JPH0663024A - Instrument for simultaneous and continuous bloodless measurement of blood pressure and degree of oxygen saturation in blood - Google Patents

Abstract

PURPOSE:To simultaneously and continuously measure a blood pressure and degree of oxygen saturation in blood. CONSTITUTION:This instrument has two light sources 1, 2 which generate light rays of the wavelengths different from each other, an optical sensor means which has a photodetector 3 for detecting the light transmitted through or reflected from the section to be measured of a living body, a cuff 5 which has this optical sensor means, a cuff pressure controller 7 which controls the pressure to be applied to this cuff 5, a volume signal detection part 9 which separates the volume signals of the respective wavelengths from the light quantity signals detected by the optical sensor part, a pressure sensor 15 which detects the cuff pressure and a control section 17 which determines the blood pressure value in accordance with the pulsation component of the one volume signal and the cuff pressure and determines the degree of oxygen saturation in blood from the volume pulsation signal extracted from the pulsation components of the respective volume signals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-invasive blood pressure and blood oxygen saturation simultaneous continuous measuring apparatus for simultaneously and continuously measuring blood pressure and blood oxygen saturation.

[0002]

2. Description of the Related Art Conventionally, in order to continuously measure blood pressure and blood oxygen saturation, a dedicated non-invasive blood pressure measuring device and blood oxygen saturation measuring device have been used respectively, and a sensor for each subject has been used. I am trying to measure by wearing.

In blood pressure measurement, for example, a tonometry method or a volume compensation method is known. In the tonometry method, when external pressure is applied to the blood vessel wall to flatten it, the radius of curvature of the blood vessel wall becomes infinite and the circumferential stress can be ignored.
At this time, the external pressure measured on the blood vessel wall indicates the intravascular pressure acting perpendicularly to the blood vessel wall, so that the blood pressure is continuously measured.

A volume compensation method is disclosed in Japanese Patent Laid-Open No. 54-5017.
5 and Japanese Patent Publication No. 1-31370,
The outline is as follows. That is, JP-A-54-50
Reference numeral 175 relates to a device for measuring the total fluctuation state of the systolic blood pressure, the diastolic blood pressure and the blood pressure waveform by a volume compensation method using an optical sensor. The external pressure is applied to the blood vessel from outside the body to measure the volume per unit length of the pulsating blood vessel. By keeping the pressure constant, the in vitro pressure and the blood vessel pressure (blood pressure) are equilibrated, and the in vitro pressure is measured while maintaining this state to continuously measure the blood pressure.

Japanese Patent Publication No. 1-31370 discloses the above-mentioned Japanese Patent Application Laid-Open No. 54-54.
This is a modified version of -50175. External pressure is applied to the artery at the site to be measured via the cuff, and control is performed so that the blood pressure in this artery and the cuff pressure are matched, and the cuff when the blood pressure and the cuff pressure match. The pressure is displayed as blood pressure, and the blood pressure is continuously and fully automatically measured.

On the other hand, in measuring blood oxygen saturation, a measuring method applying optical means is disclosed in Japanese Examined Patent Publication No. 53-26437.
Is disclosed in. The outline is to continuously measure the blood oxygen saturation level by detecting a change in the absorbance of transmitted light in, for example, two kinds of light wavelength bands with the pulsation of arterial blood.

[0007]

[Problems to be Solved by the Invention] However, in the past,
To continuously measure blood pressure and blood oxygen saturation,
A dedicated non-invasive blood pressure continuous measuring device and a blood oxygen saturation continuous measuring device were used respectively, and each subject was equipped with a dedicated sensor for measurement. Therefore, there is a problem that it takes time to prepare for the measurement and the measurement cannot be performed at the same side site of the subject due to the interference between the measuring devices. In addition, wearing a large number of sensors poses a problem of placing a heavy burden on the subject. In view of such a point, the present invention provides a non-invasive blood pressure and blood oxygen saturation simultaneous continuous measuring device capable of simultaneously and continuously measuring blood pressure and blood oxygen saturation without imposing a burden on a subject. With the goal.

[0008]

A non-invasive blood pressure and blood oxygen saturation simultaneous continuous measuring apparatus of the present invention comprises a plurality of light sources 1 for generating light having different wavelengths, as shown in FIG. 1, for example.
2, a light sensor means including a light receiving element 3 for detecting transmitted light or reflected light of a measured portion of a living body from the light sources 1 and 2, a cuff 5 including the light sensor means, and a cuff 5 added to the cuff 5. Cuff pressure control means 7 for controlling pressure, volume signal detection means 9 for separating volume signals of respective wavelengths from light amount signals detected by the optical sensor means, pressure detection means 15 for detecting cuff pressure, and one of The control means 17 determines the blood pressure value based on the pulsating component of the volume signal and the cuff pressure, and determines the blood oxygen saturation level from the volume pulsating wave signal extracted from each pulsating component of the volume signal.

The blood oxygen saturation can be measured by using the plethysmogram signal detected during continuous blood pressure measurement.

[0010]

The two light sources having different wavelengths irradiate the measured portion of the living body, and the transmitted light or reflected light is received and output as a light amount signal. The light quantity signal is separated into respective wavelengths in the volume signal detection section, the corresponding volume signal is obtained, and the volume pulse wave signal is extracted by the control section based on this volume signal.

During blood pressure measurement, the volume signal of one light source that emits near-infrared light, which is less susceptible to the redox reaction of blood, is used, and the corresponding volume pulse wave signal is detected to maximize its amplitude. The cuff pressure is calculated, and then the volume pulse wave signal is controlled to be zero, and the cuff pressure at the time of zero or when it becomes extremely small is obtained as a continuous blood pressure curve of the measurement site. Maximum blood pressure value from the maximum and minimum values of this blood pressure curve,
The average blood pressure value is obtained from the minimum blood pressure value and the time area of one heartbeat of the blood pressure curve and the pulse wave interval, and the maximum or minimum value interval of the blood pressure curve is converted into unit time to obtain the instantaneous pulse rate.

Further, when measuring the blood oxygen saturation level, the two volume pulse wave signals detected at the time of blood pressure measurement are used to calculate the change amount of each volume pulse wave signal per fixed time, and
The ratio of this change is calculated. From the calculated ratio of the plethysmogram signals, the blood oxygen saturation is read out by referring to a preset blood oxygen saturation comparison table. Alternatively, the blood oxygen saturation level is obtained by calculation from the ratio of the plethysmogram signal and the absorption coefficient of oxyhemoglobin and deoxyhemoglobin.

By doing so, the volume pulse wave signal detected at the time of blood pressure measurement can be used, and the blood pressure and the blood oxygen saturation can be measured simultaneously and continuously by one sensor.

[0014]

EXAMPLES Examples of the simultaneous non-invasive blood pressure and blood oxygen saturation continuous measuring apparatus of the present invention will be described below with reference to FIGS.

The principle of the present invention focuses on the fact that it is not necessary to completely eliminate the volume pulse wave signal detected during volume compensation by continuously measuring blood pressure by the volume compensation method using an optical sensor. By using a plurality of wavelengths of the light source for measuring the volume pulse wave signal, for example, two kinds of wavelengths, spectroscopic analysis is performed on the volume pulse wave signal to measure the blood oxygen saturation. Therefore, the optical sensor can be used for both non-invasive blood pressure and blood oxygen saturation measurement, and blood pressure waveform, systolic blood pressure, mean blood pressure, diastolic blood pressure, instantaneous pulse rate and blood oxygen saturation can be continuously and simultaneously measured. Become.

When the above-mentioned blood oxygen saturation is calculated, the Bale-Lambert (B
eer-Lambert's law is used.

As shown in FIG. 6, the light emitted from the light source passes through the tissue layer, the venous blood layer (vein) and the arterial blood layer (artery). Since the thickness (d) of the arterial blood layer changes with the pulsation, the transmitted light is also affected by the change, and the change in absorbance in a state where the thickness of the arterial blood layer changes is obtained.

In the present invention, since light sources having different wavelengths are used, for example, the wavelength of the light source 1 is λ ₁ and the light source 2 is 2.
The wavelength of λ ₂ is set to λ ₂ and the absorbance when the arterial blood layer is maximum and minimum for each wavelength is obtained. Next, the difference in absorbance (ΔAλ ₁ and ΔA) of the wavelengths (λ ₁ and λ ₂ ) of the light sources 1 and 2
The blood oxygen saturation is obtained by calculating λ ₂ ) and calculating their ratio.

That is, since the total hemoglobin (Hb) concentration C in the artery at the target measuring portion is C = C _Hb + C _Hbo , the blood oxygen saturation OS is OS = C _Hbo / C. Therefore, the ratio of the difference in the absorbance of each wavelength is as follows.

[0020]

[Equation 1]

From this equation (1), the oxygen saturation OS is

[0022]

[Equation 2]

Is calculated as In this case, if the wavelength (λ ₂ ) of the light source 2 is selected as an isosbestic point (for example, wavelength 805 nm),

[0024]

[Equation 3]

Therefore, Equation 2 is

[0026]

[Equation 4]

[0027] In the embodiment of the present invention, the blood oxygen saturation level is obtained by this equation (4).

Where ε _{Hb is} the extinction coefficient of reduced hemoglobin (Hb), ε _{Hbo is} the extinction coefficient of oxyhemoglobin (H _bo ), C _{Hb is} the H _b concentration of arterial blood, and C _{Hbo is} the H _bo concentration of arterial blood. It is a thing.

In the present invention, the ratio (δS _g1 / δS) of the changes δS _g1 and δS _g2 of the volume pulse wave signal per constant time based on the transmitted or reflected light from the light sources 1 and 2 described below, respectively.
_The oxygen saturation is calculated using _g2 ) as the absorbance ratio. This corresponds to the absorbance ratio for each wavelength in Equation 1.

FIG. 1 shows the construction of the non-invasive blood pressure and blood oxygen saturation simultaneous simultaneous measuring apparatus of the present invention. In FIG. 1, 1 and 2 are light sources such as light emitting diodes which emit light of different wavelengths, and the light source 1 is a wavelength sensitive to redox reaction of blood, for example, a wavelength (λ ₁ ) around 660 nm (nanometer). , And the light source 2 emits near-infrared light having a wavelength that is less affected by the redox reaction of blood, for example, a wavelength (λ ₂ ) near 805 nm, which is an isosbestic point. In the present invention, the blood pressure is measured by using the light source 2 which is not easily affected by the redox reaction of blood.

Reference numeral 3 is a light receiving element in a wide wavelength band, which is composed of, for example, a phototransistor or a photodiode.
2 and 2, through the measurement site of the living body, the transmitted light or the reflected light that changes according to the pulsation of the blood vessel of the measurement site is received and converted into a light amount signal. The light sources 1 and 2 and the light receiving element 3
Is an optical sensor unit and is attached so as to face a predetermined position of the cuff 5 described later.

Reference numeral 4 denotes a light source driving section for driving the light sources 1 and 2, and alternately drives the light sources 1 and 2 at a predetermined cycle under the control of a control section 17 described later.

Reference numeral 5 denotes a cylindrical cuff to be attached to a measurement site such as a finger, which applies external pressure such as air pressure to the measurement site. The inner wall 5a is formed of, for example, an elastic thin film of silicon rubber or the like, and is in close contact with the measurement site. As described above, the cuff 5 includes the optical sensor section including the light sources 1 and 2 and the light receiving element 3.

Reference numeral 6 is an air pump for sending air into the pipe Tu to the cuff 5, and the pressure applied to the cuff is adjusted by a cuff pressure controller 7 including, for example, an adjusting valve.

Reference numeral 9 denotes a volume signal detector for obtaining a volume signal from the light amount signal of the light receiving element 3 amplified by the amplifier 8.
It is configured as follows.

Reference numerals 10 and 11 are sample-hold circuits.
The output signal of the amplifier 8 is sampled and held by the switching signals SW1 and SW2 output from the control unit 17 which will be described later and synchronized with the light sources 1 and 2, respectively. Therefore, the light quantity signals of the light sources 1 and 2 are output from the sampling and holding circuits 10 and 11 as volume signals S _v1 and S _v2 corresponding to the volume of the blood vessel in the measured portion, respectively. The volume signals are separated by alternately driving the light sources 1 and 2 and applying the switching signals SW1 and SW2 as sample signals in synchronization with the driving.

Reference numerals 12 and 13 denote the sample and hold circuit 1.
For example, it is a DC amplifier that amplifies the volume signals S _v1 and S _v2 at the respective wavelengths output from 0 and 11, and the DC component of the output voltage can be arbitrarily increased or decreased by the offset voltages V1 and V2 output from the control unit 17. It is like this. In this case, when the amplitudes of the volume signals S _v1 and S _v2 exceed the preset input range of the AD converter 14 (described later), the offset voltages V1 and V2 are changed and the volume signals S _v1 or S _v2 are changed. The amplitude is controlled so that it falls within a predetermined input range.

Reference numeral 14 is an AD converter, which inputs the volume signals amplified by the DC amplifiers 12 and 13, converts them into digital signals, and outputs them to the control unit 17.

Reference numeral 15 is a pressure sensor for detecting the pressure Pc of the cuff 5, which is composed of, for example, a pressure transducer, the output signal of which is amplified by an amplifier 16 and supplied to the A / D converter 14 as a cuff pressure signal. .

Reference numeral 17 denotes a control unit, which has a microcomputer configuration, for example, and has an input / output control device (I / O) 18 and a CP.
Display unit 2 such as U19, ROM20, RAM21 and CRT
2, an interface section 23 and an operation section 24 such as a keyboard.

The CPU 19 controls the entire apparatus, and based on a processing program stored in the ROM 20 in advance, the volume pulse wave signals S _g1 and S _{g1 are obtained} from the volume signals S _v1 and S _v2 separated by the volume signal detector 9. Detect _g2 and calculate blood pressure (maximum, average, diastolic blood pressure), instantaneous pulse rate and blood oxygen saturation.

Further, the ROM 20 stores in advance a constant determined by the absorption coefficients of oxyhemoglobin and reduced hemoglobin necessary for measuring blood oxygen saturation and a blood oxygen saturation comparison table for the volume pulse wave signal ratio. ing.

The RAM 21 temporarily stores and holds the volume pulse wave signal detected by the CPU 19, a required cuff pressure value, setting data or calculation data. The display unit 22 displays data such as the obtained blood pressure waveform, blood pressure value or blood oxygen saturation on the screen. The interface unit 23 transfers measurement data to other monitors or patient monitoring devices, or inputs data from these devices. The operation unit 24 is for performing various data settings and function settings.

Next, the flowcharts of FIGS. 2 to 4 and FIG.
The processing operation of the embodiment having the above-described configuration will be described with reference to the waveform diagram of FIG. First, the case of measuring blood pressure will be described. In this case, as described above, the volume signal S _v2 obtained based on the light source 2 having a wavelength that is hardly affected by the redox reaction of blood is used.

The power is turned on, and a finger to be measured, such as a finger, is inserted into the cuff 5. The control unit 17 supplies a drive signal to the air pump 6 via the cuff pressure controller 7 to drive it.
The target value (PCm
) Linearly increases as shown in FIG. 5A (step S101). In this case, the cuff pressure Pc is detected by the pressure sensor 15 and is constantly monitored by the CPU 19 of the control unit 17. As the cuff pressure Pc increases, the volume signal S _v2 output from the sample hold circuit 11 also gradually increases as shown in FIG. 5B. Further, as shown in FIG. 5C, the volume signal S _v2
Therefore, the amplitude of the volume pulse wave signal S _g2 detected by the CPU 19 also gradually increases.

The control unit 17 detects whether or not the amplitude of the volume pulse wave signal S _g2 has become maximum (step S102), and when it is not maximum, this processing is repeated, and when it has become maximum, the process proceeds to the next step S103. .

In the volume compensation method, when the cuff pressure Pc is equal to the intravascular pressure, the amplitude of the volume pulse wave signal becomes maximum. Therefore, the cuff pressure Pc at this time is detected as the servo initial pressure SPc and the volume signal S _v2 is detected. Average reference level ST
It is obtained as D (step S103). The servo initial pressure SPc and the control reference value STD are stored in the RAM 21.

The control unit 17 outputs a control signal for further increasing the cuff pressure Pc to the cuff pressure controller 7. The volume pulse wave signal S _g2 gradually decreases as the cuff pressure increases, and finally becomes 0 or becomes very small, and the control unit 17 detects this (step S104). If it is not 0, this processing is repeated until it approaches 0 or 0. If the volume pulse wave signal S _g2 becomes 0 or almost 0, the routine proceeds to step S105. In step S105, control is performed to linearly reduce the pressure until it becomes equal to the servo initial pressure SPc detected in step S103.

The control unit 17 determines that the cuff pressure Pc is the servo initial pressure S.
When it becomes equal to Pc (step S106), the offset voltage V2 is output to the DC amplifier 12 of the volume signal detector 9 (step S107), and the input of the A / D converter 14 in which the amplitude of the volume signal _Sv2 is preset. It is controlled so as to fall within the range (step S108).

In step S109, the control section 17 determines the control reference value STD and the volume signal S detected in step S103.
_The difference signal ΔST is detected by taking the difference from _v2, and the control signal is fed back to the cuff pressure controller 7 so that the difference signal ΔST becomes zero. The control unit 17 sets the amplitude of the volume pulse wave signal S _g2 to a preset level, eg, −15 with respect to the amplitude of the volume pulse wave signal S _{g2 at} the servo initial pressure SPc.
It is determined whether or not the attenuation is below dB (step S110).

When the volume pulse wave signal S _g2 is attenuated to -15 dB or less, the control unit 17 obtains the maximum value of the cuff pressure Pc as the maximum blood pressure and the minimum value as the minimum blood pressure from the blood pressure curve obtained by the above process ( Step S111), this data is RA
It is stored in M21 and displayed on the display unit 22 or output from the interface unit 23 to the patient monitoring device or the like.

Further, the control unit 17 obtains a value obtained by dividing the time area of one heartbeat during continuous blood pressure measurement by the pulse wave interval from the blood pressure curve as the average blood pressure (step S112), and transfers this data to the RAM 21 for storage. At the same time, it is displayed on the display unit 22 or output from the interface unit 23 to a patient monitoring device or the like.

Further, the interval between peak points indicating, for example, the systolic blood pressure of the blood pressure curve is measured, and converted into a unit time of, for example, one minute to obtain an instantaneous pulse rate (step S113).

When the instantaneous pulse rate is obtained, it is judged whether or not an end command has been issued (step S114). If the end command has been issued, the blood pressure measurement is ended, and if not ended, the process proceeds to step S111. Return The above process is repeated.

In this way, the maximum, minimum, average blood pressure value and instantaneous pulse rate can be continuously obtained.

In the blood pressure measurement described above, the light amount signal of the light source 1 is not used for blood pressure measurement, but the light amount of the light source 2 is controlled by the sample hold circuit 10, the DC amplifier 12, the AD converter 14 and the controller 17. At the time of the signal processing operation, the volume signal S _v1 and the volume pulse wave signal S _g1 corresponding to the light amount signal of the light source 1 are also obtained at the same time and used for measuring the blood pressure oxygen saturation level.

Next, when measuring blood oxygen saturation,
A description will be given with reference to the flowchart of FIG. This place
When the blood pressure is measured, the volume pulse wave signal S detected_g1Over
And S _g2To use.

The control unit 17 determines whether the measurement mode is the blood pressure measurement mode (step S201), and in the case of the blood pressure measurement mode, calculates the change δS _g1 of the volume pulse wave signal S _g1 per predetermined time ( Step S202). Similarly, the change δS _g2 of the volume pulse wave signal S _g2 per predetermined time is calculated (step S203).

The control unit 17 controls the volume pulse wave signals S _g1 and S _g2 calculated in step S202 and step S203, respectively.
Of the change δS _g1 and δS _g2 per predetermined time (δS _g1
/ ΔS _g2 ), that is, the absorbance ratio is obtained, and the corresponding blood oxygen saturation is read from the blood oxygen saturation comparison table stored in advance in the ROM 20 and displayed on, for example, the screen of the display unit 22. Alternatively, blood oxygen saturation is obtained by calculating from the above-mentioned formula (3) from the absorbance ratio (δS _g1 / δS _g2 ) and the absorption coefficients of oxyhemoglobin and reduced hemoglobin (step S204).

When the blood oxygen saturation is calculated, it is judged whether the measurement is completed (step S205). If the measurement is completed, the measurement is completed. If not completed, the process returns to step S202 to repeat the above process.

By using the two plethysmogram signals detected during the blood pressure measurement as described above, the blood pressure and the blood oxygen saturation level can be simultaneously and continuously measured by the same sensor at the same side of the living body.

In the above embodiment, the control reference value and the difference signal of the volume pulse wave signal are obtained by the processing program when measuring the blood pressure, but this can be obtained by hardware.

FIG. 7 shows an essential part of such another embodiment. The difference from the above-mentioned embodiment is that a phase compensator 25 is provided between the output side of the DC amplifier 13 and the cuff pressure controller 7. It is a point. The other parts are the same as those in the above-described embodiment, and thus the duplicated description will be omitted.

In FIG. 7, after the cuff pressure Pc is set to the servo initial pressure SPc, the control signal of the cuff pressure controller 7 is input from the phase compensator 25 instead of the control unit 17. Since the DC amplifier 13 also has the function of removing the DC component based on the offset voltage from the control unit 17, in this case, the DC amplifier 13 obtains the difference signal _ΔST between the volume signal S _v2 and the control reference value STD, and this difference signal △ ST
Is output to the phase compensator 25, and the A-D converter 14
Output to.

The phase compensator 25 shifts the phase of the differential signal ΔST and supplies it to the cuff pressure controller 7, and the differential signal ΔST
Control the cuff pressure so that ST becomes 0.

Further, in the above-mentioned embodiment, the case where the cylindrical cuff utilizing the air pressure is used has been described, but it is also possible to construct it in another shape as shown in FIG.

FIG. 8A shows a disk-shaped configuration in which, for example, two types of light sources 1 and 2 integrally formed and a light receiving element 3 are arranged at predetermined positions such as an elastic thin film.

FIG. 8B shows a plate-shaped cuff, which includes the light sources 1, 2
The configuration of the light receiving element 3 is the same as that of the example of FIG. 8A.

FIG. 8C is a small arm band-shaped cuff, and the light sources 1 and 2 and the light receiving element 3 are arranged in the same manner as in the example of FIGS. 8A and 8B.

The arrangement of the light sources 1 and 2 and the light receiving element 3 arranged in these cuffs is adapted to detect not the transmitted light of the blood vessel of the measured portion but the reflected light. By using these cuffs, blood pressure and blood oxygen saturation of not only the finger but also the superficial temporal artery of the head, the radial artery of the wrist, the dorsalis pedis artery of the foot can be measured.

Further, the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.

[0072]

As described above, according to the present invention, in the conventional non-invasive blood pressure measurement, the blood pressure is stopped or markedly inhibited because the upper arm is compressed by the cuff, and blood in the peripheral region on the same side is stopped. It was impossible to measure oxygen saturation at the same time, but blood pressure and blood oxygen saturation can be measured at the same side at the same time. Further, compared to the conventional measurement using a blood pressure measuring device and a blood oxygen saturation measuring device, the blood pressure and the blood oxygen saturation are simultaneously measured by one set of sensors without the need for dedicated sensors and measuring devices, respectively. Therefore, it is possible to reduce the burden on the person to be measured and also reduce the device cost.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a simultaneous non-invasive blood pressure and blood oxygen saturation simultaneous measurement apparatus of the present invention.

FIG. 2 is a flowchart showing a part of processing operation of blood pressure measurement in the embodiment of the present invention.

FIG. 3 is a flowchart following FIG.

FIG. 4 is a flowchart showing a processing operation of blood oxygen saturation measurement according to the embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a relationship among a cuff pressure, a volume and a volume pulse wave signal in the embodiment of the present invention.

FIG. 6 is an explanatory diagram showing the measurement principle of blood oxygen saturation.

FIG. 7 is a block diagram showing a main part of another embodiment of the present invention.

FIG. 8 is a schematic view showing another configuration of the cuff used in the present invention.

[Explanation of symbols]

1, 2 Light source 3 Light receiving element 5 Cuff 7 Cuff pressure controller 9 Volume signal detector 17 Pressure sensor 19 Controller S _v1 , S _v2 Volume signal

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Claims (2)

[Claims] 1. An optical sensor means comprising a plurality of light sources for generating light having different wavelengths, and a light receiving element for detecting transmitted light or reflected light of a measurement site of a living body from the light sources, and the optical sensor means. A cuff provided, a cuff pressure control means for controlling a pressure applied to the cuff, a volume signal detecting means for separating a volume signal of each wavelength from a light amount signal detected by the optical sensor means, and the cuff pressure A pressure detecting means for detecting the blood pressure value based on the pulsating component of the volume signal and the cuff pressure on the one hand, and the blood oxygen saturation level from the pulsating pulse wave signal extracted from the pulsating component of each of the volume signals. A non-invasive blood pressure and blood oxygen saturation simultaneous simultaneous measuring device, characterized by comprising: 2. The non-invasive blood pressure and blood according to claim 1, wherein the blood oxygen saturation level is obtained by using a volume pulse wave signal detected as a servo error during continuous blood pressure measurement based on the volume compensation method. Simultaneous continuous measurement system of oxygen saturation.