« PreviousContinue »
United States Patent  [ii] Patent Number: 4,802,485
Bowers et al.  Date of Patent: Feb. 7,1989
 SLEEP APNEA MONITOR
 Inventors: David L. Bowers, La Mesa; Gunther W. Kienle, El Cajon, both of Calif.
 Assignee: Sentel Technologies, Inc., Waukesha, Wis.
 Appl. No.: 92,055
 Filed: Sep. 2,1987
 Int. CI.* A61B5/00
 U.S. Q 128/633; 128/637;
 Field of Search 128/709, 670, 700, 725,
128/633, 637, 644, 671
 References Cited
U.S. PATENT DOCUMENTS
1,619,005 3/1927 Strong 128/671
3,998,213 12/1976 Price 128/644
4,321,930 3/1982 Jobsiso et al 128/633
4,359,726 11/1982 Lewiner et al. .
4,509,527 4/1985 Fraden .
4,700,708 10/1987 New, Jr. et al 128/633
"Kynar Piezo Film Technical Manual", pp. 1-26, Penn-
walt Corporation Copyright 1983.
"Watch Bird Apnea Monitor", Bernard DeBerry,
M.D., F.A.C.S., pp. 1-3.
"Sleep Apnea Syndromes", Circle Reader Service Card
No. 37-40, Respiratory Therapy, Jan./Feb. 1981, 1981 Barrington Publications, Inc.
"Piezo Film Sensors", The Journal of Machine Perception, May 1986, vol. 3, No. 5.
"Kynar Piezo Film", published by Pennwalt Corporation.
"Obstructive Sleep Apnea", Symposium on Sleep Disorders, Colin E. Sullivan, (Med. A.M.B. B.S., Ph.D. F.R.A.C.P. and Faiq G. Issa, M.B., B.S. Ph.D. "Analysis of Apnea in Sleep Apnea", by David Kurtz and Jean Krieger 1978 Alan R. Liss, Inc.
Primary Examiner—William E. Wayner
Attorney, Agent, or Firm—Willian Brinks Olds Hofer
Gilson & Lione Ltd.
A sleep apnea monitor includes an Sa02 sensor, a breathing sensor, a snoring sensor, and a head position sensor, all of which are mounted to a headgear. The breathing sensor preferably includes a piezo-electric film formed of a generally cylindrical shape positioned between the nose and mouth of the subject such that exhaled air warms the film and generates an electric signal indicative of the brathing pattern of the subject. Preferably, the region bounded by the piezo-electric film is used as a resonant cavity which is acoustically coupled to a microphone included in the snoring sensor. In one embodiment, data is logged from the sleep apnea monitor at the rate of one measurement for each pulse beat of the subject. In this way, data recording is synchronized with a physiological variable.
17 Claims, 9 Drawing Sheets