Non-invasive automatic blood pressure measuring apparatus

• US 5,072,736 A
• Filed: 01/19/1990
• Issued: 12/17/1991
• Est. Priority Date: 01/19/1990
• Status: Expired due to Fees

• Current Assignee: Nihon Kohden Corporation
• Original Assignee: Nihon Kohden Corporation
• Inventors: Hyogo, Mitsushi, Ogawa, Keikitsu, Shindo, yoshiaki, Takeda Sunoa
• Primary Examiner(s): Pellegrino, Stephen C.
• Assistant Examiner(s): Longo, Robin R.
• Application Number:
  US07/467,780
• Time in Patent Office: 697 Days
• Field of Search: 128/672, 128/677, 128/680, 128/661.01, 128/661.08, 128/661.09, 128/661.1, 128/691, 128/681-689
• US Class Current: 600/493
• CPC Class Codes: A61B 5/0225 the pressure being controlled by electric signals, e.g. derived from Korotkoff sounds
• CPC Class Codes: A61B 8/06 Measuring blood flow measuring volume flow in general G01F, e.g. G01F1/66, G01F1/72; measuring speed of fluids in general G01P5/00

Abstract

A non-invasive automatic blood pressure measuring apparatus consisting of a blood flow meter non-invasively detecting the blood flow of the arteries on the proximal or distal side of the cuff, a blood flow standing up point detecting means detecting the standing up point of the blood flow signal output from the blood flow meter in the decompression process of the internal pressure in the cuff and a blood flow returning point detecting means detecting the returning point of the blood flow signal to the steady state in the further successive decompression process, and detecting the internal pressure in the cuff of the standing up point as the maximal value of the blood pressure and the internal pressure in the cuff of the returning point as the minimal value of the blood pressure.

Claims

1. A non-invasive automatic blood pressure measuring apparatus comprising:

a measuring cuff adapted for decompression after compression and attachment to a part of a body, the measuring cuff having a proximal side and a distal side;

a blood flow meter non-invasively detecting the blood flow of the arteries on the proximal or distal side of said cuff.

a moving average blood flow signal detecting means calculating a moving average blood flow signal from the blood flow of the arteries on the proximal or distal side of said cuff, the average blood flow signal detecting means calculating a 1% average blood flow signal value representative of a blood flow standing up point and a 99% average blood flow signal value representative of a blood flow returning point;

a blood flow standing up point detecting means monitoring blood flow to detect the 1% average blood flow signal value during a decompression process of internal pressure on said cuff;

a blood flow returning point detecting means monitoring the blood flow to detect the 99% average blood flow signal value during a further decompression process of internal pressure on said cuff;

a maximal blood pressure holding means storing a maximal blood pressure value corresponding to the internal pressure in said cuff when the 1% average blood flow signal value is detected by the blood flow standing up point detecting means;

a minimal blood pressure holding means storing a minimal blood pressure value corresponding to the internal pressure in said cuff when the 99% average blood flow signal value is detected by the blood flow standing up point detecting means; and

an output means indicating or printing out the stored maximal and minimal blood pressure values.

2. A non-invasive automatic blood pressure measuring apparatus comprising:

a measuring cuff adapted for decompression and compression and for attachment to a part of a patient'"'"'s body, the measuring cuff having a proximal side and a distal side;

a blood flow meter non-invasively detecting the blood flow of a patient'"'"'s artery on one of the proximal and distal side of the cuff, the blood flow meter providing an output signal corresponding to the blood flow measured through the artery;

a moving average blood flow signal calculating means responsive to the output signal from the blood flow meter, the moving average blood flow signal calculating means calculating a moving average blood flow value from the blood flow measured by the blood flow meter, and further calculating a 1% value corresponding to about 1% of the moving average blood flow value and representative of a blood flow standing up point and a 99% value corresponding to about 99% of the moving average blood flow value and representative of a blood flow returning point;

a blood flow standing up point detecting means responsive to the output signal of the blood flow meter, the blood flow standing up point detecting means detecting when the 1% value of blood flow is reached during a decompression process of the internal pressure in the cuff;

a blood flow returning point detecting means responsive to the output signal from the blood flow meter, the blood flow returning point detecting means detecting when the 99% value of blood flow is reached during a further decompression process of the internal pressure in the cuff;

maximal blood pressure holding means coupled to the blood flow standing up point detecting means, the maximal blood pressure holding means storing a maximal blood pressure value corresponding to the internal pressure in the cuff when the 1% value of blood flow is detected by the blood flow standing up point detecting means;

minimal blood pressure holding means coupled to the blood flow returning point detecting means, the minimal blood pressure holding means storing a minimal blood pressure value corresponding to the internal pressure in the cuff when the 99% value of blood flow is detected by the blood flow returning point detecting means; and

output means coupled to the maximal and minimal blood pressure holding means, the output means indicating the stored maximal and minimal blood pressure values.