Dynamic Receive Threshold for Implanted Medical Device Communication
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Solution Overview
Problem
Existing systems for communicating between medical devices implanted in a patient's body face challenges in effectively filtering out noise from conducted communication signals, which can interfere with the transmission of valid messages.
Innovation Solution
The proposed solution involves adjusting the receive threshold of medical devices based on the amplitude of the received conducted communication signal, using techniques such as increasing the threshold if noise is detected, and resetting timers to ensure reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the receive threshold is set low to detect weak communication signals, then signal detection capability is improved, but noise rejection capability deteriorates
Solution Approach 1:
The receive threshold is made dynamic rather than fixed. The device automatically adjusts the threshold level based on real-time signal conditions, switching between lower thresholds for weak signal detection and higher thresholds for noise rejection. This dynamic adaptation resolves the contradiction by allowing the threshold to optimize for different operating conditions.
Solution Approach 2:
The receive threshold parameter is changed based on signal characteristics. The device monitors incoming signals and modifies the threshold parameter accordingly - lowering it when weak communication signals are detected and raising it when noise dominates, thus achieving both sensitive detection and effective noise filtering.
2Reliability
If noise filtering is increased to improve signal quality, then communication reliability is improved, but signal detection sensitivity deteriorates
Solution Approach 1:
The noise filtering level is made dynamic, with the device automatically adjusting filter strength based on the detected signal-to-noise ratio. When communication signals are present, filtering is increased for reliability; when signals are absent or weak, filtering is reduced to maintain detection sensitivity.
Solution Approach 2:
The device uses feedback from signal monitoring to control the filtering level. By continuously analyzing received signals and adjusting filtering accordingly, the system achieves high communication reliability without permanently sacrificing detection sensitivity, as the filter adapts based on actual signal conditions.
3Object-affected harmful factors
If the communication threshold is adjusted dynamically to reject noise, then noise rejection capability is improved, but device complexity increases
Solution Approach 1:
The device performs self-adjustment of the receive threshold using built-in signal analysis capabilities. Rather than requiring external calibration or complex control systems, the device autonomously monitors its own reception conditions and modifies the threshold accordingly, achieving noise rejection without proportionally increasing complexity.
Solution Approach 2:
A feedback loop within the device connects signal reception quality directly to threshold adjustment. The simple feedback mechanism compares received signal levels against noise floors and automatically sets appropriate thresholds, providing effective noise rejection through a relatively simple closed-loop control structure.
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 enhances the signal-to-noise ratio, allowing medical devices to accurately receive and interpret communication signals, thereby improving the reliability and effectiveness of communication between implanted medical devices.
Implementation Method 1
conducted communication, which conducts electrical current through the patient's body tissue from one device to the other
Data Source
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AI summary
Systems and methods for conducted communication are described. In one embodiment, a method of communicating with a medical device implanted within a patient comprises receiving, at a medical device via electrodes connected to the patient, a conducted communication signal, wherein the conducted communication signal comprises a signal component and a noise component. The method may further comprise adjusting, by the medical device, a receive threshold based at least in part on an amplitude of the received conducted communication signal so as to reduce an amplitude of the noise component of the conducted communication signal.