Flexible-Member Shunt Valve for Constant Cerebrospinal Fluid Flow
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Solution Overview
Problem
Current flow regulating valves for managing hydrocephalus do not provide a constant fluid flow rate, which is essential for effective management of cerebrospinal fluid diversion.
Innovation Solution
A valve assembly with a flexible flow control member that adjusts to maintain a constant outlet flow rate by flexing inward in response to pressure changes, ensuring consistent fluid flow through the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current valves are used to manage cerebrospinal fluid diversion, then the valve can provide flow rate control, but the outlet flow rate is not constant and varies with pressure changes
Solution Approach 1:
The patent employs a flexible flow control member that dynamically adjusts its configuration in response to pressure changes. The member transitions between expanded and collapsed states based on the differential between inner chamber pressure and outer chamber pressure, automatically maintaining constant flow rate without requiring complex external control systems
Solution Approach 2:
The valve assembly uses the pressure differential itself as the control mechanism. The flexible flow control member self-regulates by expanding when inner pressure exceeds outer pressure and collapsing when outer pressure exceeds inner pressure, eliminating the need for external actuators or complex control circuits
2Reliability
If pressure differentials are reduced to prevent over-drainage, then fluid flow control improves, but fluid accumulation may occur reducing management effectiveness
Solution Approach 1:
The flexible flow control member acts as a passive feedback mechanism that continuously responds to pressure differential changes. When pressure differential increases, the member expands to restrict flow; when pressure differential decreases, the member collapses to increase flow, automatically maintaining optimal fluid diversion without external intervention
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 valve assembly maintains a constant fluid flow rate regardless of pressure variations, preventing over-drainage and reducing the risk of infection by minimizing fluid accumulation and pressure differentials.
Implementation Method 1
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 (10) configured to maintain fluid flow therethrough at a constant flow rate. The valve assembly (10) including a flexible flow control member (50) defining an inner fluid chamber (90) within the flexible flow control member (50) and an inlet opening (56) to the inner fluid chamber (90). An outer fluid chamber (92) is defined between the flexible flow control member (50) and an inner surface (74) of a valve housing (20). The flexible flow control member (50) is configured to flex inward and shrink the inner fluid chamber (90) in response to a pressure decrease in the inner fluid chamber (90) relative to the outer fluid chamber (92) resulting from an increase in an inlet flow rate to maintain an outlet flow rate from the valve assembly (10) at the constant flow rate.