Appl. No. Filed Patented Assignee
Edmond R. Pelta
71 Sheffield Ave., Pacific Palisades, and
Kenneth S. Gold, Canoga Park, California
627,097
March 30,1967
Dec. 8,1970
Becton, Dickinson and Company
Rutherford, New Jersey
a corporation of New Jersey, by mesne
assignments to
3,144,019 8/1964 Haber 128/2.06
3,230,358 1/1936 Davis etal 330/UOX
3,316,902 5/1967 Wincheletal 128/2.1UX
3,347,223 10/1967 Pacela..... 128/2.1
3,352,300 11/1967 Rose 128/2.06
Primary Examiner—William E. Kamm
Attorney—Fulwider, Patton, Rieber, Lee & Utecht
ABSTRACT: An impedance pneumograph apparatus for monitoring respiration and detecting apnea, i.e., cessation of respiration. A high frequency carrier signal is impressed on a pair of biopotential electrodes applied to the subject whose respiration is being monitored. The respiration signal representing tidal volume impedance changes in the lungs of the subject modulates the high frequency carrier and is subsequently amplified and demodulated. The demodulated output is used to standardize the high frequency source and derive a direct impedance reading on a galvanometer. The demodulated output is also processed to provide respiration waveform and respiration rate information. Cessation of respiration for a preselected period of time is automatically sensed, and audio and visual alarms are activated to indicate the occurrence of apnea.
|
