Electromagnetic Flow Meter for Shunt Catheter Monitoring
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Solution Overview
Problem
Current devices for monitoring the flow rate of cerebrospinal fluid (CSF) in ventriculoperitoneal shunts for hydrocephalus treatment lack non-invasive and accurate methods, often requiring invasive procedures and providing inaccurate results, leading to delayed detection of shunt blockages or malfunctions.
Innovation Solution
An electromagnetic flow meter using a Halbach Cylinder magnet array to measure CSF flow rate, generating a velocity-dependent voltage through magnetic induction, with wirelessly transmitted data to allow continuous monitoring and non-invasive feedback on shunt functionality, compatible with existing shunt systems and capable of detecting changes in fluid conductivity indicative of infections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If invasive procedures are used to monitor shunt flow rate, then measurement capability is provided, but patient risk and procedural complexity increase
Solution Approach 1:
The patent replaces invasive mechanical measurement methods with an electromagnetic flow meter that uses magnetic fields and electrical signals to measure CSF flow rate non-invasively. The electromagnetic flow meter generates a magnetic field through a magnet array and detects voltage changes induced by moving CSF, eliminating the need for invasive procedures while maintaining measurement capability.
Solution Approach 2:
The patent introduces an electromagnetic field as an intermediary between the measurement system and the CSF. The magnetic field penetrates tissue non-invasively to interact with the conductive CSF, allowing flow measurement without direct physical contact or intrusion into the body.
2Reliability
If continuous monitoring is implemented, then timely detection of shunt malfunction is achieved, but device complexity and power requirements increase
Solution Approach 1:
The electromagnetic flow meter is designed to be self-powered through the kinetic energy of the flowing CSF itself. The movement of conductive CSF through the magnetic field generates electrical energy that powers the sensor and wireless transmission components, enabling continuous monitoring without external power sources or complex battery systems.
Solution Approach 2:
The device combines multiple functions into a single integrated system: the magnet array generates the magnetic field for flow measurement, the electrodes detect the induced voltage, and the same system provides wireless data transmission. This multi-functionality reduces overall system complexity while enabling continuous monitoring.
3Ease of operation
If electromagnetic flow meter is integrated into existing shunt system, then non-invasive monitoring is achieved, but compatibility and integration challenges arise
Solution Approach 1:
The electromagnetic flow meter is designed as a modular component that can be integrated into existing shunt systems at specific locations. The magnet array and electrode assembly are segmented into discrete elements that can be attached to or incorporated within the shunt catheter, allowing compatibility with various shunt configurations without requiring complete system redesign.
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 and continuous monitoring of CSF flow rates, reducing the need for invasive procedures, providing timely interventions, and allowing for adjustments to flow rates without surgery, thereby improving patient outcomes and reducing complications.
Implementation Method 1
the magnetic field used within the device is generated by a Halbach Cylinder, a type of permanent magnet array wherein a velocity-dependent voltage is created via magnetic induction
Implementation Method 2
the flow of the conductive fluid through the electromagnetic field generates an induced voltage; wherein a measured induced voltage is proportional to a conductive fluid velocity
Data Source
AI summary
A ventricular shunt device, such as a ventriculoperitoneal (“VP”) shunt, comprising an electromagnetic flow meter attachment, in aspects attachable to pre-existing peritoneal catheters systems, providing for the capability for physicians to obtain information about the status of the VP shunt and its functionality. Due to the high failure rate of current shunt catheters and the associated dangers with shunt failure, the need for real-time monitoring is ever present. A Halbach cylinder or other electromagnetic system or array is implemented to generate a magnetic field to observe flow rates through the peritoneal catheter to serve certain functions, as well as associated applications and verification of the device in computational and experimental settings.