JAPANES JOURNAL OF MEDICAL INSTRUMENTATION
Online ISSN : 1881-4875
Print ISSN : 0385-440X
Volume 48, Issue 11
Displaying 1-14 of 14 articles from this issue
  • Article type: Cover
    1978 Volume 48 Issue 11 Pages Cover1-
    Published: November 01, 1978
    Released on J-STAGE: January 18, 2021
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  • Article type: Appendix
    1978 Volume 48 Issue 11 Pages App1-
    Published: November 01, 1978
    Released on J-STAGE: January 18, 2021
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  • Article type: Index
    1978 Volume 48 Issue 11 Pages Toc1-
    Published: November 01, 1978
    Released on J-STAGE: January 18, 2021
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  • Article type: Index
    1978 Volume 48 Issue 11 Pages Toc2-
    Published: November 01, 1978
    Released on J-STAGE: January 18, 2021
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  • [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
    Article type: Discussion Meeting
    1978 Volume 48 Issue 11 Pages 521-531
    Published: November 01, 1978
    Released on J-STAGE: January 18, 2021
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  • Shigekiyo FUJITA, Toshiaki YOSHIHISA
    Article type: Original Contribution
    1978 Volume 48 Issue 11 Pages 532-535
    Published: November 01, 1978
    Released on J-STAGE: January 18, 2021
    JOURNAL FREE ACCESS
    The usefulness of impedance measurement in the field of neurosurgery is already recognized as well as in the field of measuring pulmonary circulatory functions. In the present report, an instrument which was newly developed so as to be able to measure the cerebral impedance suitable for clinical use using both two and four electrode method was presented.The instrument has 50 KHz sine wave oscillator and 50 μA rms constant current circuit, the impedance is measured directly on the meter and also recorded on recorder by connecting to the isolated output terminals, and it has sound display circuit paralleled to the impedance value. This is operated by dry battery for safety in clinical usage. Calibration of impedance is possible in two electrode method.The measurement of impedance using this instrument in saline and animal brain showed four electrode method was much sensitive than two electrode method, although two electrode method has advantage over four electrode method in case of measuring deep cerebral structures because of less damage on brain tissue by its simpler electrode configuration. The instrument would be very suitable for clinical impedance measurement in neurosurgery as it is able to measure both two and four electrode method.
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  • Toshiko YUSA
    Article type: Original Contribution
    1978 Volume 48 Issue 11 Pages 536-548
    Published: November 01, 1978
    Released on J-STAGE: January 18, 2021
    JOURNAL FREE ACCESS
    34 arrangemets of bag(B), pop-off valve(P) and fresh gas inlet(F) location in the semi-closed circle system were tested to determine which arrangement best conserved fresh gas using N_2O as fresh gas at a given inflow rate under constnt ventilatory condition and the influence of the relative loation of B, P and F on the efficieney of fresh gas conservation was evaluated.The influences of inflow rate, tidal volume and respiratory rate under constnt minute volume wer also examined in the semi-closed system which has been most widely used in the present day practice.As the results of investigating data, the following facts were revealed;(1) The high efficiency of all the arrangements both during spontaneous and controlled respiration (S.R. and C.R.) was obtained when P was located in Seg. 1 (from the expiratory valve to the inspiratory valve close to the inspiratory valve) or Seg. 2 (from the expiratory valve to the inspiratory valve close to the expiratory valve) and F was located in Seg. 1 or immediately downstream from the inspiratory valve.(2) P was prefered to be located in Seg. 1 during S.R. and in Seg. 2 during C.R.(3) When P and F were located in Seg. 1 or Seg. 2 during S.R., if P, F and B were closely located each other, the efficiency was decreased greatly.(4) The low efficiency occurred when P and F were located in immediately downstream from the inspiratory valve with S.R. and closely located each other near the expiratory valve with C.R. (5) If the minute volume was constant, the change in tidal volume and respiratory rate had no effect on the efficiency.(6) The efficiency was directly related to inflow rate and increased in proprtion to inflow rate.From all the above results, the system represented by B_2B_2F_1(B and P were in Seg.2,F was in Seg. 1) was the best arrangement tested and this was consistent with the statements in the view point of CO_2 elimination efficiency.
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  • T. AGISHI
    Article type: Explanation
    1978 Volume 48 Issue 11 Pages 549-553
    Published: November 01, 1978
    Released on J-STAGE: January 18, 2021
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  • [in Japanese]
    Article type: Impressions
    1978 Volume 48 Issue 11 Pages 554-557
    Published: November 01, 1978
    Released on J-STAGE: January 18, 2021
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  • Article type: Technical Notes
    1978 Volume 48 Issue 11 Pages 558-561
    Published: November 01, 1978
    Released on J-STAGE: January 18, 2021
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  • Article type: Technical Notes
    1978 Volume 48 Issue 11 Pages 562-563
    Published: November 01, 1978
    Released on J-STAGE: January 18, 2021
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  • Article type: Appendix
    1978 Volume 48 Issue 11 Pages 564-
    Published: November 01, 1978
    Released on J-STAGE: January 18, 2021
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  • Article type: Appendix
    1978 Volume 48 Issue 11 Pages 565-
    Published: November 01, 1978
    Released on J-STAGE: January 18, 2021
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  • Article type: Cover
    1978 Volume 48 Issue 11 Pages A37-
    Published: November 01, 1978
    Released on J-STAGE: January 18, 2021
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