Electromagnetic Flow Meter for CSF Shunt 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 unreliable results, leading to delayed detection of shunt malfunctions.
Innovation Solution
An electromagnetic flow meter using a Halbach Cylinder magnet array to generate a magnetic field perpendicular to the CSF flow, creating a velocity-dependent voltage, which is then conditioned for wireless transmission to a remote device, allowing continuous monitoring of CSF flow rates and potential shunt malfunctions without invasive methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If invasive procedures are used to monitor CSF flow rate, then measurement reliability is improved, but patient harm and procedural complexity increase
Solution Approach 1:
The patent replaces invasive mechanical measurement procedures with a non-invasive electromagnetic field-based measurement system. The electromagnetic flow meter uses magnetic fields and electrical signals to measure CSF flow rate through the catheter without physical contact or intrusion into the fluid pathway, thereby eliminating the need for invasive procedures while maintaining measurement reliability.
Solution Approach 2:
The patent introduces an electromagnetic field as an intermediary medium to measure CSF flow rate. The magnetic field generated by the Halbach array and the induced voltage serve as intermediaries that allow measurement of fluid flow without direct mechanical interaction, enabling non-invasive monitoring while preserving measurement accuracy.
2Measurement precision
If invasive procedures are used to monitor CSF flow rate, then measurement precision is improved, but device complexity and procedural difficulty increase
Solution Approach 1:
The patent substitutes complex invasive mechanical measurement devices with a simpler electromagnetic flow meter that uses magnetic fields and voltage measurements. The electromagnetic system requires no mechanical intrusion into the catheter or fluid pathway, reducing device complexity while maintaining or improving measurement precision through non-contact sensing.
Solution Approach 2:
The electromagnetic field serves as a simple intermediary that enables precise measurement without complex mechanical structures. The magnetic field generated by the Halbach array and the induced voltage provide a straightforward measurement mechanism that avoids the complexity of invasive mechanical sensors or probes.
3Object-affected harmful factors
If non-invasive methods are used to monitor CSF flow rate, then patient harm is reduced, but measurement reliability deteriorates
Solution Approach 1:
The patent achieves reliable measurement without patient harm by substituting mechanical invasive procedures with electromagnetic field-based measurement. The electromagnetic flow meter measures CSF flow rate through the catheter wall using magnetic fields and induced voltages, providing accurate data without any physical intrusion or risk to the patient.
Solution Approach 2:
The electromagnetic field acts as a harmless intermediary that enables reliable measurement of CSF flow rate. The magnetic field penetrates the catheter wall and induces voltage proportional to fluid velocity, providing accurate measurement information without any harmful interaction with the patient or the fluid.
4Loss of time
If continuous monitoring is implemented, then early detection of malfunctions is improved, but energy consumption increases
Solution Approach 1:
The patent implements continuous monitoring through periodic measurement cycles where the electromagnetic flow meter continuously generates magnetic fields, measures induced voltages, and transmits data. This periodic operation enables real-time detection of flow changes and shunt malfunctions while managing energy consumption through efficient measurement intervals and wireless transmission only when needed.
Solution Approach 2:
The system implements continuous feedback monitoring where the electromagnetic flow meter continuously measures CSF flow rate and transmits data to external devices. This feedback mechanism enables early detection of flow reductions or blockages, allowing timely clinical intervention while the system manages energy consumption through efficient signal processing and selective transmission.
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 non-invasive, continuous monitoring of CSF flow rates, enabling early detection of shunt blockages or malfunctions, reducing the need for invasive procedures and improving patient care by providing proactive interventions.
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
Data Source
AI summary
An implantable flow meter device for measuring flow rate of a body fluid through a tube, such as a catheter and/or a ventriculoperitoneal (“VP”) shunt, comprising a flow meter attachment, in aspects attachable to pre-existing tubes, VP shunts, catheters, and/or peritoneal catheters systems, providing for the capability for physicians to obtain information about the status of the flow rate of the body fluid through the tube. The flow meter can include temperature sensors measuring the body fluid at a first and second position, as well as a heating element applying heat to the body fluid therebetween. A controller can receive the first temperature, the second temperature, and a heat value relating to the heat applied to the body fluid by the heating element, such that a processing device can calculate a flow rate of the body fluid based thereon.