Prosthetic Valve Cannula for Controlled Retrograde Flow
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Solution Overview
Problem
Current prosthetic valves do not allow for a controlled amount of retrograde flow, which is beneficial for preventing thrombus formation and extending the effective lifetime of natural valves, unlike their natural counterparts.
Innovation Solution
The development of medical devices with a valve member and cannula that permit fluid flow in one direction while preventing flow in the opposite direction, with the cannula allowing a controlled amount of retrograde flow when the valve is closed, mimicking the 'leakiness' of natural valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If prosthetic valves are designed to completely prevent retrograde flow, then valve sealing performance is improved, but thrombus formation increases and valve longevity decreases
Solution Approach 1:
The valve structure incorporates different functional zones: the main valve leaflets provide complete sealing for forward flow, while the cannulae provide localized controlled retrograde flow paths. This local quality differentiation allows the valve to achieve both excellent sealing performance and thrombus prevention by permitting limited reverse flow through specific channels.
Solution Approach 2:
The cannulae act as intermediary structures that mediate between the conflicting requirements of complete sealing and thrombus prevention. These small-diameter channels (0.5-2mm) provide a controlled intermediate flow path that allows limited retrograde flow to prevent blood stasis and thrombus formation while maintaining overall valve sealing effectiveness.
2Object-affected harmful factors
If natural valves are allowed to be slightly leaky, then thrombus formation is reduced, but forward flow efficiency decreases
Solution Approach 1:
The valve is segmented into multiple functional components: main valve leaflets for forward flow control and separate cannulae for retrograde flow control. This segmentation allows independent optimization of each function - the leaflets maximize forward flow efficiency while the cannulae provide controlled retrograde flow to prevent thrombus, avoiding the trade-off present in natural valves.
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
Enables a controlled amount of retrograde flow, reducing thrombus formation and potentially increasing the longevity of prosthetic valves by allowing a limited reverse flow, similar to natural valves.
Implementation Method 1
The at least one cannula permits a controlled amount of fluid flow through the device in the second, opposite direction
Data Source
AI summary
Prosthetic valves for regulating fluid flow through a body vessel are described. The valves include a valve member that includes at least a portion that is capable of moving to selectively permit and substantially prevent fluid flow through the body vessel, either alone or with one or more additional valve members. A cannula is associated with the valve and permits a controlled amount of fluid flow through the valve, such as retrograde flow while the valve member substantially prevents fluid flow through the body vessel.