MRI-Compatible Electrophysiology Interface for RF Attenuation
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Solution Overview
Problem
Conventional imaging techniques used in electrophysiology laboratory (EP lab) systems, such as fluoroscopy and MRI, face challenges with radiation exposure, limited detail in tissue characterization, and interference from MRI's electromagnetic components, which affect the performance of medical devices and signal processing.
Innovation Solution
An MRI-compatible electrophysiology laboratory system with a medical device featuring high- and low-impedance electrical pathways and an interface module that attenuates MRI's RF and gradient field pulses, ensuring signal integrity and device compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If MRI is used for imaging in EP lab system, then radiation-free volumetric imaging with good tissue characterization is achieved, but electromagnetic interference from MRI components affects electrical signal transmission and device functionality
Solution Approach 1:
The patent introduces an interface module as an intermediary component between the MRI system and the electrophysiology laboratory system. This interface module contains electromagnetic shielding and filtering mechanisms that block or attenuate the electromagnetic interference from MRI's RF pulses and gradient fields, thereby protecting the electrical signal transmission in the EP lab system while allowing the MRI imaging function to operate
Solution Approach 2:
The patent modifies the electrical parameters of the EP lab system components to be compatible with the MRI electromagnetic environment. This includes adjusting impedance matching, filtering frequency ranges, and modifying signal amplification characteristics to operate effectively in the presence of MRI's electromagnetic fields, thus maintaining signal reliability while enabling MRI imaging
2Reliability
If conventional imaging techniques are used in EP lab system, then electrical signal transmission is maintained, but radiation exposure and limited tissue characterization detail occur
Solution Approach 1:
The patent creates an integrated system that combines both conventional electrophysiology imaging capabilities and MRI imaging capabilities into a single unified platform. The system can selectively operate in conventional mode for electrical signal monitoring or switch to MRI mode for radiation-free volumetric imaging with superior tissue characterization, providing multi-functional versatility without requiring separate systems
3Object-affected harmful factors
If MRI-compatible components are integrated into EP lab system, then radiation-free imaging with detailed tissue characterization is achieved, but device complexity increases due to additional shielding and filtering requirements
Solution Approach 1:
The patent merges the MRI imaging system and the electrophysiology laboratory system into a single integrated platform where shared components (such as the patient table, control room, and data processing systems) are common to both subsystems. The interface module combines electromagnetic shielding, filtering, and signal processing functions in a unified design, reducing the overall space and complexity compared to having completely separate systems
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 enables effective diagnostic and therapeutic functions within an MRI environment by minimizing interference and ensuring the safety and functionality of medical devices, providing detailed tissue characterization and visualization.
Implementation Method 1
The electrical pathway is configured to attenuate magnetic resonance radio frequency and gradient field pulses generated by the MRI system
Implementation Method 2
MRI involves magnetic resonance gradient field pulses that are used to encode spatial location in nuclear resonant frequencies. These pulses may induce signal artifacts that resemble cardiac electrograms and interfere with electrical signals transmitted or communicated in the EP lab system
Data Source
AI summary
An electrophysiological laboratory system comprises a subsystem configured to perform diagnostic and/or therapeutic functions, a medical device, and an interface module disposed therebetween. The medical device comprises a shaft having proximal and distal portions, high- and low-impedance electrical pathways disposed within the shaft, and an electrode disposed at the distal portion of the shaft and electrically coupled to one or both of the high- and low-impedance electrical pathways. The electrode is configured to perform diagnostic and/or therapy delivery functions. The interface module comprises a high-impedance channel configured to couple the high-impedance pathway of the medical device to the subsystem, and to attenuate magnetic resonance RF and gradient field pulses generated by the MRI system. The interface module further comprises a low-impedance channel configured to couple the low-impedance pathway of the medical device to the subsystem.