Blood pressure monitor
First Claim
1. 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;
a pressure sensor which detects a pressure in said cuff;
a cuff-pressure regulating device which increases the pressure of said cuff;
pulse-amplitude determining means for determining an amplitude of each of pulses of a pulse wave which are produced in said cuff and detected by said pressure sensor while the pressure of said cuff is increased by said cuff-pressure regulating device;
candidate determining means for determining, as a diastolic blood pressure candidate, a pressure of said cuff which is detected by said pressure sensor and which corresponds to an amplitude of a first pulse of said pulses determined by said pulse-amplitude determining means, by judging whether the amplitude of said first pulse is not greater than a reference value which is smaller than an amplitude of at least one second pulse of said pulses, by a predetermined proportion of the amplitude of said second pulse, the amplitude of said second pulse being determined by said pulse-amplitude determining means after the amplitude of said first pulse is determined; and
blood-pressure determining means for determining, as a monitor diastolic blood pressure value, said pressure of said cuff corresponding to said amplitude of said first pulse, when said candidate determining means determines, as said diastolic blood pressure candidate, said pressure of said cuff corresponding to said amplitude of said first pulse, with respect to a predetermined number of said at least one second pulse.
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Accused Products
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.
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Citations
20 Claims
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1. A blood pressure monitor comprising:
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an inflatable cuff which is adapted to be wound around a body portion of a living subject to press said body portion;
a pressure sensor which detects a pressure in said cuff;
a cuff-pressure regulating device which increases the pressure of said cuff;
pulse-amplitude determining means for determining an amplitude of each of pulses of a pulse wave which are produced in said cuff and detected by said pressure sensor while the pressure of said cuff is increased by said cuff-pressure regulating device;
candidate determining means for determining, as a diastolic blood pressure candidate, a pressure of said cuff which is detected by said pressure sensor and which corresponds to an amplitude of a first pulse of said pulses determined by said pulse-amplitude determining means, by judging whether the amplitude of said first pulse is not greater than a reference value which is smaller than an amplitude of at least one second pulse of said pulses, by a predetermined proportion of the amplitude of said second pulse, the amplitude of said second pulse being determined by said pulse-amplitude determining means after the amplitude of said first pulse is determined; and
blood-pressure determining means for determining, as a monitor diastolic blood pressure value, said pressure of said cuff corresponding to said amplitude of said first pulse, when said candidate determining means determines, as said diastolic blood pressure candidate, said pressure of said cuff corresponding to said amplitude of said first pulse, with respect to a predetermined number of said at least one second pulse. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A blood pressure monitor comprising:
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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 successively 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;
waveform-characteristic determining means for determining a characteristic of a lower-peak portion of a waveform of each of successive second heartbeat-synchronous pulses of said pressure pulse wave which are detected by said pressure pulse wave sensor when said pressure of said cuff is increased at said predetermined rate by said cuff-pressure increasing means, said lower-peak portion including a lower-peak point of said each second heartbeat-synchronous pulse; 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 waveform characteristics determined by said waveform-characteristic determining means significantly largely change.
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13. A blood pressure monitor comprising:
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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.
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14. A blood pressure monitor comprising:
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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 mean blood pressure of the subject according to the determined relationship based on a mean magnitude 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;
pulse-area calculating means for calculating an area defined by each of successive second heartbeat-synchronous pulses of said pressure pulse wave which are detected by said pressure pulse wave sensor when said pressure of said cuff is increased at said predetermined rate by said cuff-pressure increasing means;
half-area identifying means for identifying that the pulse areas calculated by said pulse-area calculating means have decreased to half an initial pulse area obtained before said cuff-pressure increasing means starts increasing said pressure of said cuff; and
judging means for judging whether said determined relationship is accurate, based on at least one mean blood pressure determined by said blood pressure determining means and a pressure of said cuff corresponding to a time when said half-area identifying means identifies that the pulse areas calculated by said pulse-area calculating means have decreased to half said initial pulse area.
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15. A blood pressure monitor comprising:
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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 a blood pressure of the subject according to the determined relationship based on a magnitude of each of successive first heartbeat-synchronous pulses of said pressure pulse wave detected by said pressure pulse wave sensor;
cuff-pressure regulating means for increasing said pressure of said cuff up to a predetermined value and holding the cuff pressure at said predetermined value;
pulse-area calculating means for calculating an area defined by each of successive second heartbeat-synchronous pulses of said pressure pulse wave which are detected by said pressure pulse wave sensor when said cuff pressure is held at said predetermined value by said cuff-pressure regulating means; and
judging means for judging whether said determined relationship is accurate, based on a ratio of the calculated area of at least one said second heartbeat-synchronous pulse of said pressure pulse wave detected by said pressure pulse wave when said cuff pressure is held at said predetermined value by said cuff-pressure regulating means, to an initial pulse area obtained before the cuff-pressure regulating means starts increasing said cuff pressure.
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16. A blood pressure monitor comprising:
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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 cuff pulse wave sensor which detects a cuff pulse wave which is a pressure oscillation produced in said cuff;
a distal pulse wave sensor which detects a distal pulse wave from a distal section of said artery located on a distal side of said cuff wound around said body portion;
cuff-pressure increasing means for increasing said pressure of said cuff at a predetermined rate;
first peak-interval determining means for determining a first interval between an upper-peak point and a lower-peak point of each of first heartbeat-synchronous pulses of said distal pulse wave which are detected by said distal pulse wave sensor when said pressure of said cuff is increased at said predetermined rate by said cuff-pressure increasing means;
second peak-interval determining means for determining a second interval between an upper-peak point and a lower-peak point of each of second heartbeat-synchronous pulses of said cuff pulse wave which are detected by said cuff pulse wave sensor when said pressure of said cuff is increased at said predetermined rate by said cuff-pressure increasing means;
difference determining means for determining a difference between the first interval of said each of said first heartbeat-synchronous pulses and the second interval of a corresponding one of said second heartbeat-synchronous pulses; and
blood pressure determining means for determining, as a diastolic blood pressure of the subject, a pressure of said cuff corresponding to a time when the differences determined by said difference determining means significantly largely change. - View Dependent Claims (17, 18)
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19. A blood pressure monitor comprising:
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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;
first peak-interval determining means for determining a first interval between an upper-peak point and a lower-peak point of each of first heartbeat-synchronous pulses of said distal pulse wave which are detected by said distal pulse wave sensor when said pressure of said cuff is increased at said predetermined rate by said cuff-pressure increasing means;
second peak-interval determining means for determining a second interval between an upper-peak point and a lower-peak point of each of second heartbeat-synchronous pulses of said cuff pulse wave which are detected by said cuff pulse wave sensor when said pressure of said cuff is increased at said predetermined rate by said cuff-pressure increasing means;
difference determining means for determining a difference between the first interval of said each of said first heartbeat-synchronous pulses and the second interval of a corresponding one of said second heartbeat-synchronous pulses; 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 differences determined by said difference determining means significantly largely change. - View Dependent Claims (20)
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Specification