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A microprocessor-controlled data gathering system for telemetry and analysis of spirometry waveforms was implemented using a completely digital design. Spirometry waveforms were obtained from an optical shaft encoder attached to a rolling seal spirometer. Time intervals between 10-ml volume changes (volume sampling) were stored. The digital design eliminated problems of analog signal sampling. The system measured flows up to 12 liters/sec with 5% accuracy and volumes up to 10 liters with 1% accuracy. Transmission of 10 waveforms took about 3 min. Error detection assured that no data were lost or distorted during transmission. A pulmonary physician at the central hospital reviewed the volume-time and flow-volume waveforms and interpretations generated by the central computer before forwarding the results and consulting with the rural physician. This system is suitable for use in a major hospital, rural hospital, or small clinic because of the system's simplicity and small size.
D V Ostler, and
R M Gardner, and
R O Crapo
January 1993,
Biomedical sciences instrumentation,
D V Ostler, and
R M Gardner, and
R O Crapo
October 2007,
IEEE transactions on ultrasonics, ferroelectrics, and frequency control,
D V Ostler, and
R M Gardner, and
R O Crapo
December 1979,
The Journal of pharmacy and pharmacology,
D V Ostler, and
R M Gardner, and
R O Crapo
September 2010,
International journal of oral and maxillofacial surgery,
D V Ostler, and
R M Gardner, and
R O Crapo
August 1966,
The American review of respiratory disease,
D V Ostler, and
R M Gardner, and
R O Crapo
June 1983,
Computer programs in biomedicine,
D V Ostler, and
R M Gardner, and
R O Crapo
April 2009,
Computers in biology and medicine,
D V Ostler, and
R M Gardner, and
R O Crapo
June 1977,
Iyo denshi to seitai kogaku. Japanese journal of medical electronics and biological engineering,
D V Ostler, and
R M Gardner, and
R O Crapo
January 1988,
Journal of electrocardiology,
D V Ostler, and
R M Gardner, and
R O Crapo
November 2007,
Optics express,
