EP Wave Velocity Mapping With Sigmoid Scaling for Arrhythmia Detection

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Solution Overview

Problem

Existing cardiac electrophysiological mapping methods struggle to effectively visualize and diagnose cardiac irregularities due to noise and outliers in low and high velocity ranges, making it difficult to identify clinically relevant intermediate velocity patterns.

Innovation Solution

Applying a nonlinear scaling function, such as a sigmoid function, to suppress extreme velocity values and emphasize intermediate ranges, allowing for improved visualization of cardiac electrophysiological wavefront propagation on anatomical maps.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If linear scaling of velocity magnitudes is used, then the full range of velocity values is preserved, but noise and outliers in low and high velocity ranges obscure clinically relevant intermediate velocity patterns

Engineering Contradiction:

Improvevelocity measurement accuracyVSAvoidintermediate velocity pattern visibility

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent applies a sigmoid function to transform the velocity magnitude parameter, changing the scaling from linear to nonlinear. This transformation compresses the extreme low and high velocity values while expanding the intermediate velocity range, making clinically relevant patterns more visible without losing the underlying velocity measurement data

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The sigmoid function acts as an intermediary transformation layer between the raw velocity measurements and the visual representation. It mediates the display scaling to emphasize intermediate values while suppressing extremes, allowing clinicians to focus on diagnostically relevant velocity patterns

Inventive Principle:

Principle #24Intermediary (Mediator)

2Loss of information

If extreme velocity values are suppressed to reduce noise, then intermediate velocity patterns become more visible, but the full velocity range information is lost

Engineering Contradiction:

Improveintermediate velocity pattern visibilityVSAvoidvelocity magnitude accuracy

Core Design Contradiction:

Loss of informationVSMeasurement precision

Solution Approach 1:

The sigmoid transformation changes the parameter scaling to nonlinearly emphasize intermediate velocities. The transformation preserves the relative ordering and proportional relationships of all velocity values while redistributing their visual weight, maintaining measurement precision through the mathematical properties of the sigmoid function

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If standard vector projection is used, then all velocity magnitudes are displayed uniformly, but clinically relevant intermediate patterns are obscured by extreme values

Engineering Contradiction:

Improvevisualization simplicityVSAvoidintermediate velocity pattern visibility

Core Design Contradiction:

Ease of operationVSLoss of information

Solution Approach 1:

The patent modifies the visualization parameter by applying sigmoid scaling to velocity magnitudes. This creates a nonlinear projection where intermediate velocities are visually emphasized, making clinically relevant patterns more apparent while maintaining the overall vector field structure for ease of interpretation

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12588858B2Weighting projected electrophysiological wave velocity with sigmoid curve

Publication Date: 2026.03.31 BIOSENSE WEBSTER (ISRAEL) LTD

AI summary

A method includes receiving, for at least a region of an anatomical map of at least a portion of a heart, positions and respective electrophysiological (EP) wave propagation velocity vectors, the vectors having respective magnitudes. The magnitudes are nonlinearly scaled. Scaled vectors having the scaled magnitudes, are presented by being overlaid on the anatomical map.