Electronic blood pressure measuring device

• US 4,776,344 A
• Filed: 02/27/1986
• Issued: 10/11/1988
• Est. Priority Date: 02/28/1985
• Status: Expired due to Term

• Current Assignee: Omron Healthcare Company Limited (Omron Corporation)
• Original Assignee: Omron Tateisi Electronics Co. (Omron Corporation)
• Inventors: Egawa, Satoshi, Ueno, Satoshi, Shirasaki, Osamu, Miyawaki, Yoshinori
• Primary Examiner(s): Cohen, Lee S.
• Application Number:
  US06/833,151
• Time in Patent Office: 957 Days
• Field of Search: 128/677, 128/679-683, 564/417
• US Class Current: 600/494
• CPC Class Codes: A61B 5/02116 of pulse wave amplitude A61B5/02225 takes precedence
• CPC Class Codes: A61B 5/02225 using the oscillometric method
• CPC Class Codes: A61B 5/0225 the pressure being controlled by electric signals, e.g. derived from Korotkoff sounds
• CPC Class Codes: A61B 5/7239 using differentiation including higher order derivatives

Abstract

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.

Claims

1. An electronic blood pressure meter, comprising:

(a) a cuff;

(b) a pressure system coupled to said cuff for pressurizing and evacuating said cuff;

(c) a pressure sensor coupled to said cuff for detecting the pressure within said cuff;

(d) a pulse wave parameter extraction means which extracts the maximum level difference in the pulse wave component of the cuff pressure over a certain time interval, for each of a plurality of time intervals;

(e) a blood pressure determining means for determining a blood pressure according to said cuff pressure and said pulse wave parameter;

(f) a pulse wave maximum value corresponding cuff pressure extracting means for extracting the cuff pressure corresponding to the maximum value of the pulse wave component over each of said time intervals;

(g) a pulse wave minimum value corresponding cuff pressure extracting means for extracting the cuff pressure corresponding to the minimum value of the pulse wave component over each of said time intervals; and

(h) a cuff pressure averaging means for computing an average value of said cuff pressure extracted by said pulse wave maximum value corresponding cuff pressure extracting means and said cuff pressure extracted by said pulse wave minimum value corresponding cuff pressure extracting means;

(i) said average value as computed by said cuff pressure averaging means being taken as the cuff pressure of a particular time interval.