Experimental study of air intake during A-V MUF and confirmation of the bubble retention capacity of an oxygenator

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  • Nagamine Daisuke
    Department of Clinical Engineering Center, Toyama University Hospital
  • Shimaoka Kenji
    Department of Clinical Engineering Center, Toyama University Hospital
  • Tsunomori Mitsuru
    Department of Clinical Engineering Center, Toyama University Hospital
  • Sato Kuniaki
    Department of Clinical Engineering Center, Toyama University Hospital
  • Yoshimura Naoki
    富山大学　学術研究部医学系外科学（呼吸・循環・総合外科）講座

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  • A-V MUF施行時における人工肺の空気引き込み対策の実験的検討と確認された人工肺の気泡保持能力

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<p>During the Modified Ultrafiltration (MUF), negative pressure may arise in the oxygenator and air may be sent into the patient. Therefore, we added a flow path with a check valve to the conventional A-V MUF flow path. An experimental study was conducted on the effect of A-V MUF efficiency and measures to prevent air intake from the oxygenator.</p><p>These experiments on the impact of reduced A-V MUF efficiency due to the addition of a check valve showed no significant impact. An experimental measures to prevent air intake from the oxygenator is although all the pressures became negative, the flow rate of the check valve did not differ much from that of the MUF pump. On the other hands but there was a difference in the time for drawing air due to fluctuations in the MUF pump flow rate. With additional experiments, we found that we could adjust the oxygenator so that it could retain air inside it. Until the air is drawn into the secondary side of the oxygenator air could be retained inside the oxygenator by the surface tension arised in the arterial filter pores. The self-vent technology can remove air from hollow fiber and prevent misfeeding of air. The use of an oxygenator with a check valve and bubble retention function can enhance the safety of MUF.</p>

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