JP2002010988A - Bioelectric impedance measurement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bioelectric impedance measurement device capable of accurately measuring a bioelectric impedance without measurement errors without the danger of dropping the device during measurement. SOLUTION: This bioelectric impedance device of a type to be used by arranging the palms of both hands so as to almost face each other with a prescribed interval and lifting it with both hands is provided with a pair of thumb insertion holes 22a and 22b for inserting the thumbs of both hands, a pair of electrodes 23a and 23b for the thumbs where the inserted thumbs of both hands are to be brought into contact and arranged, a pair of the electrodes 24a and 24b for the palms were the palms of both hands are to be brought into contact and arranged, an AC current supply means for supplying an AC current to either one of the pair of the electrodes for the thumbs and the pair of the electrodes for the palms, a voltage measurement means for measuring a voltage between the other pair of the electrodes and an arithmetic means for computing the bioelectric impedance based on the supplied AC current and the measured voltage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bioelectric impedance measuring apparatus for measuring bioelectric impedance or body fat, body water, pulse, blood pressure, etc. together with bioelectric impedance. The bioelectrical impedance measuring device of the type which is arranged so as to face each other at an interval and lifted up with both hands for use.

[0002]

2. Description of the Related Art Conventionally, a bioelectrical impedance measuring apparatus of this type is provided with a pair of grip portions 11a and 11b as shown in FIG.
a and 11b have a pair of measurement current application electrodes 12a and 12b.
There is known a hand-only electrode type 10 having a pair of electrodes b and a pair of measurement current applying electrodes 13a and 13b. When measuring the bioelectrical impedance using the bioelectrical impedance measuring device 10, the subject is
Hold the pair of grip portions 11a and 11b with both hands so that the palms of both hands face each other at a predetermined interval,
The bioelectrical impedance measuring device 10 is lifted with both hands so that the fingers of both hands are brought into contact with the pair of measurement current application electrodes 12a and 12b and the pair of voltage measurement electrodes 13a and 13b. The measurement is made by extending the body horizontally.

[0003]

In this conventional bioelectrical impedance measuring apparatus, the positions and directions of both hands holding the grip are not fixed, so that the measuring posture fluctuates between or during measurements. There is a problem that bioelectric impedance cannot be measured accurately.

In addition, since the measurement is carried out by bringing both hands, especially fingers, into contact with the electrodes, the contact area between them is small, and the contact resistance at this portion becomes large. Therefore, there is another problem that the bioelectric impedance cannot be measured accurately. there were.

Furthermore, since the bioelectrical impedance measuring device is grasped with both hands, especially fingers, unnecessary force is applied to the indirect part of the wrist or the arm, and a measurement error occurs. There is also a problem that the impedance measuring device is dropped.

Accordingly, an object of the present invention is to provide a bioelectrical impedance measuring apparatus which can solve the above-mentioned problems, can measure the bioelectrical impedance accurately without a measurement error, and does not have a risk of dropping the apparatus during the measurement. To provide.

[0007]

According to one aspect of the present invention, there is provided a bioelectrical impedance measuring apparatus of the type in which the palms of both hands are arranged so as to face each other at a predetermined interval, and are used by lifting with both hands. , A pair of thumb insertion holes into which the thumbs of both hands are inserted, a pair of thumb electrodes in which the thumbs of both hands inserted into the pair of thumb insertion holes are placed in contact, and the palms of both hands in contact with each other A pair of palm electrodes, an alternating current supply unit for supplying an alternating current to the pair of thumb electrodes, a voltage measuring unit for measuring a voltage between the pair of palm electrodes, and the supplied alternating current. And a calculating means for calculating bioelectric impedance based on the measured voltage and the measured voltage.

According to another aspect of the present invention, in a bioelectrical impedance measuring apparatus of the type in which the palms of both hands are arranged so as to face each other at a predetermined interval and lifted up with both hands, the thumbs of both hands are used. A pair of thumb insertion holes to be inserted, a pair of thumb electrodes in which the thumbs of both hands inserted in the pair of thumb insertion holes are arranged in contact, and a pair of palms in which the palms of both hands are arranged in contact AC electrode, AC current supply means for supplying AC current to the pair of palm electrodes, voltage measuring means for measuring the voltage between the pair of thumb electrodes, and the supplied AC current which is measured. And a calculating means for calculating a bioelectric impedance based on the voltage and the bioelectric impedance.

According to one aspect of these inventions, the bioelectrical impedance measuring device is shaped and sized to be lifted by the palms of both hands.

According to another aspect of the present invention, the calculating means further calculates at least one of body fat, body water, pulse, and blood pressure.

According to still another aspect of the present invention, the AC current supply means supplies AC currents of a plurality of different frequencies, the voltage measurement means measures a voltage corresponding to the AC current of each frequency, and the arithmetic means Calculates the bioelectrical impedance based on the supplied alternating currents of different frequencies and the voltages measured corresponding thereto, or the alternating current supply means supplies a single frequency alternating current, The voltage measuring means further measures the phase of the measured voltage, and the calculating means further calculates the phase difference between the supplied current and the measured voltage.

According to yet another aspect of the present invention, the calculating means comprises: an intracellular fluid amount to an extracellular fluid ratio, an extracellular fluid amount to a body water fluid ratio, an intracellular fluid amount, an extracellular fluid amount, At least one of the amount of water and the amount of body fat is further calculated.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a perspective view showing an external configuration of one embodiment of the bioelectrical impedance measuring device according to the present invention. The measuring device 20 has a shape and a size such that the palms of both hands are arranged so as to face each other at a predetermined interval and can be lifted by the palms of both hands, and as shown in FIG. Box-shaped housing 2
1 is provided. A left thumb insertion hole 22a penetrating substantially linearly from the upper left portion of the front surface of the housing 21 to the upper left portion of the rear surface of the housing 21 is provided on the left portion of the housing 21.
A cylindrical left thumb electrode 23a, which extends over the entire peripheral wall of the left thumb insertion hole 22a and has both end surfaces opened, and a left thumb insertion hole 22a;
And a left palm electrode 24a extending on the left side of the housing 21 below the left side. Similarly, housing 2
A right thumb insertion hole 22b penetrating in a substantially straight line from the upper right portion of the front surface of the housing 21 to the upper right portion of the rear surface of the housing 21 is provided on the right portion of the housing 21, and the right thumb insertion hole 22b is extended over the entire peripheral wall to open both end surfaces. Cylindrical right thumb electrode 23b
And a right palm electrode 24b extending on the right side of the housing 21 below the right thumb insertion hole 22b. The left thumb electrode 23a and the right thumb electrode 23b are 1
A pair of thumb electrodes 23a and 23b are formed. Similarly, the left palm electrode 24a and the right palm electrode 24b
The pair of palm electrodes 24a and 24b are formed. Further, on the front surface of the housing 21, operation guidance, measurement status,
A display unit 25 on which measurement results, calculation results, and the like are displayed; operation keys 26 for inputting a control command of the measurement device 20 and personal parameters of the subject required for measurement; And a power key 27 for the user to operate.

FIG. 3 is a block diagram showing the internal configuration of the bioelectrical impedance measuring device shown in FIG. FIG.
As shown in the figure, the internal configuration of the measurement apparatus 20 includes a first block mainly for controlling, calculating and inputting and outputting data, and a second block mainly for measuring bioelectric impedance and converting an analog signal to a digital signal. And housed in the housing 21.

The first block is a control and arithmetic unit 31 for performing control related to measurement, processing of measured data, etc., a ROM 32 for storing control and arithmetic programs, constants and the like,
RAM 33 for temporarily storing measurement data, calculation results, externally read data, programs, and the like; nonvolatile auxiliary storage device 34 for storing, reading, and updating measurement data, calculation results, parameters related to measurement, and a display unit 25, a display device 35 for displaying operation guides, measurement conditions, measurement results, calculation results, and the like on the display unit 25, outputting measurement-related parameters, measurement results, and the like to an external device. An external input / output interface 36 for reading control information, a control program, and the like from the external device into the measurement apparatus 20, an external interface terminal 37 for connecting the external input / output interface to the external device, and an operation key 26, In response to the depression of the operation key 26, a control command of the measurement device 20
A key input device 38 for generating input information such as personal parameters of a subject required for measurement, a clock device 39 for acquiring time information for managing the date and time of measurement, a measured value,
A communication device 40 with a built-in modem for transmitting parameters and the like calculated from the measured values to another computer through a telephone line, connected to a power key 27, A power supply 41 for starting or stopping power supply to the power supply, and a power supply terminal 42 for supplying power to the power supply 41 from the outside.

The second block is a ROM 32 or a RAM
An AC signal generator 43 for generating an AC signal having a frequency determined by a control program stored in a control program 33;
Alternatively, an AC current output device 44 for converting an effective value to an AC signal determined by a control program stored in the RAM 33, a reference current detection device 45 for detecting a current flowing through a subject and outputting the detected current as a reference current detection signal A pair of AC current output terminals 46a and 46b for outputting an AC current supplied from the AC current output device 44 via the reference current detection device 45, and an analog signal output from the reference current detection device 45 as a digital signal. The first A / D converter 47 converts the potential signal into a pair of voltage measurement terminals 48a and 48b for inputting two potential signals of the person to be measured, and the difference between the potential signals between the pair of voltage measurement terminals 48a and 48b. A potential difference detecting device 49 that outputs a signal and a second A / D converter 50 that converts an analog signal output from the potential difference detecting device 49 into a digital signal are provided. A pair of AC current output terminals 46a, 46
b is connected to a pair of thumb electrodes 23a and 23b, and a pair of voltage measurement terminals 48a and 48b are connected to a pair of palm electrodes 24a and 24b.

FIG. 4 is a flowchart showing an outline of the measurement procedure and operation of the bioelectrical impedance measuring device shown in FIG. In step 1, the subject is powered on by the power key 2
When the user presses 7, the initialization of the inside of the measurement apparatus 20 is performed in step 2, and the initial screen shown in FIG. 5 is displayed on the display unit 25 in step 3. In step 4, it is determined whether or not the personal parameters of the subject, such as sex, height, weight, and age, have already been input. If the parameters have already been input, the process proceeds to step 8. If it has not been input yet, the process proceeds to step 5, and a personal parameter input screen is displayed on the display unit 25. In step 6, when the person to be measured depresses the operation key 26 and inputs personal parameters, the initial screen is displayed again on the display unit 25 in step 7.
Proceeding to step 8, when the subject presses the operation key 26 and inputs "1", a personal parameter input screen is displayed on the display unit 25 in step 9, and in step 10, there is a change in personal parameters. In step 11, the subject changes the personal parameter by pressing the operation key 26, and
Proceed to.

In step 11, the person to be measured operates the operation key 2
Press 6 to input an instruction to start measurement. Then, the left thumb is inserted into the left thumb insertion hole 22a, facing the front surface of the housing 21, and the inserted thumb is inserted into the left thumb electrode 23.
a, and the palm of the left hand is connected to the electrode 2 for the left palm.
4a. Similarly, the thumb of the right hand is inserted into the right thumb insertion hole 22b, the inserted thumb is placed in contact with the right thumb electrode 23b, and the palm of the right hand is inserted into the right palm electrode 24b.
Place in contact with When both hands are arranged on the main measurement apparatus 20 in this way, the palms of both hands are arranged at both ends of the main measurement apparatus 20 so as to face each other at a predetermined interval. In this state, the measurement device 20 is lifted by both hands, particularly the palms, so as to be sandwiched from the left and right ends, and the arm is stretched substantially horizontally to the front of the body in the standing position to perform the measurement. As described above, when measuring the bioelectrical impedance using the main measurement / measurement 20, the subject inserts both thumbs into the thumb insertion holes 22a and 22b and places both hands on the main measurement device 20, so that the thumb The insertion holes 22a and 22b function as positioning members that determine the direction and position of both hands,
Therefore, the person to be measured can always place his / her hands on the measuring device 20 in the same position and orientation of both hands.
Alternatively, the same measurement posture can be maintained during the measurement.
In addition, since the person to be measured places both hands, especially the palms, in contact with the palm electrodes 24a, 24b, the contact area between them becomes wider than in the conventional case where the fingers are placed in contact with the electrodes and measurement is performed. The contact resistance at this portion is smaller than in the conventional case where the finger is placed in contact with the electrode and measured. In addition, since the subject is lifted with both hands, especially the palms, no unnecessary force is applied to the joints and arms of the wrist as in the conventional case where the measurement is performed by holding the device with fingers. The measurement can be performed by lifting the measurement device 20. Further, the subject inserts the thumbs of both hands into the thumb insertion holes 22a and 22b and lifts the measuring device 20 in a state where the thumbs extend substantially horizontally. Even if the measurement device 20 comes off, the measurement device 20 is caught by the thumb and does not fall.

In step 12, the bioelectrical impedance is measured as follows. That is, the output signal frequency is set in the AC signal generator 43 based on the measurement control parameters stored in the ROM 32 in advance or from the auxiliary storage device 34 or the external input / output interface 36 in the RAM 33, and the AC signal generation is performed. The output signal from the device 43 is output to the AC current output device 44. An output current value is set in the constant current output circuit of the AC current output device 44 based on the measurement control parameter, and an output from the AC current output device 44 is supplied to a reference current detection device 45, a pair of AC current output terminals 46a and 46b. , A pair of thumb electrodes 23
The voltage is applied to the person to be measured via a and b in this order. At this time, the current flowing through the subject is detected by the reference current detection device 45, and the output of the analog signal is converted into a digital signal by the first A / D conversion device 47. The output of the digital signal is stored in the RAM 33. At the same time, two potential signals of the subject are output from a pair of palm electrodes 24a and 24b and a pair of voltage measurement terminals 48a and 48.
The signals are sequentially input to the potential difference detecting device 49 via the line b, and the potential difference detecting device 49 outputs a difference signal of the input potential signal to the second A / D converter 50. In the second A / D converter 50, the differential signal, which is an analog signal, is converted into a digital signal, and the output of the digital signal is stored in the RAM 33.
Is stored. In this way, the bioelectrical impedance is calculated based on the measurement control parameter at the frequency Fi (i =
1, 2,..., N) are repeatedly measured.

Subsequently, the process proceeds to step 13 and
The bioelectric impedance vector trajectory and parameters related thereto are calculated from the bioelectric impedance measured values measured in step (1).

Normally, the bioelectric impedance is represented by an equivalent circuit represented by a lumped constant composed of the extracellular fluid resistance Re, the intracellular fluid resistance Ri, and the cell membrane capacitance Cm as shown in FIG. Due to differences in their shapes and properties, the individual cells that make up a cell are represented by circuits with different constants. The impedance vector trajectory is not a semicircle but a circular arc according to the Cole-Cole arc rule.

Accordingly, in general, the bioelectric impedance draws a circular locus as shown in FIG.
Here, the X axis represents the resistance component of the bioelectric impedance, and the Y axis represents the reactance component of the bioelectric impedance. Since the reactance component of the bioelectrical impedance is capacitive and therefore takes a negative value, the bioelectrical impedance vector locus is located below the X axis, and the frequency F1 is assumed based on the assumption that the bioelectrical impedance vector locus is an arc. , F2,..., FN, bioelectric impedance measurement values Z1, Z
.., ZN are on the circumference of a circle. Here, assuming that the X coordinate of the center of the circle is a, the Y coordinate of the center of the circle is b, and the radius of the circle is r, the equation of the circle passing through the measured bioelectrical impedance is expressed as Equation 1.

(X−a) ² + (Y−b) ² = r ² (Equation 1) a, b, and r are expressed in Equation 1 by measuring the bioelectrical impedance Z1 at the frequencies F1, F2,. Z2, ...,
It is determined by substituting ZN.

From equation (1), X is expressed as follows.

From equation (2), the circle represented by equation (1) and X
The intersections R0 and Rinf with the axis (R0> Rinf) are obtained as follows.

Further, from Equations 3 and 4, Re and Ri in the equivalent circuit of FIG. 6 are obtained as follows.

Re = R0 (Equation 5) Ri = R0 · Rinf / (R0−Rinf) (Equation 6) In the bioelectric impedance vector Zc at the characteristic frequency Fc, the absolute value of the reactance component, that is, the Y-axis component is maximized. Since it is a point, the X coordinate value as a resistance component and the Y coordinate value as a reactance component in that case are calculated as follows.

X = a (Equation 7) Y = br (Equation 8) Here, when Rc is a resistance component of Zc and Xc is a reactance component of Zc, Zc is expressed as follows.

Zc = Rc + jXc = a + j (br) (Equation 9) When Z (ω) is a bioelectric impedance vector at ω, and τ and β are constants, an arbitrary angle is obtained from the Cole-Cole arc rule. The bioelectric impedance vector at the frequency ω is expressed as follows.

Further, assuming that τ = 1 / ωc, Equation 10 is expressed as follows.

Here, since ωc = 2πFc, using the previously measured bioelectrical impedance, F
c and β are determined.

Based on the bioelectric impedance vector trajectory obtained from the measured bioelectric impedance values and the parameters R0 and Rinf, Re and Ri, Zc, Rc, Xc, Fc, etc., the extracellular fluid volume, Body component amounts such as intracellular fluid volume, body water fluid volume (sum of extracellular fluid volume and intracellular fluid volume), body fat mass, lean mass (difference between body weight and body fat mass) are calculated, Also, from the calculated body component amount, the intracellular fluid amount to the extracellular fluid ratio, the extracellular fluid amount to the body water fluid ratio, the dehydration state determined from the body water fluid ratio,
The ratio of body fat and the like are calculated.

Then, the process proceeds to a step S14, wherein the measured value and the result calculated from the measured value are displayed on the display unit 25. In step 15, the measured values and the results calculated from the measured values are stored in the auxiliary storage device 34 or transmitted to an external device via the external input / output interface 36. Thereafter, the process proceeds to step 16, and when the subject presses the operation key 26 and inputs a re-measurement instruction, the measurement is performed again from step 11. If the subject does not input a re-measurement instruction in step 16 and presses the operation key 26 in step 17 to instruct a graph display, the measured value is calculated from the measured values obtained in the past and the measured values. The result is displayed as a graph on the display unit 25. Then, in step 18, when the subject presses the power key 27, a series of measurements ends, and the measurement device 20 stops.

If the subject presses the operation key 26 and inputs "2" in step 8 described above, in step 19 data and parameters related to display are read from the auxiliary storage device 34. Then, the process proceeds to step 17, where the predetermined data is displayed on the display unit 25 as a graph as described above. Then, in step 18, the main measurement device 20 stops as described above.

In step 8, if the subject presses the operation key 26 and inputs “3”, the process proceeds to step 20.
Then, data and parameters related to transmission are read from the auxiliary storage device 34, and in step 21, predetermined data is transmitted to another external data processing device via a telephone line. The predetermined data includes, for example, measurement values (bioelectric impedance, voltage, phase difference, measurement date and time, etc.) measured by the bioelectric impedance measurement described above, and parameters (R0, Rinf, Rinf) calculated from the measurement values.
e, Ri, Zc, Rc, Xc, Fc, etc.) Body component amounts (intracellular fluid volume, extracellular fluid volume, body water fluid volume, lean mass, fat mass, etc.), swelling index value (extracellular fluid volume) Volume, intracellular fluid volume to extracellular fluid volume ratio, extracellular fluid volume to body water fluid volume ratio, etc.), and personal parameters (identification number, name, gender, age, height, weight, etc.). Then, in step 18, the measuring device 20 is stopped as described above.

In steps 12 and 13 described above, measurement and calculation are performed on AC currents of a plurality of frequencies. However, measurement and calculation are performed more simply on AC current of a single frequency. Is also good.
In that case, in step 12, the bioelectrical impedance and the phase difference between the phase of the alternating current applied to the subject at the time of measuring the bioelectrical impedance and the phase of the voltage measured from the subject are simply calculated. It is measured only for one frequency F1.

In step 13, the resistance component value R1 and the reactance component value X1 are determined from the measured bioelectric impedance Z1 at the frequency of F1, and these values are shown in the example of FIG. 8 where F1 = 50 kHz. It is determined whether or not the resistance component and the reactance component are within the range of the normal values obtained in advance. If the value is not within the range of the normal value, a parameter related to the bioelectric impedance vector locus is calculated from the measured bioelectric impedance based on the following.

That is, the electrical characteristics of the bioelectrical impedance are the same as in the first embodiment. Assuming that the bioelectric impedance vector locus is an arc, the measured bioelectric impedance Z1 at the frequency F1 is on the circumference of a circle as shown in FIG. Here, the X axis represents the resistance component of the bioelectric impedance, and the Y axis represents the reactance component of the bioelectric impedance.

The bioelectric impedance vector at an arbitrary angular frequency ωF is expressed by the following equation (12), where ω0 and β are constants.
It is represented as

Further, assuming β = 1, Equation 12 is expressed as follows.

Based on the measured values of the bioelectrical impedance and the phase difference, and the resistance value obtained from the measured voltage and the applied AC current, the amount of body fluid, the amount of lean body mass, the amount of body fat, etc. The body component amount is calculated, and the ratio of body fat and the like are calculated from the calculated body component amount.

Although the embodiment of the bioelectrical impedance measuring apparatus according to the present invention has been described above, the present invention is not limited to this embodiment. For example, in the above-described embodiment, a pair of thumbs is used. The electrodes are a pair of measurement current application electrodes,
The pair of palm electrodes is a pair of voltage measurement electrodes, but the pair of thumb electrodes may be a pair of voltage measurement electrodes, and the pair of palm electrodes may be a pair of measurement current application electrodes.

In the above-described embodiment, the left and right thumb electrodes 23a and 23b are
Although it extends over the entire peripheral wall of a and 22b, it may also extend over only the lower part of the peripheral wall where the thumb is arranged.

In the above-described embodiment, the power is obtained from the outside of the measuring apparatus. However, the apparatus may be a battery type or a rechargeable type.

Further, in the above embodiment, the extracellular fluid volume,
Intracellular fluid volume, body fluid volume (sum of extracellular fluid volume and intracellular fluid volume), body fat mass, lean mass (difference between body weight and body fat mass),
Intracellular fluid volume to extracellular fluid volume ratio, extracellular fluid volume to body fluid volume ratio, dehydration state determined from body fluid volume ratio, body fat ratio, etc. are calculated, but pulse and blood pressure are calculated. May be.

[0047]

As described above, according to the bioelectrical impedance measuring apparatus of the present invention, since the thumb insertion hole which functions as a positioning member for determining the direction and the position of both hands is provided, it is always the same. Both hands can be placed on the measurement device in the position and orientation of the hands, and the same measurement posture can be maintained between or during measurements. In addition, since a pair of palm electrodes, in which both hands, especially the palms are in contact with each other, are provided, the contact area between the hands and the electrodes is relatively large, and the contact resistance in this portion is relatively small. Therefore, the bioelectrical impedance can be accurately measured.

Further, a pair of thumb electrodes on which the thumbs of both hands are arranged in contact and a pair of palm electrodes on which both hands, especially the palms are arranged, are provided. Since the lifting device can be lifted so as to be sandwiched from both ends, the measurement device can be lifted and measured without applying unnecessary force to the indirect part of the wrist, the arm, or the like. Therefore, the bioelectric impedance can be measured without a measurement error.

Further, a thumb insertion hole is provided so that the present measuring device can be lifted with the thumbs of both hands inserted into the thumb insertion holes so as to extend substantially horizontally. Even if the power of the palms of both hands is released, the present measuring device is caught by the thumb and does not fall.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a conventional bioelectrical impedance measuring device of a hand-only electrode type.

FIG. 2 is a perspective view showing an external configuration of one embodiment of the bioelectrical impedance measuring device according to the present invention.

FIG. 3 is a block diagram showing an internal configuration of the bioelectrical impedance measuring device shown in FIG.

FIG. 4 is a flowchart showing an outline of a measurement procedure and operation of the bioelectrical impedance measuring device shown in FIG. 2;

5 is a diagram showing an initial screen displayed on a display unit of the bioelectrical impedance measuring device shown in FIG.

FIG. 6 is an equivalent circuit diagram showing bioelectric impedance.

FIG. 7 is a graph showing a bioelectric impedance vector locus.

FIG. 8 is a graph showing a range of normal values of a resistance component and a reactance component of bioelectric impedance which are obtained in advance.

FIG. 9 is a graph showing a bioelectric impedance vector locus.

[Brief description of reference numerals]

 10, 20 Bioelectric impedance measuring device 11a, 11b Grip portion 12a, 12b Measurement current applying electrode 13a, 13b Voltage measuring electrode 21 Housing 22a Left thumb insertion hole 22b Right thumb insertion hole 23a Left thumb electrode 23b Right thumb electrode 24a Left Electrode for palm 24b Electrode for right palm 26 Operation key 27 Power key 31 Calculation and control device 32 ROM 33 RAM 34 Auxiliary storage device 35 Display device 36 External input / output interface 37 External interface terminal 38 Key input device 39 Clock device 40 Communication device 41 Power supply device 42 Power supply terminal 43 AC signal generation device 44 AC current output device 45 Reference current detection device 46a, 46b AC current output terminal 47 First A / D converter 48a, 48b Voltage measurement terminal 49 Potential difference detection device 5 0 Second A / D converter

Claims (7)

[Claims] 1. A bioelectrical impedance measuring apparatus of the type in which palms of both hands are arranged so as to face each other at a predetermined interval, and are lifted and used by both hands. A pair of thumb electrodes in which the thumbs of both hands inserted into the pair of thumb insertion holes are arranged in contact with each other; a pair of palm electrodes in which the palms of both hands are arranged in contact with each other; AC current supply means for supplying an AC current to the thumb electrode; voltage measurement means for measuring a voltage between the pair of palm electrodes; and a living body based on the supplied AC current and the measured voltage. A bioelectrical impedance measuring device, comprising: the calculating means for calculating an electrical impedance. 2. A bioelectrical impedance measuring apparatus of the type in which the palms of both hands are arranged so as to face each other at a predetermined interval, and are lifted and used with both hands. A pair of thumb electrodes in which the thumbs of both hands inserted into the pair of thumb insertion holes are arranged in contact with each other; a pair of palm electrodes in which the palms of both hands are arranged in contact with each other; AC current supply means for supplying an AC current to the palm electrode; voltage measurement means for measuring a voltage between the pair of thumb electrodes; based on the supplied AC current and the measured voltage A bioelectrical impedance measuring device comprising: 3. The device according to claim 1, wherein the shape and the size are such that the hands can be lifted by the palms of both hands.
A bioelectrical impedance measuring device according to item 1. 4. The arithmetic means comprises body fat, body water, pulse,
4. The bioelectrical impedance measuring device according to claim 1, wherein at least one of blood pressures is further calculated. 5. 5. The AC current supply means supplies AC currents of a plurality of different frequencies, the voltage measurement means measures a voltage corresponding to the AC current of each frequency, and the calculation means comprises:
The bioelectric impedance measuring apparatus according to any one of claims 1 to 4, wherein a bioelectric impedance is calculated based on the supplied alternating currents of different frequencies and the voltages measured corresponding thereto. . 6. The alternating current supply means supplies an alternating current having a single frequency, the voltage measuring means further measures a phase of the measured voltage, and the calculating means calculates a phase of the supplied current and The bioelectrical impedance measuring device according to any one of claims 1 to 4, further calculating a phase difference with the measured voltage. 7. The computing means may comprise a ratio of intracellular fluid volume to extracellular fluid volume ratio, extracellular fluid volume to body fluid volume ratio, intracellular fluid volume, extracellular fluid volume, body fluid volume, or body fat. The bioelectrical impedance measuring device according to claim 5 or 6, further calculating at least one of the quantities.