Wireless ECG Electrode Motes for Patient Monitoring
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Solution Overview
Problem
Current ECG monitoring systems require a large number of electrodes, which affects patient comfort, increases costs, and complicates the monitoring process, while also needing to reduce power and bandwidth requirements for continuous and flexible monitoring, especially in ambulatory and exercising subjects.
Innovation Solution
A wireless ECG system with a reduced number of electrodes that uses a voltage measuring circuit, error detecting circuit, and transmitting circuit to monitor cardiac activity, provide alarms for medical conditions, and adapt to electrode malfunctions by selecting replacement electrodes, utilizing motes and RFID technology for wireless communication and data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large number of electrodes are used for ECG monitoring, then measurement precision and reliability are improved, but patient comfort deteriorates and device complexity increases
Solution Approach 1:
The patent divides the monitoring system into multiple independent wireless sensor nodes (motes), each equipped with one or more electrodes. This segmentation allows the system to use multiple electrodes for accurate ECG measurement while distributing the complexity across separate units, improving patient comfort through wireless operation and reduced centralized hardware burden.
Solution Approach 2:
Each wireless mote is designed as a multi-functional unit that can perform ECG monitoring, wireless communication, and error detection. The system can adaptively select and combine signals from multiple motes to reconstruct full ECG leads, making each electrode serve multiple potential functions depending on which electrodes are functional at any given time.
2Measurement precision
If a large number of electrodes are used for ECG monitoring, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The system segments the ECG monitoring function across multiple simple wireless motes rather than using one complex centralized device. Each mote contains minimal circuitry for voltage detection and wireless transmission, reducing individual unit complexity while achieving comprehensive monitoring through coordination of multiple units.
Solution Approach 2:
The patent replaces complex wired connections and centralized signal processing with wireless communication and distributed processing. Each mote independently detects voltages and transmits data wirelessly, eliminating the need for complex physical wiring harnesses and centralized amplification circuits.
3Reliability
If continuous monitoring is implemented, then reliability is improved, but energy consumption increases
Solution Approach 1:
The wireless motes perform ECG voltage detection continuously but transmit data periodically or event-driven. The system can implement periodic sampling at optimized intervals, maintaining reliable continuous monitoring capability while reducing power consumption by keeping the radio transmitter dormant between transmission events.
Solution Approach 2:
Each mote autonomously performs error detection on its own electrode signals and makes local decisions about when to transmit data. The distributed architecture allows each node to self-manage its power consumption based on signal quality and monitoring needs, optimizing the balance between continuous monitoring and energy usage.
4Ease of operation
If wireless communication is implemented, then patient mobility is improved, but bandwidth requirements and power consumption increase
Solution Approach 1:
The patent extracts and transmits only the essential voltage measurement data from each electrode, rather than transmitting processed ECG waveforms or redundant information. By transmitting raw voltage values at optimized sampling rates, the system minimizes bandwidth requirements while maintaining the ability to reconstruct complete ECG signals at the receiving end.
Data Source
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AI summary
A wireless electrocardiogram (ECG) system is disclosed. The wireless ECG provides for recording potentials on the surface of a body. The wireless ECG includes a plurality of electrodes suitable for attachment to the surface of the body, a voltage measuring circuit for detecting a voltage between a reference voltage level and electrodes, an error detecting circuit, and a transmitting circuit for transmitting the detected voltage signal to a receiver. The disclosed system is robust in that it provides the capability of continuous monitoring of a subject while correcting for defects in an electrode, contact, presence of excessive noise or other developments in addition to providing the customary alarms in the event of disruptions.