Adjustable Hydrocephalus Valve Threshold Pressure Control
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Solution Overview
Problem
Current hydrocephalus treatment valves lack the ability to adjust the threshold pressure in small, precise increments, hindering the transition to shunt independence where the patient's own circulation system can manage cerebrospinal fluid flow.
Innovation Solution
A valve with an adjustable mechanism that allows fluid flow only when the pressure exceeds a threshold, adjustable up to 400 mm H2O in increments of 10-40 mm H2O, using a biasing member and cam mechanism to incrementally increase the threshold pressure, enabling gradual transition to patient-dependent cerebrospinal fluid circulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current valve mechanisms are used, then fluid flow can be regulated at a threshold pressure, but the threshold pressure cannot be adjusted in small increments to achieve shunt independence
Solution Approach 1:
The adjustment mechanism is divided into multiple discrete positions (e.g., 21 positions) that correspond to specific threshold pressure increments. This segmentation allows precise control of the threshold pressure in small steps, enabling gradual increase from initial values (e.g., 30-200 mm H2O) to final values (e.g., 200-500 mm H2O) to achieve shunt independence.
Solution Approach 2:
The valve mechanism transitions from a fixed threshold pressure design to a dynamic, adjustable design where the threshold pressure can be modified over time. The adjustment mechanism allows the threshold to be changed in response to patient development, enabling the system to adapt from high dependency on shunt flow to gradual independence.
2Adaptability or versatility
If the threshold pressure is increased to achieve shunt independence, then the patient's circulation system can manage CSF flow, but current valves lack the precision to do so gradually
Solution Approach 1:
The adjustment mechanism divides the pressure range into discrete, manageable increments corresponding to specific positions. This allows the threshold pressure to be increased gradually in controlled steps rather than in large, uncontrolled jumps, enabling the patient's circulation system to adapt progressively.
Solution Approach 2:
The valve utilizes changes in physical parameters (threshold pressure, flow rate) to achieve the desired effect. By systematically varying the threshold pressure parameter through the adjustment mechanism, the system enables gradual transition to shunt independence while maintaining precise control over the change rate.
3Ease of operation
If a valve mechanism allows adjustment of opening pressure, then fluid flow can be controlled, but existing mechanisms cannot provide sufficient adjustment range and precision for pediatric patients
Solution Approach 1:
The adjustment mechanism is segmented into multiple discrete positions (e.g., 21 positions) that provide both ease of operation through simple position selection and measurement precision through controlled pressure increments. Each position corresponds to a specific threshold pressure value, making adjustment straightforward while maintaining precision.
Solution Approach 2:
The valve mechanism is designed to be universally applicable across different patient ages and conditions while providing precise adjustment capability. The same mechanism can accommodate a wide range of threshold pressures (from 30-200 mm H2O initially to 200-500 mm H2O finally) and different increment sizes (10-40 mm H2O), making it suitable for various clinical scenarios.
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 gradual increase in threshold pressure to achieve shunt independence, allowing the shunt to be removed as the patient's own system takes over cerebrospinal fluid circulation, effectively treating hydrocephalus.
Implementation Method 1
a biasing member coupled to an adjustment mechanism and effective to bias the restricting element against the aperture at the threshold pressure
Implementation Method 2
the adjustment mechanism can be, for example, a cam mechanism having a plurality of positions formed thereon with each position corresponding to a predetermined threshold pressure
Data Source
AI summary
A valve for use in a shunt system to drain fluid from one part of a patient's body to another is provided. In an exemplary embodiment, the valve is operable at a threshold pressure that is selectively adjustable up to at least about 400 mm H2O at increments in the range of about 10 mm H2O to 40 mm H2O. The ability of the valve to operate at a high threshold pressure and to be adjusted at relatively small increments renders the valve particularly advantageous for use in younger hydrocephalus patients. In particular, the operating pressure of the valve can be gradually limited in small increments over a period of time to slowly force the patient's own resorption system to circulate cerebrospinal fluid. At high operating pressures of at least about 400 mm H2O shunt independence can be achieved thereby allowing the shunt to be successfully removed.