Handheld ECG Device with Real-Time Signal Feedback
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Solution Overview
Problem
Portable ECG devices face challenges in maintaining consistent electrical contact with the patient's skin, leading to invalid recordings due to improper electrode placement, especially when used by untrained individuals outside clinical settings.
Innovation Solution
A handheld ECG acquisition device with multiple receiving channels that monitor output signals for invalid conditions, providing user feedback through visual and auditory cues to correct placement, and detecting transitions from invalid to valid signals to initiate new recordings in a predetermined sequence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a handheld ECG device is used by untrained individuals outside clinical settings, then portability and ease of use are improved, but the reliability of signal acquisition deteriorates due to improper electrode placement and inconsistent contact
Solution Approach 1:
The system continuously monitors the output signal from each receiving channel and provides real-time feedback to the user through visual displays and auditory cues. When invalid signal conditions are detected (such as harmonic of AC line frequency, constant voltage exceeding thresholds, or signal strength changes faster than thresholds), the system signals the user that the handheld device is improperly positioned and instructs on how to correct the placement, enabling users to achieve reliable recordings without clinical training
Solution Approach 2:
The system automatically detects invalid signal conditions and provides guidance for correction, allowing the user to self-correct the electrode placement and maintain consistent contact without requiring external assistance or specialized training. The device monitors its own signal quality and enables the user to service the measurement process independently
2Measurement precision
If the patient maintains electrical contact between skin and electrodes for seconds during recording, then measurement precision is improved, but the difficulty of operation increases due to requiring sustained proper pressure application
Solution Approach 1:
The system provides continuous real-time feedback during the recording process by monitoring signal quality parameters. When contact pressure is insufficient or placement is improper, the system immediately signals the user and provides corrective instructions, allowing the user to maintain proper contact throughout the recording period without requiring advance training on pressure application techniques
3Measurement precision
If adhesive electrodes are affixed to the patient's body for portable recording, then measurement precision is improved, but the ease of operation deteriorates due to challenges in wearing electrodes over significant periods while pursuing normal activities
Solution Approach 1:
The invention extracts the adhesive electrode requirement from the portable ECG measurement system. Instead of requiring adhesive electrodes to be affixed to the body, the system uses handheld electrodes that make temporary contact with the skin at standard locations. This eliminates the burden of wearing adhesive electrodes over significant periods while allowing normal activities, while still achieving sufficient measurement precision through proper handheld placement and real-time signal quality monitoring
Data Source
AI summary
An ECG system and a method for operating a handheld device that provides input to an ECG system are disclosed. The handheld device has a plurality of receiving channels. Each receiving channel includes an electrode that is adapted for receiving electrical signals from a patient's body when the electrode is pressed against the patient's body at a predetermined location on the patient's body. The method includes monitoring an output signal from each of the channels for any of a plurality of invalid signal conditions during a period of time in which the output signal is used to generate a standard lead or precordial lead trace, signaling a user that the handheld device is improperly positioned on the patient's body, and instructing the user on how to correct a placement of the handheld device based on the detected invalid signal condition.