Intracardiac Probe Position Map Update During Cardioversion

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Solution Overview

Problem

During intracardiac procedures, cardioversion can alter the properties of position-tracking signals, compromising the accuracy of the position map built by existing tracking systems, as they do not account for cardioversion events.

Innovation Solution

The system computes an estimated position of the probe using position-tracking signals and checks for electrocardiographic signal saturation to determine if a cardioversion is occurring, refraining from updating the position map if the signal is saturated or if the position deviation exceeds predefined thresholds, allowing the system to recover from cardioversion events.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the position map is continuously updated during intracardiac procedures, then the position tracking accuracy is improved, but the reliability deteriorates when cardioversion occurs and saturates the electrocardiographic signal

Engineering Contradiction:

Improveposition tracking accuracyVSAvoidposition map reliability during cardioversion

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The system continuously monitors the electrocardiographic signal to detect saturation conditions and uses this feedback to control the position map updating process. When signal saturation is detected (indicating cardioversion), the system automatically suspends position map updates, preventing corrupted data from degrading map reliability. This feedback mechanism resolves the contradiction by dynamically adjusting the updating behavior based on real-time signal quality.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The position map updating mechanism transitions from a static continuous update approach to a dynamic conditional update approach. The system adapts its updating behavior by switching between continuous updates (when signal is healthy) and suspended updates (when cardioversion is detected), thereby maintaining both high position tracking accuracy during normal operation and high reliability during cardioversion events.

Inventive Principle:

Principle #15Dynamics

2Productivity

If the position map is updated during cardioversion events, then the productivity is improved by continuous tracking, but the measurement precision deteriorates due to signal saturation

Engineering Contradiction:

Improvecontinuous tracking capabilityVSAvoidposition estimation accuracy during cardioversion

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The system takes preliminary anti-action by detecting cardioversion events through electrocardiographic signal saturation before they can corrupt the position map. By proactively identifying the saturation condition and preemptively suspending updates, the system prevents inaccurate position data from being recorded, thereby maintaining measurement precision while minimizing interruption to continuous tracking capability.

Inventive Principle:

Principle #9Preliminary anti-action

3Reliability

If the system refrains from updating the position map during saturated conditions, then the reliability is improved, but the loss of time increases due to paused position tracking

Engineering Contradiction:

Improveposition map accuracyVSAvoidtracking interruption duration

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system implements periodic monitoring of the electrocardiographic signal to detect cardioversion events. By using periodic sampling and threshold-based detection, the system can quickly identify saturation conditions and suspend updates only for the necessary duration. This periodic approach maintains reliability by ensuring updates are paused during saturated conditions while minimizing time loss through efficient detection and rapid resumption of updates when the signal recovers.

Inventive Principle:

Principle #19Periodic 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

This approach maintains the accuracy of the position map during cardioversion procedures by preventing updates during saturated conditions, ensuring reliable probe tracking and position mapping.

Implementation Method 1

a position of an intrabody probe, which includes one or more electrodes and an electromagnetic sensor, within a heart of a subject, based on an induced signal received from the electromagnetic sensor

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS11484369B2Identifying instances of cardioversion while building a position map

Publication Date: 2022.11.01 BIOSENSE WEBSTER (ISRAEL) LTD

AI summary

A method includes computing a position of an intrabody probe, which includes one or more electrodes and an electromagnetic sensor, within a heart of a subject, based on an induced signal received from the electromagnetic sensor, ascertaining a set of properties of signals passed between the electrodes and multiple reference electrodes located at respective reference positions, based on the set of properties, deriving an estimated position of the probe from a position map that maps multiple sets of properties to respective estimated positions, in response to a distance between the computed position and the estimated position being greater than a predefined threshold, ascertaining whether an electrocardiographic signal from the subject is saturated, and in response to the electrocardiographic signal not being saturated, updating the position map so as to map the set of properties to the computed position. Other embodiments are also described.