Blood-pressure monitoring apparatus
First Claim
1. A blood-pressure monitoring apparatus comprising:
- a measuring device which includes an inflatable cuff adapted to apply a pressing pressure to a body portion of a living subject and which measures at least one blood-pressure value of the living subject by changing the pressing pressure of the inflatable cuff;
a pulse-wave-propagation-relating-information obtaining device which iteratively obtains a piece of pulse-wave-propagation-relating information relating to propagation of a pulse wave through an arterial vessel of the living subject;
estimating means for iteratively estimating a blood-pressure value, EBP, of the living subject, based on each piece of pulse-wave-propagation-relating information, PWPI, obtained by the pulse-wave-propagation-relating-information obtaining device, according to a linear relationship between pulse-wave-propagation-relating information and blood pressure, the linear relationship being defined by a following linear expression, EBP=α
(PWPI)+β
, where α
is a slope and β
is an intercept;
index-value calculating means for calculating, based on the blood-pressure value of the living subject measured by the measuring device, an index value indicative of a hardness of a blood vessel of the living subject;
slope determining means for determining, based on the calculated index value, the slope α
of the linear expression; and
intercept determining means for determining the intercept β
of the linear expression, based on the blood-pressure value measured by the measuring device, the piece of pulse-wave-propagation-relating information obtained by the pulse-wave-propagation-relating-information obtaining device when the blood-pressure value is measured by the measuring device, and the slope α
determined by the slope determining means.
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Accused Products
Abstract
A blood-pressure monitoring apparatus including a measuring device which includes an inflatable cuff adapted to apply a pressing pressure to a body portion of a living subject and measures a blood-pressure value of the living subject by changing the pressing pressure of the inflatable cuff, an information obtaining device which iteratively obtains a piece of information relating to propagation of a pulse wave through an arterial vessel of the subject, an estimating device for iteratively estimating a blood-pressure value, EBP, of the subject, based on each piece of pulse-wave-propagation-relating information, PWPI, obtained by the information obtaining device, according to a linear relationship between pulse-wave-propagation-relating information and blood pressure, the linear relationship being defined by a linear expression, EBP=α(PWPI)+α, where α is a slope and β is an intercept, an index-value calculating device for calculating an index value indicative of a hardness of a blood vessel of the subject, and a slope determining device for determining, based on the calculated index value, the slope α of the linear expression.
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Citations
16 Claims
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1. A blood-pressure monitoring apparatus comprising:
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a measuring device which includes an inflatable cuff adapted to apply a pressing pressure to a body portion of a living subject and which measures at least one blood-pressure value of the living subject by changing the pressing pressure of the inflatable cuff;
a pulse-wave-propagation-relating-information obtaining device which iteratively obtains a piece of pulse-wave-propagation-relating information relating to propagation of a pulse wave through an arterial vessel of the living subject;
estimating means for iteratively estimating a blood-pressure value, EBP, of the living subject, based on each piece of pulse-wave-propagation-relating information, PWPI, obtained by the pulse-wave-propagation-relating-information obtaining device, according to a linear relationship between pulse-wave-propagation-relating information and blood pressure, the linear relationship being defined by a following linear expression, EBP=α
(PWPI)+β
, where α
is a slope and β
is an intercept;
index-value calculating means for calculating, based on the blood-pressure value of the living subject measured by the measuring device, an index value indicative of a hardness of a blood vessel of the living subject;
slope determining means for determining, based on the calculated index value, the slope α
of the linear expression; and
intercept determining means for determining the intercept β
of the linear expression, based on the blood-pressure value measured by the measuring device, the piece of pulse-wave-propagation-relating information obtained by the pulse-wave-propagation-relating-information obtaining device when the blood-pressure value is measured by the measuring device, and the slope α
determined by the slope determining means.
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2. A blood-pressure monitoring apparatus comprising:
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a measuring device which includes an inflatable cuff adapted to apply a pressing pressure to a first body portion of a living subject and which measures at least one blood-pressure value of the living subject by changing the pressing pressure of the inflatable cuff;
a pulse-wave-propagation-relating-information obtaining device which iteratively obtains a piece of pulse-wave-propagation-relating information relating to propagation of a pulse wave through an arterial vessel of the living subject;
estimating means for iteratively estimating a blood-pressure value, EBP, of the living subject, based on each piece of pulse-wave-propagation-relating information, PWPI, obtained by the pulse-wave-propagation-relating-information obtaining device, according to a linear relationship between pulse-wave-propagation-relating information and blood pressure, the linear relationship being defined by a following linear expression, EBP=α
(PWPI)+β
, where α
is a slope and β
is an intercept;
a pulse-wave detecting device which detects a peripheral pulse wave including a plurality of heartbeat-synchronous pulses, from a second body portion of the living subject;
peripheral-pulse-wave-relating-value calculating means for iteratively calculating a peripheral-pulse-wave-relating value relating to each of the heartbeat-synchronous pulses of the peripheral pulse wave detected by the pulse-wave detecting device;
index-value calculating means for iteratively calculating, based on each of the iteratively calculated peripheral-pulse-wave-relating values, an index value indicative of a hardness of a blood vessel of the living subject; and
slope updating means for iteratively determining, based on each of the iteratively calculated index values, a new slope α
for the linear expression, and updating a current slope α
of the linear expression by replacing the current slope α
with the determined new slope α
.
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3. A blood-pressure monitoring apparatus comprising:
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a measuring device which includes an inflatable cuff adapted to apply a pressing pressure to a first body portion of a living subject and which measures at least one blood-pressure value of the living subject by changing the pressing pressure of the inflatable cuff;
a pulse-wave-propagation-relating-information obtaining device which iteratively obtains a piece of pulse-wave-propagation-relating information relating to propagation of a pulse wave through an arterial vessel of the living subject;
estimating means for iteratively estimating a blood-pressure value, EBP, of the living subject, based on each piece of pulse-wave-propagation-relating information, PWPI, obtained by the pulse-wave-propagation-relating-information obtaining device, according to a linear relationship between pulse-wave-propagation-relating information and blood pressure, the linear relationship being defined by a following linear expression, EBP=α
(PWPI)+β
, where α
is a slope and β
is an intercept;
index-value calculating means for calculating an index value indicative of a hardness of a blood vessel of the living subject; and
slope determining means for determining, based on the calculated index value, the slope α
of the linear expression.- View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
intercept determining means for determining the intercept β
of the linear expression, based on the blood-pressure value measured by the measuring device, the piece of pulse-wave-propagation-relating information obtained by the pulse-wave-propagation-relating-information obtaining device when the blood-pressure value is measured by the measuring device, and the slope α
determined by the slope determining means;
a pulse-wave detecting device which detects a peripheral pulse wave including a plurality of heartbeat-synchronous pulses, from a second body portion of the living subject;
peripheral-pulse-wave-relating-value calculating means for iteratively calculating a peripheral-pulse-wave-relating value relating to each of the heartbeat-synchronous pulses of the peripheral pulse wave detected by the pulse-wave detecting device;
the index-value calculating means comprising means for iteratively calculating, based on each of the iteratively calculated peripheral-pulse-wave-relating values, the index value indicative of the hardness of the blood vessel of the living subject; and
the slope determining means comprising slope updating means for iteratively determining a new slope α
for the linear expression, based on each of the iteratively calculated index values, and updating a current slope α
of the linear expression by replacing the current slope α
with the determined new slope α
.
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11. An apparatus according to claim 3, further comprising:
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a pulse-wave detecting device which detects a peripheral pulse wave including a plurality of heartbeat-synchronous pulses, from a second body portion of the living subject; and
peripheral-pulse-wave-relating-value calculating means for iteratively calculating a peripheral-pulse-wave-relating value relating to each of the heartbeat-synchronous pulses of the peripheral pulse wave detected by the pulse-wave detecting device, wherein the index-value calculating means comprises means for iteratively calculating, based on each of the iteratively calculated peripheral-pulse-wave-relating values, the index value indicative of the hardness of the blood vessel of the living subject.
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12. An apparatus according to claim 11, wherein the index-value calculating means comprises means for iteratively calculating the index value based on each piece of pulse-wave-propagation-relating information iteratively obtained by the pulse-wave-propagation-relating-information obtaining device and said each peripheral-pulse-wave-relating value iteratively calculated by the peripheral-pulse-wave-relating-value calculating means.
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13. An apparatus according to claim 6, wherein the peripheral-pulse-wave-relating-value calculating means comprises means for iteratively calculating a value relating to an area defined by a waveform of said each heartbeat-synchronous pulse of the peripheral pulse wave detected by the pulse-wave detecting device.
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14. An apparatus according to claim 3, wherein the index-value calculating means comprises means for calculating the index value based on the blood-pressure value measured by the measuring device and the piece of pulse-wave-propagation-relating information obtained by the pulse-wave-propagation-relating-information obtaining device when the blood-pressure value is measured by the measuring device.
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15. An apparatus according to claim 3, wherein the slope determining means comprises means for determining the slope α
- of the linear expression based on the calculated index value, Ia, according to a following expression;
α
=k×
Ia+c, where k and c are predetermined constants.
- of the linear expression based on the calculated index value, Ia, according to a following expression;
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16. An apparatus according to claim 3, further comprising starting means for judging whether the blood-pressure value estimated by the estimating means is abnormal, and starting a blood-pressure measurement of the measuring device when the estimated blood-pressure value is judged as being abnormal.
Specification