Japanese Journal of Extra-Corporeal Technology
Online ISSN : 1884-5452
Print ISSN : 0912-2664
ISSN-L : 0912-2664
Volume 40 , Issue 4
Showing 1-5 articles out of 5 articles from the selected issue
Original Articles
  • Naoki Momose, Asako Tokumine, Norio Iwamoto, Hitomi Okada, Rie Kusaura ...
    2013 Volume 40 Issue 4 Pages 469-477
    Published: 2013
    Released: January 25, 2014
    JOURNALS FREE ACCESS
    We designed and examined venous reservoir level automatically controlling systems for an open-fashion cardiopulmonary bypass(CPB)circuit(an open circuit level controller; OLC)and a closed-fashion CPB circuit(closed circuit level controller; CLC). The OLC system consists of a CPU(central processing unit)and a slender column inserted through the top of the venous reservoir for measuring hydrostatic pressure. The CPU analyzes the hydrostatic pressure in the column as a replacement for the venous blood level and regulates the blood pump speed in proportion to the change of the hydrostatic pressure. The CLC system consists of a commercially available level sensor, which is attached in the side wall of the venous reservoir for directly measuring the venous blood level, and a CPU regulating the blood pump speed for keeping the appropriate venous blood level.
    Using a mock circulation model, we confirmed the both systems could maintain an appropriate blood level in the venous reservoir and regulate blood pump speed, leading to guarantee easy and safe management of the cardiopulmonary bypass.
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  • --- Effects on the mental workload of reservoir level ---
    Takemi Kudo, Shouzoh Ueki
    2013 Volume 40 Issue 4 Pages 478-486
    Published: 2013
    Released: January 25, 2014
    JOURNALS FREE ACCESS
    In this cardiopulmonary bypass simulation experiment, the venous blood reservoir level was classified into high(1,000mL), medium(500mL), and low(200mL), and its influences on operators' mental workload were examined, involving 6 clinical engineering students and using physiological, behavioral, and subjective indices.
    No significant changes were observed in the coefficient of variation of R-R intervals, mean heart rate, or salivary amylase as physiological indices, or reaction time as a behavioral index. On the other hand, the mean weighted workload scores of the Japanese-version NASA-TLX as a subjective index significantly increased with a decrease in the reservoir level. Similarly, the mental and overall fatigue scores of the Brief Fatigue Inventory significantly increased with such a decrease.
    Based on these results, decreased reservoir levels may be associated with an increase in the mental workload, as well as mental and general fatigue levels, and, therefore, it may be necessary to consider operators' mental workload when setting the reservoir level.
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