US 6,283,922 B1Granted

Blood pressure monitor

AssigneeColin Corporation

InventorsMasami Goto, Hideo Nishibayashi, Kiyoyuki Narimatsu, Akihiro Yokozeki

Life of this patent

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Abstract

A blood pressure monitor including a cuff, a pressure sensor which detects a pressure in the cuff, a pressure regulating device which increases the pressure of the cuff, a pulse-amplitude determining device for determining an amplitude of each of pulses of a pulse wave which are produced in the cuff and detected by the pressure sensor while the cuff pressure is increased, a candidate determining device for determining, as a diastolic BP candidate, a pressure of the cuff which is detected by the pressure sensor and which corresponds to an amplitude of a first pulse of the pulses determined by the pulse-amplitude determining device, by judging whether the amplitude of the first pulse is not greater than a reference value which is smaller than an amplitude of at least one second pulse of the pulses, by a predetermined proportion of the amplitude of the second pulse, the amplitude of the second pulse being determined by the pulse-amplitude determining device after the amplitude of the first pulse is determined, and a BP determining device for determining, as a monitor diastolic BP value, the cuff pressure corresponding to the amplitude of the first pulse, when the candidate determining device determines, as the diastolic BP candidate, the cuff pressure corresponding to the amplitude of the first pulse, with respect to a predetermined number of the one or more second pulses.

Claims8

Dependent claims

A blood pressure monitor comprising:

an inflatable cuff which is adapted to be wound around a body portion of a living subject to press said body portion through which an artery of the subject extends;
a blood pressure measuring device which measures a blood pressure of the subject by changing a pressure in said cuff;
a pressure pulse wave sensor which is adapted to be pressed against a distal section of said artery located on a distal side of said cuff wound around said body portion, so as to detect a pressure pulse wave which is produced from said distal section of the artery and is propagated thereto via a skin tissue above said distal section;
relationship determining means for determining a relationship between blood pressure and magnitude of pressure pulse wave, based on the blood pressure measured by said blood pressure measuring device and a magnitude of the pressure pulse wave detected by said pressure pulse wave sensor;
blood pressure determining means for determining at least a diastolic blood pressure of the subject according to the determined relationship based on a magnitude of a lower-peak point of each of successive first heartbeat-synchronous pulses of said pressure pulse wave detected by said pressure pulse wave sensor;
cuff-pressure increasing means for increasing said pressure of said cuff at a predetermined rate;
a cuff pulse wave sensor which detects a cuff pulse wave which is a pressure oscillation produced in said cuff;
phase-difference determining means for determining a phase difference of respective lower-peak points of each of successive second heartbeat-synchronous pulses of said pressure pulse wave and a corresponding one of successive heartbeat-synchronous pulses of said cuff pulse wave, said second heartbeat-synchronous pulses of said pressure pulse wave and said heartbeat-synchronous pulses of said cuff pulse wave being detected by said pressure pulse wave sensor and said cuff pulse wave sensor, respectively, when said pressure of said cuff is increased at said predetermined rate by said cuff-pressure increasing means;
and
judging means for judging whether said determined relationship is accurate, based on at least one diastolic blood pressure determined by said blood pressure determining means and a pressure of said cuff corresponding to a time when the phase differences determined by said phase-difference determining means significantly largely change.

7 more elements

A blood pressure monitor, comprising:

at least one inflatable cuff which is adapted to be worn on at least one of a first body portion of a living subject to press the first body portion through which a first artery ot the subject extends and a second body portion of the subject to press the second body portion through which a second artery of the subject extends,
a blood pressure measuring device which measures a blood pressure of the subject by changing a pressure in the at least one inflatable cuff,
a pressure pulse wave sensor which is adapted to be worn on a third portion of the subject to press the third portion through which a third artery of the subject extends, the pressure pulse wave sensor detecting a pressure pulse wave which is produced from the third artery and is propagated thereto via skin tissue,
relationship determining means for determining a relationship between blood pressure and magnitude of the pressure pulse wave, based on the blood pressure measured by the blood pressure measuring device and a magnitude of the pressure pulse wave detected by the pressure pulse wave sensor,
blood pressure determining means for determining at least a diastolic blood pressure of the subject, according to the determined relationship, based on a magnitude of a lower peak point of each of successive first heartbeat-synchronous pulses of the pressure pulse wave detected by the pressure pulse wave sensor,
cuff pressure increasing means for increasing a pressure in the at least one inflatable cuff at a predetermined rate,
a cuff pulse wave sensor which detects a cuff pulse wave which is a pressure oscillation produced in the at least one inflatable cuff,
phase-difference determining means for determining a phase difference of respective lower peak points of each of successive second heartbeat-synchronous pulses of the pressure pulse wave and a corresponding one of successive heartbeat-synchronous pulses of the cuff pulse wave, the second heartbeat-synchronous pulses of the pressure pulse wave and the heartbeat-synchronous pulse of the cuff pulse wave being detected by the pressure pulse wave sensor and the cuff pulse wave sensor, respectively, when the pressure of the at least one inflatable cuff is increased at the predetermined rate by the cuff pressure increasing means,
judging means for judging whether the determined relationship is accurate, based on at least one diastolic blood pressure determined by the blood pressure determining means and a pressure of the at least one inflatable cuff corresponding to a time when the phase difference determined by the phase difference determining means significantly largely changes.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/397,666Filed 16 Sep 1999 · division
Priority: 24 Oct 1996
Granted: 4 Sep 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

A61B 5/02225
By applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers: using the oscillometric method
A61B 5/02116
From analysis of pulse wave characteristics: of pulse wave amplitude
A61B 5/02125
From analysis of pulse wave characteristics: of pulse wave propagation time
A61B 5/0225
By applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers: the pressure being controlled by electric signals, e.g.…

Family

Application08/740,126Parent of this division · filed 24 Oct 1996
Application09/152,464Parent of this division · filed 14 Sep 1998
US 5,860,932 AParent of this division · filed 19 Jan 1999
US 6,007,402 AParent of this division
US 6,007,492 ARelated patent
US 6,283,922 B1This patent

From the US filing history. Foreign family members aren’t listed.