Deriving 12-Lead ECG from Six Electrodes via Heart Vector Calculation
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Solution Overview
Problem
Conventional methods for deriving a standard 12-lead electrocardiogram require a large number of electrodes, making them inconvenient for emergency or at-home use and prone to errors due to complex electrode placement and signal conversion processes, which can lead to inaccurate diagnoses.
Innovation Solution
A method using a minimum number of electrodes placed at specific positions on the body, including four electrodes for limb leads and two for chest leads, to calculate an instantaneous heart vector and derive the remaining leads, minimizing errors and simplifying electrode attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ten electrodes are attached to the body surface for standard 12-lead electrocardiogram measurement, then measurement precision is improved, but device complexity and ease of operation deteriorate
Solution Approach 1:
The patent extracts only the essential electrodes needed for accurate electrocardiogram measurement. Instead of using all ten conventional electrodes, the invention uses a reduced set of six electrodes (four limb electrodes and two chest electrodes) while maintaining measurement precision through selective extraction of critical measurement points.
Solution Approach 2:
The patent makes the reduced electrode set universally functional by enabling it to derive all twelve leads through mathematical calculations. The six electrodes serve multiple functions: they simultaneously provide data for limb leads, chest leads, and vectorcardiogram derivation, replacing the need for dedicated electrodes for each lead type.
2Reliability
If ten electrodes are used for comprehensive heart disease diagnosis, then reliability is improved, but ease of operation and loss of time worsen
Solution Approach 1:
The patent removes unnecessary electrodes from the conventional ten-electrode system, retaining only the six essential electrodes needed for reliable heart disease diagnosis. This extraction reduces attachment complexity while preserving diagnostic reliability through strategic selection of critical electrode positions.
Solution Approach 2:
The patent performs preliminary mathematical preparation by establishing calculation algorithms that can derive all twelve leads from the reduced six-electrode configuration. This preliminary action ensures that the simplified electrode setup maintains diagnostic reliability through pre-computed lead derivations.
3Measurement precision
If six chest leads and four limb leads are measured with ten electrodes, then measurement precision is improved, but loss of time and device complexity worsen
Solution Approach 1:
The patent extracts the minimum necessary electrodes (six total) to maintain precision in measuring all twelve lead waveforms. By removing four electrodes from the conventional ten-electrode system, the invention reduces attachment time while preserving measurement precision through mathematical derivation of the removed leads.
Solution Approach 2:
The patent changes the measurement parameters by using mathematical calculations to derive lead waveforms rather than direct physical measurement. This parameter change allows the system to obtain all twelve leads from only six electrodes, reducing attachment time while maintaining waveform measurement precision through computational methods.
4Device complexity
If EASI four special positions are used for electrocardiogram detection, then device complexity is reduced, but measurement precision and reliability deteriorate
Solution Approach 1:
The patent adopts an asymmetric electrode configuration that combines the simplicity of reduced electrode numbers with the precision of anatomically appropriate positions. Unlike the symmetric EASI system, this invention places electrodes at asymmetric positions (four limb electrodes and two specifically positioned chest electrodes) that optimize both simplicity and measurement precision for clinical diagnosis.
Solution Approach 2:
The patent applies local quality by positioning electrodes at specific anatomically significant locations rather than using uniform spacing. The four limb electrodes and two chest electrodes are placed at precise locations that capture critical electrical activity, ensuring measurement precision while maintaining device simplicity through selective local positioning.
Data Source
AI summary
Four first electrodes are attached on right clavicle, the vicinity of on left clavicle, on right lowermost rib, and the position on left lowermost rib, corresponding to limb leads 12-lead electrocardiogram (ECG). Two second electrodes are attached on such positions of the living body that correspond to a lead V2 and a lead V4 of 12-lead ECG. First ECG data set correspond to leads I and II of 12-lead ECG. A second ECG data set including the leads V2 and V4. A heart vector is calculated on the first and second ECG data sets, and predetermined first lead vectors of leads I, II, V2 and V4. A third ECG data set including leads V1, V3, V5 and V6 is calculated based on the heart vector and predetermined second lead vectors of leads V1, V3, V5 and V6. A fourth ECG data set from leads III, aVR, aVL and aVF of 12-lead ECG based on the first ECG data set. The 12-lead ECG is derived based on the first to fourth ECG data sets.