Pacemaker Motion Signal Parameter Setting for Atrial Event Detection

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Solution Overview

Problem

Existing implantable cardiac pacemakers struggle to reliably detect atrial events for synchronized ventricular pacing, particularly when positioned subcutaneously, as atrial signals are difficult to discern from cardiac electrical signals.

Innovation Solution

A pacemaker with a motion sensor, such as an accelerometer, is used to detect atrial events from motion signals, setting sensing parameters based on features like amplitude and time intervals to synchronize ventricular pacing with atrial contractions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a motion sensor is used to detect atrial events, then the reliability of atrial event detection is improved, but the device complexity increases

Engineering Contradiction:

Improveatrial event detection reliabilityVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces the traditional electrical sensing system with a motion sensor-based mechanical detection system. The motion sensor detects atrial mechanical events (atrial contraction and valve closure) and converts them into electrical signals for processing, thereby improving detection reliability without requiring complex atrial electrode configurations.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The motion sensor acts as an intermediary between the mechanical atrial events and the electrical sensing system. It detects mechanical motion and converts it to electrical signals, serving as a bridge that enables reliable atrial event detection through a single sensor rather than requiring multiple electrodes.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If atrial-synchronized ventricular pacing is implemented, then the cardiac rhythm management precision is improved, but the difficulty of detecting and measuring atrial events increases

Engineering Contradiction:

Improvecardiac rhythm management precisionVSAvoiddifficulty of detecting atrial events

Core Design Contradiction:

Measurement precisionVSDifficulty of detecting and measuring

Solution Approach 1:

The system substitutes electrical atrial signal detection with motion-based detection. By using a motion sensor to detect mechanical atrial contraction and valve closure events, the system achieves precise atrial event detection without the difficulties associated with detecting small electrical signals in the presence of noise.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the detection parameter from electrical signal amplitude to motion signal characteristics. By analyzing motion signal features such as amplitude, duration, and timing relative to ventricular events, the system achieves precise atrial event detection and synchronization.

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If sensing parameters are set based on motion signal features from multiple ventricular cycles, then the measurement precision of atrial events is improved, but the time required for parameter establishment increases

Engineering Contradiction:

Improvemeasurement precision of atrial eventsVSAvoidtime required for parameter establishment

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The system performs preliminary detection and analysis of motion signal features during an initial period when the patient is in a known rhythm state. By establishing sensing parameters based on motion signal features from multiple ventricular cycles during this preliminary phase, the system prepares accurate detection parameters in advance, enabling precise atrial event detection without requiring continuous time-consuming analysis.

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

Enables reliable atrial-synchronized ventricular pacing without requiring atrial sensors, improving cardiac rhythm management by accurately detecting atrial events from motion signals.

Implementation Method 1

A cardiac pacemaker implanted subcutaneously may be a single chamber pacemaker coupled to one transvenous medical lead for positioning electrodes in one heart chamber, atrial or ventricular, or a dual chamber pacemaker coupled to two intracardiac leads for positioning electrodes in both an atrial and a ventricular chamber

Methodology Applied

Scientific EffectVibration: Vibration

Data Source

PatentUS20260021310A1Method and apparatus for establishing parameters for cardiac event detection

Publication Date: 2026.01.22 MEDTRONIC INC

AI summary

A medical having a motion sensor is configured to set an atrial event sensing parameter used for sensing atrial event signals from a motion signal produced by the motion sensor. The medical device sets an atrial event sensing parameter by applying a sensing window during each one of multiple ventricular cycles, determining a feature of the motion signal during the sensing window for at least a portion of the ventricular cycles, and setting the atrial event sensing parameter based on the determined features. The medical device may sense the atrial event from the motion signal according to the atrial event sensing parameter.