Cross-Chamber Capture Detection in Implantable Cardiac Pacing

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Solution Overview

Problem

Existing cardiac pacemakers struggle to efficiently detect and adjust cardiac therapy in response to cross-chamber capture, particularly in scenarios where pacing in one heart chamber affects the adjacent chamber, leading to inefficiencies and potential tissue trauma.

Innovation Solution

Implantable medical devices with electrodes configured to contact and penetrate heart chambers, allowing for sensing and pacing in multiple chambers, and processing circuitry to identify cross-chamber capture, adjusting therapy parameters based on sensed electrical activity to optimize cardiac pacing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If cardiac pacing is delivered to atrial tissue via a first electrode, then atrial stimulation is achieved, but unintended ventricular capture may occur causing tissue trauma

Engineering Contradiction:

Improveatrial pacing reliabilityVSAvoidventricular tissue trauma

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The device senses electrical activity in both the atrium and ventricle, and uses this feedback to determine whether atrial pacing has caused ventricular capture. Based on this feedback, the device automatically adjusts pacing parameters or delivers counter-stimulation to prevent harmful ventricular capture while maintaining effective atrial pacing.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent introduces an intermediary detection and control mechanism that monitors the electrical interaction between atrial and ventricular chambers. This intermediary system detects ventricular depolarization following atrial pacing and mediates the response by adjusting pacing parameters or delivering protective stimulation, preventing direct harmful effects.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If a device implanted in one chamber attempts to pace multiple chambers, then multi-chamber functionality is achieved, but detection of cross-chamber capture becomes complex

Engineering Contradiction:

Improvemulti-chamber pacing capabilityVSAvoidcapture detection complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The device is designed with multi-functional electrodes that can both pace and sense electrical activity in multiple chambers. The same electrodes used for delivering atrial pacing also detect ventricular electrical activity, eliminating the need for separate sensing leads and simplifying the overall device architecture while maintaining multi-chamber capability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent combines pacing and sensing functions into a unified system where the first electrode delivers atrial pacing and the second electrode (or the same electrode) detects ventricular electrical activity. This merging of functions reduces device complexity by eliminating separate sensing leads and integration interfaces.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If pacing output is increased to ensure atrial capture, then pacing reliability improves, but risk of cross-chamber capture and tissue trauma increases

Engineering Contradiction:

Improvepacing capture reliabilityVSAvoidcross-chamber capture risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The device dynamically adjusts pacing parameters based on real-time detection of ventricular electrical activity. Rather than using fixed high-output pacing, the system continuously monitors for ventricular capture and adapts pacing amplitude, pulse width, or timing to maintain reliable atrial capture while minimizing the risk of harmful ventricular capture.

Inventive Principle:

Principle #15Dynamics

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 detection of ventricular capture in response to atrial pacing, enabling precise adjustment of cardiac therapy to prevent unnecessary stimulation and reduce tissue trauma, thereby improving the efficacy and safety of cardiac pacing.

Implementation Method 1

sensing circuitry configured to sense electrical activity of the first chamber via the first electrode and electrical activity of the second chamber via the second electrode

Methodology Applied

Scientific EffectElectrical activity sensing: Conduction (electrical)

Data Source

PatentUS20250205498A1Detection of ventricular capture from atrial pacing by implantable device

Publication Date: 2025.06.26 MEDTRONIC INC

AI summary

In some examples, a device comprises processing circuitry configured to identify, based on sensed electrical activity of a second chamber, a capture of the tissue of the second chamber in response to delivery of cardiac pacing to the first chamber and adjust the delivery of cardiac pacing to the first chamber in response to the identification of the capture of the second chamber.