Cardiac Pacing Mode Switching via Atrial Cycle Length Detection

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Solution Overview

Problem

Existing implantable medical device (IMD) systems face challenges in automatically switching between atrial-synchronized and atrial-asynchronous ventricular pacing modes based on cardiac signals, particularly in detecting changes in atrial cycle lengths and ensuring appropriate pacing mode switching criteria are met.

Innovation Solution

The IMD system incorporates a sensing circuit to receive cardiac signals with far-field atrial events, a therapy delivery circuit to deliver ventricular pacing pulses, and a control circuit that determines atrial cycle lengths and switches pacing modes based on detected cycle length changes and predefined criteria.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the IMD system uses automatic switching between atrial-synchronized and atrial-asynchronous ventricular pacing modes, then the adaptability to different cardiac conditions is improved, but the device complexity increases

Engineering Contradiction:

Improveadaptability to different cardiac conditionsVSAvoiddevice complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The pacemaker implements dynamic mode switching between atrial-synchronized ventricular pacing (ASVP) and atrial-asynchronous ventricular pacing (AAVP) based on real-time detection of atrial cycle length changes. The system automatically transitions between fixed and adaptive timing modes to match varying cardiac conditions, making the device dynamically responsive rather than static

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system continuously monitors atrial cycle lengths and uses this feedback to detect significant changes that trigger mode switching. The control circuit receives feedback from the sensing circuit about atrial activity patterns and adjusts pacing mode accordingly, creating a closed-loop control system that adapts to changing cardiac conditions

Inventive Principle:

Principle #23Feedback

2Speed

If the IMD system detects cycle length changes to switch pacing modes, then the responsiveness to atrial activity changes is improved, but the measurement precision requirements increase

Engineering Contradiction:

Improveresponsiveness to atrial activity changesVSAvoidmeasurement precision

Core Design Contradiction:

SpeedVSMeasurement precision

Solution Approach 1:

The sensing circuit is designed to serve multiple functions: it senses atrial events for cycle length determination, detects far-field atrial events, and provides input for mode switching decisions. This multi-functional approach allows the system to respond to atrial activity changes using existing sensing capabilities rather than requiring separate specialized sensors

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentEP3490665B1System for controlling cardiac pacing mode switching

Publication Date: 2025.04.30 MEDTRONIC INC

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AI summary

An implantable medical device system operates in an atrial synchronized ventricular pacing mode and switches to an atrial-asynchronous pacing mode when pacing mode switching criteria are met. A control circuit of the system detects a cycle length change between two atrial cycle lengths determined from a cardiac signal that includes far-field atrial events. If the cycle length change is greater than a change, threshold the control circuit determines if the pacing mode switching criteria are satisfied subsequent to detecting the cycle length change.