Adjustable CSF Shunt Valve Using Cam-Controlled Flow Resistance
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Solution Overview
Problem
Current shunt and valve systems for managing cerebral spinal fluid (CSF) accumulation around the brain lack a reliable mechanism to adjust resistance and control fluid flow effectively, which can lead to inadequate alleviation of CSF accumulation and associated negative impacts.
Innovation Solution
A valve assembly with a moveable rotor and cam surfaces that adjust the pressure applied to a valve member, allowing for selective control of fluid flow by rotating the rotor to engage different cam surfaces, thereby altering the force required to open the valve and regulate flow from a source to a collection volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a valve system is installed to drain CSF from the brain, then CSF accumulation is alleviated, but the system lacks reliable adjustment mechanism for resistance control
Solution Approach 1:
The patent replaces traditional mechanical screw-adjustment mechanisms with a magnetic field-based adjustment system. A magnet positioned outside the skull interacts with a ferromagnetic material attached to the valve component, allowing non-invasive adjustment of valve resistance. This substitution eliminates the need for surgical reopening while providing reliable and precise control over CSF drainage resistance.
2Reliability
If the valve resistance is increased to control fluid flow, then drainage effectiveness is improved, but the force required to open the valve increases
Solution Approach 1:
The patent employs cam surfaces with varying radii to change the mechanical parameters of valve operation. As the cam surface radius varies during rotation, it modulates the force transmission to the valve member, allowing the valve to maintain high resistance during closed positions while requiring reduced force to transition to the open position. This parameter variation enables controlled drainage effectiveness without excessive opening force.
3Measurement precision
If a moveable member with cam surfaces is used to adjust valve pressure, then flow control precision is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into the cam surface component. The cam surface simultaneously serves as the adjustment mechanism for varying resistance, the mechanical linkage for force transmission, and the positioning element for controlling valve member movement. By combining these functions into a single integrated component rather than separate mechanisms, the patent achieves precise flow control while minimizing the increase in overall device complexity.
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 precise adjustment of fluid flow resistance, ensuring effective drainage of CSF and potential applications in various flow control systems beyond hydrocephalus, such as pressure relief and fluid management in mechanical or commercial systems.
Implementation Method 1
The adjustment may occur via a cam surface on the first member. The moveable member may be substantially round and include one or more cam surfaces formed on an exterior edge of the moveable member. Each cam surface may extend or have an external surface that is at a selected distance from a center of the moveable member.
Data Source
AI summary
Disclosed is a valve assembly operable to selectively control a flow or passage of a fluid. The valve assembly may be applied to any appropriate mechanism such as a hydrocephalus shunt, fluid draining sewage system, or tank holding system. The valve assembly disclosed may include a selected profile for various applications.