Nihon Kohden Corporation

Yoshihiro Sugo

Takeshi Sohma

Rie Tanaka

Hiromitsu Kasuya

Wenxi Chen

Hidehiro Hosaka

Mitsushi Hyogo

Ryoichi Ochiai

Sunao Takeda

Kohei Ono

Takeshi Akiyama

Keisuke Uchida

Tomoyuki Sakai

Hiroshi Sakata

Mami Sakai

Shigeru Aso

Naoki Kobayashi

Teiji Ukawa

Shin Suda

Hideo Ozawa

Hiroko Hagiwara

Yoshiharu Harada

Takashi Nakaya

Mami Terao

A physiological information processing method includes: acquiring electrocardiogram data of a subject; acquiring pulse wave data of the subject; measuring the heart rate based on the electrocardiogram data; measuring the pulse wave transit time based on the electrocardiogram data and the pulse wave data; calculating a cardiac output based on the pulse wave transit time and heart rate which have been measured; calculating the systemic vascular resistance; and correcting the calculated cardiac output based on the systemic vascular resistance.

Physiological information processing apparatus and physiological information processing method

A physiological information processing method includes: acquiring electrocardiogram data from a subject; acquiring pulse wave data from the subject; measuring a plurality of RR intervals based on the acquired electrocardiogram data; measuring a plurality of pulse wave transit times based on the acquired electrocardiogram data and the acquired pulse wave data; calculating, based on the measured RR intervals and the measured pulse wave transit times during a given time period, a parameter related to correlation between the measured RR intervals and the measured pulse wave transit times; and outputting the calculated parameter.

Physiological information processing apparatus, physiological information processing method, and storage medium

Method for measuring a blood volume is provided. At least two types of respiratory variation data; for instance, data pertinent to respiratory variations in stroke volume (SVV) data, data pertinent to respiratory variations in an amplitude of a pulse wave (PAV), a pulse wave transit time (PWTT) in a respiratory cycle, and a heart rate (HR) in a predetermined time, are measured, and patient's inherent coefficients &#x3b1;, &#x3b2;, and K are calculated, whereby a cardiac output can be determined by an equation CO=K (&#x3b1;*PWTT+&#x3b2;)*HR.

Method and apparatus for measuring blood volume

A biological information monitor includes: a first measuring unit which measures a pulse wave propagation time of a patient; a second measuring unit which measures a blood pressure of the patient; a calculating unit which calculates an estimated blood pressure value of the patient based on the pulse wave propagation time of the patient; a setting unit which sets a threshold; and a determining unit which compares the estimated blood pressure value with the threshold. The second measuring unit is activated to measure the blood pressure of the patient at least one of at time intervals and at a time when an operator operates the second measuring unit, and the second measuring unit is activated to measure the blood pressure of the patient by the determining unit based on the comparison result.

Biological information monitor

A blood volume measuring method, apparatus and program for removing an artifact when used in an apparatus for analyzing respiratory variation of the stroke volume of a patient in order to determine the fluid response of the patient or adequately set artificial ventilation is provided.

Blood volume measuring method and blood volume measuring apparatus

In order to measure a pulse rate and an oxygen saturation of a subject who is in an exercised state, each of two pulse wave signals obtained from the subject is separated into a signal component and a noise component. A frequency spectrum of the signal component and a frequency spectrum of the noise component are obtained. It is judged whether a body motion of the subject is occurred based on the frequency spectrum of the signal component and the frequency spectrum of the noise component. A pulsation frequency is determined based on the judgment as to the body motion. The pulse rate is calculated based on the pulsation frequency. The oxygen saturation is calculated based on a ratio of spectra of the two pulse wave signals corresponding to the pulsation frequency.

Method and apparatus for measuring pulse rate and oxygen saturation achieved during exercise

A method of measuring a blood volume, includes: reading individual specific information of a patient; estimating oxygen metabolism relating to a cardiac output of the patient; and acquiring the cardiac output based on the estimated oxygen metabolism.

An apparatus for measuring a blood volume, includes: a first calculator which calculates a first blood volume by using information on a cardiac output of a subject; and a second calculator which calculates a second blood volume by using information on oxygen metabolism of the subject.

Apparatus for measuring blood volume and method of evaluating result of measurement by apparatus for measuring blood volume

A first member is adapted to measure an electrocardiogram of a patient. A second member is adapted to measure a peripheral pulse wave of the patient. A first calculator calculates a pulse wave propagation time (PWTT) and a heart rate (HR) of the patient based on the electrocardiogram and the peripheral pulse wave. A second calculator calculates a cardiac output (CO) of the patient with an equation of CO=(&#x3b1;K&#xb7;PWTT+&#x3b2;K)&#xb7;HR, where &#x3b1;, &#x3b2; and K are coefficients inherent to the patient.

Method and apparatus for measuring blood volume, and vital sign monitor using the same

A vital sign monitoring apparatus has estimated blood pressure calculation device for calculating estimated systolic blood pressure and estimated diastolic blood pressure from information relevant to blood pressure successively measured based on the relationship between information relevant to blood pressure and systolic blood pressure and the relationship between information relevant to blood pressure and diastolic blood pressure, systolic and diastolic duration measurement device for successively measuring a systolic duration and a diastolic duration, and blood flow volume calculation device for calculating a blood flow volume based on the estimated systolic blood pressure and the estimated diastolic blood pressure successively calculated and the systolic duration and the diastolic duration successively measured.

Blood flow volume measurement method and vital sign monitoring apparatus

A blood pressure monitoring apparatus includes a blood pressure measuring device for measuring blood pressure employing a cuff, a pulse wave propagation time measuring device for measuring the pulse wave propagation time, a hemodynamics measuring device for measuring the hemodynamics, and a control device for controlling the blood pressure measuring device on the basis of a change in pulse wave propagation time measured by the pulse wave propagation time measuring device and a change in hemodynamics measured by the hemodynamics measuring device. The control device controls the blood pressure measuring device to measure the blood pressure on the basis of the amount of change and change trend in the pulse wave propagation time measured by the pulse wave propagation time measuring device, and the amount of change and change trend in the hemodynamics measured by the hemodynamics measuring device.

Blood pressure monitoring apparatus

A pacing-pulse detecting circuit,detects pacing pulses from an electrocardiogram signal led from an electrocardiogram electrode,A mode-status judging means,judges a mode status, a pacing mode or a nonpacing mode, on the basis of the pacing pulse detected. The detect result is transmitted to a CPU,The CPU,causes a display device,to display the result. An operator sees the display and operates a key,and gives an instruction to start a blood pressure measurement to the CPU,The CPU,drives a pump,and an exhaust valve,to supply and discharge air to and from a cuff,and measures a blood pressure by use of pressure data led from a pressure sensor

Patient monitoring apparatus

An apparatus for non-invasion heart monitoring includes electrocardiogram measuring means (1) for measuring electrocardiograms, pulse wave measuring means (2) for measuring pulse waves, and a CPU (30) for processing electrocardiogram signals derived from the electrocardiogram measuring means (1) and pulse wave signals derived from the pulse-wave measuring means (2). The CPU (30) detects the amplitudes of the pulse waves corresponding to the R waves of the cardiogram and the pulse wave propagation times, and computes a ratio (Nr/N) of the heart rate N and the heart rate Nr exclusive of the heart beats of wave deficits.

Non-invasive heart monitoring apparatus and method

A pacing-pulse detecting circuit 3 detects pacing pulses from an electrocardiogram signal led from an electrocardiogram electrode 1. A mode-status judging means 21 judges a mode status, a pacing mode or a nonpacing mode, on the basis of the pacing pulse detected. The detect result is transmitted to a CPU 5. The CPU 5 causes a display device 10 to display the result. An operator sees the display and operates a key 22, and gives an instruction to start a blood pressure measurement to the CPU 5. The CPU 5 drives a pump 13 and an exhaust valve 14 to supply and discharge air to and from a cuff 11, and measures a blood pressure by use of pressure data led from a pressure sensor 15.

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Tokyo, Japan

Yoshihiro Sugo