Implantable Medical Device Communication Switching for MRI Reliability
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Solution Overview
Problem
Implantable medical devices (IMDs) face challenges in maintaining reliable communication, particularly during MRI procedures, where conductive communication is disrupted by noise, leading to system instability and reduced longevity due to reliance on less efficient RF communication.
Innovation Solution
The implementation of a method that allows IMDs to switch between conductive and RF communication based on trigger events, using conductive communication by default for energy efficiency and switching to RF communication during MRI exposure to maintain synchronization and extend device longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conductive communication is used for implant-to-implant communication between IMDs, then energy efficiency is improved and device longevity is extended, but communication reliability deteriorates when exposed to MRI system noise
Solution Approach 1:
The system dynamically switches between conductive communication and RF communication modes based on detected trigger events (such as MRI exposure detection). The communication method is made adjustable and adaptive, transitioning from static conductive-only communication to a dynamic system that selects the appropriate communication pathway based on environmental conditions, thereby resolving the contradiction between energy efficiency and reliability.
Solution Approach 2:
The system changes the communication parameter (communication mode) in response to detected trigger events. When MRI noise is detected, the system transitions from conductive communication to RF communication, effectively changing the operational parameters to maintain reliability while accepting increased energy consumption only when necessary.
2Reliability
If RF communication is used for implant-to-implant communication between IMDs, then communication reliability is maintained during MRI procedures, but energy consumption increases and device longevity decreases
Solution Approach 1:
The system employs periodic monitoring for trigger events (such as MRI exposure detection) and switches communication modes only during specific periods when needed. Instead of continuously using RF communication, the system periodically checks for MRI conditions and activates RF communication only during those specific time periods, thereby maintaining reliability when necessary while minimizing overall energy consumption.
Solution Approach 2:
The system applies RF communication partially - only when and where needed (during MRI procedures), rather than continuously. This partial application of RF communication maintains reliability during critical periods while avoiding excessive energy consumption during normal operation, effectively resolving the contradiction between reliability and energy use.
3Object-affected harmful factors
If IMDs switch to MRI safe-mode in response to noise trigger, then protection from MRI noise is achieved, but system functionality is reduced and communication between IMDs is lost
Solution Approach 1:
The system segments the response to MRI exposure into different functional layers: the pacemaker function switches to a protected safe-mode, while the communication function switches to an alternative pathway (RF communication). This segmentation allows the system to protect critical pacemaker functions from MRI noise while maintaining communication functionality through a different, noise-resistant channel, thereby preserving overall system versatility.
Solution Approach 2:
RF communication acts as an intermediary pathway that enables IMD communication during MRI procedures without requiring the pacemaker to exit its protected safe-mode. The intermediary communication channel allows the system to maintain both protection from MRI noise and communication functionality simultaneously, resolving the contradiction between protection and adaptability.
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 continuous and efficient communication between IMDs, even during MRI scans, while minimizing the energy inefficiencies associated with exclusive RF communication, thereby prolonging device lifespan and ensuring reliable patient care.
Implementation Method 1
Conductive communication involves transmitting and receiving communication signals through patient tissue, typically using the same electrodes that are used for cardiac pacing and sensing
Implementation Method 2
RF communication, by contrast, involves using an antenna for transmitting and receiving RF communication signals
Data Source
AI summary
Certain embodiments described herein related to methods, devices, and systems that provide improved communications between first and second IMDs remotely located relative to one another and capable of communicating using both conductive communication and RF communication. Such a method can include the first IMD using conductive communication to transmit message(s) intended for the second IMD, without using RF communication, during a first period of time that a first trigger event is not detected. The method can also include the first IMD detecting the first trigger event, and in response thereto, the first IMD using RF communication to transmit message(s) intended for the second IMD during a second period of time. Thereafter, in response to first IMD detecting a second trigger event, the first IMD uses conductive communication to transmit one or more messages intended for the second IMD, without using RF communication, during a third period of time.