Wearable ECG Monitor Sternal Midline P-Wave Detection
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Solution Overview
Problem
Current ambulatory electrocardiography (ECG) monitoring systems are inadequate for capturing low amplitude cardiac action potential propagation, particularly from the atria, due to challenges in signal fidelity and comfort, leading to incomplete diagnosis of cardiac rhythm disorders and requiring invasive methods for extended monitoring.
Innovation Solution
A lightweight wearable monitor with a flexible extended wear electrode patch and a reusable recorder that positions ECG electrodes along the sternal midline, optimized to sense low amplitude cardiac signals, and allows for easy patient use and replacement, enhancing comfort and monitoring duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ECG monitoring systems are used, then basic cardiac electrical activity can be recorded, but low amplitude P-waves cannot be captured with sufficient fidelity
Solution Approach 1:
The patent applies local quality by placing electrodes at specific anatomical locations (sternal midline, xiphoid process, manubrium) to optimize detection of atrial electrical activity. This localized electrode placement creates optimal sensing vectors for capturing low amplitude P-waves while filtering out interference from other body structures.
Solution Approach 2:
The patent introduces a new spatial dimension for ECG monitoring by positioning electrodes along the sternal midline in a vertical arrangement, rather than using conventional horizontal or standard 12-lead configurations. This dimensional change creates unique sensing vectors that improve P-wave detection capability.
2Duration of action of moving object
If extended monitoring periods are implemented, then sporadic cardiac events can be captured, but patient comfort and usability deteriorate
Solution Approach 1:
The patent segments the monitoring system into a reusable monitor recorder and disposable electrode patches. This allows extended monitoring by simply replacing the electrode patch while keeping the main recording device, thereby extending duration without proportionally increasing complexity or reducing comfort.
Solution Approach 2:
The patent employs disposable electrode patches that are inexpensive and easily replaced. These single-use patches eliminate skin irritation and adhesive residue issues associated with long-term wear of reusable electrodes, maintaining patient comfort throughout extended monitoring periods.
3Measurement precision
If standard ECG electrode placement is used, then general cardiac activity can be monitored, but P-wave specific detection is insufficient
Solution Approach 1:
The patent specifies precise anatomical locations for electrode placement (xiphoid process, manubrium, sternal midline) to optimize P-wave detection. This localized approach concentrates sensing capability where it is most needed for atrial activity detection.
Solution Approach 2:
The patent includes preliminary marking indicators on the skin or electrode patches that guide proper electrode placement before monitoring begins. This preliminary action simplifies the placement process and ensures optimal positioning for P-wave detection without requiring complex procedures.
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
The solution significantly improves the capture of atrial activation signals, enabling extended, comfortable, and user-friendly ECG monitoring, facilitating accurate diagnosis of cardiac rhythm disorders without the need for invasive procedures.
Implementation Method 1
ECG measures the electrical signals emitted by the heart as generated by the propagation of the action potentials that trigger depolarization of heart fibers
Data Source
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AI summary
Physiological monitoring is provided through a lightweight wearable monitor (12) that includes a flexible extended wear electrode patch (15) and a reusable monitor recorder (14) that removably snaps into a receptacle (25) on the electrode patch (15). The wearable monitor (12) sits centrally along the sternum (13) oriented top-to-bottom. Placement of the wearable monitor (12) in a location at the sternal midline (16), with its unique narrow "hourglass"-like shape, significantly improves the ability of the wearable monitor (12) to cutaneously sense cardiac electrical potential signals, particularly P-wave and QRS interval signals indicating ventricular activity in ECG waveforms. The monitor recorder (12) includes an ECG sensing circuit that measures raw cutaneous electrical signals using a driven reference containing power supply noise and system noise to the reference lead, which is critical to preserving characteristics of low amplitude cardiac action potentials, particularly P-waves (121).