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Conductivity and geometrical factors affecting volume measurements with an impedancimetric catheter

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Abstract

With a model based on Poisson’s equation, computations employing published data and measurements made in glass cylinders filled with saline, the influence of conductivity and geometry on the determination of volume was analysed with an impedancimetric catheter. Two distal electrodes inject a constant current while a set of central electrodes sense by sections the potential along the cylindrical chamber. It was concluded that each section ought to be independently calibrated, the distribution of the electrodes along the catheter and its relationship to the chamber radius being of paramount importance for a linear calibration. The ratio σ r , of the external medium conductivity σ e to the internal conductivity σ i influences drastically both the linearity and the calibration of each section. If a section volume is linearly related to the total chamber volume, that section admittance is a total volume estimator.

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Author notes

  1. J. C. Spinelli

    Present address: Instituto de Ingeniería Eléctrica (IIE), Facultad de Ciencias Exactas y Tecnologia (FACET, UNT), San Miguel de Tucumán, Argentina

  2. M. E. Valentinuzzi

    Present address: , C. C. 28 suc. 2, 4000, Tucuman, Argentina

Authors and Affiliations

  1. Bioingenieria, Instituto Superior de Investigaciones Biológicas (INSIBIO), Consejo Nacional de Investigaciones Cientificas y Técnicas (CONICET) and Universidad Nacional de Tucumán (UNT), San Miguel de Tucumán, Argentina

    J. C. Spinelli &  M. E. Valentinuzzi

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  1. J. C. Spinelli
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  2. M. E. Valentinuzzi
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Spinelli, J.C., Valentinuzzi, M.E. Conductivity and geometrical factors affecting volume measurements with an impedancimetric catheter. Med. Biol. Eng. Comput. 24, 460–464 (1986). https://doi.org/10.1007/BF02443959

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  • DOI: https://doi.org/10.1007/BF02443959

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