In-line RF Filter Modules for MRI Neurological Electrodes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current neurological monitoring systems face challenges during MRI procedures due to RF heating issues, leading to potential burns, as existing filters like tank filters are frequency-specific, costly, and labor-intensive to tune, necessitating the removal and re-attachment of electrodes, which is time-consuming and costly.
Innovation Solution
Incorporating in-line filter modules with series-connected inductors and resistors in the electrode system's cable to reduce RF heating, minimizing frequency specificity and eliminating the need for precise tuning, thus allowing continuous monitoring during MRI procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If tank filters are used in electrode cables to block RF energy, then RF heating is reduced, but the filters are frequency-specific, costly, and labor-intensive to tune
Solution Approach 1:
The patent extracts the frequency-selective tuning requirement from the filter design by using a broad-band approach. Instead of tuning tank filters to specific frequencies, the invention uses simple resistive heating elements that provide continuous broadband RF attenuation, eliminating the need for frequency-specific tuning while maintaining effective RF heating reduction across all MRI frequencies.
Solution Approach 2:
The patent replaces expensive, complex, and maintenance-intensive tank filters with simple, inexpensive resistive heating elements. These passive resistive elements require no tuning, adjustment, or maintenance, providing permanent broadband RF attenuation without the cost and complexity of traditional tank filter systems.
2Object-affected harmful factors
If electrodes are removed and re-attached for MRI procedures, then RF heating risk is minimized, but the process is time-consuming and expensive
Solution Approach 1:
The patent applies preliminary protective action by incorporating RF attenuation elements directly into the electrode cable before the MRI procedure begins. This pre-installed protection allows electrodes to remain attached throughout the procedure without risk of burn injury, eliminating the need for removal and re-attachment while maintaining safety.
Solution Approach 2:
The patent introduces an intermediary protective element (resistive heating element) between the RF field and the electrode-skin interface. This intermediary component absorbs and dissipates RF energy as heat before it can cause burn injuries, enabling continuous electrode attachment during MRI procedures without safety concerns.
3Measurement precision
If stronger magnetic fields and higher radio frequency are used, then image quality is improved, but resistance heating and potential for burns increase
Solution Approach 1:
The patent converts the harmful RF energy into beneficial heat dissipation through resistive heating elements. Instead of allowing RF energy to cause uncontrolled heating and burn injuries at the electrode-skin interface, the resistive elements deliberately convert RF energy into controlled heat that dissipates safely, enabling higher MRI frequencies without increased burn risk.
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 in-line filter modules effectively reduce RF energy delivery to the skin, minimizing the risk of burns and enabling safer, more efficient neurological monitoring during MRI procedures without the need for frequent electrode attachment and detachment.
Implementation Method 1
one or more inline filter modules configured in series along the cable, the one or more inline filter modules including one or more inductors configured in a series
Implementation Method 2
The RF energy in the cable heats the cable and any electrically resistive material connected to it. If the cable is connected to an electrode attached to the skin of the patient, resistance heating at the skin-electrode interface may result in a burn injury.
Data Source
AI summary
Disclosed are aspects of an electrode system and method that include an electrode, a connector, and a cable with one or more inline frequency filter modules comprising one or more inductors wired in series, and without any added capacitance. The one or more inline filter modules are placed along the cable and provide filtering of RF energy, thus minimizing the accumulation of heat at the electrode to patient connection. Further, in some aspects, the one or more inline filter modules are located at one or more specific locations along the cable, chosen through computer modeling and real-world testing, for minimum transfer of received RF energy to a patient's skin from the electrode.