RESPIRATION DIAGNOSIS APPARATUS
 Inventors: Akio Yamanishi, Hyogo; Kenji Hamaguri, Osaka, both of Japan
 Assignee: Minolta Co., Ltd., Osaka, Japan
 Appl. No.: 95,296
 Filed: Jul. 21,1993
 Foreign Application Priority Data
Jul. 23, 1992 [JP] Japan 4-197085
 Int. CL« A61B5/08
 U.S. CI 128/633; 128/666;
 Field of Search 128/633-634,
128/664-665, 666, 670-671, 716, 721-724;
 References Cited
U.S. PATENT DOCUMENTS
4,777,962 10/1988 Watson et al 128/721 X
4,802,485 2/1989 Bowers et al 128/633
5,146,916 9/1992 Kallok et al 607/62 X
[ii] Patent Number: 5,385,144  Date of Patent: Jan. 31,1995
The Japanese Journal of Thoracic Diseases, Special
Edition, (vol. 30), Apr. 1992.
Primary Examiner—Angela D. Sykes
Attorney, Agent, or Firm—Price, Gess & Ubell
The object of this invention is to provide an extremely simple device to extract information to distinguish between obstructive apnea and central apnea and which performs this operation automatically based on the extracted information.
The device is equipped with analog signal processor 2 for generating pulse wave signals based on light received from a light emitting means and passing through or reflecting off living tissue; pulse wave base line analog signal processor 9 for extracting change components of a base line of the generated pulse wave signal; and master microcomputer 6 for distmguishing between obstructive apnea and central apnea on the basis of the extracted pulse wave base line change components.
11 Claims, 6 Drawing Sheets