Pacemaker Dependency Assessment Using Periodic Pacing Metrics

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Solution Overview

Problem

Existing cardiac pacemakers do not assess the continued dependency on demand cardiac pacing, leading to potential unnecessary electrical stimulation and associated disadvantages such as cardiac structure and function deterioration, device infection, and inconvenience of follow-up visits.

Innovation Solution

An implantable medical device (IMD) is configured to determine metrics indicative of the need for continued cardiac pacing by sensing cardiac electrical signals and delivering pacing pulses, operating in modes like suspend and step-down to collect data for generating graphical representations for clinician review.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If demand cardiac pacing is delivered continuously after pacemaker implantation, then cardiac electrical activity is maintained, but unnecessary electrical stimulation causes detrimental effects on cardiac structure and function

Engineering Contradiction:

Improvecardiac electrical activity maintenanceVSAvoidcardiac structure and function deterioration

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The pacemaker implements periodic assessment cycles to determine ongoing pacing dependency. The device alternates between delivering demand cardiac pacing and assessing whether the patient still requires pacing support, using structured protocols that periodically evaluate intrinsic cardiac activity and pacing dependency metrics

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system continuously monitors cardiac electrical signals and pacing response to determine ongoing dependency. Assessment metrics including intrinsic heart rate, pacing capture, and hemodynamic response provide feedback to the control circuitry, which adjusts pacing delivery based on determined dependency status

Inventive Principle:

Principle #23Feedback

2Reliability

If demand cardiac pacing is delivered continuously, then heart rate is maintained, but device infection risk increases

Engineering Contradiction:

Improveheart rate maintenanceVSAvoiddevice infection

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The pacemaker uses periodic assessment protocols to reevaluate pacing dependency at scheduled intervals. During assessment periods, the device may temporarily suspend or reduce pacing to test intrinsic cardiac function, thereby reducing cumulative exposure and associated infection risk while maintaining heart rate control when needed

Inventive Principle:

Principle #19Periodic action

3Reliability

If unnecessary cardiac pacing is delivered, then cardiac function is maintained, but follow-up office visits become inconvenient

Engineering Contradiction:

Improvecardiac functionVSAvoidfollow-up visit convenience

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The pacemaker autonomously performs periodic assessments of pacing dependency using built-in sensors and processing circuitry. The device automatically determines whether continued pacing is necessary based on monitored cardiac parameters, eliminating the need for manual clinical evaluations and reducing follow-up visit requirements

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

Inventive Principle:

Principle #23Feedback

4Reliability

If pacemaker dependency is not assessed, then pacing is always available, but data-driven decision making for discontinuation is unavailable

Engineering Contradiction:

Improvepacing availabilityVSAvoidpacemaker dependency assessment data

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The pacemaker performs preliminary assessments during initial implantation and scheduled follow-up periods to establish baseline pacing dependency. These preliminary data collections enable informed decisions about whether to implant permanent pacemakers or discontinue temporary pacing support

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12564721B2Assessing pacemaker dependency

Publication Date: 2026.03.03 MEDTRONIC INC

AI summary

A system includes an implantable medical device (IMD) and processing circuitry. The IMD includes sensing circuitry configured to sense cardiac electrical signals of a patient, and therapy delivery circuitry configured to deliver demand cardiac pacing to a heart of the patient based on the cardiac electrical signals. The processing circuitry is configured to: determine, for each of a plurality of time units, based on the cardiac electrical signals and the delivery of demand cardiac pacing during the time units, a plurality of metrics indicative of a need for continued delivery of demand cardiac pacing to the heart of the patient. The plurality of metrics includes a metric associated with a duration of one or more pacing episodes during the time unit. The processing circuitry is further configured to generate a graphical representation of the plurality of metrics of the plurality of time units for presentation to a user.