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Automated Diagnosis-Assisting Medical Devices Utilizing Pattern Localization Of Quasi-Periodic Signals

a technology applied in the field of automatic diagnosis and medical devices utilizing pattern localization of quasi-period signals, can solve problems such as overlaid noise or other artifacts, and achieve the effects of enhancing existing electronic stethoscopes, not hindering devices from performing their tasks, and enhancing the accuracy of results

Inactive Publication Date: 2014-09-18
CSD LABS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present disclosure describes a method for analyzing heartbeats using a device that does not require any external input from medical professionals or other devices. The device uses signal templates and pre-trained classifiers to search throughout the entire signal for locations where similar signal patterns are found. The algorithm is robust against changes in periodicity, noise, and artefacts. The device can also use feature selection algorithms to reduce feature space and increase computational efficiency. The device can be used on an electronic stethoscope or in combination with a portable device for further analysis and interaction with medical staff. The technical effects of the present disclosure include improved accuracy and efficiency in analyzing heartbeats and increased function of electronic stethoscopes as a medical device.

Problems solved by technology

The signals are typically, but not necessarily limited to being quasi-periodic, and are often overlaid with noise or other artifacts.

Method used

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  • Automated Diagnosis-Assisting Medical Devices Utilizing Pattern Localization Of Quasi-Periodic Signals
  • Automated Diagnosis-Assisting Medical Devices Utilizing Pattern Localization Of Quasi-Periodic Signals
  • Automated Diagnosis-Assisting Medical Devices Utilizing Pattern Localization Of Quasi-Periodic Signals

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Embodiment Construction

[0039]Referring to FIG. 1, a diagrammatic illustrates a rate / frequency estimation algorithm in accordance with one aspect of the present disclosure. At 101, a quasi-periodic input signal, such as an acoustical signal indicative of a physiological rhythm (e.g., heartbeat, respiration), is loaded. At 102, a DC component is removed from the input signal, s, according to sDCrem=s−mean(s), where

mean(x)=1N∑n=1Nx(n)

where is the mean operator, sDCram, is the input signal having its DC component removed, and N is the length of x.

[0040]At 103, filtering of the input signal is applied to produce a pre-processed signal that emphasizes the quasi-periodic patterns of the signal for rate estimation (e.g., the heart sound S1 and S2 in a phonocardiogram). The filtering is performed with a standard band-pass filter (high-pass filtering and / or low-pass filtering) or with wavelet filtering. In accordance with wavelet filtering, the signal is decomposed into detail and approximation coefficients, and, a...

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Abstract

A method for localizing a pattern in a quasi-periodic signal includes estimating, using a controller, a rate or a frequency of a quasi-periodic signal, and defining a search window based on the estimated rate or frequency of the quasi-periodic signal. A starting position is defined in the received quasi-periodic signal, the starting position corresponding to a first maximum. A portion of the quasi-periodic signal in the search window is cross-correlated with a template signal pattern to be matched to produce a second maximum. The second maximum is defined by the controller as a new starting position. The new starting position is stored.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of and priority to U.S. Provisional Patent Application No. 61 / 787,998, titled “Automated Diagnosis-Assisting Medical Devices Utilizing Rate / Frequency Estimation And Pattern Localization Of Quasi-Periodic Signals” and filed on Mar. 15, 2013, which is incorporated herein by reference in its respective entirety.COPYRIGHT[0002]A portion of the disclosure of this patent document contains material which is subject to copyright protection. The copyright owner has no objection to the facsimile reproduction by anyone of the patent disclosure, as it appears in the Patent and Trademark Office patent files or records, but otherwise reserves all copyright rights whatsoever.FIELD OF THE INVENTION[0003]Various aspects of the present disclosure relate to the estimation of the rate or frequency and to the localization of similar patterns in quasi-periodic signals. More specifically, for example, the signals are not limi...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61B5/00A61B7/04
CPCA61B5/0205A61B7/04A61B5/0022A61B5/7246A61B5/7282A61B5/7405A61B5/742A61B7/003A61B5/7235A61B5/0002A61B5/024A61B5/0816G06F19/30A61B5/7203A61B5/7225G06F2218/10A61B5/72
Inventor SCHRIEFL, ANDREAS J.REINISCH, ANDREAS J.
Owner CSD LABS GMBH
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