Intracardiac Pacemaker Atrial Tracking via Motion Sensor

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Solution Overview

Problem

Existing intracardiac pacemakers struggle to reliably detect atrial events from cardiac electrical signals alone, which limits their ability to provide atrial-synchronized ventricular pacing effectively.

Innovation Solution

The use of a motion sensor to detect atrial systolic events and ventricular diastolic events, allowing the pacemaker to set appropriate detection thresholds and intervals for controlling atrial-synchronized ventricular pacing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single chamber pacemaker with transvenous lead is used for ventricular pacing, then the device structure is simplified and implantation is easier, but the ability to detect atrial events and provide atrial-synchronized ventricular pacing is lost

Engineering Contradiction:

Improvepacemaker structureVSAvoidatrial event detection capability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The intracardiac ventricular pacemaker is designed to perform both ventricular pacing and atrial event detection functions using a single device and lead system. The pacemaker incorporates a motion sensor that can detect both ventricular mechanical events and atrial systolic events, eliminating the need for separate atrial and ventricular leads while maintaining dual-chamber pacing capability

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

A motion sensor is introduced as an intermediary component to detect atrial mechanical events indirectly through body wall motion. This allows the pacemaker to sense atrial systolic events without direct electrical contact with the atrium, resolving the contradiction between simplified structure and reliable atrial event detection

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If atrial-synchronized ventricular pacing is implemented using traditional dual chamber pacemakers with separate leads, then reliable atrial event detection is achieved, but device complexity and implantation difficulty increase

Engineering Contradiction:

Improveatrial event detection accuracyVSAvoidlead system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The ventricular lead is designed to serve multiple functions: delivering ventricular pacing pulses, sensing ventricular electrical events, and detecting atrial mechanical events through the motion sensor. This multi-functional approach eliminates the need for a separate atrial lead while maintaining reliable atrial event detection capability

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The electrical sensing system is supplemented or replaced by a mechanical sensing system (motion sensor) for detecting atrial events. This substitution allows atrial event detection through mechanical motion detection rather than electrical signal sensing, simplifying the lead system while maintaining detection reliability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If the detection threshold is set high to avoid false detections during ventricular diastole, then false positive detections are reduced, but sensitivity to detect fused atrial-ventricular events is lost

Engineering Contradiction:

Improvefalse detection rateVSAvoidatrial event detection sensitivity

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The detection threshold is made dynamic rather than fixed, automatically adjusting its level based on the timing phase of the cardiac cycle. The threshold is higher during ventricular diastole to avoid false detections from passive filling motions, and lower during the atrial systolic window to enhance sensitivity for detecting fused events

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The pacemaker pre-sets different detection thresholds for different time intervals within the cardiac cycle. By anticipating when atrial events are expected to occur and when ventricular diastolic motions occur, the system prepares appropriate threshold levels in advance, resolving the contradiction between false detection avoidance and event detection sensitivity

Inventive Principle:

Principle #10Preliminary action

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 pacemaker to accurately synchronize ventricular pacing with atrial events, improving heart rhythm regulation and maintaining regular cardiac function.

Implementation Method 1

a motion sensor configured to produce a motion signal including an atrial systolic event and a ventricular diastolic event indicating a passive ventricular filling phase

Methodology Applied

Scientific EffectMotion detection:

Data Source

PatentUS20250114616A1Atrial tracking in an intracardiac ventricular pacemaker

Publication Date: 2025.04.10 MEDTRONIC INC

AI summary

An intracardiac ventricular pacemaker having a motion sensor is configured to produce a motion signal including an atrial systolic event and a ventricular diastolic event indicating a passive ventricular filling phase, set a detection threshold to a first amplitude during an expected time interval of the ventricular diastolic event and to a second amplitude lower than the first amplitude after an expected time interval of the ventricular diastolic event. The pacemaker is configured to detect the atrial systolic event in response to the motion signal crossing the detection threshold and set an atrioventricular pacing interval in response to detecting the atrial systolic event.