Pacemaker–Defibrillator Signal Coordination for Tachycardia Detection

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Solution Overview

Problem

Existing implantable therapy systems face challenges in ensuring reliable coexistence and communication between an implantable pacemaker device and a non-transvenous defibrillator device, leading to potential false detection of tachycardia due to interference from cardiac stimulation signals.

Innovation Solution

The system includes an implantable pacemaker device configured to transmit an advertising signal for cardiac stimulation, which the non-transvenous defibrillator device receives to modify its processing functions, preventing false detection of tachycardia by adjusting its operations based on the timing and nature of the pacemaker's stimulation signals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the pacemaker device transmits cardiac stimulation signals, then intracardiac pacing is achieved, but false detection of tachycardia may occur due to signal interference

Engineering Contradiction:

Improvereliable operation of both devicesVSAvoidaccurate detection of heart rhythm

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The pacemaker device transmits an advertising signal before emitting the cardiac stimulation signal. This preliminary action allows the defibrillator device to prepare its processing functions in advance, temporarily suspending or adjusting its tachycardia detection algorithms during the expected stimulation period, thereby preventing false detection while maintaining reliable operation of both devices

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The advertising signal acts as an intermediary communication between the pacemaker and defibrillator devices. It carries information about the upcoming cardiac stimulation signal, enabling the defibrillator to distinguish between therapeutic stimulation and pathological tachycardia, thus maintaining measurement precision despite the presence of stimulation signals

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If the defibrillator device monitors cardiac signals continuously, then tachycardia detection capability is maintained, but interference from pacemaker stimulation signals causes false detection

Engineering Contradiction:

Improvetachycardia detection accuracyVSAvoidsignal interference from pacemaker

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The defibrillator device receives feedback information from the pacemaker's advertising signal about the timing and characteristics of upcoming stimulation signals. Based on this feedback, the defibrillator dynamically adjusts its monitoring and processing functions, temporarily suspending tachycardia detection during stimulation periods and resuming afterward, thereby maintaining detection accuracy while filtering out pacemaker interference

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The defibrillator's processing functions are made dynamic rather than static. It can temporarily suspend or modify its tachycardia detection algorithms in response to receiving advertising signals, adapting its monitoring behavior to the operational state of the pacemaker. This dynamic adjustment eliminates false detection while maintaining continuous overall monitoring capability

Inventive Principle:

Principle #15Dynamics

3Device complexity

If both pacemaker and defibrillator devices operate independently, then device complexity is reduced, but communication and coordination between devices is compromised

Engineering Contradiction:

Improvesystem architecture simplicityVSAvoidcoordinated operation of devices

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

A simple advertising signal mechanism serves as an intermediary communication channel between the pacemaker and defibrillator devices. This minimal communication infrastructure allows the pacemaker to inform the defibrillator about upcoming stimulation signals without requiring complex bidirectional communication protocols, thus maintaining device simplicity while enabling coordinated operation and preventing false tachycardia detection

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentEP4433154B1Implantable therapy system for an antibradycardia and antitachycardia stimulation

Publication Date: 2025.10.22 BIOTRONIK SE & CO KG

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AI summary

An implantable therapy system for an antibradycardia and antitachycardia stimulation comprises an implantable pacemaker device (1) for emitting a cardiac stimulation signal (S2) for achieving an intra-cardiac pacing, and an implantable non-transvenous defibrillator device (2) for emitting a shock pulse for achieving a defibrillation. The implantable pacemaker device (1) is configured to transmit an advertising signal (S1) for advertising said cardiac stimulation signal (S2). The implantable non-transvenous defibrillator device (2) is configured to receive said advertising signal (S1) and to modify at least one processing function in response to receiving said advertising signal (S1).