Dual Variable Shunt Valve for Hydrocephalus CSF Flow Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional shunt valves for hydrocephalus treatment struggle to regulate cerebrospinal fluid flow rates finely while maintaining intraventricular pressure at normal levels, leading to issues like over-drainage and sudden drops in pressure, especially in patients who change positions.
Innovation Solution
A shunt valve system with two tandem variable shunt valves, each with a pressure-regulating mechanism using a ball and spring system and a rotating rotor to adjust the flow rate based on intraventricular pressure, allowing for precise control of cerebrospinal fluid flow and preventing sudden pressure changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single shunt valve is used to regulate cerebrospinal fluid flow, then the device structure is simple, but the flow rate regulation precision is insufficient and intraventricular pressure cannot be maintained stably
Solution Approach 1:
The shunt valve system is divided into two independent variable pressure valves connected in series. Each valve can independently regulate flow rate and intraventricular pressure, allowing precise control without requiring a single complex valve mechanism.
Solution Approach 2:
The second variable pressure valve is positioned downstream of the first valve in the fluid flow path, creating a nested arrangement where both valves work together in sequence to achieve cumulative flow regulation and pressure stabilization effects.
2Productivity
If the shunt valve opens widely to drain excess cerebrospinal fluid, then the flow rate increases, but the intraventricular pressure drops drastically causing over-drainage
Solution Approach 1:
Each variable pressure valve contains a pressure-sensitive mechanism that continuously monitors intraventricular pressure and automatically adjusts the valve opening degree. When pressure rises, the valve opens to drain fluid; when pressure drops, the valve closes to prevent over-drainage, creating a self-regulating feedback system.
Solution Approach 2:
The valves change their flow resistance parameter dynamically based on intraventricular pressure conditions. The pressure-sensitive mechanism adjusts the effective opening area of the valves, transforming the system from static flow control to dynamic parameter adaptation that maintains pressure stability.
3Speed
If the shunt valve responds rapidly to pressure changes, then the flow rate adjusts quickly, but the intraventricular pressure fluctuates suddenly especially when patients change positions
Solution Approach 1:
The system provides cushioning against sudden pressure changes through the dual-valve configuration. The downstream valve acts as a buffer that moderates rapid pressure fluctuations, preventing drastic intraventricular pressure changes while still allowing responsive drainage when needed.
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 regulation of cerebrospinal fluid flow rates without drastic changes in intraventricular pressure, reducing symptoms associated with hydrocephalus and improving patient outcomes by maintaining stable pressure and flow rates.
Implementation Method 1
a first valve pressure variable device for regulating an increase and decrease of a flow rate of cerebrospinal fluid flowing in through the ventricular catheter, via the inflow connector and a first on-off valve by regulating the first on-off valve, specifically, by changing a degree of aperture of the first on-off valve in accordance with changes in intraventricular pressure
Implementation Method 2
a rotating rotor to adjust the flow rate based on intraventricular pressure, allowing for precise control of cerebrospinal fluid flow
Data Source
AI summary
[Problem]Disclosed is a shunt valve for treatment of hydrocephalus such that the flow rate of cerebrospinal fluid drained from the brain ventricles can be freely regulated without drastically changing the intraventricular pressure when the pressure thereof becomes abnormal after a transplant.[Means to Solve the Problem]A shunt valve for treatment of hydrocephalus which regulates the drainage amount of cerebrospinal fluid from the ventricles, and comprises a cured plastic substrate for stabilizing in a prescribed position, an inflow connector formed in a cylindrical shape to which a rear end of a ventricular catheter is connected, a first valve pressure variable device which regulates an increase and decrease in the flow rate of the cerebrospinal fluid with a first on-off valve according to changes in the intraventricular pressure and is capable of changing the opening and closing pressure into a plurality of levels, a second valve pressure variable device which regulates the increase and decrease of the flow rate of the cerebrospinal fluid with a second on-off valve according to changes in the fluid pressure of the cerebrospinal fluid drained from an outflow channel of the first valve pressure variable device and is capable of changing the opening and closing pressure into a plurality of levels, and an outflow connector formed in a cylindrical shape to which a rear end of a peritoneal catheter is connected.