Implantable Device Safety Core for MRI Interference
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Solution Overview
Problem
Implantable medical devices (IMDs) face risks during MRI procedures due to magnetic and RF fields, which can cause interference, heating, and faulty operations, necessitating a failsafe mechanism to ensure patient safety.
Innovation Solution
An implantable device with a separate safety core that can assume control from the primary controller, featuring a normal operating mode and an MRI-specific mode, which adjusts functionality to prevent interference and ensure safe operation during MRI scans.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the implantable device operates with full functionality during MRI procedures, then the device can provide complete diagnostic and therapeutic capabilities, but the device may experience interference, heating, and faulty operations from magnetic and RF fields
Solution Approach 1:
The device is segmented into two independent control systems: a primary controller for normal operation and a safety core for MRI operation. Each controller manages specific functions appropriate to its operating environment, allowing the device to maintain reliability during MRI while preserving adaptability through the primary controller's full functionality.
Solution Approach 2:
The device dynamically transitions between two operating modes controlled by different controllers. During MRI procedures, the safety core assumes control and disables sensitive functions; during normal operation, the primary controller provides full functionality. This dynamic switching resolves the contradiction by adapting the operational state to environmental conditions.
2Object-affected harmful factors
If the device disables sensitive functions during MRI procedures, then the device ensures patient safety by preventing interference and heating, but the device loses diagnostic and therapeutic capabilities
Solution Approach 1:
The control functions are segmented between the primary controller (which maintains therapy delivery capability) and the safety core (which prevents harmful effects during MRI). The safety core specifically manages functions sensitive to MRI fields while the primary controller preserves therapeutic capabilities for when MRI is not performed.
Solution Approach 2:
The device performs preliminary actions by pre-configuring the safety core with instructions for MRI operation. Before MRI procedures begin, the system prepares the safety core to take control and disable sensitive functions, preventing harmful effects before they occur while preserving the ability to restore full functionality after MRI.
3Reliability
If the device uses a separate safety core circuit independent from the primary controller, then the device achieves fail-safe operation during faults or errors, but the device complexity increases
Solution Approach 1:
The control architecture is segmented into independent safety core and primary controller circuits. This segmentation provides fail-safe operation during faults while managing complexity through clear separation of responsibilities: the safety core handles critical safety functions independently, while the primary controller manages normal operation.
Solution Approach 2:
The safety core and primary controller are merged into a single integrated device with coordinated operation. They share common resources such as power supply, memory, and communication interfaces, which reduces overall complexity compared to completely separate systems while maintaining independent fault tolerance capabilities.
Data Source
AI summary
An implantable device, such as a pacer, defibrillator, or other cardiac rhythm management device, can include a failsafe backup, such as a separate and independent safety core that can assume control over operation of the implantable device from a primary controller. In an example, the safety core can include a normal first safety core operating mode and a magnetic resonance imaging (MRI) second safety core operating mode that can provide different functionality from the normal first safety core operating mode.