The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 16, 1993
Filed:
Nov. 08, 1990
Yoshinori Miyawaki, Otsu, JP;
Omron Corporation, Kyoto, JP;
Abstract
An electronic blood pressure meter is disclosed which measures diastolic blood pressure. The blood pressure meter includes a cuff, a device for pressurizing and a device for depressurizing the cuff, and a device for detecting pressure in the cuff over time. A device is provided for detecting pulse waves, preferably in the form of an infrared light source and a reflected light detector. Processing circuitry is provided which detects either appearance or disappearance of a flat portion in the pulse wave by differentiating the pulse wave, measuring successive durations of time during which the differentiated pulse wave is between predetermined threshold values, and determining the moment at which the durations of time become less than a predetermined amount. The diastolic blood pressure value is then determined as the measured pressure in the cuff at the moment the flat portion of the pulse wave has appeared or disappeared.