compressible frame with a threaded rod actuator that allows for additional expansion beyond its initial state when an external force exceeds a predetermined threshold, utilizing an over-expansion structure that enables relative sliding movement between the screw actuator and the frame, allowing for further expansion without actuator rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a prosthetic heart valve is designed with a fixed expansion mechanism, then it provides reliable initial deployment, but it cannot be over-expanded to accommodate additional devices or maintain seal with growing anatomy
Solution Approach 1:
The frame transitions from a static locked state to a dynamic over-expansion state. The over-expansion structure includes movable components that allow the frame to expand beyond its initial configured state when subjected to external force, enabling adaptability while maintaining structural integrity through controlled mechanical movement.
Solution Approach 2:
The frame's radial dimension parameter can be changed beyond the initial expansion state. The over-expansion mechanism allows the frame to achieve a second expanded state with a larger radial dimension than the first configured state, enabling the valve to accommodate growth or additional devices through parameter modification.
2Adaptability or versatility
If a prosthetic heart valve uses a threaded rod actuator for expansion, then it allows controlled expansion to a configured state, but it prevents further expansion beyond that state
Solution Approach 1:
The over-expansion structure is pre-configured to counteract the locking action of the threaded rod actuator. When external force is applied, the over-expansion mechanism engages to allow further expansion despite the actuator's designed restraint, effectively preparing the structure in advance to handle expansion beyond the normal configured state.
Solution Approach 2:
The over-expansion structure acts as an intermediary between the threaded rod actuator and the frame. It mediates the transition from the actuator-controlled expansion to the over-expansion state, allowing the actuator to maintain its simple operation while enabling additional expansion capability through the intermediate over-expansion mechanism.
3Adaptability or versatility
If the frame structure is made rigid to maintain seal, then it provides reliable sealing, but it cannot accommodate native anatomy growth
Solution Approach 1:
The frame incorporates dynamic elements that allow it to transition between a rigid sealed state and an expanded state. The over-expansion structure enables the frame to grow with the native anatomy when needed while maintaining sealing reliability through its ability to return to or maintain the configured sealed state when not in over-expansion mode.
Data Source
AI summary
A prosthetic device, such as a prosthetic heart valve, can include a radially compressible and expandable frame and a screw actuator that is coupled to the frame and configured to be rotated to radially expand the frame from a radially compressed state to a first radially expanded state. The frame includes an over-expansion structure that is configured to allow relative sliding movement between the screw actuator and the frame in a longitudinal direction to permit the frame to radially expand from the first radially expanded state to a second radially expanded state when an external expansion force applied to the prosthetic heart valve exceeds a predetermined force.