CA2231038A1 - Electrical impedance method and apparatus for detecting and diagnosing diseases - Google Patents

Electrical impedance method and apparatus for detecting and diagnosing diseases Download PDF

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Publication number
CA2231038A1
CA2231038A1 CA 2231038 CA2231038A CA2231038A1 CA 2231038 A1 CA2231038 A1 CA 2231038A1 CA 2231038 CA2231038 CA 2231038 CA 2231038 A CA2231038 A CA 2231038A CA 2231038 A1 CA2231038 A1 CA 2231038A1
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Canada
Prior art keywords
data
impedance
electrical impedance
detecting
analyzed
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Legal status (The legal status 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 status listed.)
Granted
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CA 2231038
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French (fr)
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CA2231038C (en
Inventor
Leslie W. Organ
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Impedimed Ltd
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Individual
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Priority to CA 2231038 priority Critical patent/CA2231038C/en
Priority to CA2492903A priority patent/CA2492903C/en
Publication of CA2231038A1 publication Critical patent/CA2231038A1/en
Application granted granted Critical
Publication of CA2231038C publication Critical patent/CA2231038C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves 
    • A61B5/053—Measuring electrical impedance or conductance of a portion of the body
    • A61B5/0536—Impedance imaging, e.g. by tomography

Abstract

A method and apparatus for screening, sensing, or diagnosing disease states by obtaining a plurality of electrical impedance data measurements in organized patterns from two anatomically homologous body regions, one of which may be affected by disease. One subset of the data so obtained is processed, compared and analyzed by structuring the data values as elements of n × n impedance matrix, and characterizing these matrices by their eigenvalues and eigenvectors. Another, not entirely exclusive subset of the data is alternatively processed, compared and analyzed by plotting the impedance data as chords of two circles representing the two homologous body regions. Impedance chord plots provide a visual indication of certain disease states and their location.
CA 2231038 1998-05-01 1998-05-05 Electrical impedance method and apparatus for detecting and diagnosing diseases Expired - Lifetime CA2231038C (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA 2231038 CA2231038C (en) 1998-05-05 1998-05-05 Electrical impedance method and apparatus for detecting and diagnosing diseases
CA2492903A CA2492903C (en) 1998-05-01 1998-05-05 Electrical impedance method and apparatus for detecting and diagnosing diseases

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA 2231038 CA2231038C (en) 1998-05-05 1998-05-05 Electrical impedance method and apparatus for detecting and diagnosing diseases

Related Child Applications (1)

Application Number Title Priority Date Filing Date
CA2492903A Division CA2492903C (en) 1998-05-01 1998-05-05 Electrical impedance method and apparatus for detecting and diagnosing diseases

Publications (2)

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CA2231038A1 true CA2231038A1 (en) 1999-11-05
CA2231038C CA2231038C (en) 2005-12-13

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ID=29409379

Family Applications (1)

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CA 2231038 Expired - Lifetime CA2231038C (en) 1998-05-01 1998-05-05 Electrical impedance method and apparatus for detecting and diagnosing diseases

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001067098A1 (en) * 2000-03-03 2001-09-13 Btg International Limited Electrical impedance measuring method for differentiating tissue types
US6768921B2 (en) 2000-12-28 2004-07-27 Z-Tech (Canada) Inc. Electrical impedance method and apparatus for detecting and diagnosing diseases
US8103337B2 (en) 2004-11-26 2012-01-24 Impedimed Limited Weighted gradient method and system for diagnosing disease
US8233974B2 (en) 1999-06-22 2012-07-31 Impedimed Limited Method and device for measuring tissue oedema
US8761870B2 (en) 2006-05-30 2014-06-24 Impedimed Limited Impedance measurements
US9504406B2 (en) 2006-11-30 2016-11-29 Impedimed Limited Measurement apparatus
US9615766B2 (en) 2008-11-28 2017-04-11 Impedimed Limited Impedance measurement process
US9615767B2 (en) 2009-10-26 2017-04-11 Impedimed Limited Fluid level indicator determination
US9724012B2 (en) 2005-10-11 2017-08-08 Impedimed Limited Hydration status monitoring
US10307074B2 (en) 2007-04-20 2019-06-04 Impedimed Limited Monitoring system and probe
US11660013B2 (en) 2005-07-01 2023-05-30 Impedimed Limited Monitoring system
US11737678B2 (en) 2005-07-01 2023-08-29 Impedimed Limited Monitoring system

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4848369B2 (en) 2004-06-18 2011-12-28 インぺディメッド リミテッド Apparatus and method for operating edema detection
EP1912563B1 (en) 2005-08-02 2016-04-20 Impedimed Limited Impedance parameter values
ES2543967T3 (en) 2007-01-15 2015-08-26 Impedimed Limited Method for performing impedance measurements on a subject
JP5101685B2 (en) 2007-03-30 2012-12-19 インぺディメッド リミテッド Operation protection circuit for variably controlling the compensation level to reduce the load of resistive and capacitive signals
EP2211714B1 (en) 2007-11-05 2016-11-23 Impedimed Limited Impedance determination
AU2008207672B2 (en) 2008-02-15 2013-10-31 Impedimed Limited Impedance Analysis
EP2501283B1 (en) 2009-11-18 2016-09-21 Impedimed Limited Signal distribution for patient-electrode measurements

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8233974B2 (en) 1999-06-22 2012-07-31 Impedimed Limited Method and device for measuring tissue oedema
WO2001067098A1 (en) * 2000-03-03 2001-09-13 Btg International Limited Electrical impedance measuring method for differentiating tissue types
US6768921B2 (en) 2000-12-28 2004-07-27 Z-Tech (Canada) Inc. Electrical impedance method and apparatus for detecting and diagnosing diseases
US8103337B2 (en) 2004-11-26 2012-01-24 Impedimed Limited Weighted gradient method and system for diagnosing disease
US11737678B2 (en) 2005-07-01 2023-08-29 Impedimed Limited Monitoring system
US11660013B2 (en) 2005-07-01 2023-05-30 Impedimed Limited Monitoring system
US11612332B2 (en) 2005-10-11 2023-03-28 Impedimed Limited Hydration status monitoring
US9724012B2 (en) 2005-10-11 2017-08-08 Impedimed Limited Hydration status monitoring
US8761870B2 (en) 2006-05-30 2014-06-24 Impedimed Limited Impedance measurements
US9504406B2 (en) 2006-11-30 2016-11-29 Impedimed Limited Measurement apparatus
US10307074B2 (en) 2007-04-20 2019-06-04 Impedimed Limited Monitoring system and probe
US9615766B2 (en) 2008-11-28 2017-04-11 Impedimed Limited Impedance measurement process
US9615767B2 (en) 2009-10-26 2017-04-11 Impedimed Limited Fluid level indicator determination

Also Published As

Publication number Publication date
CA2231038C (en) 2005-12-13

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