Method and apparatus for measuring pulmonary ventilation
Method and apparatus for monitoring respiration
Method and apparatus for calibrating respiration monitoring system
Non-invasive method for monitoring cardiopulmonary parameters
Non-invasive method for semiquantitative measurement of neck volume changes
Respiration and heart rate monitoring apparatus
Single position non-invasive calibration technique Patent #: 4834109
ApplicationNo. 345568 filed on 05/01/1989
US Classes:128/200.24, RESPIRATORY METHOD OR DEVICE600/534Detecting body movement attending breathing
ExaminersPrimary: Eickholt, Eugene H.
Attorney, Agent or Firm
Foreign Patent References
International ClassA61M 016/00
AbstractA method and apparatus for accurately measuring respiratory flow, while the subject breathes, without using a mouthpiece, face mask or any device about the head. The rate of change of the circumference of the rib cage (chest) and the rate of change of the circumference of the abdomen are measured using an extensible belt with series strips of piezoelectric film. The stress on the film produces an electric output proportional to the rate of application of stress when connected to a proper electronic amplifier. Calibration is performed by measuring the circumference changes while the subject performs an isovolume maneuver for several breaths or while the subject breathes through a pneumotachometer and mouthpiece at a variable rate for several breaths.