Dual-Sensor MRI Exposure Verification for Implantable Devices
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Solution Overview
Problem
Implantable medical devices face challenges in reliably determining whether they are exposed to an MRI or a non-MRI procedure, leading to inconsistent configuration of exposure modes and post-procedure diagnostics due to the reliance on detecting magnetic fields from manual magnets.
Innovation Solution
The implantable medical device is equipped with a first sensor for detecting magnetic fields and a second sensor for identifying MRI-specific characteristics, allowing it to differentiate between MRI and non-MRI procedures and automatically adjust the exposure mode and post-procedure diagnostics accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the implantable medical device uses a single magnetic field sensor to detect both MRI and non-MRI procedures, then the device can automatically enter exposure mode for either procedure type, but the device cannot reliably determine which specific procedure type is occurring leading to incorrect configuration
Solution Approach 1:
The detection function is segmented into two separate sensors: a first sensor for detecting magnetic fields to trigger exposure mode, and a second sensor for detecting MRI-specific characteristics to identify the procedure type. This segmentation allows the device to reliably distinguish between MRI and non-MRI procedures while maintaining automatic exposure mode entry.
Solution Approach 2:
The second sensor acts as an intermediary that detects MRI-specific characteristics (such as RF pulses or gradient fields) to provide additional information about the procedure type. This intermediary detection mechanism resolves the ambiguity that would otherwise prevent reliable determination of whether an MRI or non-MRI procedure is occurring.
2Adaptability or versatility
If the implantable medical device manually programs exposure mode and post-exposure diagnostics, then the configuration can be customized for each procedure type, but the process requires medical personnel intervention and is prone to human error
Solution Approach 1:
The device uses feedback from the second sensor detecting MRI-specific characteristics to automatically determine the procedure type and select the appropriate configuration. This feedback mechanism enables the device to adaptively configure exposure mode and post-exposure diagnostics based on the detected procedure type, eliminating manual programming while maintaining customized settings for MRI and non-MRI procedures.
Solution Approach 2:
The implantable medical device performs self-configuration by automatically detecting the procedure type through the second sensor and selecting the appropriate exposure mode and post-exposure diagnostic settings. This self-service capability eliminates the need for medical personnel to manually program the device while ensuring the correct configuration is applied for each procedure type.
3Device complexity
If the implantable medical device uses only magnetic field detection for procedure identification, then the device structure remains simple, but the device cannot distinguish between MRI and non-MRI procedures
Solution Approach 1:
The detection system is segmented into two sensors with distinct functions: the first sensor detects magnetic fields to trigger exposure mode, while the second sensor detects MRI-specific characteristics to identify the procedure type. This segmentation increases measurement precision for procedure type identification while keeping each individual sensor relatively simple.
Solution Approach 2:
The device achieves multi-functionality in detection by using two sensors that together provide both magnetic field detection and MRI-specific characteristic detection. This universal detection capability allows the device to identify both MRI and non-MRI procedures accurately, improving measurement precision without requiring overly complex individual sensor designs.
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
This approach ensures accurate and automated entry and exit from exposure modes, reducing human error and the need for manual intervention, while ensuring appropriate therapy delivery and diagnostics post-exposure.
Implementation Method 1
a first sensor for detecting a magnetic field
Implementation Method 2
a second sensor that detects an MRI characteristic
Data Source
AI summary
Implantable medical devices include a first sensor for detecting a magnetic field that indicates an exposure mode of operation is appropriate. The implantable medical devices include a second sensor for detecting whether an MRI characteristic is present that indicates whether MRI or non-MRI post exposure diagnostics and other actions should be implemented and may also indicate whether the exposure mode should be MRI or non-MRI specific. An MRI post exposure diagnostic may perform pacing capture threshold tests and the post exposure pacing amplitude output may be kept at a higher than normal level. The second sensor may be an overvoltage clamp circuit of a telemetry coil that indicates whether an overvoltage condition on the telemetry coil is occurring to indicate whether an MRI characteristic is present. The second sensor may be a second threshold magnetic sensor, an accelerometer, or a microphone to indicate whether an MRI characteristic is present.