Flexible Shunt Valve Assembly for Constant CSF Flow Control
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Solution Overview
Problem
Current flow regulating valves for managing hydrocephalus do not provide a consistent fluid flow rate, leading to inefficiencies and potential complications.
Innovation Solution
A valve assembly with a flexible flow control member that adjusts to maintain a constant outlet flow rate by flexing in response to pressure changes, utilizing an inner and outer fluid chamber configuration and a check valve to regulate fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional valve is used to divert cerebrospinal fluid, then fluid flow can be managed, but the outlet flow rate varies and is not constant
Solution Approach 1:
The valve assembly employs a flexible flow control member that dynamically adjusts the inner fluid chamber volume in response to pressure changes. This dynamic adjustment mechanism allows the valve to automatically regulate flow rate variations, transforming a static valve structure into an adaptive system that maintains constant outlet flow despite fluctuations in inlet flow rate or downstream pressure
Solution Approach 2:
The invention changes the physical parameter of the inner fluid chamber volume through the flexible flow control member's deformation. By varying the chamber volume in response to pressure differentials, the system modulates the flow characteristics to compensate for inlet flow rate changes, thereby achieving constant outlet flow rate through parameter transformation
2Productivity
If the inlet flow rate increases, then more fluid enters the valve, but the outlet flow rate increases and becomes inconsistent
Solution Approach 1:
The valve assembly implements a feedback mechanism where the flexible flow control member senses pressure changes within the inner fluid chamber that result from inlet flow rate variations. This pressure feedback causes the flexible member to deform, adjusting the chamber volume to counteract flow rate changes and maintain consistent outlet flow, thereby closing the control loop
3Speed
If pressure decreases in the inner fluid chamber, then flow rate through the valve increases, but this creates siphoning effects
Solution Approach 1:
The check valve provides preliminary anti-action by preventing backward flow into the inlet passageway before siphoning effects can develop. Additionally, the flexible flow control member anticipates pressure decreases by adjusting the inner fluid chamber volume to maintain pressure equilibrium, counteracting the conditions that would lead to harmful siphoning effects
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
Ensures a consistent fluid flow rate regardless of pressure variations, minimizing siphoning effects and reducing the risk of fluid accumulation and infection.
Implementation Method 1
The flexible flow control member is configured to flex inward and shrink the inner fluid chamber in response to a pressure decrease in the inner fluid chamber relative to the outer fluid chamber
Implementation Method 2
The flexible flow control member is configured to flex inward and shrink the inner fluid chamber
Implementation Method 3
A check valve is at an upstream end of the housing and is configured to allow flow of the fluid from the inlet connector into the outer fluid chamber and restrict flow of the fluid from the outer fluid chamber back into the inlet connector
Data Source
AI summary
A valve assembly configured to maintain fluid flow therethrough at a constant flow rate. The valve assembly including a flexible flow control member defining an inner fluid chamber within the flexible flow control member and an inlet opening to the inner fluid chamber. An outer fluid chamber is defined between the flexible flow control member and an inner surface of a valve housing. The flexible flow control member is configured to flex inward and shrink the inner fluid chamber in response to a pressure decrease in the inner fluid chamber relative to the outer fluid chamber resulting from an increase in an inlet flow rate to maintain an outlet flow rate from the valve assembly at the constant flow rate.