Leadless Pacemaker Atrial Event Detection via Ventricular Artifacts

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Solution Overview

Problem

Current leadless cardiac pacemakers face challenges in accurately detecting atrial events and delivering pacing therapy effectively, particularly in monitoring and treating cardiac conditions that require synchronized ventricular and atrial activity, due to limitations in sensing atrial contractions and pressure changes within the heart.

Innovation Solution

A leadless cardiac pacemaker system that includes a housing with electrodes and a sensing module capable of detecting artifacts during ventricular filling, identifying atrial events, and delivering ventricular pacing therapy based on these events, using a combination of sensors to detect pressure, impedance, strain, sound, rotation, acceleration, voltage, and flow, and employing filters to refine signal frequency bands for accurate timing of pacing pulses.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a leadless cardiac pacemaker is implanted in the ventricle to deliver pacing therapy, then the device complexity is reduced compared to traditional multi-chamber systems, but the ability to accurately detect atrial events is compromised

Engineering Contradiction:

Improvedevice complexityVSAvoiddetection accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent employs motion sensors as intermediary devices that detect mechanical motion artifacts caused by atrial contractions during ventricular filling. These sensors translate mechanical movements into electrical signals that can be processed to identify atrial events, enabling indirect detection without direct atrial contact

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces traditional electrical sensing methods with mechanical sensing approaches. Motion sensors detect physical movements and vibrations in the ventricular blood pool that correspond to atrial contractions, substituting electrical field detection with mechanical motion detection to overcome the limitations of ventricular implantation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Difficulty of detecting and measuring

If motion sensors are used to detect atrial contractions during ventricular filling, then atrial event detection capability is improved, but signal accuracy deteriorates due to noise and artifacts

Engineering Contradiction:

Improvedetection capabilityVSAvoidsignal accuracy

Core Design Contradiction:

Difficulty of detecting and measuringVSMeasurement precision

Solution Approach 1:

The system performs preliminary signal processing operations including filtering and artifact removal before analyzing the motion sensor signals. By pre-processing the signals to eliminate known noise sources and artifacts, the system improves the quality of detected atrial events

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback mechanisms where detected signals are continuously analyzed and refined. The system uses detected motion patterns to adjust detection parameters and confirm atrial events, improving accuracy through iterative validation and feedback loops

Inventive Principle:

Principle #23Feedback

3Productivity

If the pacemaker detects atrial events during ventricular filling, then pacing therapy synchronization is improved, but the reliability of ventricular filling monitoring deteriorates due to signal interference

Engineering Contradiction:

Improvepacing therapy effectivenessVSAvoidmonitoring reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent segments the detection process into distinct phases: ventricular filling detection, atrial event identification, and pacing trigger generation. By dividing the monitoring function into separate detectable parameters, the system can reliably identify atrial events without compromising overall ventricular filling monitoring

Inventive Principle:

Principle #1Segmentation

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

The system enables precise timing of pacing therapy, improving ventricular filling efficiency and replicating a dual-chamber pacing system with a single device, enhancing the management of bradycardia and cardiac resynchronization therapy by accurately identifying atrial contractions and adjusting pacing intervals accordingly.

Implementation Method 1

a sensing module disposed within the housing, the sensing module configured to detect an artifact during ventricular filling and identify an atrial event

Methodology Applied

Scientific EffectPressure sensing: