KR0123408B1 - Method and apparatus for determining body composition using bioelectrical impedance analysis - Google Patents

Abstract

The human body component analyzing system uses the dual node electrode method that connects the current terminal and the voltage terminal to the electrode plate at the same time. The system contacts each the right and the left foot on a couple of foot electrode plats(3,4) and a couple of hand electrode plates(1,2) and measures each human parts' impedance using the impedance measuring device(5) from the operation of automatic electrical switch(6) that controls by the microprocessor(18) and the weight using weight measurement censer(10) and through the keyboard(11), inputs height and age and using the microprocessor(18), measures the amount of body fluid and the component other than fat.

Description

Human component analysis device using bioelectrical impedance method and analysis method

1 is an electrical wiring diagram between the four electrode plate impedance measuring device in the present invention.

2 is an electrical wiring diagram between two electrode plates and an impedance measuring device in the present invention.

3 is a schematic perspective view of a human body component analysis device having four electrode plates using the bioelectrical impedance method of the present invention.

4 is a schematic perspective view of a human body component analysis device having two electrode plates using the bioelectrical impedance method of the present invention.

FIG. 5 is a circuit diagram of one embodiment of the apparatus for analyzing human components in FIG. 3 using the bioelectrical impedance method.

6 is a view schematically showing a conventional embodiment of measuring the bioelectrical impedance by attaching the electrode of the human body component analyzer to the back and the foot of the human body.

7 is a view schematically showing a model of the impedance of the left and right arms, left and right legs and the body of the human body.

8 (a)-(h) are diagrams schematically showing an electrical connection method for impedance measurement for each part of the human body in the present invention.

* Explanation of symbols for main parts of the drawings

1: left hand electrode plate 2: right hand electrode plate

3: left foot electrode plate 4: right foot electrode plate

5: impedance measuring device 6: electronic switch

7: two-handed electrode plate 8: both feet electrode plate

9: interface electronic circuit board 10: load measurement sensor

11: keyboard 12: display screen

13: ultrasonic height measurement sensor 14: printer

15,16: Amplifier and Filter 17: A / D Converter

18: microprocessor 19,20,21,22: surface adhesive electrode

[Field of Invention]

The present invention relates to an apparatus and method for analyzing human components through bioelectrical impedance analysis (BIA).

More specifically, the present invention relates to an apparatus and a method for measuring human body components such as body fluids, fats, muscles and the like by contacting a metal electrode plate with palms and soles by bioelectrical impedance analysis.

[Background of invention]

The human body is made up of water, protein, bone, and fat, except for a small amount of constituents, and their sum is weight. Quantitative measurement of these individual components is called the human component. The fat percentage of body weight is called obesity and is used as an indicator of the slimness of the body, and also used to diagnose various adult diseases. Medically, components other than fat, that is, the amount of muscle, are components that maintain the function of the body. Patients related to nutritional status, such as cancer patients and dialysis patients, can diagnose the rate of disease progression or the therapeutic effect by periodically measuring the amount of muscle in their bodies. Even when obese people exercise to lose weight, there is little change in body weight during a relatively short period of months. Even in this case, when measuring the body composition, the amount of fat in the human body is reduced, but the amount of muscle is increased, so the scientific effects of the exercise can be known more. In addition, the bioelectrical impedance method can diagnose the growth or development of the child or nutritional status of the elderly, especially in the case of various patients by measuring the distribution of water according to the parts of the human body is used as an important method for the diagnosis of patients. .

As a conventional method for measuring the components of the human body has been utilized in various ways. One of them is hydrodensitometry, which is a method of immersing the human body in water and weighing it, and then calculating the obesity from the specific gravity of the human body.Fat is higher than fat free mass (FFM). It uses the principle of light. Although this method is used as a standard method due to its high precision, it is inconvenient to use and also not applicable to patients or the elderly. Another conventional method for measuring the composition of the human body is a method of measuring the thickness of subcutaneous fat using a caliper or ultrasonic waves, which has an inaccurate drawback. Nuclear Magnetic Resonance (NMR), Dual Energy X-ray Absorptiomerty (DEXA), or photography by Total Body Electrial Conductivity (TOBEC), or dilution using D ₂ O or NaBr have been developed. However, the analytical methods by these methods have the disadvantage that they cannot be used simply and economically because of their high cost and difficulty in using them.

Another method for measuring the composition of the human body is the bioelectrical impedance analysis (BIA) method. This method has the advantage of being safer, cheaper and faster than other conventional methods. The conventional bioelectrical impedance method sends weak alternating current into the human body to measure the electrical resistance or electrical conductivity of the human body, and measures the height and weight to measure the amount of fluid from these measuring devices, the balance of moisture in and out of human cells, and FFM. It is a method of calculating. Subtracting the calculated FFM from body weight can measure the amount of fat in the human body, that is, the degree of obesity.

In the conventional bioelectrical impedance analysis method, the adhesive electrode is attached to a part of the human body, that is, the skin of the wrist, the back of the hand, the ankle and the foot, while the subject is lying, and the human body impedance between the wrist and the ankle is measured. The adhesive electrode attached to the necessary part of the human body is an electrode used when measuring an electrocardiogram or a similar thin plate electrode that is easily adhered to the same. According to this analysis method, the terminal from the impedance measuring device and the adhesive electrodes are connected to each other to send a pair of outer electrodes (back and instep) of 0.1 to 2.0 mA of alternating current having a frequency of about 1 KHz to 1 MHz. After measuring the voltage at the inner electrode (wrist and ankle), the impedance of the human body, that is, the resistance of the human body between the wrist and the ankle is measured. The AC current used here is commonly used having a frequency of about 50KHz and a magnitude of about 0.8mA.

The conventional analysis method is attached to the skin of the wrist, the back of the hand, the ankle and the foot of the four electrodes or similar type of electrode used for measuring the ECG to the skin of the wrist, hand, ankle and foot, and then electrically connected between the human body and the impedance measuring device It is a four-pole method that measures the resistance of the human body between the wrist and the ankle by sending a current between the instep. This method of analyzing human body components often involves operating a computer to attach an adhesive electrode to the correct part of the human body in the lying state of the subject, measure the impedance of each part of the human body, and obtain desired data such as obesity from the measured values. do. Therefore, the above analysis method can be used only under the condition of a trained measurer, and it is a difficult method for public use that can be used by the subject himself in a place such as a gymnasium or a sauna room. In addition, this method has an inaccurate drawback in that the measurement of the impedance of the arms, trunk and legs of the human body is integrated, resulting in measurement errors. In addition, in the conventional four-pole electrode method, since the measurer must manually attach the adhesive electrode to a necessary part of the subject's human body, the attachment position or the attachment state is not always the same, and as a result, a measurement error with respect to impedance occurs. Furthermore, when there is hair on the part of the human body of the subject to which the adhesive electrode is attached, it causes inconvenience of having to shave the hair with a razor. The analytical method is inconvenient to measure the impedance and calculate the obesity by operating the computer again. Moreover, the weight and height of the subject, which are necessary data for calculating the obesity degree, are inconvenient to use separate scales and height measuring devices. The above analysis method requires a lot of measurement time because the measurer must attach the adhesive electrode to the necessary part of the subject's body by hand, measure weight or height separately, and calculate obesity degree by computer again. There are also drawbacks.

[Purpose of invention]

An object of the present invention is to provide a human component analysis device using a bioelectric impedance that can be conveniently and easily analyzed human body components without a trained professional, such as measuring the weight with a scale.

Another object of the present invention is to replace the attachment and removal of the electrode on the skin surface in the conventional method by the operation of contacting the palm of the sole and the sole to the electrode plate of the subject to replace the electrode to the subject without the help of another person to measure the human body and impedance of the subject It is to provide a human body component analysis device that can make the electrical connection between the quick and easy.

Another object of the present invention by using a two-pole electrode method is to contact the metal electrode plate with the palm and sole of the sole of the sole to reduce the contact resistance between the human body and the electrode due to the large contact area to measure the human body impedance does not cause an error in the human body impedance measurement It is to provide an electrode device for.

Another object of the present invention is to reliably analyze the human body components without measuring errors due to the difference in the contact position between the electrode and the human body generated in the conventional four-pole electrode impedance measurement method by contacting the palm and soles with the metal electrode plate. It is for providing a device.

Still another object of the present invention is to provide a human body component analysis device capable of simultaneously measuring the body weight necessary for analyzing the human body components, and easily inputting the kidneys or simultaneously measuring the kidneys.

Still another object of the present invention is to provide a human body component analysis device capable of immediately knowing a human body component analysis result through a display screen and simultaneously printing the result.

Still another object of the present invention is to provide an apparatus capable of rapidly analyzing a human component, such as measuring a body weight with an electronic scale, compared with a large measurement time in the conventional impedance measuring method.

Another object of the present invention is to measure the impedance of each part of the human body, i.e., the left and right arms, the torso, and the left and right legs, respectively, using a convenient electrode method in a convenient manner, and to calculate the distribution of moisture in each region and the distribution of moisture in and out of cells. An object of the present invention is to provide an apparatus for analyzing human components.

Still another object of the present invention is to provide an analysis method capable of analyzing a human component for each part using the human component analysis device as described above.

[Summary of invention]

An apparatus for analyzing human body components using the bioelectrical impedance method of the present invention includes conductive electrode plates 1, 2, 3, and 4 for contacting left and right palms and left and right soles, respectively; A pair of current terminals (C ₁₎ and a voltage terminal (V ₁₎ is connected to the terminal (T ₁₎ and the terminal (T ₂₎ the other pair of current terminals (C ₂₎ and a voltage terminal (V ₂₎ is connected, and, about 1KHz to 1MHz frequency range of the 01.~2.0mA sending the alternating current adopted in the size between T ₁ and T ₂ terminals T ₁ and T ₂ to read the voltage difference between the voltage-to measure impedance from the current ratio An impedance measuring device 5; An electronic switch (6) for selecting an electrical connection between the conductive electrode plates (1, 2, 3, 4) and the terminals (T ₁ , T ₂ ) of the impedance measuring device (5); A load measuring sensor 10 for measuring a weight of the subject; A keyboard 11 for inputting height, age, gender, etc. of the subject; Amplifiers and filters (15, 16) and A / D converters (17) for interfacing the impedance measuring device (5) and the load measuring sensor (10) to a microprocessor (18); A microprocessor (18) for processing data obtained from the measuring device and the input device; And a display screen 12 for displaying the processed data.

The apparatus for analyzing human body components of the present invention further includes a printer 14 in which data processed by the microprocessor 18 is displayed on the display screen 12 and can be printed if necessary.

The human body impedance measuring method of the present invention uses a two-pole electrode method for simultaneously connecting a current terminal and a voltage terminal to an electrode plate, and on the pair of hand electrode plates 1 and 2 and the pair of foot electrode plates 3 and 4, respectively. Contacting the left and right palms with the left and right soles; Measuring respective impedances between the human body parts by the impedance measuring device 5 from the operation of the automatic electronic switch 6 controlled by the microprocessor 18; The weight is measured by the load measuring sensor 10; Inputting height, age, gender, etc. through the keyboard 11; And it is a method for measuring the human component by measuring the amount of body fluid (TBW), non-fat components (FFM), obesity (% BF) by the microprocessor (18). Of course, the data obtained by the analysis can be displayed on the display screen 12 and / or printed by the printer 14.

Detailed Description of the Invention

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an electrical wiring diagram between four electrode plates and an impedance measuring device in the present invention.

3 is a schematic perspective view of a human body component analyzer having four electrode plates using the bioelectrical impedance method of the present invention, and FIG. 5 is a circuit diagram of the human body component analyzer of FIG.

An apparatus for analyzing human body components using the bioelectrical impedance method of the present invention includes conductive electrode plates 1, 2, 3, and 4 for contacting left and right palms and left and right soles, respectively; A pair of current terminals (C ₁₎ and a voltage terminal (V ₁₎ is connected to the terminal (T ₁₎ and the terminal (T ₂₎ the other pair of current terminals (C ₂₎ and a voltage terminal (V ₂₎ is connected, and, about 1KHz to 1MHz frequency range of the 01.~2.0mA sending the alternating current adopted in the size between T ₁ and T ₂ terminals T ₁ and T ₂ to read the voltage difference between the voltage-to measure impedance from the current ratio An impedance measuring device 5; An electronic switch (6) for selecting an electrical connection between the conductive electrode plates (1, 2, 3, 4) and the terminals (T ₁ , T ₂ ) of the impedance measuring device (5); A load measuring sensor 10 for measuring a weight of the subject; A keyboard 11 for inputting height, age, gender, etc. of the subject; An impedance and A / D converter 17 for connecting the impedance measuring device 5 and the load measuring sensor 10 to the microprocessor 18; A microprocessor (18) for processing data obtained from the measuring device and the input device; And a display screen 12 for displaying the processed data.

The apparatus for analyzing human body components of the present invention further includes a printer 14 in which data processed by the microprocessor 18 is displayed on the display screen 12 and can be printed if necessary.

The conventional method for measuring the bioelectrical impedance is to attach the four adhesive low (19, 20, 21, 22) to the skin of the wrist, back of the hand, ankle and the foot to electrically connect between the human body and the impedance measuring device, As shown in Fig. 6, it is a 4-pole electrode method that sends an electric current between the back of the hand and the foot and measures the body resistance between the wrist and the ankle. That is, the 4-pole electrode method is a method of measuring the resistance by sending a current to the outer pair of electrodes using four electrodes and measuring the voltage from the inner pair of electrodes.

In the conventional impedance method, the impedance is measured by attaching an adhesive electrode to the skin on the wrist, the back of the hand, the ankle, and the foot in the state where the subject is lying as shown in FIG. When the terminals from the impedance measuring device are connected to these electrodes 19, 20, 21 and 22, the measuring device generates a sinusoidal alternating current of 01. to 2.0 mA with a frequency of about 1 KHz to 1 MHz. ₁ , and C ₂ (a pair of outer electrodes) and the voltage difference between V ₁ and V ₂ (a pair of inner electrodes) to measure the body's resistance. The resistance R is related to the length L of the conductor, the cross-sectional area A, and the specific resistance ρ of the conductor, and is represented by the following formula (E1).

R = ρL / A (E1)

Multiplying L by the numerator and denominator of the right side of formula (E1) yields the following formula (E2).

R = ρL ² / (AL) (E2)

Assuming that the human body is a simple cylinder having a length L and a cross-sectional area A, AL becomes the volume V of the conductor.

V = ρL ² / R (E3)

The human body forms a conductor by a total body water (TBW) or an FFM containing a lot of body fluid. The length of the conductor can be estimated by the human body height (Ht), and the specific resistance (ρ) can be expressed in the human body by the formula (E4).

TBW or FFM = C ₁ Ht ² / R + C ₂ (E4)

In the above equation, the proportional upper portion C ₁ and the upper portion C ₂ are determined from TBW or FFM values obtained by dilution method or body density method and L ² / R. TBW and FFM are obtained by substituting the human body resistance (R) and the height (Ht) in the equation (E4) thus determined. When FFM is subtracted from the weight (Wt), the fat mass is obtained. Percent body fat (% BF) is expressed as the formula (E5) as the fat mass relative to the weight (Wt).

Obesity degree (% BF) = 100 (Wt-FFM) / Wt (E5)

The human body component analyzing apparatus of the present invention uses a two-pole electrode method for simultaneously connecting a current terminal and a voltage terminal to an electrode plate. That is, one or two electrode plates of four electrode plates are connected to a terminal T ₁ in which the current terminal and the voltage terminal from the impedance measuring device 5 in the two-pole electrode method of the present invention are electrically connected at the same time. the current terminals and the voltage terminals are electrically connected to one or two electrodes of plate are not simultaneously connected to the terminal T ₂ is connected to the terminal T ₂ to the electrode plate. When the human body contacts between the two electrodes, the impedance between parts of the human body in contact with the electrode is measured. The bipolar electrode method is easy to measure by reducing the number of four electrodes required by the four electrode method to two, but there is a drawback in generating an error in the resistance measurement of the human body due to the effect of contact resistance between the human body and the electrode. Therefore, in the present invention, the entire surface of the palm and the sole of the sole contact the metal electrode plate, thereby greatly reducing the contact resistance due to the large contact area so as not to significantly affect the impedance or resistance measurement of the human body. In addition, before contacting the metal electrode plate, a cream solution having high electrical conductivity was applied to the palms and the soles of the feet to further reduce the contact resistance, thereby making it possible to measure the reliable human impedance by the bipolar electrode method.

In the present invention, the impedance measurement method uses four metal plates as electrodes to stand on the foot electrode plates 3 and 4 with bare feet and to hold the two palms on the hand electrode plates 1 and 2 to closely contact the human body through the palms and the soles of the feet. The impedance of each part of the human body by measuring the electrical connection between the and the impedance measuring device. The purpose of using four electrodes is to contact the four electrodes with the left and right palms and the soles, respectively, as well as the impedance between the left and right palms, as well as the inter-impedance between the left and right palms, and between the left and right soles. To measure the human body impedance of the back between the various parts and to measure the human body impedance in the left and right arms, legs and torso respectively.

The method using two electrodes is a method of measuring the human body impedance between both palms and the soles by contacting both palms to one electrode and both soles to the other electrode. An electrical wiring diagram of an impedance, measuring device consisting of two electrode plates is shown in FIG. 2, and one embodiment of an anatomical component analyzer having two electrode plates 6,7 is shown in FIG. Another embodiment of the present invention shown in FIG. 4 is an integrally formed hand electrode plate 7 for contacting left and right palms, an integrally formed foot electrode plate 8 for contacting left and right soles, left and right palms and left and right soles. Measuring device 5 for measuring the impedance between the load sensor 10 for measuring the weight of the subject, ultrasonic height measuring sensor 13 for measuring the height of the subject, and obtained from the measuring apparatus And a microprocessor and interface electronic circuit board 9 for processing data, and a printer 14 capable of printing the processed data. Of course, also in the embodiment shown in Figure 4 may include a keyboard for inputting the height, age, gender, etc. of the subject, and a display screen for displaying the processed data.

In the present invention, when the four electrodes are used, the resistance in the whole body, the left arm, the right arm, the left leg, the right leg, and the torso can be measured separately. Impedance for each body part is measured as follows. 7 is a diagram showing a model of the left and right arms, the left and right legs, and the bodily impedance of the human body. As shown in FIG. 7, resistances of the left arm, the right arm, the upper body, the left leg, and the right leg constituting the human body are interpreted as resistors of R ₁ , R ₂ , R ₃ , R _4, and R ₅ , respectively.

The resistance Rw of the whole body is measured between both palms and the soles of the feet as shown in FIG. 8 (a), and the resistance Rw is expressed as shown in equation (E6).

Rw = (R ₁ · R ₂ ) / (R ₁ + R ₂ ) + R ₃ + (R ₄ · R ₅ ) / (R ₄ + R ₅ ) (E6)

The sum (Ra) of the resistance (R1) of the left arm and the resistance (R2) of the right arm is measured as shown in FIG.

Ra = R1 + R2 (E7)

The resistance Rw-2 between the two legs and the left arm is measured as shown in FIG. 8 (f), and the resistance Rw-1 of both legs and the right arm is measured as shown in FIG. 8 (e). These are represented by the following formulas (E8) and (E9).

Rw-2 = R1 + R3 + (R4R5) / (R4 + R5) (E8)

Rw-1 = R1 + R3 + (R4R5) / (R4 + R5) (E9)

The following formula (E10) is obtained by subtracting the above formula (E9) from the above formula (E8).

Rw-2-Rw-1 = R1-R2 (E10)

R1 and R2 of following formula (E11 and E12) are respectively calculated | required from said Formula (E7) and said Formula (E10).

R1 = (Ra + Rw-2-Rw-1) / 2 (E11)

R2 = (Ra + Rw-2-Rw-1) / 2 (E12)

By adding the left leg resistance R4 and the right leg resistance R5, the resistance R1 at both legs is obtained as in Equation (E13).

R1 = R4 + R5 (E13)

The resistance Rw-5 between both arms and the left leg is measured as shown in FIG. 8 (h), and the resistance Rw-4 between both arms and the right leg is measured as shown in FIG. 8 (g). These are represented by the following formulas (E14) and (E15).

Rw-5 = (R1R2) / (R1 + R2) + R3 + R4 (E14)

Rw-4 = (R1 · R2) / (R1 + R2) + R3 + R5 (E15)

The following formula (E16) is obtained by subtracting the formula (E15) from the formula (E14).

Rw-5-Rw-4 = R4-R5 (E16)

R4 and R5 of the following formulas (E17 and E18) are obtained from the formula (E13) and the formula (E16).

R4 = (R1 + Rw-5-Rw-4) / 2 (E17)

R5 = (R1 + Rw-5-Rw-4) / 2 (E18)

The trunk resistance Rt is obtained by subtracting the parallel connection resistance values of the left and right arms and the parallel connection resistance of the left and right legs from Rw of the above formula (E6).

Rt = (Rw- (R1R2) / (R1 + R2)-(R4R5) / (R4 + R5) (E19)

In the present invention, a component of the human body, that is, water (TBW) or a component other than fat (FFM) is a ratio of the resistance value for each part of the body and the Ht2 / Rw value, which is a function of the resistance value (Rw) of the whole body, for example, Using the independent variable multiplied by Ht2 / Rw by the ratio (Ra / Rt) of the resistance value of the body, it is calculated as in the following equation (E20).

TBW or FFM = C1Ht2 / Rw + C2 · (Ra / Rt) Ht2 / Rw + C3 (E20)

In the above formula, C1, C2 and C3 are proportional constants or constants obtained by proportionality between impedance independent variables using TBW or FFM obtained by the body density method or heavy water dilution method in the above formula (E20). In the above formula, Ra may be replaced with R1 or Ra + R1.

The components of the human body parts are functions of the height and the resistance values of the parts of the body. For example, the FFM of the left arm is represented by the following equation (E21).

FFMleft arm = C1Ht2 / Rw + C2 (E21)

The total body fat (Fat) is obtained by subtracting FFM from body weight (Wt) as shown in Equation (E22).

Fat = Wt-FFM (E22)

Obesity degree (% BF) of the human body is obtained by multiplying the ratio of fat mass to body weight (Wt) by 100 as shown in the following formula (E23).

% BF = 100 (Wt-FFM) / Wt (E23)

The current used when measuring human impedance or resistance for the purpose of measuring the amount of body fluid and components other than fat is 0.1-2.0 mA of alternating current having a frequency of 1 KHz to 1 MHz. At this time, the alternating current used preferably has a magnitude of about 0.8 mA of about 50 KHz.

When used to measure the ratio of intracellular water (ICW) and extracellular fluid (Extracelluar Water (ECW)), the impedance or resistance of the human body is measured at low and high frequencies, respectively, in the frequency range of 1 KHz to 1 MHz. . Low frequency means less than 10KHz, high frequency means more than 50KHz. The distribution of body fluid is calculated as a linear or nonlinear function using the ratio of resistance at high frequency and low frequency (R high frequency / R low frequency) as an independent variable. For example, the ratio of water in the cells in the body fluid is represented by the following formula (E24).

ECW / TBW = C ₁ · (R High _Frequency / R _{Low Frequency} ) + C ₂

The body fluid distribution measurement method as described above can be applied to both the metal plate electrode method of the present invention and the bioelectrode method for analyzing human components using the conventional surface bonding electrode method.

The human body component analyzing apparatus according to the conventional method uses a four-pole electrode method for connecting contact electrodes to current terminals or voltage terminals, respectively. However, the apparatus of the present invention connects a current terminal and a voltage terminal to the same electrode plate at the same time. The bipolar electrode method is used.

In the present invention, the human body component analyzer is placed on a pair of power pole plates (3,4) as if the body weight is measured on a scale, and the two palms are contacted on the pair of hand electrode plates (1,2). The subject puts his feet on the foot electrode plates (3, 4) while wearing light clothes, such as measuring weight. In case of using four electrodes as shown in FIGS. 1 and 3, the subject takes off his socks and wears light clothes, and then goes up to the human body analysis apparatus of the present invention using the keyboard 11 to measure the height, age, After inputting the sex, the palm and the sole are brought into contact with the designated left hand electrode plate 1, right hand electrode plate 2, left foot electrode plate 3, and right foot electrode plate 4, respectively. The T ₁ terminal, in which the current terminal C ₁ and the voltage terminal V _{1 of the} impedance measuring device 5 are electrically connected, is connected to one or two electrode plates of four electrode plates, and the current terminal C ₂ ) The T ₂ terminal, which is electrically connected to the voltage terminal V ₂ , is connected to one or two electrode plates of the electrode plate not connected to the T ₁ terminal. The impedance measuring apparatus 5 measures the resistance between parts of the human body in contact with the electrode plates connected to T ₁ and T ₂ . At this time, the connection method is exchanged by the electronic automatic switch 6 controlled by the connected microprocessor 18 between the terminals T ₁ and T ₂ and the four electrode plates 1, 2, 3 and 4. Measure

2 and 4, when two electrodes are used, when the two palms contact the hand electrode plate 6 and both feet step on the foot electrode plate 7, the terminal T ₁ of the impedance measuring device is the hand electrode. T ₂ on the plate is connected to the foot electrode plate to measure the overall impedance of the human body between both palms and the soles of the feet. If two electrodes 6 and 7 are used, an electronic automatic switch is not used to exchange the connection between the electrode plate and the impedance machine.

The resistance of each part of the human body measured by controlling the electronic automatic switch by the microprocessor 18 is shown in FIGS. 8A to 8H. In FIG. 8, (a) is a diagram showing the electrical connection between both hands and both feet, i.e., when measuring the resistance of the entire body, (b) is the resistance of the right hand and the right launcher, (c) is the left side (D) the resistance between the left hand and the right hand, (e) the resistance between the right and left launchers, (f) the resistance between the left and right launchers, (g ) Shows the resistance between the right foot and the left and right hands, and (h) shows the electrical connection when measuring the resistance between the left foot and the left and right hands. The measured impedance value is stored in the microprocessor 18 in order, and the impedance of the switch is measured in turn by changing the connection of the switch.

Body weight is measured by the load measuring sensor 10 built in the lower part of the foot electrode plate of the human body component analyzer. The measured body weight is stored in the microprocessor 18 via the AMP and filters 15 and 16 and the A / D converter 17.

The height is input via the keyboard 11 and stored in the microprocessor 18 via the interface. In addition to the height, the age or gender of the subject may be input. Necessary human components such as the amount of body fluid (TBW), non-fat components (FFM), obesity (% BF), and ratio of ICW and ECW by the microprocessor 18 from the stored impedance, weight and height of each part of the human body. The analyzed data may be displayed on the display screen 12 and / or printed by the printer 14.

The human body component analyzing apparatus of the present invention can analyze the human body components conveniently and easily by itself without a well-trained professional, such as measuring the weight with a scale, and by contacting the metal electrode plate with palms and soles It allows the measurer to always maintain the contact area between the human body and the electrode plate without requiring special attention, and because of the large contact area, the contact resistance is reduced and the contact resistance is not generated. It has the effect of invention as understood.

Simple modifications and variations of the present invention will be apparent to those skilled in the art to which this invention pertains, and such changes or modifications should be limited by the appended claims.

Claims (13)

Conductive electrode plates 1, 2, 3, and 4 for contacting the left and right palms and the left and right soles, respectively; A pair of current terminals (C ₁₎ and a voltage terminal (V ₁₎ is connected to the terminal (T ₁₎ and the terminal (T ₂₎ the other pair of current terminals (C ₂₎ and a voltage terminal (V ₂₎ is connected, and, about 1KHz to 1MHz frequency range of the 01.~2.0mA sending the alternating current adopted in the size between T ₁ and T ₂ terminals T ₁ and T ₂ to read the voltage difference between the voltage-to measure impedance from the current ratio An impedance measuring device 5; An electronic switch (6) for selecting an electrical connection between the conductive electrode plates (1, 2, 3, 4) and the terminals (T ₁ , T ₂ ) of the impedance measuring device (5); A load measuring sensor 10 for measuring a weight of the subject; A keyboard 11 for inputting height, age, gender, etc. of the subject; Amplifiers and filters (15, 16) and A / D converters (17) for interfacing the impedance measuring device (5) and the load measuring sensor (10) to a microprocessor (18); A microprocessor (18) for processing data obtained from the measuring device and the input device; And a display screen (12) for displaying the processed data, and measuring a bioelectrical impedance using a two-pole electrode method for connecting a current terminal and a voltage terminal to the same electrode plate. The apparatus of claim 1, further comprising a printer (6) to which data processed by the microprocessor (18) is printed. The apparatus of claim 1, wherein the analysis device further comprises an ultrasonic elongation sensor (13) for measuring the height of the subject. A hand electrode plate 7 integrally formed to contact the left and right palms by being connected to a terminal T ₁ to which the current terminal C ₁ and the voltage terminal V ₁ connected from the impedance measuring device 5 are connected; An impedance measuring device (5) connected to a terminal T ₂ to which a current terminal (C ₂ ) and a voltage terminal (V ₂ ) from the impedance measuring device (5) are connected to measure impedance between right and left soles; A load measuring sensor 10 for measuring the weight of the subject, and an ultrasonic height measuring sensor 13 for measuring the height of the subject; A microprocessor and interface electronic circuit board (9) for processing data obtained from said measuring device; And a printer (14) for printing the processed data and measuring the bioelectrical impedance using a two-pole electrode method for simultaneously connecting a current terminal and a voltage terminal to an electrode plate. The apparatus of claim 4, wherein the analysis device further comprises a keyboard (11) for inputting the height, age, gender, etc. of the subject. 5. The human body analysis device according to claim 4, wherein the analysis device further comprises a display screen (12) for displaying the processed data. In the method for measuring the bioelectrical impedance, four left and right hand bark and left and right foot contact with the terminal T ₁ to which a pair of current terminals C ₁ and voltage terminals V ₁ from the impedance measuring device 5 are connected. One or two electrode plates of the electrode plates 1, 2, 3, and 4 are connected by an electronic switch 6, and a pair of current terminals C ₂ and voltage from the impedance measuring device 5 are connected. Of the four electrodes 1, 2, 3, and 4 in which the left and right hand bars and the left and right soles contact the terminal T ₂ to which the terminal V ₂ is connected, any one or two of the electrode plates which are not connected to T1 are electronic switches. It is connected by 6, and how to contact the palm of the hand and soles of the feet to the electrode plate (1, 2, 3, 4) determined by the biological impedance of an electrode pansiyi the T ₁ and T ₂ connected to the second pole electrode method In the method for measuring the bioelectrical impedance, the integrated hand electrode plate 7 in which the left and right palms are in contact with T ₁ connected to a pair of current terminals C ₁ and voltage terminals V ₁ from the impedance measuring device 5. And a power generating plate 8 in which left and right soles are in contact with a terminal T2 connected to and connected to another pair of current terminals C ₂ and voltage terminals V ₂ from the impedance measuring device 5. Method for measuring the bioelectrical impedance by a two-pole electrode method characterized in that connected to. Contacting the left and right hand sole soles at the electrode plates 1, 2, 3, 4 connected to the terminals T ₁ and T ₂ via the electronic switch 6; Measuring respective impedances between the human body parts by the impedance measuring device 5 from the operation of the electronic switch 6 controlled by the microprocessor 18; The weight is measured by the load measuring sensor 10; Input height, age, and gender via the keyboard 11; Analyzing the amount of body fluid (TBW), non-fat components (FFM), and obesity (% BF) by the microprocessor 18; And (4) displaying the analyzed data. 10. The method of claim 9, wherein the step of measuring each impedance between the body parts is a terminal T | to which a pair of current terminals C ₁ and voltage terminals V ₁ connected from the impedance measuring apparatus 5 are connected. _1, any one or two electrodes of the four electrode plates (1, 2, 3, 4) to the left and right hand and left foot in contact with the plate are connected by an electronic switch (6), emerging from the impedance measuring device (5) It is not connected to T ₁ of the four electrode plates (1, 2, 3, 4) in which the left and right palms and the left and right soles contact the terminal T ₂ to which the other pair of current terminals C ₂ and the voltage terminal V ₂ are connected. One or two of the electrode plates are connected by an electronic switch 6, and the palms and the soles of the electrode plates 1, 2, 3 and 4 are in contact with _{each other} and the electrode plates between T ₁ and T ₂ are connected. A human body component analyzer, characterized in that the bioimpedance is measured by a bipolar electrode method. The method of claim 9 or 10, further comprising the step of printing the analyzed data by a printer (14). The left and right soles are brought into contact with the left and right palms and the power generation electrode plate 8 connected to the terminal T ₂ and formed integrally with the hand electrode plate 7 connected to the terminal T ₁ and integrally formed with the impedance measuring device 5; Measuring the impedance between the left and right palms and the sole by the impedance measuring device 5; The weight is measured by the load measuring sensor 10; The height is measured by the ultrasonic elongation measuring sensor 13; Analyzing the amount of body fluid (TBW), non-fat components (FFM), and obesity (% BF) by means of a microprocessor and an interface electronic plate (9); And printing the analyzed data by a printer (14). The method of claim 12, wherein the step of measuring the impedance between the left and right palms and the left and right soles is performed at the terminal T ₁ to which the pair of current terminals C ₁ and the voltage terminal V ₁ connected from the impedance measuring device 5 are connected. The left and right palms are connected to an integrated hand electrode plate 7 which is in contact with each other, and the left and right terminals T ₂ connected to another pair of current terminals C ₂ and voltage terminals V ₂ from the impedance measuring device 5. Human body component analysis method characterized in that the bioelectric impedance is measured by a two-pole electrode method is connected to the integrated power pole plate (8) that the sole is in contact.