IMD Telemetry Mode Switching During MRI Scans
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Solution Overview
Problem
Implantable medical devices (IMDs) face disruptions during medical procedures like MRI scans due to external energy fields, which can interfere with their operation and wireless telemetry, necessitating a solution to enable partial functionality and communication during such procedures.
Innovation Solution
The implementation of an MRI-compatible operating mode in IMDs that allows for selective enablement of wireless telemetry and notification of patient events, enabling communication and partial functionality while disabling certain therapies during MRI scans, using a processor to detect events and switch between operational modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If wireless telemetry is enabled during MRI scan, then patient event notification is improved, but MRI scan quality deteriorates due to induced noise
Solution Approach 1:
The patent implements dynamic switching of telemetry functionality based on MRI scan detection. The IMD processor detects MRI scanner presence and dynamically adjusts telemetry operation: disabling it during active scanning to prevent noise, and enabling it during idle periods or after scanning to allow patient event notification. This dynamic adaptation resolves the contradiction between maintaining MRI quality and enabling communication.
2Object-affected harmful factors
If IMD operation is disabled during MRI scan, then MRI scan quality is improved, but patient safety deteriorates due to inability to detect or respond to patient events
Solution Approach 1:
The patent segments IMD functionality into distinct operational modes: sensing functions remain fully operational to detect patient events, while telemetry transmission is selectively disabled only during active MRI scanning. This segmentation allows the device to maintain patient safety through continuous monitoring while preventing MRI interference through controlled telemetry operation. The processor manages these segmented functions independently based on real-time MRI scanner detection.
3Reliability
If full IMD functionality is maintained during MRI scan, then patient safety is improved, but MRI scan quality deteriorates due to telemetry interference
Solution Approach 1:
The patent introduces an intermediary control mechanism - the processor - that mediates between sensing functions and telemetry transmission based on MRI scanner detection. The processor acts as an intelligent intermediary that permits sensing operations to continue for patient safety while blocking or scheduling telemetry transmissions to avoid MRI interference. This intermediary control enables selective functionality management that resolves the contradiction between maintaining safety and preventing interference.
Data Source
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AI summary
An implantable medical device may include a telemetry module, a sensing module, a therapy delivery module, and a processor. The processor may be configured to detect a patient event based on data generated by the sensing module, operate the IMD in a first mode in which the telemetry module is disabled and the therapy delivery module is at least partially disabled when the patient event is not detected, and operate the IMD in a second mode in which the telemetry module is enabled and the therapy delivery module is at least partially disabled when the patient event is detected. In some examples, the processor is configured to, in the second mode, generate a notification of the cardiac arrhythmia and transmit the notification to an external device via the telemetry module. The external device may reside inside an MRI room or outside the MRI room, and may communicate with other devices.