WO2005020789A3 - Cepstral domain pulse oximetry - Google Patents

Cepstral domain pulse oximetry Download PDF

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Publication number
WO2005020789A3
WO2005020789A3 PCT/US2004/026831 US2004026831W WO2005020789A3 WO 2005020789 A3 WO2005020789 A3 WO 2005020789A3 US 2004026831 W US2004026831 W US 2004026831W WO 2005020789 A3 WO2005020789 A3 WO 2005020789A3
Authority
WO
WIPO (PCT)
Prior art keywords
plethysmographic signals
domain plethysmographic
time domain
cepstral
spectrums
Prior art date
Application number
PCT/US2004/026831
Other languages
French (fr)
Other versions
WO2005020789A2 (en
Inventor
Alvin Mark Terry
Original Assignee
Datex Ohmeda Inc
Alvin Mark Terry
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Datex Ohmeda Inc, Alvin Mark Terry filed Critical Datex Ohmeda Inc
Publication of WO2005020789A2 publication Critical patent/WO2005020789A2/en
Publication of WO2005020789A3 publication Critical patent/WO2005020789A3/en

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
    • A61B5/1455—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters
    • A61B5/14551—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters for measuring blood gases
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
    • A61B5/024—Detecting, measuring or recording pulse rate or heart rate
    • A61B5/02416—Detecting, measuring or recording pulse rate or heart rate using photoplethysmograph signals, e.g. generated by infrared radiation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/6813—Specially adapted to be attached to a specific body part
    • A61B5/6825—Hand
    • A61B5/6826—Finger
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/683—Means for maintaining contact with the body
    • A61B5/6838—Clamps or clips
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
    • A61B5/7235—Details of waveform analysis
    • A61B5/7253—Details of waveform analysis characterised by using transforms
    • A61B5/7257—Details of waveform analysis characterised by using transforms using Fourier transforms
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
    • A61B5/7203—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal
    • A61B5/7207—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal of noise induced by motion artifacts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
    • A61B5/7235—Details of waveform analysis
    • A61B5/7239—Details of waveform analysis using differentiation including higher order derivatives

Abstract

Processing of plethysmographic signals via the cepstral domain is provided. In one embodiment, a cepstral domain plethysmographic signal processing method (200) includes the steps of obtaining (210) time domain plethysmographic signals, smoothing (220) the time domain plethysmographic signals, performing (230) a first-stage Fourier transformation of the time domain plethysmographic signals to frequency domain plethysmographic signals, computing (240) power spectrums from the frequency domain plethysmographic signals, scaling (250) the power spectrums and performing (260) a second-stage Fourier transformation on the log-scaled spectrums to transform the power spectrums into cepstrums, and examining (270) the cepstrums to obtain information therefrom relating to a physiological condition of the patient such as the patient's pulse rate or SPO2 level.
PCT/US2004/026831 2003-08-21 2004-08-17 Cepstral domain pulse oximetry WO2005020789A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/645,046 2003-08-21
US10/645,046 US20040039273A1 (en) 2002-02-22 2003-08-21 Cepstral domain pulse oximetry

Publications (2)

Publication Number Publication Date
WO2005020789A2 WO2005020789A2 (en) 2005-03-10
WO2005020789A3 true WO2005020789A3 (en) 2005-12-22

Family

ID=34273277

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2004/026831 WO2005020789A2 (en) 2003-08-21 2004-08-17 Cepstral domain pulse oximetry

Country Status (2)

Country Link
US (1) US20040039273A1 (en)
WO (1) WO2005020789A2 (en)

Families Citing this family (96)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6675031B1 (en) 1999-04-14 2004-01-06 Mallinckrodt Inc. Method and circuit for indicating quality and accuracy of physiological measurements
US7190986B1 (en) 2002-10-18 2007-03-13 Nellcor Puritan Bennett Inc. Non-adhesive oximeter sensor for sensitive skin
US7194293B2 (en) * 2004-03-08 2007-03-20 Nellcor Puritan Bennett Incorporated Selection of ensemble averaging weights for a pulse oximeter based on signal quality metrics
EP1611847A1 (en) * 2004-06-28 2006-01-04 Datex-Ohmeda, Inc. Validating pulse oximetry signals in the potential presence of artifact
US8116839B1 (en) 2005-02-25 2012-02-14 General Electric Company System for detecting potential probe malfunction conditions in a pulse oximeter
ATE450198T1 (en) * 2005-03-14 2009-12-15 Koninkl Philips Electronics Nv METHOD AND DEVICE FOR DETERMINING BLOOD CIRCULATION IN A BODY ELEMENT
ES2276594B1 (en) * 2005-06-13 2008-06-16 Consejo Superior Investig. Cientificas METHOD FOR PROCESSING PHOTOPLETISMOGRAPHIC SIGNS OBTAINED FROM A PERSON OR ANIMAL, AND OXIMETER THAT USES SUCH METHOD.
US7403806B2 (en) 2005-06-28 2008-07-22 General Electric Company System for prefiltering a plethysmographic signal
US7515949B2 (en) * 2005-06-29 2009-04-07 General Electric Company Wavelet transform of a plethysmographic signal
GB2428153A (en) * 2005-07-08 2007-01-17 Sharp Kk Interactive multiple view display
US7657294B2 (en) 2005-08-08 2010-02-02 Nellcor Puritan Bennett Llc Compliant diaphragm medical sensor and technique for using the same
US7590439B2 (en) 2005-08-08 2009-09-15 Nellcor Puritan Bennett Llc Bi-stable medical sensor and technique for using the same
US7657295B2 (en) 2005-08-08 2010-02-02 Nellcor Puritan Bennett Llc Medical sensor and technique for using the same
US20070060808A1 (en) 2005-09-12 2007-03-15 Carine Hoarau Medical sensor for reducing motion artifacts and technique for using the same
US7725147B2 (en) 2005-09-29 2010-05-25 Nellcor Puritan Bennett Llc System and method for removing artifacts from waveforms
US7904130B2 (en) 2005-09-29 2011-03-08 Nellcor Puritan Bennett Llc Medical sensor and technique for using the same
US7899510B2 (en) 2005-09-29 2011-03-01 Nellcor Puritan Bennett Llc Medical sensor and technique for using the same
US8092379B2 (en) 2005-09-29 2012-01-10 Nellcor Puritan Bennett Llc Method and system for determining when to reposition a physiological sensor
US7869850B2 (en) 2005-09-29 2011-01-11 Nellcor Puritan Bennett Llc Medical sensor for reducing motion artifacts and technique for using the same
US8233954B2 (en) 2005-09-30 2012-07-31 Nellcor Puritan Bennett Llc Mucosal sensor for the assessment of tissue and blood constituents and technique for using the same
US8062221B2 (en) 2005-09-30 2011-11-22 Nellcor Puritan Bennett Llc Sensor for tissue gas detection and technique for using the same
US7486979B2 (en) 2005-09-30 2009-02-03 Nellcor Puritan Bennett Llc Optically aligned pulse oximetry sensor and technique for using the same
US7881762B2 (en) 2005-09-30 2011-02-01 Nellcor Puritan Bennett Llc Clip-style medical sensor and technique for using the same
US7555327B2 (en) 2005-09-30 2009-06-30 Nellcor Puritan Bennett Llc Folding medical sensor and technique for using the same
US7483731B2 (en) 2005-09-30 2009-01-27 Nellcor Puritan Bennett Llc Medical sensor and technique for using the same
EP1983894A2 (en) * 2006-02-09 2008-10-29 Koninklijke Philips Electronics N.V. Assessment of attention span or lapse thereof
US8073518B2 (en) 2006-05-02 2011-12-06 Nellcor Puritan Bennett Llc Clip-style medical sensor and technique for using the same
US8145288B2 (en) 2006-08-22 2012-03-27 Nellcor Puritan Bennett Llc Medical sensor for reducing signal artifacts and technique for using the same
US8219170B2 (en) 2006-09-20 2012-07-10 Nellcor Puritan Bennett Llc System and method for practicing spectrophotometry using light emitting nanostructure devices
US8396527B2 (en) 2006-09-22 2013-03-12 Covidien Lp Medical sensor for reducing signal artifacts and technique for using the same
US8175671B2 (en) 2006-09-22 2012-05-08 Nellcor Puritan Bennett Llc Medical sensor for reducing signal artifacts and technique for using the same
US8195264B2 (en) 2006-09-22 2012-06-05 Nellcor Puritan Bennett Llc Medical sensor for reducing signal artifacts and technique for using the same
US7869849B2 (en) 2006-09-26 2011-01-11 Nellcor Puritan Bennett Llc Opaque, electrically nonconductive region on a medical sensor
US7574245B2 (en) 2006-09-27 2009-08-11 Nellcor Puritan Bennett Llc Flexible medical sensor enclosure
US7796403B2 (en) 2006-09-28 2010-09-14 Nellcor Puritan Bennett Llc Means for mechanical registration and mechanical-electrical coupling of a faraday shield to a photodetector and an electrical circuit
US7890153B2 (en) 2006-09-28 2011-02-15 Nellcor Puritan Bennett Llc System and method for mitigating interference in pulse oximetry
US8175667B2 (en) 2006-09-29 2012-05-08 Nellcor Puritan Bennett Llc Symmetric LED array for pulse oximetry
US7476131B2 (en) 2006-09-29 2009-01-13 Nellcor Puritan Bennett Llc Device for reducing crosstalk
US7684842B2 (en) 2006-09-29 2010-03-23 Nellcor Puritan Bennett Llc System and method for preventing sensor misuse
US7680522B2 (en) 2006-09-29 2010-03-16 Nellcor Puritan Bennett Llc Method and apparatus for detecting misapplied sensors
US8068891B2 (en) 2006-09-29 2011-11-29 Nellcor Puritan Bennett Llc Symmetric LED array for pulse oximetry
EP2096994B1 (en) 2006-12-09 2018-10-03 Masimo Corporation Plethysmograph variability determination
US8265724B2 (en) 2007-03-09 2012-09-11 Nellcor Puritan Bennett Llc Cancellation of light shunting
US7894869B2 (en) 2007-03-09 2011-02-22 Nellcor Puritan Bennett Llc Multiple configuration medical sensor and technique for using the same
US8280469B2 (en) 2007-03-09 2012-10-02 Nellcor Puritan Bennett Llc Method for detection of aberrant tissue spectra
US8346328B2 (en) 2007-12-21 2013-01-01 Covidien Lp Medical sensor and technique for using the same
US8352004B2 (en) 2007-12-21 2013-01-08 Covidien Lp Medical sensor and technique for using the same
US8366613B2 (en) 2007-12-26 2013-02-05 Covidien Lp LED drive circuit for pulse oximetry and method for using same
US8577434B2 (en) 2007-12-27 2013-11-05 Covidien Lp Coaxial LED light sources
US8452364B2 (en) 2007-12-28 2013-05-28 Covidien LLP System and method for attaching a sensor to a patient's skin
US8442608B2 (en) 2007-12-28 2013-05-14 Covidien Lp System and method for estimating physiological parameters by deconvolving artifacts
US20090171173A1 (en) * 2007-12-31 2009-07-02 Nellcor Puritan Bennett Llc System and method for reducing motion artifacts in a sensor
US8070508B2 (en) 2007-12-31 2011-12-06 Nellcor Puritan Bennett Llc Method and apparatus for aligning and securing a cable strain relief
US20090171171A1 (en) * 2007-12-31 2009-07-02 Nellcor Puritan Bennett Llc Oximetry sensor overmolding location features
US8199007B2 (en) 2007-12-31 2012-06-12 Nellcor Puritan Bennett Llc Flex circuit snap track for a biometric sensor
US8897850B2 (en) 2007-12-31 2014-11-25 Covidien Lp Sensor with integrated living hinge and spring
US8092993B2 (en) 2007-12-31 2012-01-10 Nellcor Puritan Bennett Llc Hydrogel thin film for use as a biosensor
US8437822B2 (en) 2008-03-28 2013-05-07 Covidien Lp System and method for estimating blood analyte concentration
US8112375B2 (en) 2008-03-31 2012-02-07 Nellcor Puritan Bennett Llc Wavelength selection and outlier detection in reduced rank linear models
US7880884B2 (en) 2008-06-30 2011-02-01 Nellcor Puritan Bennett Llc System and method for coating and shielding electronic sensor components
US8071935B2 (en) 2008-06-30 2011-12-06 Nellcor Puritan Bennett Llc Optical detector with an overmolded faraday shield
US7887345B2 (en) 2008-06-30 2011-02-15 Nellcor Puritan Bennett Llc Single use connector for pulse oximetry sensors
US8364220B2 (en) 2008-09-25 2013-01-29 Covidien Lp Medical sensor and technique for using the same
US8417309B2 (en) 2008-09-30 2013-04-09 Covidien Lp Medical sensor
US8914088B2 (en) 2008-09-30 2014-12-16 Covidien Lp Medical sensor and technique for using the same
US8423112B2 (en) 2008-09-30 2013-04-16 Covidien Lp Medical sensor and technique for using the same
WO2010068713A2 (en) * 2008-12-09 2010-06-17 Starr Life Sciences Corp. Noninvasive photoplethysmographic sensor measurements of awake animals
US8452366B2 (en) 2009-03-16 2013-05-28 Covidien Lp Medical monitoring device with flexible circuitry
US8221319B2 (en) 2009-03-25 2012-07-17 Nellcor Puritan Bennett Llc Medical device for assessing intravascular blood volume and technique for using the same
US8509869B2 (en) 2009-05-15 2013-08-13 Covidien Lp Method and apparatus for detecting and analyzing variations in a physiologic parameter
US8634891B2 (en) 2009-05-20 2014-01-21 Covidien Lp Method and system for self regulation of sensor component contact pressure
US8505821B2 (en) 2009-06-30 2013-08-13 Covidien Lp System and method for providing sensor quality assurance
US8311601B2 (en) 2009-06-30 2012-11-13 Nellcor Puritan Bennett Llc Reflectance and/or transmissive pulse oximeter
US9010634B2 (en) 2009-06-30 2015-04-21 Covidien Lp System and method for linking patient data to a patient and providing sensor quality assurance
US8290730B2 (en) * 2009-06-30 2012-10-16 Nellcor Puritan Bennett Ireland Systems and methods for assessing measurements in physiological monitoring devices
US8636667B2 (en) * 2009-07-06 2014-01-28 Nellcor Puritan Bennett Ireland Systems and methods for processing physiological signals in wavelet space
US8391941B2 (en) 2009-07-17 2013-03-05 Covidien Lp System and method for memory switching for multiple configuration medical sensor
US8417310B2 (en) 2009-08-10 2013-04-09 Covidien Lp Digital switching in multi-site sensor
US8428675B2 (en) 2009-08-19 2013-04-23 Covidien Lp Nanofiber adhesives used in medical devices
US8840562B2 (en) * 2009-09-24 2014-09-23 Covidien Lp Signal processing warping technique
US9307928B1 (en) 2010-03-30 2016-04-12 Masimo Corporation Plethysmographic respiration processor
US9002440B2 (en) * 2010-07-08 2015-04-07 Intelomed, Inc. System and method for characterizing circulatory blood flow
WO2012006520A1 (en) 2010-07-08 2012-01-12 Intelomed, Inc. System and method for characterizing circulatory blood flow
US8571622B2 (en) * 2010-08-31 2013-10-29 General Electric Company Method for reducing power consumption in pulse oximeter systems, pulse oximeter system and pulse oximeter sensor
GB2488316A (en) * 2011-02-22 2012-08-29 Toumaz Uk Ltd Method for determining respiration rate from uncorrupted signal segments
JP5716466B2 (en) * 2011-03-10 2015-05-13 セイコーエプソン株式会社 Filter device and pulsation detection device
US8880155B2 (en) 2012-02-24 2014-11-04 Covidien Lp Hypovolemia diagnosis technique
AU2014274953A1 (en) 2013-06-04 2016-01-21 Intelomed, Inc Hemodynamic risk severity based upon detection and quantification of cardiac dysrhythmia behavior using a pulse volume waveform
AU2014278194A1 (en) 2013-06-11 2016-02-04 Intelomed, Inc Predicting hypovolemic hypotensive conditions using a pulse volume waveform
AU2014306776A1 (en) 2013-08-12 2016-03-03 Intelomed, Inc. Methods for monitoring and analyzing cardiovascular states
EP2960862B1 (en) * 2014-06-24 2017-03-22 Vicarious Perception Technologies B.V. A method for stabilizing vital sign measurements using parametric facial appearance models via remote sensors
DE102014225483B3 (en) * 2014-12-10 2016-05-04 Gert Küchler Method and device for determining at least one physiological parameter
AU2016323049B2 (en) 2015-09-14 2021-06-24 Whoop, Inc. Physiological signal monitoring
US10321831B2 (en) * 2015-11-25 2019-06-18 Texas Instruments Incorporated Heart rate estimation apparatus with state sequence optimization
CN108294738A (en) * 2018-03-06 2018-07-20 江苏康尚生物医疗科技有限公司 A kind of blood oxygen solution in frequency domain measurement method, equipment and storage medium
CN112869716B (en) * 2021-02-23 2022-04-15 佛山科学技术学院 Pulse feature identification system and method based on two-channel convolutional neural network

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6002952A (en) * 1997-04-14 1999-12-14 Masimo Corporation Signal processing apparatus and method

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3566035A (en) * 1969-07-17 1971-02-23 Bell Telephone Labor Inc Real time cepstrum analyzer
JPS60116345A (en) * 1983-11-30 1985-06-22 富士通株式会社 Ultrasonic diagnostic apparatus
US4911167A (en) * 1985-06-07 1990-03-27 Nellcor Incorporated Method and apparatus for detecting optical pulses
US5934277A (en) * 1991-09-03 1999-08-10 Datex-Ohmeda, Inc. System for pulse oximetry SpO2 determination
US5327893A (en) * 1992-10-19 1994-07-12 Rensselaer Polytechnic Institute Detection of cholesterol deposits in arteries
JP3464697B2 (en) * 1993-12-21 2003-11-10 興和株式会社 Oxygen saturation meter
JP2812184B2 (en) * 1994-02-23 1998-10-22 日本電気株式会社 Complex Cepstrum Analyzer for Speech
US5575984A (en) * 1994-06-09 1996-11-19 Abb Environmental Systems, Div. Of Abb Flakt, Inc. Method for preparing calcium carbonate for scrubbing sulfur oxides from combustion effluents
DE19506484C2 (en) * 1995-02-24 1999-09-16 Stiftung Fuer Lasertechnologie Method and device for selective non-invasive laser myography (LMG)
US5766127A (en) * 1996-04-15 1998-06-16 Ohmeda Inc. Method and apparatus for improved photoplethysmographic perfusion-index monitoring
US6390986B1 (en) * 1999-05-27 2002-05-21 Rutgers, The State University Of New Jersey Classification of heart rate variability patterns in diabetics using cepstral analysis
KR100316023B1 (en) * 1999-11-01 2001-12-12 박종섭 Analog-digital mixed type delay locked loop combining voltage controlled oscillator and shift register type delay locked loop

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6002952A (en) * 1997-04-14 1999-12-14 Masimo Corporation Signal processing apparatus and method

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WO2005020789A2 (en) 2005-03-10

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