Leadless Cardiac Implant Atrial Activity Detection
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Solution Overview
Problem
Current leadless cardiac implants struggle to detect atrial activity reliably without additional sensors or complex systems, leading to sub-optimal atrioventricular delay calculations and inaccurate determination of atrial contraction timing.
Innovation Solution
The implementation of an autonomous cardiac implant that analyzes short-term variations in the electrical signal produced by the energy harvester's inertial unit oscillations to detect atrial activity, using the inertial unit as both an energy harvester and atrial contraction detector, without the need for specific sensors, thereby providing reliable information on atrial contraction presence and timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional sensors or complex systems are added to detect atrial activity, then detection reliability improves, but device complexity and size increase
Solution Approach 1:
The inertial unit originally designed solely for energy harvesting is made to serve dual purposes: continuing to harvest mechanical energy from cardiac movements while simultaneously functioning as a sensor to detect atrial activity through analysis of its oscillation signal characteristics
Solution Approach 2:
The device uses its own existing inertial unit and its generated oscillation signals to detect atrial activity, eliminating the need for external or additional sensing systems. The system essentially monitors itself by analyzing variations in its own operational signals
2Measurement precision
If the inertial unit oscillation signal is used to detect atrial activity, then detection accuracy without electro-mechanical bias is improved, but signal analysis complexity increases
Solution Approach 1:
The patent replaces the conventional electrical signal-based detection method (which suffers from electro-mechanical delay bias) with mechanical oscillation signal analysis from the inertial unit, providing direct mechanical measurement of atrial contraction timing without electro-mechanical transformation delays
Solution Approach 2:
Instead of analyzing the entire oscillation signal continuously, the system focuses analysis on specific time windows or particular characteristics of the oscillation signal that contain the relevant atrial activity information, reducing computational complexity while maintaining detection accuracy
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
This approach allows for accurate and reliable detection of atrial activity and adjustment of atrioventricular stimulation delay, reflecting the physiological mechanical contraction of the atrium without introducing electro-mechanical bias, enhancing the synchronization of ventricular and atrial contractions.
Implementation Method 1
The mechanical energy produced by the oscillations of the inertial unit is converted into an electrical signal by means of a transducer
Implementation Method 2
The mechanical energy produced by the oscillations of the inertial unit is converted into an electrical signal by means of a transducer
Data Source
AI summary
An energy harvester converts into electrical energy the external stresses applied to the implant at the heartbeat rhythm. This harvester includes an inertial unit and a transducer delivering an oscillating electrical signal that is rectified and regulated for powering the implant and charging an energy storage component. The instantaneous variations of this electrical signal are analyzed in a detection window following or preceding a ventricular contraction, to obtain atrial activity information representative of the atrium contribution to the electric signal, in particular information about the presence/absence of a spontaneous atrial contraction, and/or parameters making it possible to determine an atrioventricular delay to be applied if the ventricle has to be stimulated.