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New probe for measurement of related values of cross-sectional area and pressure in a biological tube

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Abstract

A probe for measurement of related values of cross-sectional area (CA) and pressure in a biological tube has been developed to study passive and active closure forces in the female urethra. CA is measured in the range 0·13–1·00 cm2 by the field gradient technique. The system is able to produce an arbitrarily chosen CA in the urethra in about 50 ms. Pressure is measured in the range 0–150 cm H2O (0–14·7 kPa) by a microtransducer. The risetime of the pressure measuring system is 2·5 ms. Pressure needed for inflation and deflation of the balloon ranges from 2 to −5 cm H2O (0·2 to −0·5 kPa). The hysteresis of the balloon is approximately 1 cm H2O (0·1 kPa). The method permits estimation of urethral distensibility (rigidity/compliance), the real (noninstrumented) urethral closure pressure and urethral hysteresis. Furthermore, evaluation of the urethral closure function in terms of isometric contraction, isotonic contraction, muscular work and power can be performed.

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Authors and Affiliations

  1. Department of Surgery D, Section of Urology, Rigshospitalet, University of Copenhagen, Blegdamsvej 9, 2100, Copenhagen Ø, Denmark

    G. Lose, H. Colstrup, K. Saksager & J. K. Kristensen

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  1. G. Lose
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  2. H. Colstrup
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  3. K. Saksager
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  4. J. K. Kristensen
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Lose, G., Colstrup, H., Saksager, K. et al. New probe for measurement of related values of cross-sectional area and pressure in a biological tube. Med. Biol. Eng. Comput. 24, 488–492 (1986). https://doi.org/10.1007/BF02443964

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  • DOI: https://doi.org/10.1007/BF02443964

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