Implant-to-Implant Conductive Communication Mode Switching Under Interference
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Solution Overview
Problem
Conductive implant-to-implant communication in multi-chamber leadless pacemaker systems is susceptible to disruptions due to extrinsic interference, leading to potential synchronization issues and inefficient power consumption.
Innovation Solution
Implement a controller in the IMDs to manage conductive communication modes, including a first mode for regular communication and a second mode with reduced power consumption, and utilize a beacon message system to detect interference, transitioning between modes based on invalid message thresholds and successful beacon message reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conductive i2i communication is used for implant-to-implant communication, then energy efficiency is improved, but communication reliability deteriorates due to extrinsic interference
Solution Approach 1:
The system dynamically switches between two communication modes: a first conductive communication mode for normal operation and a second RF communication mode for interference mitigation. The controller monitors communication quality and transitions modes based on detected interference levels, allowing the system to adapt to changing environmental conditions while maintaining both energy efficiency and communication reliability
Solution Approach 2:
The patent introduces an intermediary mechanism (mode switching system) that mediates between conductive communication and RF communication. This intermediary allows the system to use the energy-efficient conductive mode as primary while having the capability to switch to RF mode when interference is detected, thus resolving the contradiction between energy efficiency and reliability
2Reliability
If conductive communication messages are transmitted frequently, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The system implements periodic communication at optimized intervals rather than continuous transmission. In the first conductive communication mode, messages are transmitted at regular intervals sufficient to maintain synchronization and detect interference, while avoiding excessive transmission that would waste energy. The second RF communication mode uses similar periodic principles when activated
Solution Approach 2:
The system changes communication parameters (transmission frequency, power level, mode) based on operational conditions. When in the first conductive mode, parameters are optimized for energy efficiency with lower transmission frequency. When interference is detected and the system switches to the second RF mode, parameters are adjusted to prioritize reliability over energy consumption
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
Enhances communication reliability and reduces power consumption by minimizing false-positive errors and maintaining synchronization while conserving battery life.
Implementation Method 1
Conductive communication involves transmitting and receiving communication signals through patient tissue
Data Source
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AI summary
While in a first conductive i2i communication mode, during a cardiac cycle, an IMD transmits an outgoing conductive i2i communication message to another IMD, and attempts to receive a valid incoming conductive i2i communication message from the other IMD. In response to the IMD detecting that a quantity of invalid messages received during a cardiac cycle reaches an invalid message count threshold, which is indicative of noise adversely affecting the conductive i2i communication, the IMD switches from the first conductive i2i communication mode to a second conductive i2i communication mode that consumes on average less power per cardiac cycle. The IMD remains in the second conductive i2i communication mode for up to M cardiac cycles before switching back to the first mode, or switches back earlier if the IMD determines using one or more conductive i2i beacon messages that noise that caused the initial switch is likely no longer present.