WO2004075738A3 - Method and apparatus for continuous electrode impedance monitoring - Google Patents

Method and apparatus for continuous electrode impedance monitoring Download PDF

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Publication number
WO2004075738A3
WO2004075738A3 PCT/US2004/006272 US2004006272W WO2004075738A3 WO 2004075738 A3 WO2004075738 A3 WO 2004075738A3 US 2004006272 W US2004006272 W US 2004006272W WO 2004075738 A3 WO2004075738 A3 WO 2004075738A3
Authority
WO
WIPO (PCT)
Prior art keywords
signal
filter
test
electrophysiological
low pass
Prior art date
Application number
PCT/US2004/006272
Other languages
French (fr)
Other versions
WO2004075738A2 (en
Inventor
Warwick Freeman
Philip Grosso
Richard Newman
Original Assignee
Compumedics Usa Inc
Warwick Freeman
Philip Grosso
Richard Newman
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 Compumedics Usa Inc, Warwick Freeman, Philip Grosso, Richard Newman filed Critical Compumedics Usa Inc
Priority to AU2004215917A priority Critical patent/AU2004215917B2/en
Publication of WO2004075738A2 publication Critical patent/WO2004075738A2/en
Priority to US11/205,373 priority patent/US8068905B2/en
Publication of WO2004075738A3 publication Critical patent/WO2004075738A3/en

Links

Classifications

    • 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
    • A61B5/6843—Monitoring or controlling sensor contact pressure
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/25—Bioelectric electrodes therefor
    • A61B5/276—Protection against electrode failure

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Medical Informatics (AREA)
  • Biophysics (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Physics & Mathematics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

In one embodiment, the present invention includes a test signal generator capable of producing an impedance test signal comprising of a sine wave having a known frequency. The test signal generator may include a crystal oscillator (12), a counter (14), and a lookup table (16). The lookup table (16) output is applied to a digital to analog converter (18) and is then low pass filtered using a conventional analog filter (20) to produce a sine wave of a known frequency and voltage amplitude. The test signal flows through the electrode and combines with an electrophysiological signal to form a combined signal. A signal processor (30) is used to isolate the combined signal into the test signal component and the electrophysiological component. The signal processor (30) digitally low pass filters the combined signal and the output of the low pass filter is the electrophysiological signal. The signal processor (30) then digitally bandpass filters the combined signal using a filter with a center frequency which is the same as the test frequency. The output of this filter is then used to calculate the electrode impedance.
PCT/US2004/006272 2003-02-26 2004-02-26 Method and apparatus for continuous electrode impedance monitoring WO2004075738A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2004215917A AU2004215917B2 (en) 2003-02-26 2004-02-26 Method and apparatus for continuous electrode impedance monitoring
US11/205,373 US8068905B2 (en) 2004-02-26 2005-08-17 Method and apparatus for continuous electrode impedance monitoring

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US45113003P 2003-02-26 2003-02-26
US60/451,130 2003-02-26

Publications (2)

Publication Number Publication Date
WO2004075738A2 WO2004075738A2 (en) 2004-09-10
WO2004075738A3 true WO2004075738A3 (en) 2005-11-03

Family

ID=32927701

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2004/006272 WO2004075738A2 (en) 2003-02-26 2004-02-26 Method and apparatus for continuous electrode impedance monitoring

Country Status (2)

Country Link
AU (1) AU2004215917B2 (en)
WO (1) WO2004075738A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9594104B2 (en) 2014-10-22 2017-03-14 Natus Medical Incorporated Simultaneous impedance testing method and apparatus

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7684856B2 (en) 2005-12-12 2010-03-23 General Electric Company Detection of artifacts in bioelectric signals
FR2908973A1 (en) * 2006-11-24 2008-05-30 Yves Faisandier Electrical physiological signal i.e. ECG signal, recording method for ambulatory apparatus, involves associating impedance measurement of electrodes with amplification and digitization of signal to provide signals charged with information
US10278602B2 (en) 2016-06-22 2019-05-07 General Electric Company System and method for rapid ECG acquisition
US10492704B2 (en) * 2017-08-29 2019-12-03 Biosense Webster (Israel) Ltd. Medical patch for simultaneously sensing ECG signals and impedance-indicative electrical signals

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4993423A (en) * 1988-07-13 1991-02-19 Physio-Control Corporation Method and apparatus for differential lead impedance comparison
US5042498A (en) * 1990-04-06 1991-08-27 Hewlett-Packard Company Intelligent electrocardiogram system
US6007532A (en) * 1997-08-29 1999-12-28 3M Innovative Properties Company Method and apparatus for detecting loss of contact of biomedical electrodes with patient skin

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4610254A (en) * 1984-03-08 1986-09-09 Physio-Control Corporation Interactive portable defibrillator
US6487449B1 (en) * 2000-05-23 2002-11-26 Ge Medical Systems Information Technologies, Inc. Method and apparatus for reducing noise and detecting electrode faults in medical equipment

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4993423A (en) * 1988-07-13 1991-02-19 Physio-Control Corporation Method and apparatus for differential lead impedance comparison
US5042498A (en) * 1990-04-06 1991-08-27 Hewlett-Packard Company Intelligent electrocardiogram system
US6007532A (en) * 1997-08-29 1999-12-28 3M Innovative Properties Company Method and apparatus for detecting loss of contact of biomedical electrodes with patient skin

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9594104B2 (en) 2014-10-22 2017-03-14 Natus Medical Incorporated Simultaneous impedance testing method and apparatus

Also Published As

Publication number Publication date
AU2004215917A1 (en) 2004-09-10
AU2004215917B2 (en) 2008-01-10
WO2004075738A2 (en) 2004-09-10

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