Nihon Kohden Corporation

Takashi Usuda

Naoki Kobayashi

Kazumasa Ito

Teiji Ukawa

Sunao Takeda

Michio Kanemoto

Ei Nomura

Yoshiaki Takamura

Katsuyoshi Suzuki

Hiroshi Kubo

Yoshinori Ueda

Hidetoshi Dainobu

Toshiki Aoki

Yukio Koyama

Iwao Takahashi

Hideaki Hirahara

Kumi Sugiyama

Yoshiharu Kikuchi

A pressurizing/depressurizing section () performs at least one of air feeding to a cuff () by way of an air way () and air discharging by way of the air way () to thereby increase or decrease an internal pressure of the cuff (). A first controlling section () causes the pressurizing/depressurizing section () to initiate the air feeding while performing the air discharging to thereby cause the internal pressure to transit from a pressure transient state to a pressure steady state or from the pressure steady state to the pressure transient state. A determining section () determines Whether the internal pressure has transited to the pressure steady state by way of the pressure transient state. A second controlling section () causes the pressurizing/depressurizing section () to suppress or stop the air discharging while continuing the air feeding, in accordance with determination made by the determining section ().

Blood pressure measuring apparatus

A pressurizing/depressurizing section () increases or decreases an internal pressure of a cuff (). A first controlling section () controls an operation of the pressurizing/depressurizing section () so as to cause the internal pressure to transit from a pressure transient state to a pressure steady state and vice versa. A detecting section () detects the internal pressure. A storage section () stores control modes ways for increasing/decreasing the internal pressure of which are different. A determining section () determines a type of the cuff () in accordance with whether the detected internal pressure has reached the pressure steady state within a predetermined time period since start of the pressure transient state. A second controlling section () selects one of the control modes in accordance with the determined type of the cuff (), and to control the operation of the pressurizing/depressurizing section () in accordance with the selected one of the control modes.

A blood pressure measurement apparatus includes a pressure controller that controls an internal pressure of a cuff, an oscillation acquiring section that acquires an oscillation corresponding to a pressure vibration, a pulse wave signal acquiring section that acquires a pulse wave signal of the subject from a probe, a processor, and a memory that stores instructions executable by the processor. In the apparatus, when the instructions are executed by the processor, the apparatus causes the pressure controller to inflate the internal pressure, determines whether a first condition is satisfied or not, determines whether a second condition is satisfied or not, and if the first condition and the second condition are satisfied, determines a mean blood pressure of the subject based on the internal pressure.

Blood pressure measurement apparatus

A blood pressure measuring apparatus, which measures a blood pressure of a living body, includes: a cuff-pressure control unit which controls a cuff pressure of a cuff that presses a part of the living body; an oscillation signal detection unit which detects an oscillation signal from the cuff pressure; a blood pressure specification unit which specifies systolic and diastolic blood pressures as the blood pressure of the living body from the oscillation signal; and a blood pressure determination unit which determines whether systolic and diastolic blood pressures are appropriate or not. The cuff-pressure control unit controls the cuff pressure to be inflated to a first set value, the blood pressure specification unit specifies the systolic and diastolic blood pressures based on a change of an oscillation signal that is detected by the oscillation signal detection unit when the cuff pressure is inflated to the first set value, and when the blood pressure determination unit determines that both the systolic and diastolic blood pressures are appropriate, the cuff-pressure control unit ends the inflating of the cuff pressure to release the cuff pressure.

A biological information measuring apparatus and method are provided. A pulsation information detecting unit detects heartbeat information relating to a heartbeat of a subject. A pulse wave detecting unit detects a pulse wave while a portion of the subject is pressurized and depressurized by a cuff. An amplitude calculating unit detects a cardiac cycle of a heart from the heartbeat information and a maximal value of the pulse wave in each cardiac cycle, and calculates, based on the maximal value detected from the pulse wave, at least one of an amplitude value derived from the heartbeat of the subject, an amplitude value assisted by an IABP, and an amplitude value derived from a blood flow volume of the subject. A blood pressure calculating unit calculates a blood pressure value from a relationship between the amplitude values calculated by the amplitude calculating unit and a pressurizing force of the cuff.

Biological information measuring apparatus and biological information measuring method

A COsensor includes: a sensing portion operable to change in color in accordance with a COpartial pressure in expiration from at least one of nares and a mouth of a living body; and a mounting member adapted to hold the sensing portion at a position where the expiration from the at least one of the nares and the mouth impinges on the sensing portion.

[object Object]

A method of calculating a blood pressure, includes: providing a non-invasive blood pressure measurement apparatus which includes a cuff being inflatable and deflatable and adapted to be fitted on a part of a living body and in which a plurality of calculation methods each of which has priority in accordance with a type of noise information are set; detecting, by the cuff, a signal waveform representing a change in an oscillation amplitude and a change in a cuff pressure; determining the type of the noise information contained in the detected signal waveform; deciding the blood pressure from at least one candidate value for the blood pressure, which is calculated by one of the calculation methods that has the priority with respect to the determined type of the noise information; and displaying the decided blood pressure.

Blood pressure calculation method for non-invasive blood pressure measurement apparatus

An apparatus for measuring a concentration of a light-absorbing substance in blood is disclosed. A light emitter emits light beams to irradiate a living tissue, each of the light beams being associated with one wavelength which is absorbed by the blood. A first instrument measures first intensities of the light beams, which are to be incident on the living tissue. A second instrument measures second intensities of the light beams, which are transmitted through the living tissue. A first calculator calculates an attenuation variation ratio, which is a ratio of attenuation variations of the respective light beams due to variation of a volume of the blood caused by pulsation, based on the second intensities of the light beams. A second calculator calculates the concentration based on the first intensities, the second intensities, and the attenuation variation ratio.

Apparatus for measuring concentration of light-absorbing substance in blood

An apparatus for determining concentrations of hemoglobins includes a light source for emitting lights of at least three different wavelengths, a first wavelength in a near-infrared region, a second wavelength in a red region, and a third wavelength in a red orange region, light receiving device for receiving light emitted by the light source, transmitted through a living tissue or reflected by the living tissue, attenuation ratio processing device for processing attenuation ratios between the wavelengths in accordance with variations of received-light output signals in each of the wavelengths output from the light receiving device, the variations are caused by a pulsation of blood and concentration ratio processing device for processing concentration ratios of at least oxyhemoglobin and methemoglobin based on the output signals from the attenuation ratio processing device.

Apparatus for determining concentrations of hemoglobins

An apparatus for determining concentrations of hemoglobins additionally uses a light source which emits light of a third wavelength in an orangy red wavelength region of 590 to 660 nm. The apparatus includes light receiving means for receiving lights that are emitted by the light sources and transmitted through or reflected by a living tissue, attenuation ratio processing means for processing attenuation ratios &PHgr; on the wavelengths based on variations of signals associated with the wavelengths output from the light receiving means, which variations are caused by a pulsation of blood, and concentration ratio processing means for processing concentration ratios of at least oxyhemoglobin, deoxyhemoglobin and carboxyhemoglobin based on the output signals from the attenuation ratio processing means. The apparatus thus constructed can properly measure carboxyhemoglobin COHb, and present its concentration display and an alarm display in a simple manner, which is clinically effective.

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Tokyo, Japan

Takashi Usuda