Receiver Amplifier Timing for Implantable Device Communication
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Solution Overview
Problem
Existing methods for conducted communication with leadless implantable medical devices (LIMDs) face challenges such as high power consumption and potential tissue stimulation due to asynchronous communication timing, which can reduce battery life and cause unintended cardiac stimulation.
Innovation Solution
Implementing a receiver amplifier with a receive window timing (RWT) module that switches between different timing schemes to manage power usage and prevent tissue stimulation, allowing for synchronous conducted communication by maintaining a persistent active receive window before establishing communication and switching to shorter receive windows with inactive intervals after synchronization is achieved.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If asynchronous communication timing is used with LIMDs, then communication can be established between devices, but power consumption increases and tissue stimulation may occur
Solution Approach 1:
The receiver amplifier is activated periodically in synchronized receive windows rather than continuously or asynchronously. The controller manages the receiver amplifier's operation by enabling it only during predetermined receive windows that are synchronized with transmit windows, creating a periodic on-off cycle that reduces power consumption while maintaining communication reliability
Solution Approach 2:
The system establishes synchronization between transmit and receive windows through feedback mechanisms. The controller monitors communication status and adjusts the receiver amplifier timing based on detected synchronization state, ensuring that receive windows align with transmit windows to prevent tissue stimulation while optimizing power usage
2Reliability
If the receiver amplifier remains continuously active, then communication can be reliably received, but power consumption increases reducing battery life
Solution Approach 1:
The receiver amplifier operates periodically during synchronized receive windows rather than continuously. The controller enables the receiver amplifier only during predetermined time intervals when communication is expected, creating a periodic operation pattern that extends battery life while maintaining adequate communication reception reliability through proper timing synchronization
Solution Approach 2:
The system dynamically adjusts the receiver amplifier's operational state based on synchronization status. The controller modifies the receiver amplifier timing and duration according to the detected synchronization state, enabling the amplifier only when needed for communication reception, thereby extending battery life without compromising communication reliability
3Device complexity
If asynchronous communication timing is used, then device simplicity is maintained, but tissue stimulation risk increases
Solution Approach 1:
The controller implements feedback mechanisms to monitor synchronization status and adjust receiver amplifier timing accordingly. This feedback control ensures that communication signals are transmitted and received during appropriate timing windows that avoid tissue stimulation periods, while the system maintains relatively simple asynchronous device architecture
Solution Approach 2:
The system uses periodic synchronized receive windows that are predetermined and aligned with transmit windows. This periodic timing structure inherently avoids tissue stimulation periods by ensuring communication occurs only during safe windows, maintaining device simplicity while eliminating the harmful effect of tissue stimulation
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 reduces power consumption and minimizes the risk of tissue stimulation, extending battery life and ensuring reliable, low-power communication between LIMDs while maintaining synchronization for coordinated heart pacing.
Implementation Method 1
The electrodes are configured to deliver energy to stimulate the heart and to transfer information, through conducted communication, to or from a separate device
Data Source
AI summary
Methods and systems are described for managing synchronous conducted communication for an implantable medical device (IMD). The IMD further comprises electrodes and sensing circuitry. The sensing circuitry is configured to detect physiologic events. A receiver amplifier is coupled to the electrodes. The receiver amplifier is configured to receive conducted communications signals via the electrodes. A controller is configured to establish synchronous conducted communication with a transmit device. The controller includes a receive window timing (RWT) module configured to manage an on-off cycle of the receiver amplifier based on first and second receive window timing schemes. The RWT module switches between the first and second receive window timing schemes based on a condition of the synchronous conducted communication.