Implant Communication Quality Monitoring via Packet Timing
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Solution Overview
Problem
Current methods for determining communication quality between implantable medical devices and external instruments are inadequate for real-time applications, particularly in noisy medical settings, as they rely on signal reception quality without accounting for actual data packet transmission delays and interference.
Innovation Solution
A method and system that utilize a processor to determine time variant communication quality indicators by measuring the difference between expected and actual time intervals of data packet transmission, combined with RSSI indicators, to assess the quality of the communication link and present a combined or weighted indicator to the user.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current methods based on signal reception quality are used, then communication quality assessment is simple, but accuracy is insufficient for real-time applications
Solution Approach 1:
The patent implements a feedback mechanism where the receiving device measures the actual time intervals between received data packets and compares them with expected intervals. This feedback loop provides real-time information about communication quality by detecting delays and packet losses, thereby improving measurement accuracy without requiring complex additional hardware.
Solution Approach 2:
The system uses the existing data packet transmission structure to carry quality assessment information. The data packets themselves serve dual purposes: conveying medical data and providing timing information for quality assessment. This self-service approach avoids adding separate complex measurement systems while improving accuracy.
2Reliability
If signal strength based assessment is used, then implementation is straightforward, but it does not account for packet delays and interference
Solution Approach 1:
The patent incorporates preliminary timing information within each data packet, where the transmitting device includes its transmission timestamp. This preliminary action allows the receiving device to calculate actual transmission intervals without needing complex external synchronization systems, making delay detection more reliable while managing measurement complexity.
Solution Approach 2:
The patent replaces traditional signal strength-based mechanical assessment with a timing-based computational approach. By substituting the mechanical signal strength measurement with temporal interval analysis, the system achieves more reliable quality assessment that accounts for packet delays and interference, while the computational nature simplifies the detection process.
Data Source
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AI summary
A method and device are provided for determining quality of a communications link between an external instrument (El) 201 and an implantable medical device (IMD) 101. The method and system receive, at an El, data packets 406 sent at intervals from an IMD and determine, with a processor, an expected time interval 403 between transmit of a first data packet 402 and a second data packet 402. The processor determines a difference between the expected time interval 403 between the transmit of the first data packet 402 and the second data packet 402 and an actual time interval 410 between receipt of the first data packet and the second data packet. The processor of the El also provides a time variant communication quality indicator based on the difference between the expected time interval and the actual time interval between the first data packet and the second data packet.