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[Recent technical advances in portable oxygen delivery systems].

K Machida1, Y Kawabe, M Mori

  • 1Tokyo National Chest Hospital, Japan.

Nihon Kyobu Shikkan Gakkai Zasshi
|August 1, 1992
PubMed
Summary

Patients with chronic respiratory failure desire lighter portable oxygen systems. A new demand oxygen delivery system (DODS) was evaluated for home oxygen therapy (HOT), showing potential for improved patient mobility and quality of life.

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Area of Science:

  • Pulmonary Medicine
  • Biomedical Engineering

Background:

  • Home oxygen therapy (HOT) is increasingly common, with over 18,000 patients in Japan utilizing it since 1985.
  • Oxygen concentrators, particularly molecular sieve types, dominate delivery methods (>90%), but portable options like oxygen cylinders and liquid oxygen systems are also available.
  • Patient demand for lighter, longer-duration portable oxygen supply systems is significant.

Purpose of the Study:

  • To evaluate a newly designed demand oxygen delivery system (DODS) for patients requiring home oxygen therapy.
  • To assess the feasibility and performance of the DODS in patients with chronic respiratory failure during exercise.

Main Methods:

  • Nineteen patients with chronic respiratory failure were enrolled.
  • A newly designed DODS (TER-20 Teijin) weighing 2.4 kg, including a 1.1 L oxygen cylinder, was assessed.

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  • A crossover trial compared breathing room air (no weight) versus pulse and continuous oxygen flow with the 2.4 kg DODS during 6-minute walking tests and treadmill walking.

    • Main Results:

    • Baseline arterial blood gases at rest (room air) indicated significant hypoxemia and hypercapnia (PaO2 61.9±6.3 torr, PaCO2 63.8±9.4 torr).
    • The study evaluated the DODS's performance under various conditions, including exercise, comparing different oxygen delivery modes.
    • Data on exercise capacity (6-minute walk, treadmill) with the DODS was collected.

    Conclusions:

    • The newly designed demand oxygen delivery system (DODS) offers a potential solution to patient desire for lighter, longer-duration portable oxygen.
    • Further evaluation is needed to fully characterize the benefits and efficacy of the DODS in improving exercise tolerance and quality of life for HOT patients.
    • The DODS may represent a significant advancement in portable oxygen delivery for managing chronic respiratory failure.