Electronic blood pressure meter

Details Electronic blood pressure meter Electronic blood pressure meter

1990-11-08

1993-03-16

Cohen, Lee S.

Surgery

Truss

Pad

128681, 128682, A61B 5022

Patent

active

051935481

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.

REFERENCES:
patent: 4105021 (1978-08-01), Williams et al.
patent: 4271843 (1981-09-01), Flynn
patent: 4703760 (1987-03-01), Miyawaki et al.
patent: 4712563 (1987-12-01), Link
patent: 4844084 (1989-07-01), Yamasawa
patent: 4862895 (1989-09-01), Yamasawa et al.
patent: 4872461 (1989-10-01), Miyawaki

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