Bioelectrical impedance analyzer

专利摘要:
PURPOSE: A bio-electricity impedance measuring apparatus is provided to improve the accuracy of impedance measurement by installing electronic switches on each of electrodes contacting to human body. CONSTITUTION: Electrodes(E1-E8) are provided for contacting to right-palm, right-thumb, left-palm, left-thumb, right-front-foot, right-back-foot, left-front-foot, and left-back-foot. An impedance measuring unit(11) measures an impedance of the human body. A first electronic switch(10) selects electrical connections between the electrodes(E1-E8) and the impedance measuring unit(11) under the control of a microprocessor(14). A weight measuring sensor(18) measures the weight of a patient. A keyboard(15) is used to input the height, sex, and age of the patient. Amplifiers(12,19) and an analog-digital converter(13) are installed to interface the microprocessor(14) with the impedance measuring unit(11) and the weight measuring sensor(18).
公开号:KR20020091488A
申请号:KR1020010030205
申请日:2001-05-30
公开日:2002-12-06
发明作者:문병삼；김우진
申请人:주식회사 바이오스페이스；
IPC主号:

专利说明:

Bioelectric Impedance Measurement Device {BIOELECTRICAL IMPEDANCE ANALYZER}
[13] The present invention relates to a bioelectrical impedance measuring apparatus, and more particularly, in an apparatus for measuring impedance of a human body, an electronic switch is installed in each electrode in contact with the human body to provide a current path flowing from the electrode to the bioelectrical impedance measuring apparatus. The present invention relates to a bioelectric impedance measuring apparatus capable of reducing measurement errors due to leakage current leaking through a cable of a bioelectrical impedance measuring apparatus by blocking in advance.
[14] Recently, due to the rapid industrialization and improvement of living standards, he has been interested in obesity and adult diseases, so he always tries to use it as a basic examination data by grasping the changes of his / her human body components.
[15] Body composition analysis refers to quantitative measurement of individual components such as water, protein, bone, and fat that make up the human body, and a device for measuring the body composition is also called a body composition analyzer.
[16] Body fat is not only a major indicator of obesity, but also a cause of adult disease. In addition, the amount of water is closely related to the amount of muscle, the muscle mass is an important component of the body and the main component of the energy, the muscle mass in the body is an indicator of the nutritional status of the individual has a wide range of medical applications.
[17] Therefore, there is a growing need to simply monitor the changes in body composition before going to a specialized clinic such as a hospital and undergoing a professional diagnosis in daily life to balance the diet or the human body.
[18] As a method of analyzing body composition as described above, a method using bioelectrical impedance analysis which is inexpensive and harmless to the human body is widely used.
[19] The bioelectrical impedance method is a safe, inexpensive, and quick method for measuring the electrical resistance or electrical conductivity of a human body. A pair of current electrodes and a pair of voltage electrodes are in contact with the human body, and then a pair of current electrodes are used to measure about 1 KHz to 1 MHz. It is a method of calculating the impedance of the human body after sending an AC current of 0.1 to 2.0mA with a frequency and measuring the voltage at a pair of voltage electrodes.
[20] The bioelectrical impedance method is widely used in body fat analysis because the body resistance can be analyzed precisely when measuring the body resistance because the body resistance is different depending on the quantification of body composition such as water, protein, bone and fat constituting the human body. That is, the amount of body fluid, muscle mass, body fat, etc. are calculated using a value of measuring the electrical resistance or electrical impedance of the human body by sending a weak current into the human body and using information such as the height, weight, age, and gender of the user.
[21] The inventor of the present application has a patent application for the human component analysis device using the bioelectrical impedance method and its analysis method and obtained a patent with the Republic of Korea Patent 123408 (1997.9.12) and the Republic of Korea Patent 161602 (August 25, 1998).
[22] 1 is a circuit diagram of an apparatus for analyzing human body components using a bioelectrical impedance method according to the related art.
[23] The circuit diagram shown here is a circuit diagram as disclosed in Patent No. 123408.
[24] As shown here, in the body composition analyzer using the bioelectrical impedance method, a load measuring sensor 18 is installed to measure the weight of a subject, such as a conventional scale, and the measured weight is input to the microprocessor 14, and the height is increased. The age, gender, etc. are input through the keyboard 15, and the microprocessor 14 calculates the human body components such as the amount of body fluid (TBW), components other than fat (FFM), and body fat percentage (% BF).
[25] That is, electrodes E1 to E8 are provided for contacting the right palm, right thumb, left palm, left thumb, right forefoot, right forefoot, left forefoot and left forefoot respectively. Then, an impedance measuring device 11 for measuring an impedance by a voltage-to-current ratio by flowing an alternating current between two electrodes of the electrode and reading a voltage difference between the other two electrodes, and electrodes E1 to E8 and an impedance measuring device. An electronic switch 10 controlled by the microprocessor 11 to select the electrical connection of 11, a load measuring sensor 18 for measuring the weight of the subject, height, age and sex of the subject A keyboard 15 for inputting a back, amplifiers 12 and 19, an A / D converter 13, and a measuring instrument for interfacing the impedance measuring instrument 11 and the load measuring sensor 18 to the microprocessor 14; (11) and the display screen 16 for displaying the data processed by the microprocessor 14 and the microprocessor 14 for processing data obtained from the keyboard 15 and controlling the electronic switch 10, and Microprocessor It consists of a printer 17 which can print the data processed by (14).
[26] In the above, the impedance measuring instrument 11 is connected to eight electrodes E1 to E8, and the eight electrodes E1 to E8 serve as current and voltage electrodes. The switches 10 are connected by the microprocessor 14 so that the electrodes E1 and E2 have different electrodes. For example, when electrode E1 is connected to a current electrode, electrode E2 is connected to a voltage electrode, and when electrode E2 is connected to a current electrode, electrode E1 is connected to a voltage electrode. The electrodes E3 and E4 are likewise connected to have different electrodes, and the electrodes E5 and E6 are also the same. The electrodes E7 and E8 are also the same as above.
[27] That is, each of the electrodes E1 to E8 serves as a current electrode or a voltage electrode. Thus, as shown in Fig. 1, when terminals E1, E3, E5 and E7 are used as current electrodes, terminals E2, E4, E6 and E8 are used as voltage electrodes, and terminals E2, E4, E6 and E8 are current electrodes. When used as, terminals E1, E3, E5 and E7 are used as voltage electrodes.
[28] In order to measure impedance for each part of the human body, the electrical connection between the electrodes E1 to E8 and the impedance measuring instrument 11 has to be exchanged several times in a predetermined order. The controlled electronic switch 10 is used.
[29] Thus, as shown in FIG. 2, the current is applied to the electrodes E2 and E4 by adjusting the electronic switch, and the resistance R1 is measured by measuring the voltage between the electrodes E1 and E5.
[30] However, in this way, the electronic switch 10 located inside the body of the body composition analyzer is switched to apply current to the electrodes E2 and E4 and the electronic switch is switched to measure the voltage between the electrodes E1 and E5 to measure the applied current and voltage. The impedance is measured.
[31] At this time, the basic prerequisite is that the current is applied from the impedance measuring instrument 11 to the electrode E2 which is the hand electrode of the measurer by switching the electronic switch 10 so that the right thumb (Rb)-the right arm (R1)-the left arm (R2)- The precondition is that the left hand thumb Rb flows to the impedance measuring instrument 11 via the electrode E4 and the electronic switch.
[32] However, despite the fact that it must flow only through electrodes E1 and E5 along each part of the human body, it is input into the body composition analyzer along the cable through other electrodes (E2, E3, E4, E6, E7, E8) in contact with the human body. There is a problem that accurate impedance measurement is not made by the leakage current leaks as the current flows along the cable.
[33] The present invention was created to solve the above problems, an object of the present invention is to install an electronic switch in each electrode in contact with the human body in the apparatus for measuring the impedance of the human body from the electrode to the bioelectrical impedance measuring apparatus The present invention provides a bioelectrical impedance measuring apparatus for reducing a measurement error due to leakage current leaking through a cable of a bioelectrical impedance measuring apparatus by blocking a flowing current path in advance.
[1] 1 is a circuit diagram of an apparatus for analyzing human body components using a bioelectrical impedance method according to the related art.
[2] 2 is a circuit diagram schematically showing an electrical circuit for impedance measurement for each body part by the prior art.
[3] 3 is a circuit diagram of a bioelectrical impedance measuring apparatus according to the present invention.
[4] 4 is a circuit diagram schematically showing an electrical circuit for impedance measurement for each human body by the bioelectrical impedance measuring apparatus according to the present invention.
[5] 5 is a table showing the results of measuring the impedance model for each measurement site by the prior art and the technique of the present invention.
[6] -Explanation of symbols for the main parts of the drawings-
[7] 10 electronic switch 11 impedance measuring instrument
[8] 12: Amplifier 13: A / D Converter
[9] 14 microprocessor 15 keyboard
[10] 16: display screen 17: printer
[11] 18: load measuring sensor 19: amplifier
[12] 100: second electronic switch
[34] The present invention for achieving the above object is a plurality of electrodes each for contacting the human body, and flowing an alternating current between any two of the electrodes and read the voltage difference between any other two of the electrodes voltage An impedance measuring device for measuring impedance of each part of the human body by a current ratio, a microprocessor, and a first device installed in the measuring device main body to select electrical connection between the electrode and the impedance measuring device and controlled by the microprocessor; In the bioelectrical impedance measuring device comprising an electronic switch; And a second electronic switch controlled to be turned on and off only when an alternating current is flown by the microprocessor in the plurality of electrodes and the voltage difference is read.
[35] The present invention also provides a plurality of electrodes each for contacting the human body, and an alternating current flows between any two of the electrodes and reads the voltage difference between any two of the electrodes to determine the voltage difference. A living body including an impedance measuring device for measuring impedance for each part of a human body, a microprocessor, and an electronic switch installed in a measuring device main body and selected by the microprocessor to select an electrical connection between the electrode and the impedance measuring device. An electrical impedance measuring device comprising: The electronic switch may be installed in the plurality of electrodes to control the electronic switch to be turned on and off only when an alternating current flows through the microprocessor and when the voltage difference is read.
[36] The position where a plurality of electrodes are in contact with the right hand, the left hand, the right foot, the left foot each of the right palm, right thumb, left palm, left thumb, right forefoot, right forefoot, left forefoot and left forefoot It features.
[37] The present invention made as described above has a plurality of electrodes in contact with the human body is always in contact with the electronic switch inside the body composition analyzer does not have a path formed in the electronic switch installed in the electrode so that only contact when applying current and measuring the voltage difference By the on-off interruption, the current path with the body composition analyzer is not formed when the measurement is not performed, thereby preventing the occurrence of leakage current by the cable of the body composition analyzer.
[38] Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. In addition, the present embodiment is not intended to limit the scope of the present invention, but is presented by way of example only and the same parts as in the conventional configuration using the same reference numerals and names.
[39] 3 is a circuit configuration diagram of a body composition analyzer according to the present invention.
[40] As shown here, eight electrodes E1 to E8 are provided for contacting the right palm, right thumb, left palm, left thumb, right forefoot, right forefoot, left forefoot, and left forefoot, respectively. An alternating current flows between any two of the electrodes E1 to E8, and a voltage difference between any other two electrodes except for any two electrodes selected above from among the electrodes E1 to E8. Read the impedance measuring instrument 11 for measuring the impedance of each body part by the voltage-current ratio is installed. In order to select the electrical connection between the electrodes E1 to E8 and the impedance measuring instrument 11, a first electronic switch 10 controlled by the microprocessor 14 is installed inside the body composition analyzer.
[41] Then, a load measuring sensor 18 for measuring the weight of the subject is installed on the scaffold on which the subject is raised, a keyboard 15 for inputting the height, gender, and age of the subject, and an impedance measuring instrument 11. And amplifiers 12 and 19 and an A / D converter 13 for interfacing the load measuring sensor 18 to the microprocessor 14 are installed.
[42] In addition, a microprocessor 14 for processing data obtained from the impedance analyzer 11 and the keyboard 15 and controlling the first electronic switch 10 is provided.
[43] On the other hand, the second electronic switch 100 in the electrodes E1 to E8 for contacting the right palm, right thumb, left palm, left thumb, right forefoot, right back foot, left forefoot and left back foot, respectively. The microprocessor 14 is controlled to be turned on and off only when the AC current is sent by the microprocessor 14 and when the voltage difference is read, thereby preventing the leakage current through the cable of the body composition analyzer.
[44] Then, a display screen 16 for displaying data processed by the microprocessor 14 and a printer 17 for printing data processed by the microprocessor 14 are provided.
[45] The operation of the present invention made as described above will be described with reference to a circuit diagram for impedance measurement for each part of the human body through the body composition analyzer according to the present invention shown in FIG. 4.
[46] As shown here, the first electronic switch 100 installed inside the body composition analyzer is adjusted to switch current to flow through the electrodes E2 and E4, and to switch the voltage between the electrodes E1 and E5 to measure the resistance R1. Will be measured.
[47] Accordingly, the second electronic switches 102, 104, 101, and 105 installed in the electrodes E2, E4, E1, and E5 are turned on, and the second electronic switches 103, 106, which are provided in the other electrodes E3, E6, E7, and E8. 107 and 108 are turned off to prevent the current applied to the human body from flowing inside the body composition analyzer through other electrodes besides the electrode to be measured, thereby preventing leakage current leaking through the cable for the electrode so that accurate impedance can be measured. do.
[48] 5 is a table showing the results of measuring the impedance model for each measurement site by the prior art and the technique of the present invention.
[49] As shown here, for example, the resistance of the right arm is modeled as 300 Ω, and the actual resistance value is measured. As shown in the prior art, the maximum error is 5.3%, but when measured by the present technology, the error is 0.1% at the maximum. It shows that it is measured accurately.
[50] In other parts, the prior art shows an error of up to 5.8%, but in the technique of the present invention, it can be seen that it is accurately measured with almost no error at a maximum of 0.1%.
[51] On the other hand, the first electronic switch located inside the body composition analyzer is installed in a plurality of electrodes instead of installing a separate second electronic switch in the electrode, and on / off only when the AC current is sent by the microprocessor and the voltage difference is read. It can also be controlled.
[52] In addition, in the present embodiment, the body composition analyzer has been described as an example, but the same may be applied to the meridians diagnosers and pulse generators that measure current and voltage by contacting the body with electrodes.
[53] As described above, the present invention provides an apparatus for measuring impedance of a human body, by installing an electronic switch in each electrode in contact with the human body, thereby blocking a current path flowing from the electrode to the bioelectrical impedance measuring device in advance. By reducing the measurement error caused by the leakage current leaked through the cable has the advantage of increasing the accuracy by measuring the accurate impedance.

权利要求:
Claims (3)
[1" claim-type="Currently amended] A plurality of electrodes each for contacting the human body, and an alternating current flows between any two of the electrodes, and reads the voltage difference between any two of the electrodes to read the impedance of each part of the human body by the voltage-current ratio. A bioelectrical impedance measurement comprising an impedance measuring device for measuring a voltage, a microprocessor, and a first electronic switch installed in a measuring device main body and selected by the microprocessor to select an electrical connection between the electrode and the impedance measuring device. In an apparatus;
A second electronic switch installed in the plurality of electrodes and controlled to be turned on and off only when an alternating current is flown by the microprocessor and the voltage difference is read;
Bioelectrical impedance measuring apparatus, characterized in that further comprises.
[2" claim-type="Currently amended] A plurality of electrodes each for contacting the human body, and an alternating current flows between any two of the electrodes, and reads the voltage difference between any two of the electrodes to read the impedance of each part of the human body by the voltage-current ratio. In the bioelectrical impedance measuring device comprising an impedance measuring device for measuring a, a microprocessor, and an electronic switch installed in the main body of the measuring device to select an electrical connection of the electrode and the impedance measuring device is controlled by the microprocessor. In;
Installing said electronic switch in said plurality of electrodes so as to be turned on and off only when an alternating current is sent by said microprocessor and when the voltage difference is read;
A bioelectrical impedance measuring device.
[3" claim-type="Currently amended] The method of claim 1 or 2, wherein the plurality of electrodes are in contact with
Two positions each on the right hand, left hand, right foot, and left foot
Bioelectrical impedance measuring apparatus, characterized in that.

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同族专利:

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公开号 | 公开日

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KR100437488B1|2004-06-25|

引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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法律状态:
2001-05-30|Application filed by 주식회사 바이오스페이스

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2001-05-30|Priority to KR20010030205A

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2002-12-06|Publication of KR20020091488A

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2004-06-25|Application granted

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2004-06-25|Publication of KR100437488B1

优先权:

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申请号 | 申请日 | 专利标题

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KR20010030205A|KR100437488B1|2001-05-30|2001-05-30|Bioelectrical impedance analyzer|