Implantable Medical Devices for Accurate Noninvasive Cardiac Mapping
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Solution Overview
Problem
Electrocardiographic imaging (ECGI) is prone to inaccuracies due to the ill-posed nature of the inverse problem, leading to significant errors in cardiac mapping using noninvasive electrical measurements.
Innovation Solution
Implementing an implantable medical device (IMD) with electrodes to provide synchronized electrical data, combined with geometry data, to reconstruct electrical signals on the patient's body surface, and using a monitoring system to enhance cardiac mapping by integrating IMD and electrophysiology data, thereby improving accuracy and enabling closed-loop control without invasive catheters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If noninvasive electrical measurements are used for cardiac mapping, then patient safety is improved by avoiding invasive procedures, but measurement precision deteriorates due to the ill-posed nature of the inverse problem causing significant errors
Solution Approach 1:
The patent combines noninvasive body surface ECG measurements with intracardiac electrogram measurements from an implantable medical device (IMD) to create a hybrid mapping system. This merging of invasive and noninvasive data sources allows the system to maintain patient safety benefits while improving measurement precision through the augmented electrical signal data from the IMD electrodes positioned within the heart chambers.
Solution Approach 2:
The IMD serves as an intermediary device that bridges the gap between noninvasive body surface measurements and direct intracardiac measurements. By utilizing the IMD's electrodes already positioned within the heart for pacing and monitoring, the system gains access to high-quality intracardiac electrical signals without requiring separate invasive mapping procedures, thus improving precision while maintaining safety.
2Measurement precision
If invasive catheters are used for electrophysiology studies, then measurement precision is improved through direct cardiac contact, but device complexity and procedural risk increase
Solution Approach 1:
The patent leverages the multi-functionality of the implantable medical device, which is already implanted for pacing or defibrillation therapy. The same IMD that provides therapeutic functions also serves as a mapping catheter, recording intracardiac electrograms for electrophysiology studies. This eliminates the need for separate invasive mapping procedures, reducing procedural complexity while maintaining high measurement precision through direct cardiac contact.
3Loss of information
If multiple separate procedures are performed for cardiac mapping and rhythm management, then comprehensive cardiac assessment is achieved, but loss of time and patient burden increase
Solution Approach 1:
The patent merges rhythm management therapy delivery and electrophysiology mapping into a single integrated procedure using the implantable medical device. The IMD simultaneously provides therapeutic pacing/defibrillation functions and records intracardiac electrograms for mapping, eliminating the need for separate mapping procedures and reducing total procedural time while maintaining comprehensive cardiac assessment.
Data Source
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AI summary
An example method includes establishing a communications link between an electrophysiology (EP) monitoring system and an implantable medical device (IMD). IMD electrical data is received at the monitoring system via the communications link. The IMD electrical data may be synchronized with EP measurement data to provide synchronized electrical data based on timing of a synchronization signal sensed by an IMD electrode and/or EP electrodes. The method also includes computing reconstructed electrical signals for locations on a surface of interest within the patient's body based on the synchronized electrical data and geometry data. The geometry data represents locations of the EP electrodes, a location of the IMD electrode within the patient's body and the surface of interest.