Adjustable Shunt Valve Assembly for Stable Ventricular Pressure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing shunt systems for managing cerebral spinal fluid (CSF) in conditions like hydrocephalus struggle to maintain a selected pressure within the ventricles, leading to inappropriate fluid volume and pressure changes in the brain.
Innovation Solution
A catheter system with an integrated flow regulating valve assembly that includes a cassette assembly and a flow limiting mechanism to maintain a selected pressure within the ventricles by controlling the opening pressure of the valve based on inlet pressure, using a spring-biased mechanism and adjustable rotor positions to set the opening threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a shunt system is implanted to drain CSF from the ventricle, then fluid volume and pressure in the brain can be reduced, but the system struggles to maintain a selected pressure within the ventricles, leading to inappropriate fluid volume and pressure changes
Solution Approach 1:
The valve assembly incorporates a dynamically adjustable mechanism that allows the opening pressure to be modified after implantation. The adjustment member can be repositioned to change the compression force on the biasing member, enabling the valve to adapt to changing patient needs and maintain appropriate ventricular pressure over time.
Solution Approach 2:
The system enables parameter changes by allowing adjustment of the valve's opening pressure threshold. By modifying the compression force applied to the biasing member through the adjustment member, the pressure at which the valve opens can be changed, thereby controlling CSF drainage to maintain selected ventricular pressure.
2Reliability
If the valve opening pressure is set to maintain selected ventricular pressure, then appropriate CSF volume can be maintained, but the system requires complex adjustment mechanisms to achieve and maintain the selected pressure threshold
Solution Approach 1:
The valve assembly is segmented into distinct functional components: a valve body, a biasing member (spring), and an adjustment member. This segmentation allows each component to perform its specific function while enabling easy adjustment of the opening pressure by simply repositioning the adjustment member without affecting other parts of the system.
Solution Approach 2:
The complex adjustment mechanism is replaced with a simple mechanical system using a biasing member (spring) and an adjustment member that can be repositioned to change compression force. This mechanical approach provides reliable pressure regulation without requiring complex electronic or hydraulic control systems.
3Measurement precision
If the valve assembly includes adjustable rotor positions to set the opening threshold, then the opening pressure can be precisely controlled, but the device requires more complex assembly and adjustment procedures
Solution Approach 1:
The adjustment member is pre-configured with specific positions that correspond to predetermined opening pressure thresholds. During implantation or adjustment, the operator simply needs to position the adjustment member at the desired pre-determined location, eliminating the need for complex calculations or precise manual adjustments during the procedure.
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 system effectively regulates CSF flow to maintain a desired pressure and volume within the ventricles, preventing excessive drainage and ensuring stable intracranial pressure conditions.
Implementation Method 1
a biasing member to apply a closing force to the sealing member
Implementation Method 2
When the inlet pressure to the valve assembly exceeds the closing force, a valve mechanism within the cassette assembly opens to allow flow of the material, such as the fluid, through a passage
Data Source
AI summary
A system includes a flow regulating system. The flow regulating system may assist in ensuring a selected pressure within an inlet volume. A flow regulator may be included in a shunt assembly (10).