Non-invasive and continuous blood-pressure estimation apparatus
First Claim
1. An apparatus for iteratively estimating an intra-arterial blood-pressure value of a living subject, based on information non-invasively obtained from a circulatory system of the subject, the apparatus comprising:
- a pulse-wave-propagation-relating-information obtaining device which non-invasively and 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;
a circulation-relating-information obtaining device which non-invasively and iteratively obtains a piece of circulation-relating information comprising at least one of a piece of heartbeat-relating information relating to heartbeat of the living subject and a piece of pulse-wave-area-relating information relating to area of a heartbeat-synchronous pulse of a volumetric pulse wave obtained from a peripheral body portion of the living subject; and
blood-pressure estimating means comprising a neural network which learns a plurality of sets of information each set of which comprises a blood-pressure value measured using an inflatable cuff, a piece of pulse-wave-propagation-relating information obtained when the blood-pressure value is measured using the cuff, and at least one of a piece of heartbeat-relating information obtained when the blood-pressure value is measured using the cuff and a piece of pulse-wave-area-relating information obtained when the blood-pressure value is measured using the cuff, the neural network iteratively estimating an intra-arterial blood-pressure value of the living subject, based on each piece of pulse-wave-propagation-relating information iteratively obtained by the pulse-wave-propagation-relating-information obtaining device and at least one of each piece of heartbeat-relating information and each piece of pulse-wave-area-relating information which is iteratively obtained by the circulation-relating-information obtaining device.
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Abstract
An apparatus for iteratively estimating an intra-arterial blood-pressure value of a living subject, including a first information obtaining device which non-invasively and iteratively obtains information relating to propagation of a pulse wave through an arterial vessel of the subject, a second information obtaining device which non-invasively and iteratively obtains information relating to heartbeat of the subject and/or information relating to area of a heartbeat-synchronous pulse of a volumetric pulse wave obtained from a peripheral body portion of the subject, and an estimating device including a neural network which learns sets of information each set of which includes a blood-pressure value measured using a cuff, pulse-wave-propagation-relating information obtained when the blood-pressure value is measured using the cuff, and heartbeat-relating information and/or pulse-wave-area-relating information obtained when the blood-pressure value is measured using the cuff, the neural network iteratively estimating an intra-arterial blood-pressure value of the subject, based on each piece of pulse-wave-propagation-relating information iteratively obtained by the first information obtaining device, and each piece of heartbeat-relating information and/or each piece of pulse-wave-area-relating information which are or is iteratively obtained by the second information obtaining device.
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Citations
13 Claims
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1. An apparatus for iteratively estimating an intra-arterial blood-pressure value of a living subject, based on information non-invasively obtained from a circulatory system of the subject, the apparatus comprising:
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a pulse-wave-propagation-relating-information obtaining device which non-invasively and 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;
a circulation-relating-information obtaining device which non-invasively and iteratively obtains a piece of circulation-relating information comprising at least one of a piece of heartbeat-relating information relating to heartbeat of the living subject and a piece of pulse-wave-area-relating information relating to area of a heartbeat-synchronous pulse of a volumetric pulse wave obtained from a peripheral body portion of the living subject; and
blood-pressure estimating means comprising a neural network which learns a plurality of sets of information each set of which comprises a blood-pressure value measured using an inflatable cuff, a piece of pulse-wave-propagation-relating information obtained when the blood-pressure value is measured using the cuff, and at least one of a piece of heartbeat-relating information obtained when the blood-pressure value is measured using the cuff and a piece of pulse-wave-area-relating information obtained when the blood-pressure value is measured using the cuff, the neural network iteratively estimating an intra-arterial blood-pressure value of the living subject, based on each piece of pulse-wave-propagation-relating information iteratively obtained by the pulse-wave-propagation-relating-information obtaining device and at least one of each piece of heartbeat-relating information and each piece of pulse-wave-area-relating information which is iteratively obtained by the circulation-relating-information obtaining device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
a blood-pressure measuring device which includes an inflatable cuff adapted to apply a pressing pressure to a body portion of the living subject and which measures a blood-pressure value of the living subject by changing the pressing pressure of the inflatable cuff; and
starting means for starting a blood-pressure measurement of the blood-pressure measuring device when the blood-pressure value of the living subject estimated by the blood-pressure estimating means is abnormal.
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9. An apparatus according to claim 1, further comprising an informing device which informs a user of an occurrence of an abnormality to the blood pressure of the living subject, when the blood-pressure value of the living subject estimated by the blood-pressure estimating means is abnormal.
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10. An apparatus according to claim 1, wherein the pulse-wave-propagation-relating-information obtaining device comprises at least one of pulse-wave-propagation-time calculating means for iteratively calculating a pulse-wave propagation time which is needed for each of a plurality of heartbeat-synchronous pulses of the pulse wave to propagate between two portions of the arterial vessel of the living subject, and pulse-wave-propagation-velocity calculating means for iteratively calculating a pulse-wave propagation velocity at which each of a plurality of heartbeat-synchronous pulses of the pulse wave propagates between two portions of the arterial vessel of the living subject.
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11. An apparatus according to claim 1, wherein the pulse-wave-propagation-relating-information obtaining device comprises an electrocardiographic-pulse-wave detecting device which includes a plurality of electrodes adapted to be put on a plurality of portions of the living body and detects an electrocardiographic pulse wave including a plurality of heartbeat-synchronous pulses, from the subject via the electrodes, and a photoelectric-pulse-wave detecting device which is adapted to be worn on a body portion of the living subject, and which emits a light toward the body portion and obtains a photoelectric pulse wave including a plurality of heartbeat-synchronous pulses, from the light received from the body portion.
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12. An apparatus according to claim 11, wherein the circulation-relating-information obtaining device comprises a heartbeat-relating-information obtaining device which non-invasively and iteratively obtains a piece of heartbeat-relating information, and wherein the heartbeat-relating-information obtaining device comprises pulse-period calculating means for iteratively calculating, as the piece of heartbeat-relating information, a pulse period equal to an interval between each pair of successive heartbeat-synchronous pulses of the electrocardiographic pulse wave detected by the electrocardiographic-pulse-wave detecting device.
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13. An apparatus according to claim 11, wherein the circulation-relating-information obtaining device comprises a pulse-wave-area-relating-information obtaining device which non-invasively and iteratively obtains a piece of pulse-wave-area-relating information, and wherein the pulse-wave-area-relating-information obtaining device comprises ratio calculating means for iteratively calculating, as the piece of pulse-wave-area-relating information, a ratio of an area defined by a waveform of each heartbeat-synchronous pulse of the photoelectric pulse wave as the volumetric pulse wave to a pulse period equal to an interval between each pair of successive heartbeat-synchronous pulses of the electrocardiographic pulse wave detected by the electrocardiographic-pulse-wave detecting device.
Specification