Automatic blood pressure monitoring system

• US 4,780,824 A
• Filed: 12/29/1986
• Issued: 10/25/1988
• Est. Priority Date: 12/27/1985
• Status: Expired due to Term

• Current Assignee: Colin Medical Technology Corporation (Omron Corporation)
• Original Assignee: Nippon Colin Company Limited
• Inventors: Yokoe, Hifumi, Niwa, Minoru
• Primary Examiner(s): Smith, Jerry
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US06/947,829
• Time in Patent Office: 666 Days
• Field of Search: 128/666, 128/667, 128/671, 364/416, 364/417
• US Class Current: 600/513
• CPC Class Codes: A61B 5/02241 of small dimensions, e.g. adapted to fingers
• CPC Class Codes: A61B 5/02255 the pressure being controlled by plethysmographic signals, e.g. derived from optical sensors
• CPC Class Codes: A61B 5/14552 Details of sensors specially adapted therefor

Abstract

An automatic blood pressure monitoring system includes a device which detects the degree of saturation of oxygen in the blood at a peripheral part of the body. The detecting device generates a signal if the degree of saturation is detected to be abnormal. A control device operates a blood pressure measuring device in response to the signal indicating abnormal oxygen saturation. In a second embodiment, a trigger device periodically generates a signal to operate the blood pressure measuring device. When an abnormal oxygen saturation is detected, a signal operates the blood pressure measuring device and the triggering interval is shortened.

Claims

1. An automatic blood pressure monitoring system for automatically obtaining blood pressure measurements, comprising:

determining means for determining a measure of blood pressure of a living body;

detecting means for detecting a degree of saturation of oxygen in blood which flows in a peripheral part of said living body, said detecting means generating a signal representative of an abnormality if said degree of saturation of oxygen is found abnormal; and

control means responsive to said signal supplied from said detecting means, to start said determining means to determine said measure of blood pressure of said living body.

2. An automatic blood pressure monitoring system as recited in claim 1, wherein said detecting means comprises an air bag for oppressing said peripheral part of said living body so as to remove the blood out of veins and arteries of the peripheral part.

3. An automatic blood pressure monitoring system as recited in claim 2, wherein said detecting means further comprises a lamp for emitting light toward said pheripheral part of said living body, said light emitted by said lamp being transmitted through the peripheral part.

4. An automatic blood pressure monitoring system as recited in claim 3, wherein said detecting means further comprises first sensor means for selectively receiving light of a first wavelength range out of said light which has been transmitted through said peripheral part of said living body, the amount of said first wavelength range light received by said first sensor means being varied in association with the volume of blood at said peripheral part and the quantity of tissue at said peripheral part but remaining unaffected by the degree of saturation of oxygen in said blood, said first sensor means generating a first signal corresponding to the amount of the first wavelength range light received, said detecting means also comprising second sensor means for selectively receiving light of a second wavelength range out of the light which has been transmitted through the peripheral part, the amount of said second wavelength range light received by said second sensor means being varied in association with the volume of blood at the preiphral part, the quantity of tissue at the peripheral part and the degree of saturation of oxygen in the blood, said second sensor means generating a second signal corresponding to the amount of the second wavelength range light received.

5. An automatic blood pressure monitoring system as recited in claim 4, wherein said lamp emits said light and said first and second sensor means receive said first and second wavelength range lights and generate said first and second signals, respectively, and means are provided to operate said lamp and said signals in both cases where said peripheral part of said living body is oppressed by said air bag and where the peripheral part is not oppressed by the air bag.

6. An automatic blood pressure monitoring system as recited in claim 5, wherein said detecting means further comprises calculator means for receiving said first signal from said first sensor means and said second signal from said second sensor means, in said both cases, said calculator means determining said degree of saturation of oxygen in the blood of the living body, based on the first and second signals received in the both cases, and generating signal representative of said degree determined.

7. An automatic blood pressure monitoring system as recited in claim 6, wherein said detecting means further comprises storing means for storing a reference degree of saturation of oxygen and generating a signal representative of said reference degree stored, said detecting means also comprising abnormality discriminator means for receiving said signal from said calculator means and said signal from said storing means, checking if said degree determined by said calculator means is abnormal compared to said reference degree stored by said storing means, and generating to said control means a signal representative of an abnormality if the degree determined by the calculator means is found abnormal.

8. An automatic blood pressure monitoring system as recited in claim 4, wherein said first light selectively received by said first sensor means has wavelengths of around 800 millimicrons, while said second light selectively received by said second sensor means has wavelengths of around 600 mμ

.

9. An automatic blood pressure monitoring system for automatically obtaining blood pressure measurements, comprising:

determining means for determining a measure of blood pressure of a living body;

detecting means for detecting a degree of saturation of oxygen in blood which flows in a peripheral part of said living body, said detecting means generating a signal representative of an abnormality if said degree of saturation of oxygen is found abnormal; and

trigger means for generating a first signal at intervals to periodically start said determining means so as to determine said measure, said trigger means being responsive to said signal supplied from said detecting means, to generate a second signal at intervals shorter than said intervals at which to generate said first signal, so as to periodically start said determining means for determining said measure.