Ventricular Pacemaker Motion Sensing for Atrial Rate Detection
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Solution Overview
Problem
Existing pacemakers struggle to reliably detect atrial events, particularly atrial P-waves, due to their low amplitude in near-field ventricular cardiac electrical signals, especially when implanted in ventricular chambers, leading to unreliable atrial-synchronized ventricular pacing.
Innovation Solution
A ventricular pacemaker equipped with a motion sensor, such as an accelerometer, detects atrial events from cardiac mechanical signals, determining an atrial rate by analyzing event intervals and harmonics, allowing for adjustment of sensing control parameters to synchronize ventricular pacing with atrial events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ventricular pacemaker uses electrical signals to sense atrial events, then the pacemaker can detect ventricular depolarizations, but the low amplitude of atrial P-waves in near-field ventricular signals makes atrial event detection unreliable
Solution Approach 1:
The patent uses mechanical motion signals from the heart as an intermediary to detect atrial events. Instead of directly sensing electrical P-waves, the accelerometer detects mechanical motion associated with atrial contraction, which then serves as a proxy indicator for atrial events, resolving the low amplitude detection problem
Solution Approach 2:
The patent replaces the electrical sensing system with a mechanical sensing system. An accelerometer is used to detect mechanical motion signals from the heart, substituting the traditional electrical signal detection approach that fails to reliably capture low amplitude atrial P-waves
2Adaptability or versatility
If a single chamber ventricular pacemaker is implanted, then transvenous leads are eliminated, but atrial-synchronized ventricular pacing cannot be provided
Solution Approach 1:
The patent enables a single chamber ventricular pacemaker to perform multiple functions: it can provide both asynchronous ventricular pacing and atrial-synchronized ventricular pacing by detecting atrial events through mechanical motion sensing, eliminating the need for separate atrial and ventricular leads while maintaining dual pacing capabilities
Solution Approach 2:
The patent uses mechanical motion signals as an intermediary to enable atrial sensing capability in a ventricular pacemaker. The accelerometer detects mechanical motion that serves as a mediator to infer atrial events, allowing the ventricular pacemaker to achieve atrial-synchronized pacing without direct atrial lead connection
3Ease of operation
If clinicians manually program and monitor pacemaker parameters, then pacing therapy can be adjusted, but the time and burden on clinicians increase
Solution Approach 1:
The patent enables the pacemaker to automatically determine atrial rates from mechanical motion signals and self-adjust pacing parameters. The device performs self-diagnosis and self-programming by analyzing its own sensed signals, eliminating the need for manual clinician intervention and reducing programming time and burden
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 enhances the reliability of atrial-synchronized ventricular pacing by accurately determining the atrial rate, reducing the time and burden on clinicians for programming and monitoring, and ensuring optimal pacing therapy delivery.
Implementation Method 1
a cardiac motion signal is sensed as an acceleration signal by an accelerometer of the pacemaker
Data Source
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AI summary
A medical device having a motion sensor is configured to sense a motion signal, generate ventricular pacing pulses in a non-atrial tracking ventricular pacing mode and detect atrial event signals from the motion signal during the non-atrial tracking ventricular pacing mode. The medical device may be configured to determine atrial event intervals from the detected atrial event signals, determine a frequency distribution of the determined atrial event intervals and determine an atrial rate based on the frequency distribution of the detected atrial event intervals.