Dual Passband Sensing Circuits for Crosstalk Discrimination

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Solution Overview

Problem

Multi-chamber cardiac rhythm management devices face challenges in accurately discriminating between intrinsic activation signals and crosstalk signals, leading to potential misclassification of pacing pulses as premature ventricular contractions, which can result in improper device responses.

Innovation Solution

A cardiac rhythm management device is equipped with both an intrinsic activation sensing circuit and a crosstalk sensing circuit, where the crosstalk sensing circuit has a passband shifted to higher frequencies to distinguish crosstalk signals from intrinsic activations, using a computing device to classify signals based on their passage through both circuits.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a single sensing circuit is used to detect cardiac signals, then the device structure is simple, but the ability to discriminate between intrinsic activation signals and crosstalk signals is insufficient

Engineering Contradiction:

Improvesignal discrimination accuracyVSAvoidsensing circuit structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The sensing function is divided into two separate sensing circuits: an intrinsic activation sensing circuit with a first passband and a crosstalk sensing circuit with a second passband. Each circuit is specialized to detect specific frequency ranges, enabling accurate discrimination between intrinsic signals and crosstalk signals while maintaining a relatively simple overall structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each sensing circuit is designed with distinct frequency response characteristics tailored to its specific detection purpose. The intrinsic activation sensing circuit is optimized for lower frequencies while the crosstalk sensing circuit is optimized for higher frequencies, allowing each component to have local quality optimized for its function.

Inventive Principle:

Principle #3Local quality

2Measurement precision

If the sensing circuit passband is broad to capture all cardiac signals, then signal detection coverage is improved, but the ability to distinguish crosstalk from intrinsic activations deteriorates

Engineering Contradiction:

Improvesignal classification accuracyVSAvoidsignal detection coverage

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The frequency spectrum is segmented into two distinct passbands: a first passband for intrinsic activation signals and a second passband for crosstalk signals. This segmentation allows each sensing circuit to focus on its specific frequency range, achieving both precise classification and comprehensive coverage of different signal types.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The sensing circuits are designed with different frequency response parameters - specifically different passband ranges. By changing the frequency parameter characteristics of each sensing circuit, the system achieves both specialized discrimination capability and broad overall signal detection coverage.

Inventive Principle:

Principle #35Parameter changes

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 enables accurate discrimination of crosstalk signals from intrinsic activations, preventing misclassification and allowing for appropriate device responses, thereby improving patient care by ensuring accurate signal classification.

Implementation Method 1

an intrinsic activation sensing circuit configured to pass signals falling within a first passband, a crosstalk sensing circuit configured to pass signals falling within a second passband, wherein the second passband contains higher frequencies than the first passband

Methodology Applied

Scientific EffectFrequency filtering: Filter (electronic)

Data Source

PatentUS10993674B2Systems and methods for classifying signals of interest in a cardiac rhythm management device

Publication Date: 2021.05.04 PACESETTER INC

AI summary

The present disclosure provides systems and methods for classifying signals of interest in a cardiac rhythm management (CRM) device. A CRM device includes an intrinsic activation sensing circuit configured to pass signals falling within a first passband, a crosstalk sensing circuit configured to pass signals falling within a second passband, wherein the second passband contains higher frequencies than the first passband, and a computing device communicatively coupled to the intrinsic activation sensing circuit and the crosstalk sensing circuit, the computing device configured to classify a signal of interest as one of an intrinsic activation signal and a crosstalk signal based on whether the signal of interest is passed by the intrinsic activation sensing circuit and the crosstalk sensing circuit.