IMD MRI Presence Detection via Acceleration and Induction
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Solution Overview
Problem
Implantable medical devices (IMDs) are not compatible with magnetic resonance imaging (MRI) systems, leading to issues such as power supply problems, false event sensing, and heating due to strong electromagnetic fields, and there is a need for a method to identify the presence or absence of an MRI system to mitigate these effects.
Innovation Solution
The use of implantable sensors, such as acceleration sensors and MRI-sensitive conductive elements, to detect patterns indicative of the presence or absence of an MRI system, allowing the IMD to switch to an MRI mode of operation or remain in a normal mode based on the identified state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If implantable medical devices are used in patients, then patient monitoring and treatment capabilities are improved, but the devices become incompatible with MRI systems due to electromagnetic field interference
Solution Approach 1:
The IMD proactively detects the approach of an MRI system using acceleration sensors and conducts preliminary assessments (device compatibility checks, battery status evaluations, lead integrity tests) before the MRI procedure begins. This preliminary action allows the device to prepare protective measures in advance, switching to MRI-safe operational modes and preventing harmful electromagnetic interference before it can affect device functionality.
Solution Approach 2:
The system continuously monitors environmental conditions (acceleration patterns, electromagnetic fields) and device status (battery voltage, lead impedance) during the MRI procedure. Based on this real-time feedback, the IMD dynamically adjusts its operational parameters, modifies stimulation thresholds, and communicates with the MRI team to maintain safe and effective operation throughout the procedure.
2Object-affected harmful factors
If the IMD switches to MRI mode of operation, then protection against electromagnetic field effects is improved, but device functionality and normal operation are reduced
Solution Approach 1:
The IMD employs dynamic operational modes that can be adjusted in real-time. Rather than a fixed MRI mode that permanently limits functionality, the device transitions between normal and MRI-protected modes based on the detected presence and proximity of the MRI system. This dynamic approach ensures full functionality during normal operation while providing targeted protection only when needed during MRI procedures.
Solution Approach 2:
The system modifies specific operational parameters (stimulation amplitude, pulse width, sensing thresholds) when entering MRI mode rather than disabling entire device functions. This selective parameter adjustment maintains essential monitoring and limited therapeutic capabilities while protecting against electromagnetic interference, allowing the device to remain partially functional even during MRI procedures.
3Measurement precision
If additional sensors are added to detect MRI presence, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The IMD utilizes existing multi-functional sensors already present in the device for other monitoring purposes. Acceleration sensors used for detecting patient movement and activity are also employed to detect the characteristic acceleration patterns of an approaching MRI system. This multi-functional use of existing sensors improves MRI detection capability without adding dedicated hardware, thereby avoiding increased device complexity.
Solution Approach 2:
The device uses its own existing sensor suite and processing capabilities to detect and assess MRI presence, eliminating the need for external detection systems or additional specialized sensors. The IMD's built-in processors analyze sensor data from multiple sources (acceleration, electromagnetic field sensing, temperature) to independently determine MRI proximity and initiate appropriate protective measures.
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 solution effectively mitigates the adverse effects of MRI fields on IMDs by enabling them to adjust their operation accordingly, ensuring safe and reliable functioning during MRI procedures.
Implementation Method 1
sensing first data via at least one implantable sensor of an implantable medical device (IMD) system and identifying a presence-absence state of a magnetic resonance imaging (MRI) system using the first data
Implementation Method 2
sensing first data via at least one implantable sensor of an implantable medical device (IMD) system and identifying a presence-absence state of a magnetic resonance imaging (MRI) system using the first data
Data Source
AI summary
A system and/or method involving sensing first data via at least one implantable sensor of an implantable medical device (IMD) system, and identifying a presence-absence state of a magnetic resonance imaging (MRI) system using the first data.