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A flexible system for closed-loop ventilator development

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Abstract

The feasibility of using a microcomputer to regulate the delivery of artificial ventilation was investigated experimentally. To carry out this study, a sampled-data proportional, integral, derivative feedback controller was implemented on a commercial microcomputer and interfaced with a digital/analogue model of a prototype ventilator and two-compartment patient. The microcomputer sampled end-tidal CO2 and calculated a new frequency of ventilation from the difference of end-tidal CO2 and a desired set point value. Use of a microcomputer programmable in BASIC allowed easy manipulation of feedback structure. With the proper choice of feedback constants, the microcomputer was able to maintain end-tidal CO2 at a desired set point.

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Authors and Affiliations

  1. From the Biomedical Engineering Program, California State University, 95819, Sacramento, California

    W. I. Marsh M.S. & W. D. Smith Ph.D.

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  1. W. I. Marsh M.S.
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  2. W. D. Smith Ph.D.
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Marsh, W.I., Smith, W.D. A flexible system for closed-loop ventilator development. J Med Syst 6, 53–59 (1982). https://doi.org/10.1007/BF00994120

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  • DOI: https://doi.org/10.1007/BF00994120

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