Blood-pressure monitor apparatus
First Claim
1. A blood pressure monitor apparatus for monitoring a blood pressure of a living subject, by changing a pressing pressure of an inflatable cuff being wound around a body portion of a living subject, comprising:
- a cuff-pressure regulating device which iteratively changes the pressure of said cuff within a predetermined range whose upper limit is lower than a diastolic blood pressure of the subject;
a pulse-wave sensor which detects an amplitude of each of a plurality of heartbeat-synchronous pulses of a pulse wave which is produced in said cuff when said pressure of the cuff is changed within said predetermined range by said regulating device;
characteristic determining means for determining a characteristic value relating to an envelope of the pulse amplitudes detected by said pulse-wave sensor during each of the iterative changes of the pressure of said cuff by said regulating device within said predetermined range; and
identifying means for identifying an abnormal decrease of said blood pressure of the subject based on the characteristic value determined by said characteristic determining means.
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Accused Products
Abstract
A blood pressure monitor apparatus for monitoring a blood pressure of a living subject, by changing a pressing pressure of an inflatable cuff being wound around a body portion of a living subject, including a cuff-pressure regulating device which iteratively changes the pressure of the cuff within a predetermined range whose upper limit is lower than a mean blood pressure of the subject, a pulse-wave sensor which detects an amplitude of each of a plurality of heartbeat-synchronous pulses of a pulse wave which is produced in the cuff when the pressure of the cuff is changed within the predetermined range by the regulating device, a characteristic determining device for determining a characteristic value relating to an envelope of the pulse amplitudes detected by the pulse-wave sensor during each of the iterative cuff-pressure changes within the predetermined range, and a identifying device for identifying an abnormal decrease of the blood pressure of the subject based on the characteristic value determined by the characteristic determining device.
26 Citations
20 Claims
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1. A blood pressure monitor apparatus for monitoring a blood pressure of a living subject, by changing a pressing pressure of an inflatable cuff being wound around a body portion of a living subject, comprising:
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a cuff-pressure regulating device which iteratively changes the pressure of said cuff within a predetermined range whose upper limit is lower than a diastolic blood pressure of the subject; a pulse-wave sensor which detects an amplitude of each of a plurality of heartbeat-synchronous pulses of a pulse wave which is produced in said cuff when said pressure of the cuff is changed within said predetermined range by said regulating device; characteristic determining means for determining a characteristic value relating to an envelope of the pulse amplitudes detected by said pulse-wave sensor during each of the iterative changes of the pressure of said cuff by said regulating device within said predetermined range; and identifying means for identifying an abnormal decrease of said blood pressure of the subject based on the characteristic value determined by said characteristic determining means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A blood pressure monitor apparatus for monitoring a blood pressure of a living subject, by changing a pressing pressure of an inflatable cuff being wound around a body portion of a living subject, comprising;
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a cuff-pressure regulating device which iteratively changes the pressure of said cuff within a predetermined range whose upper limit is lower than a mean blood pressure of the subject; a pulse-wave sensor which detects an amplitude of each of a plurality of heartbeat-synchronous pulses of a pulse wave which is produced in said cuff when said pressure of the cuff is changed within said predetermined range by said regulating device; characteristic determining means for determining a characteristic value relating to an envelope of the pulse amplitudes detected by said pulse-wave sensor during each of the iterative changes of the pressure of said cuff by said regulating device within said predetermined range; and identifying means for identifying an abnormal decrease of said blood pressure of the subject based on the characteristic value determined by said characteristic determining means, wherein said characteristic determining means comprises area-using characteristic determining means for determining said characteristic value based on an area defined by said envelope of said pulse amplitudes and a base line connecting a plurality of cuff pressures corresponding to said pulse amplitudes, respectively.
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20. A blood pressure monitor apparatus for monitoring a blood pressure of a living subject, by changing a pressing pressure of an inflatable cuff being wound around a body portion of a living subject, comprising:
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a cuff-pressure regulating device which iteratively changes the pressure of said cuff within a predetermined range whose upper limit is lower than a mean blood pressure of the subject; a pulse-wave sensor which detects an amplitude of each of a plurality of heartbeat-synchronous pulses of a pulse wave which is produced in said cuff when said pressure of the cuff is changed within said predetermined range by said regulating device; characteristic determining means for determining a characteristic value relating to an envelope of the pulse amplitudes detected by said pulse-wave sensor during each of the iterative changes of the pressure of said cuff by said regulating device within said predetermined range; and identifying means for identifying an abnormal decrease of said blood pressure of the subject based on the characteristic value determined by said characteristic determining means, wherein said cuff-pressure regulating device comprises means for changing the pressure of said cuff to a predetermined first hold value equal to a lower limit of said predetermined range and holding the cuff pressure at said first hold value and changing said cuff pressure to a predetermined second hold value higher than said first hold value and equal to said upper limit of the predetermined range and holding said cuff pressure at said second hold value, and wherein said characteristic determining means determines said characteristic value based on the pulse amplitude detected by said pulse-wave sensor when said cuff pressure is held at said first hold value and the pulse amplitude detected by said pulse-wave sensor when said cuff pressure is held at said second hold value.
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Specification