Omron Tateisi Electronics Co.

Other

Isao Kai

Satoshi Ueno

Osamu Shirasaki

Yoshinori Miyawaki

Satoshi Egawa

In an electronic blood pressure meter, artifacts or disturbances of blood pressure measurement due to the motions of the arm or the body of the person whose blood pressure is to be measured is detected from the level of a pulse wave signal. If the pulse wave signal continues to be above a certain reference level for more than a certain threshold time period, it is determined to be indicative of the presence of an artifact which prevents accurate measurement of blood pressure. This process of detecting an artifact can be conveniently implemented as an interruption routine of a microprocessor. When such an artifact is detected, a warning signal may be issued and the cuff may be rapidly vented so that the renewed measurement can be carried out without any further ado.

Electronic blood pressure meter having means for detecting artifacts

An electronic blood pressure monitor includes a cuff, a system for pressurizing the cuff, and pressure and pulse wave sensors in the cuff. In the monitor the maximum amplitude of the pulse wave is extracted and an area between the envelope lines of certain data is computed. Maximum area values are computed on the higher and lower sides of the cuff pressure corresponding to the maximum value of the pulse wave amplitude; from these area values are computed maximum and minimum blood pressure values. In another aspect, the pulse wave signal from the pulse wave sensor is separated into signal components greater and less than a reference value, these signal components are smoothed and combined and blood pressure values are determined from the combined signals and the cuff pressure values derived from the pressure sensor in the cuff.

Electronic blood pressure measuring device

An electronic blood pressure meter including a cuff, a pressure system for pressurizing and evacuating the cuff, a pressure sensor for detecting the pressure within the cuff, a pulse wave parameter extraction circuit and a blood pressure determining circuit. The pulse wave parameter extraction circuit extracts the maximum level difference in the pulse wave component of the cuff pressure over a certain time intervals and also provides pulse wave maximum and minimum values corresponding to the maximum and minimum values of the pulse wave components over each of the time intervals chosen. The electronic blood pressure meter may also include circuitry for finding maximum and minimum values on each of the higher and lower cuff pressure sides of the cuff and deriving blood pressure measuring readings therefrom.

An electronic device for measuring blood pressure, according to which either systolic pressure may be derived from mean pressure and diastolic pressure, or diastolic pressure may be derived from systolic pressure and mean pressure, whereby the time duration of the application of pressure to the patient's arm may be reduced because the pressure to be applied may only range substantially over between mean pressure and diastolic pressure or between systolic pressure and mean pressure. Additionally proposed is a means for improving the accuracy of the above-mentioned derivation of systolic pressure or diastolic pressure. As a result, considerable reduction in the time duration required for measurement may be reduced without any increase in measurement errors.

Device for measuring blood pressure

An electronic blood pressure meter including a cuff, a pressure system for pressurizing and evacuating the cuff, a pressure sensor for detecting pressure within the cuff and a pulse wave sensor for detecting the pulse wave component during the course of cuff pressure changes. The pulse wave sensor produces signals from which a pulse wave amplitude means extracts pulse wave amplitude in time sequence. The maximum value of the pulse wave amplitude is determined and maximum values of the pressure graph area on the higher and lower cuff pressure sides are determined. From these data blood pressure values are calculated

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Kyoto, Japan

Satoshi Ueno