Surgery – Diagnostic testing – Measuring electrical impedance or conductance of body portion
Reexamination Certificate
2011-06-28
2011-06-28
Hindenburg, Max (Department: 3736)
Surgery
Diagnostic testing
Measuring electrical impedance or conductance of body portion
Reexamination Certificate
active
07970461
ABSTRACT:
In one method, one or more excitation signals with the same or different frequencies are applied to a biological object such as a tissue, simultaneously or consequently. Response signals are then cross-correlated with delayed excitation signals. Cross-correlation products are then auto-correlated. Cross-correlation products correspond to conditions of the tissue and auto-correlation product corresponds to changes in the conditions. Measuring electrical characteristics at low, intermediate and high frequency is also disclosed. At low frequency, the current flows mostly through the extracellular liquid of tissue. At high frequency, the current passes through the cell membranes freely enough to dominate the overall impedance. At both frequencies, the delay is less than 1/30 of the period of the respective signal. The intermediate frequency between the low frequency and the high frequency carries information about quick changes in the condition of the tissue. The delay in one example is from about 1/30 to ¼ of the period of the intermediate signal.
REFERENCES:
patent: 3316896 (1967-05-01), Thomasset
patent: 3382428 (1968-05-01), Sherwood et al.
patent: 3696808 (1972-10-01), Roy et al.
patent: 4844086 (1989-07-01), Duffy
patent: 5280429 (1994-01-01), Withers
patent: 5282840 (1994-02-01), Hudrlik
patent: 5807272 (1998-09-01), Kun et al.
patent: 5941820 (1999-08-01), Zimmerman
patent: 5957861 (1999-09-01), Combs et al.
patent: 6151523 (2000-11-01), Rosell Ferrer et al.
patent: 6473640 (2002-10-01), Erlebacher
patent: 6496725 (2002-12-01), Kamada et al.
patent: 6532384 (2003-03-01), Fukuda
patent: 6760617 (2004-07-01), Ward et al.
patent: 6970738 (2005-11-01), Othman et al.
patent: 7122012 (2006-10-01), Bouton et al.
patent: 2001/0051774 (2001-12-01), Littrup et al.
patent: 2003/0216661 (2003-11-01), Davies
patent: 2004/0172080 (2004-09-01), Stadler et al.
patent: 2005/0090758 (2005-04-01), Parsonnet et al.
patent: 2225160 (2002-10-01), None
patent: 2242165 (2004-12-01), None
patent: WO 00/79255 (2000-12-01), None
patent: WO 01/19426 (2001-03-01), None
patent: WO 2004/045406 (2004-06-01), None
patent: WO 2004/050178 (2004-06-01), None
patent: WO 2004/052198 (2004-06-01), None
Kink, Andres et al., “Bioimpedance Based Analysis of Tissue Oedema”, Proc. of the XII Internat. Conf. on Electrical Bioimpedance & the V. Conf. on Electrical Impedance Tomography ICEBI/EIT 2004, Jun. 20-24, 2004, vol. 1, pp. 29-32, Gdansk, Poland.
Grimnes, Sverre et al., “Bioimpedance and Bioelectricity Basics”, 2000, pp. 99-101,114-118, 188-192, 282-284, Academic Press, San Diego, California.
Thiel, F. et al., “Semiparallel, Multi-Frequency Equipment for Electrical Bio-Impedance Measurements”, Proceedings of the XI International Conference on Electrical Bio-Impedance XI ICEBI2001, Jun. 17-21, 2001, pp. 225-228, Oslo, Norway.
Osypka, M. et al., “Parallel Signal Processing and Multi-Electrode Current Feeding in a Multi-Frequency EIT-System”, Innov. Tech. Biol. Med., 1994, pp. 57-61, vol. 15, No. 1.
Min, Mart et al., “Electrical Impedance and Cardiac Monitoring Technology, Potential and Application”, International Journal of Bioelectromagnetism, 2003, vol. 5, No. 1, pp. 53-56.
Gersing, Eberhard, “Impedance spectroscopy on living tissue for determination of the state of organs”, Bioelectrochemistry and Bioenergetics 45, 1998, pp. 145-149, Elsevier Science S.A.
Gheorghiu, Mihaela et al., “On the Quantitative Elevation of the Time Course of Tissue Impedance During Ischemia”, Proceedings of the XI International Conference on Electrical Bio-Impedance, XI ICEBI2001, Jun. 17-21, 2001, pp. 49-53, Olso, Norway.
Howie, Michael, et al., “An Evaluation of a New Two-Electrode Myocardial Electrical Impedance Monitor for Detecting Myocardial Ischemia”, Anesth Analg, 2001, 92, pp. 12-18, International Anesthesia Research Society.
Min, Mart et al., “Improvement of the vector analyser based on two-phase switching mode synchronous detection”, Measurement, 1996, pp. 103-111, vol. 19, No. 2, Elsevier Science Ltd, The Netherlands.
Burdett, Richard, “183: Correlators in Signal Extraction” Handbook of Measuring System Design, 2005, vol. 3, pp. 1217-1219, John Wiley & Sons Ltd, England.
Schafer, M. et al., “Monitoring of Physiological Process in Ischemic Heart Muscle by Using a New Tissue Model for Description of the Passive Electrical Impedance Spectra”, Proceedings of the XI International Conference on Electrical Bio-Impedance ICEBI2001, Jun. 17-21, 2001, pp. 55-58, Olso, Norway.
Min, Mart et al., “Lock-in measurement of bio-impedance variations”, Measurement 27, 2000, pp. 21-28, Elsevier Science Ltd.
Casas, O. et al., “In Vivo and In Situ Ischemic Tissue Characterization Using Electrical Impedance Spectroscopy”, Annals of the New York Academy of Sciences, 1999, vol. 873, pp. 51-58, The New York Academy of Sciences, New York, New York.
Gheorghiu, Mihaela et al., “Quantitative Analysis of Impedance Spectra of Organs during Ischemia”, Annals of the New York Academy of Sciences, 1999, vol. 873, pp. 65-71, The New York Academy of Sciences, New York, New York.
Schafer, M. et al., “Dielectric Properties of Skeletal Muscle during Ischemia in the Frequency Range from 50 Hz to 200 MHz”, Annals of the New York Academy of Sciences, 1999, vol. 873, pp. 59-64, The New York Academy of Sciences, New York, New York.
Kink Andres
Min Mart
Parve Toomas
Ratsep Indrek
Hindenburg Max
Towa Rene
Vern Maine & Associates
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