Implantable Device Atrial Mechanical Activity Detection
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Solution Overview
Problem
It is challenging to determine the mechanical activity of the atrium after an episode of atrial fibrillation and to diagnose atrial atony, which affects the optimization of atrioventricular delay and can lead to suboptimal heart functioning.
Innovation Solution
The device evaluates mechanical atrial activity by measuring endocardial acceleration signals, allowing for the discrimination between normal and absent or deficient atrial activity, and adjusts atrioventricular delay settings accordingly, using techniques such as analyzing peak-to-peak amplitude and standard deviation of the endocardial acceleration signal to determine the presence of atrial atony.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical activity detection is used to trigger ventricular pacing, then ventricular pacing can be delivered after atrioventricular delay, but the actual mechanical behavior of the atrium cannot be determined leading to suboptimal hemodynamic performance
Solution Approach 1:
The patent uses an accelerometer as an intermediary device to detect mechanical atrial activity. The accelerometer measures mechanical movements of the atrium and converts them into electrical signals that can be processed by the implantable device, thereby bridging the gap between mechanical atrial activity and electrical detection systems.
Solution Approach 2:
The patent replaces traditional electrical field-based atrial activity detection with a mechanical detection system using an accelerometer. This substitution allows direct measurement of mechanical atrial contractions, providing accurate information about actual atrial mechanical behavior rather than inferring it from electrical signals.
2Productivity
If atrioventricular delay is optimized based on electrical activity, then pacing timing can be adjusted, but the optimization is ineffective when atrial mechanical activity is absent or deficient
Solution Approach 1:
The patent implements dynamic adjustment of atrioventricular delay based on real-time detection of mechanical atrial activity. The device continuously monitors accelerometer signals and adjusts the AV delay parameter dynamically to match the actual mechanical behavior of the atrium, ensuring optimal hemodynamic performance under varying conditions.
Solution Approach 2:
The patent employs feedback mechanisms where the accelerometer-detected mechanical atrial activity signals are used to adjust the atrioventricular delay setting. The system continuously monitors mechanical atrial contractions and modifies pacing timing parameters based on this feedback, creating a closed-loop control system for optimal performance.
3Adaptability or versatility
If AVD automatic optimization algorithms are run during atrial fibrillation, then pacing parameters can be adjusted, but the results are strongly biased and may cause deleterious effects
Solution Approach 1:
The patent performs preliminary detection and classification of atrial rhythm status using accelerometer signals before executing AVD optimization algorithms. By identifying atrial fibrillation episodes in advance through mechanical activity patterns, the system can prevent execution of inappropriate optimization algorithms that would produce harmful results.
Solution Approach 2:
The patent applies preliminary anti-action by detecting atrial fibrillation conditions and actively preventing the execution of AVD optimization algorithms during these periods. The system recognizes when mechanical atrial activity patterns indicate fibrillation and blocks algorithm execution to avoid generating biased or harmful pacing parameters.
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 enables the device to automatically assess the return of normal atrial activity post-atrial fibrillation, disable ineffective algorithms, and optimize atrioventricular delay, thereby improving hemodynamic performance and preventing potential deleterious effects during atrial fibrillation episodes.
Implementation Method 1
an accelerometer adapted to output an endocardial acceleration signal (EA) representative of the movements produced by the cyclical contractions of the myocardium
Data Source
AI summary
A device includes a lead configured to for use in applying an atrioventricular delay (“AVD”), an acceleration sensor adapted to output an endocardial acceleration signal, and circuitry configured to receive and process said endocardial acceleration signal to provide ventricular pacing by varying, in a controlled manner, the AVD in a range having a plurality of AVD values. The circuitry derives from said endocardial acceleration signal a value of a parameter representative of an component of the endocardial acceleration signal corresponding to the first endocardial acceleration peak associated with an isovolumetric ventricular contraction (“EAX component”), and evaluates a degree of variation of said parameter values as a function of said plurality of AVD values to detect atrial and ventricular events.