Pulse Edge Demodulation for Shared-Wire Implant Communication
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Solution Overview
Problem
Implantable biomedical devices separated into remote and main units face challenges in transmitting power and data due to size and mass constraints, requiring efficient communication methods to minimize interference and reduce the number of wires needed.
Innovation Solution
Pulse edge modulation of digital carrier signals is used to transmit power and data between the main and remote units, with the modulated signal being demodulated at the remote unit to obtain digital data, and uplink data transmission occurring during steady states to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the implantable device is separated into remote and main units, then the size and mass constraints are satisfied, but interference between downlink and uplink transmissions increases
Solution Approach 1:
The patent implements periodic action by scheduling uplink data transmission to occur only during steady-state periods when the downlink modulated signal is not transitioning. This time-division approach ensures that uplink transmissions do not interfere with downlink transmissions, resolving the interference problem while maintaining the separated remote and main unit architecture
Solution Approach 2:
The system dynamically adjusts the timing of uplink transmissions based on the state of the downlink signal. By detecting when the downlink signal is in steady state versus transition, the system adaptively enables or disables uplink transmission, optimizing communication reliability while maintaining the benefits of unit separation
2Power
If DC power is transmitted to the remote unit, then power transmission is achieved, but tissue damage from DC power leakage may occur
Solution Approach 1:
The patent changes the electrical parameter of the transmitted power from direct current (DC) to alternating current (AC). By using AC coupled signals for power transmission, the system eliminates the risk of DC power leakage causing tissue damage while still achieving effective power delivery to the remote unit. This parameter change fundamentally resolves the safety issue
3Device complexity
If the number of transmission lines is reduced, then device complexity is decreased, but interference between signals increases
Solution Approach 1:
The patent makes the transmission lines universal by using the same set of wires for both downlink and uplink communications. Through pulse edge modulation and time-division multiplexing, the system enables bidirectional communication over shared transmission lines, reducing the total number of wires needed while maintaining signal integrity through intelligent timing control
Data Source
AI summary
Systems and methods for the demodulation of pulse edge modulated signals for communications systems which are useful in body implanted electronics. A pulse edge modulated signal is generated by retarding or advancing each pulse edge of a carrier to be modulated relative to its original position in time, depending on the state of the digital bit to be modulated on that edge. Each modulated edge of a pulse edge modulated signal is demodulated by determining the position in time of the modulated edge relative to the original respective position of the modulated edge prior to modulation.