Implantable Medical Device Automatic Mode Switching for MRI Safety
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Solution Overview
Problem
Implantable medical devices (IMDs) face improper operation and thermal damage when exposed to disruptive energy fields, such as those from MRI scanners, due to induced energy on leads being misinterpreted as physiological signals or causing tissue heating.
Innovation Solution
The IMD automatically switches from an exposure operating mode to a normal operating mode after a threshold time has elapsed since configuration and when the disruptive energy field is no longer detected, ensuring safe reconfiguration without manual programming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the IMD operates in normal mode during exposure to disruptive energy fields, then the device maintains full functionality, but the device experiences improper operation and thermal damage
Solution Approach 1:
The IMD changes its operating parameters by switching between normal mode and exposure mode. In exposure mode, the device modifies its sensing and therapy delivery parameters to prevent misinterpretation of induced energy as physiological signals, thereby avoiding improper operation and thermal damage while maintaining reliability during disruptive energy field exposure
2Productivity
If the IMD automatically switches from exposure mode to normal mode, then the device restores full functionality, but the device may switch too early before the disruptive energy field exposure is complete
Solution Approach 1:
The IMD uses feedback from its disruptive energy field detector to control the timing of mode transitions. The device continuously monitors for the presence of disruptive energy fields and only switches from exposure mode to normal mode when the detector confirms the disruptive field is no longer present, ensuring safe operation while restoring functionality
Solution Approach 2:
The IMD performs preliminary detection of disruptive energy fields before switching modes. By detecting the presence or absence of disruptive fields in advance, the device can proactively switch between exposure and normal modes at appropriate times, preventing both premature switching and unnecessary exposure to harmful conditions
3Object-affected harmful factors
If the IMD remains in exposure mode after the disruptive energy field is gone, then the device maintains safety, but the device loses full functionality
Solution Approach 1:
The IMD uses feedback from its disruptive energy field detector to automatically transition from exposure mode to normal mode when the disruptive field is no longer detected. This feedback mechanism ensures the device maintains protection during exposure while restoring full functionality when safe to do so
4Ease of operation
If manual programming is required to switch modes, then the device operates with precise control, but the device requires user intervention and cannot automatically adapt
Solution Approach 1:
The IMD performs self-service by automatically detecting disruptive energy fields and switching between exposure and normal modes without user intervention. The device uses its built-in disruptive energy field detector and control circuitry to autonomously adapt to changing environmental conditions, eliminating the need for manual programming while maintaining precise control through automated feedback-based decision making
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 prevents unnecessary therapy delivery or withholding, reduces thermal damage, and stabilizes the device and patient physiology after exposure to disruptive energy fields, ensuring reliable operation.
Implementation Method 1
monitoring for presence of the disruptive energy field
Implementation Method 2
The disruptive energy field may induce energy on one or more of the implantable leads coupled to the IMD
Implementation Method 3
the induced energy on the leads may result in stimulation or heating of the tissue and/or nerve site adjacent to the electrodes of the leads
Data Source
AI summary
Techniques may automatically disable an exposure mode that was enabled for operation in the presence of a disruptive energy field. For example, an implantable medical device (IMD) automatically disables the exposure operating mode when (i) the amount of time that has elapsed since enabling the IMD exceeds a threshold amount of time and (ii) a disruptive energy field is detected before the amount of time exceeds the threshold amount of time and the disruptive energy field is not currently detected. When either of these conditions is not met, the IMD continues to operate in accordance with the exposure operating mode.