Implantable Medical Device Telemetry Power Management
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Solution Overview
Problem
Implantable medical devices face significant power depletion during long-term monitoring sessions, especially during MRI procedures, due to the high power demands of continuous RF telemetry, which can lead to battery drain and potential damage.
Innovation Solution
An implantable medical device with a telemetry module that switches between low power and default RF communication protocols, using a low power protocol during long-term monitoring by selecting parts of electrophysiological and hemodynamical signal waveforms for transmission at predetermined intervals and powering down the transmitter between intervals, reducing current drain and extending battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous RF telemetry is used for long-term monitoring during MRI procedures, then patient and device monitoring capability is improved, but battery power is depleted rapidly
Solution Approach 1:
The patent implements periodic transmission of electrophysiological data during MRI procedures instead of continuous transmission. The device transmits data at predetermined intervals (e.g., every few seconds) while maintaining monitoring capability, thereby significantly reducing power consumption during the procedure while still providing essential cardiac monitoring functionality.
2Reliability
If high power RF communication is used for distance telemetry, then communication range and reliability are improved, but battery lifetime is reduced
Solution Approach 1:
The patent dynamically adjusts the telemetry communication protocol based on operational context. During MRI procedures or long-term monitoring when power conservation is critical, the system switches to low-power periodic transmission modes. During normal operation when power availability is sufficient, full-performance RF communication is used, thus optimizing the balance between communication reliability and battery lifetime.
3Loss of information
If continuous data transmission is performed during MRI procedures, then complete monitoring information is provided to external systems, but current drain increases and may damage the battery
Solution Approach 1:
The patent extracts and transmits only the most critical electrophysiological data parameters during MRI procedures rather than continuous full-resolution data streams. By selecting and transmitting only essential monitoring information (such as key cardiac rhythm events and critical parameters) at reduced intervals, the system maintains adequate monitoring capability while dramatically reducing current drain to safe levels that prevent battery damage.
Data Source
AI summary
The present invention is directed to an implantable medical device and a method for power management for power efficient use of RF telemetry during, for example, conditions where long periods of continuous monitoring of the device and the patient is desired such as during MRI procedures. A protocol module adapted to, at receipt of a low power protocol indication, activate and use a low power protocol for communication between the device and external units. The protocol module is capable of switching between different communication protocols including a low power communication protocol and a default RF communication protocol depending on, for example, whether continuous long-term monitoring of the patient is performed. During the low power communication protocol, the protocol module is adapted to select parts of stored electrophysical and/or hemodynamical signal waveforms for telemetric transmission and to create communication packages having a predetermined length using the selected parts of the electrophysiological and/or hemodynamical signal waveform. Further, a transmitter is instructed to transmit the communication packages at predetermined transmission intervals and the telemetry module is instructed to power down the transmitter or set the transmitter in a lowest possible activation state during intermediate periods between the transmission intervals.