Reconstructed EKG from Implanted Device Electrograms
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Solution Overview
Problem
Existing methods for extracting information from intracardiac electromyograms (EMGs) are hindered by the unknown and arbitrary orientation of implanted devices, making rapid interpretation by medical personnel challenging, especially in diagnosing cardiac conditions beyond supraventricular and ventricular tachycardias.
Innovation Solution
A system that calculates reconstructed electrocardiogram (rEKG) parameters by comparing intracardiac EMGs with traditional surface EKG patterns using EMG/sEKG correlation parameters, allowing for the transformation of EMG vectors into rEKGs, which can be used for diagnostic and therapeutic purposes, and is implemented in implanted devices such as pacemakers and defibrillators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If intracardiac EMGs are recorded from implanted devices, then electrical isolation from external signals is achieved, but the unknown and arbitrary orientation of the device prevents rapid interpretation by medical personnel
Solution Approach 1:
The patent introduces surface EKG as an intermediary reference signal to bridge the gap between intracardiac EMG and traditional EKG interpretation. By comparing EMG with surface EKG, the system translates device-oriented EMG signals into clinically familiar EKG patterns, enabling rapid interpretation while maintaining the electrical isolation benefits of implanted devices
Solution Approach 2:
The patent transforms the interpretation parameter from direct EMG analysis to correlation-based rEKG generation. By calculating EMG/sEKG correlation parameters and generating reconstructed EKGs, the system changes how the data is presented while preserving the original EMG signal quality and isolation characteristics
2Loss of information
If EMG vectors are directly analyzed, then electrical activity is captured, but transformation into clinically useful rEKG requires calculation of correlation parameters
Solution Approach 1:
The patent performs preliminary comparison between surface EKG and intracardiac EMG to establish EMG/sEKG correlation parameters before clinical interpretation. This preliminary action creates a transformation framework that simplifies subsequent rEKG generation, avoiding the need for complex real-time calculations during patient monitoring
Solution Approach 2:
The patent creates a reconstructed EKG (rEKG) as a copy that preserves the essential clinical information from intracardiac EMG while presenting it in the familiar surface EKG format. This copying approach maintains the fidelity of electrical activity capture while simplifying the interpretation process through a familiar visual representation
Data Source
AI summary
A method of reconstruction of the standard 12-lead surface EKG given values of the electrical potential from an implanted medical device is described. This implanted device can be oriented in an arbitrary fashion and reconstruction technique is obtained through physical measurement of the orientation of the implanted device or correlation with a standard 12-lead EKG obtained from the patient.