MRI-Compatible Defibrillator Enclosure for EMI Reduction
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Solution Overview
Problem
Current external defibrillation and pacing systems are hindered by the strong electromagnetic interference (EMI) and electromagnetic forces (EMF) generated by MRI scanners, limiting the performance of interventional cardiovascular MRI procedures that require cardiac monitoring and rapid patient transport between MRI and X-ray rooms.
Innovation Solution
The MAGNA-DEX system adapts commercially available external defibrillators for safe operation in MRI environments by using a nonmagnetic enclosure, magnetic-field sensors, a frontend interface panel with mode-switching capabilities, and system-control and signal-conditioning features to minimize EMI impact on MR image quality, enabling EMI-free, defibrillation, and custom operational modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an external defibrillator is used in the MRI environment, then cardiac defibrillation and pacing functions are provided, but electromagnetic interference degrades MR image quality and system reliability
Solution Approach 1:
The patent introduces an MRI-compatible monitoring system as an intermediary device that receives physiological signals through MRI-compatible cables and processors. This intermediary system handles the EMI-prone signal acquisition and processing outside the MRI bore, while only the essential defibrillator components remain in the MRI environment, thereby isolating the sensitive monitoring functions from the strongest EMI sources.
Solution Approach 2:
The patent extracts the signal processing and monitoring functions from the defibrillator unit itself, placing them in a separate MRI-compatible monitoring system. This separation removes the sensitive electronic components that generate and are susceptible to EMI from the immediate MRI environment, while maintaining the defibrillation capability where it is needed.
2Reliability
If the defibrillator remains stationary near the MRI scanner, then continuous monitoring is maintained, but patient mobility is restricted
Solution Approach 1:
The patent implements a dynamic system where the defibrillator can be rapidly repositioned between the MRI scanner and transport areas. The system is designed with mobile mounting capabilities and wireless or flexible cable connections that allow the device to move with the patient during transport while maintaining monitoring and defibrillation readiness. This dynamic positioning capability enables both continuous monitoring during procedures and rapid mobility during patient transport.
3Reliability
If the defibrillator is adapted for MRI compatibility, then safe operation in MRI environment is achieved, but device complexity increases
Solution Approach 1:
The patent creates a universal system where a single adapted defibrillator unit can operate in both MRI and non-MRI environments. The MRI-compatible monitoring system serves multiple functions: it monitors physiological signals during MRI procedures, processes EMI-filtered signals, and can function independently as a complete monitoring system. This multi-functionality reduces the need for separate specialized equipment for different environments.
Solution Approach 2:
The patent divides the defibrillation system into distinct modular components: the core defibrillator unit, the MRI-compatible monitoring system, and the connection interface. This segmentation allows each component to be optimized independently for its specific function and environment, reducing overall system complexity while maintaining MRI compatibility and defibrillation capability.
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 safe and effective cardiac defibrillation and pacing during MRI procedures by reducing EMI interference, allowing for high-quality MR imaging and real-time physiological monitoring, while ensuring patient safety and mobility.
Implementation Method 1
A magnetic-field sensor, for example, a sensor based on the Hall effect, with an associated indicator of high (e.g., >200 Gauss) magnetic-field strength
Implementation Method 2
An enclosure, which is adapted for housing an external defibrillator and which may further include a mounting tool (clamp and/or holder) that secures MAGNA-DEX in place (despite the attraction force generated by the MRI magnet)
Implementation Method 3
the cables transmitting physiological monitoring signals, e.g., ECG, blood pressure, pulse oximetry, directly from an individual (with or without filtering electromagnetic interference and/or other types of noise)
Data Source
AI summary
This accessory adapts external cardiac defibrillation systems to enable safe defibrillation, pacing, and cardioversion inside the MRI bore with minimal effect on MR image quality. Commercially available external defibrillators are not designed to work in the MRI environment. An MR-compatible defibrillator is needed to safely perform cardiovascular MRI, in particular MR-guided interventional cardiovascular procedures, such as cardiac electrophysiology studies and cardiac catheterization. This accessory includes nonmagnetic defibrillator housing with MRI safety features, provides interface for MRI-compatible physiological monitoring, and optimizes defibrillator operation for the MRI environment. The accessory may include MRI-compatible modules for monitoring/recording electrocardiogram, blood pressure, pulse oximetry, and other physiological signals. It may also include a wireless transmitter and at least one module for electrical energy generation and/or stimulation.