CRT Mode Switching Using Mechanical AF Detection

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Solution Overview

Problem

Existing cardiac resynchronization therapy systems face challenges in accurately detecting atrial fibrillation due to the reduced size and noise interference of far-field P-waves, which complicates the use of far-field sensing techniques.

Innovation Solution

The system employs mechanical activity sensing through a motion sensor to confirm the presence of atrial fibrillation, allowing for mode switching between dual-chamber and single-chamber sensing modes to improve P-wave detection accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If far-field P-wave sensing is used to detect atrial fibrillation, then the detection range is improved, but the measurement precision deteriorates due to reduced signal size and noise interference

Engineering Contradiction:

Improvedetection rangeVSAvoidP-wave detection accuracy

Core Design Contradiction:

Area of stationary objectVSMeasurement precision

Solution Approach 1:

The patent introduces mechanical activity sensing as an intermediary mechanism to detect atrial fibrillation. Instead of relying solely on far-field P-wave electrical signals, the system uses motion sensors to detect mechanical contractions of the atria. This intermediary approach allows the system to maintain the broad detection range of far-field sensing while achieving higher measurement precision through mechanical signal detection, which is less susceptible to noise interference.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If dual-chamber sensing mode is used, then the pacing accuracy is improved, but the device complexity increases due to additional sensing requirements

Engineering Contradiction:

Improvepacing accuracyVSAvoidsensing system complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent implements a multi-functional sensing system where the motion sensor serves multiple purposes: it detects atrial mechanical activity for fibrillation detection, monitors ventricular mechanical activity, and provides backup sensing capability. This universal approach allows the system to maintain dual-chamber pacing accuracy while reducing overall device complexity by consolidating sensing functions into a single multi-capable sensor rather than requiring separate electrical sensing circuits for each chamber.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

Enhances the ability to detect atrial fibrillation and adjust P-wave sensitivity levels, ensuring accurate pacing therapy delivery during cardiac resynchronization therapy.

Implementation Method 1

a motion sensor to sense mechanical activity of the patient's heart

Methodology Applied

Scientific EffectMechanical activity sensing:

Data Source

PatentUS12515061B2Cardiac resynchronization therapy mode switching using mechanical activity

Publication Date: 2026.01.06 MEDTRONIC INC

AI summary

A method includes determining whether electrical activity is indicative of atrial fibrillation, determining whether mechanical activity is indicative of atrial fibrillation, and adjusting a pacing parameter or mode based on whether the electrical activity and the mechanical activity are indicative of atrial fibrillation. The electrical activity may be detected based on a far-field measurement. The method may be performed using a leadless implantable medical device.