Conductive Implant 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 inefficiencies and power consumption issues.
Innovation Solution
Implement a controller in the implantable medical device (IMD) to manage conductive communication modes, including a first mode for regular communication and a second mode with reduced power consumption, and utilize i2i Noise Reversion with checking to mitigate interference by sending and receiving beacon messages to determine if extrinsic noise has subsided.
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 and device longevity is increased, but communication reliability deteriorates due to susceptibility to extrinsic interference
Solution Approach 1:
The system dynamically switches between two communication modes (first conductive i2i communication mode and second conductive i2i communication mode) based on detected interference levels. The controller monitors communication quality and adapts the operating mode in real-time, allowing the system to maintain energy efficiency while improving reliability through adaptive mode switching.
Solution Approach 2:
The system changes operational parameters by switching between different communication modes with distinct characteristics. The first mode uses regular communication for normal conditions, while the second mode uses reduced communication for low-interference conditions, thereby adjusting system behavior to match environmental conditions and resolve the reliability-energy efficiency tradeoff.
2Reliability
If the controller continuously monitors communication quality and switches modes frequently, then communication reliability is improved, but device complexity and power consumption increase
Solution Approach 1:
The controller performs message validation operations periodically rather than continuously, checking for invalid messages at specific intervals during the first conductive i2i communication mode. This periodic monitoring reduces the computational burden on the controller while still maintaining adequate surveillance of communication quality, thereby reducing complexity and power consumption.
Solution Approach 2:
The system uses the existing conductive communication infrastructure and electrodes to perform communication and validation functions without requiring separate dedicated validation hardware. The controller leverages the same communication pathway to both transmit messages and detect their validity, eliminating the need for additional complex validation circuitry.
3Reliability
If the system transmits communication messages frequently to maintain synchronization, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The system transmits conductive i2i communication messages periodically rather than continuously. During the second conductive i2i communication mode, the controller transmits outgoing conductive i2i beacon messages less frequently than during the first mode, reducing power consumption while maintaining sufficient synchronization through strategic periodic transmissions.
Solution Approach 2:
The transmission frequency is dynamically adjusted based on the operational mode. The controller adapts the message transmission rate to match the communication mode requirements, using higher frequency transmissions during the first mode for robust synchronization and lower frequency transmissions during the second mode for energy conservation, thereby resolving the power-reliability contradiction.
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 adapting communication modes based on interference levels, maintaining synchronization while conserving battery life.
Implementation Method 1
Conductive communication involves transmitting and receiving communication signals through patient tissue
Data Source
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.