Peripheral blood-flow condition monitor
First Claim
1. An apparatus for monitoring a peripheral blood-flow condition of a living subject by detecting a peripheral blood-flow resistance of the subject, comprising:
- a first and a second pulse-wave sensor which are adapted to be worn on a first and a second portion of the subject, respectively, to detect a first and a second pulse wave, respectively, each of which is produced in synchronism with a heartbeat of the subject;
phase-difference determining means for determining a difference of respective phases of said first and second pulse waves detected by said first and second pulse-wave sensors;
peripheral blood-flow resistance determining means for determining said peripheral blood-flow resistance of the subject, based on the phase difference determined by said phase-difference determining means, according to a predetermined relationship between peripheral blood-flow resistance and phase difference; and
a blood pressure measuring device which measures a blood pressure of the subject, and wherein said peripheral blood-flow resistance determining means determines said peripheral blood-flow resistance of the subject, based on the phase difference determined by said phase-difference determining means and the blood pressure measured by said blood pressure measuring device, according to said predetermined relationship defined by a function of phase difference and blood pressure as variables.
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Accused Products
Abstract
An apparatus for monitoring a peripheral blood-flow condition of a living subject by detecting a peripheral blood-flow resistance of the subject, including a first and a second pulse-wave sensor which are adapted to be worn on a first and a second portion of the subject, respectively, to detect a first and a second pulse wave, respectively, each of which is produced in synchronism with a heartbeat of the subject, a phase-difference determining device for determining a difference of respective phases of the first and second pulse waves detected by the first and second pulse-wave sensors, and a peripheral blood-flow resistance determining device for determining the peripheral blood-flow resistance of the subject, based on the phase difference determined by the phase-difference determining device, according to a predetermined relationship between peripheral blood-flow resistance and phase difference.
60 Citations
12 Claims
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1. An apparatus for monitoring a peripheral blood-flow condition of a living subject by detecting a peripheral blood-flow resistance of the subject, comprising:
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a first and a second pulse-wave sensor which are adapted to be worn on a first and a second portion of the subject, respectively, to detect a first and a second pulse wave, respectively, each of which is produced in synchronism with a heartbeat of the subject; phase-difference determining means for determining a difference of respective phases of said first and second pulse waves detected by said first and second pulse-wave sensors; peripheral blood-flow resistance determining means for determining said peripheral blood-flow resistance of the subject, based on the phase difference determined by said phase-difference determining means, according to a predetermined relationship between peripheral blood-flow resistance and phase difference; and a blood pressure measuring device which measures a blood pressure of the subject, and wherein said peripheral blood-flow resistance determining means determines said peripheral blood-flow resistance of the subject, based on the phase difference determined by said phase-difference determining means and the blood pressure measured by said blood pressure measuring device, according to said predetermined relationship defined by a function of phase difference and blood pressure as variables. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for monitoring a peripheral blood-flow condition of a living subject by detecting a peripheral blood-flow resistance of the subject, comprising:
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a first and a second pulse-wave sensor which are adapted to be worn on a first and a second portion of the subject, respectively, to detect a first and a second pulse wave, respectively, each of which is produced in synchronism with a heartbeat of the subject; phase-difference determining means for determining a difference of respective phases of said first and second pulse waves detected by said first and second pulse-wave sensors; peripheral blood-flow resistance determining means for determining said peripheral blood-flow resistance of the subject, based on the phase difference determined by said phase-difference determining means, according to a predetermined relationship between peripheral blood-flow resistance and phase difference; and index-value determining means for determining an index value indicative of a characteristic of a waveform of a decreasing portion of a heartbeat-synchronous pulse of said second pulse wave detected by said second pulse-wave sensor, wherein said peripheral blood-flow resistance determining means comprises correcting means for correcting, based on said index value determined by said index-value determining means, said peripheral blood-flow resistance determined based on said phase difference determined by said phase-difference determining means. - View Dependent Claims (10, 11, 12)
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Specification