Body impedance measuring instrument
First Claim
1. A body impedance measurement apparatus including a measuring unit for supplying a weak current through a body of a subject from current-carrying electrodes attached to the body and measuring a voltage generated by the current with measuring electrodes attached to the body, and a calculating unit for calculating an impedance of the body from a value of the current supplied through the body and a value of the voltage measured, comprising:
- a) a power converter for converting AC power supplied from a commercial AC power supply to DC power;
b) a storage battery for storing the DC power and supplying the DC power as a driving power for the apparatus at least when the AC power is not supplied;
c) a power line opening/closing means for opening or closing a power line connecting the commercial AC power supply to the power converter or a power line connecting the power converter to the storage battery; and
d) a controller for opening the power line opening/closing means so that the driving power is supplied from the storage battery to each circuit of the apparatus at least during a period of time for measuring the voltage with the current supplied through the body.
1 Assignment
0 Petitions
Accused Products
Abstract
A relay 201 is provided for opening and closing the signal path connecting the measurement circuits and an electrode, and a relay 213 is provided for opening and closing a DC power line extending from an AC-DC adaptor 3 connected to a commercial AC power supply 5. In the measurement of the impedance, before supplying the current through the body of the subject, the relay 213 is opened to disconnect the commercial AC power supply 5 from a main unit 2 and a personal computer 1 so that the circuits are driven by the DC power from a battery 102. After that, the relay 201 is closed to connect the measuring circuit with the electrodes 10, 11, a weak current is passed through the body of the subject via the electrodes 10, and a voltage generated in the body by the current is measured with the electrodes 1. After the measurement, the relay 201 is opened, the relay 213 is closed, and body composition information is calculated and displayed by performing a calculation based on the measurement value of the impedance and body specific information. Thus, the muscle mass or other information of the subject can be accurately obtained, while electric shock is assuredly prevented during the measurement.
57 Citations
22 Claims
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1. A body impedance measurement apparatus including a measuring unit for supplying a weak current through a body of a subject from current-carrying electrodes attached to the body and measuring a voltage generated by the current with measuring electrodes attached to the body, and a calculating unit for calculating an impedance of the body from a value of the current supplied through the body and a value of the voltage measured, comprising:
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a) a power converter for converting AC power supplied from a commercial AC power supply to DC power;
b) a storage battery for storing the DC power and supplying the DC power as a driving power for the apparatus at least when the AC power is not supplied;
c) a power line opening/closing means for opening or closing a power line connecting the commercial AC power supply to the power converter or a power line connecting the power converter to the storage battery; and
d) a controller for opening the power line opening/closing means so that the driving power is supplied from the storage battery to each circuit of the apparatus at least during a period of time for measuring the voltage with the current supplied through the body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A body impedance measurement apparatus including a measuring unit for supplying a weak current through a body of a subject from current-carrying electrodes attached to the body and measuring a voltage generated by the current with measuring electrodes attached to the body, and a calculating unit for calculating an impedance of the body from the value of the current supplied through the body and the value of the voltage measured, wherein:
the same number of the current-carrying electrodes and the measuring electrodes are used, each current-carrying electrode is paired with each measuring electrode, a first wire of a cable constructed as a balanced type shield wire is used as a signal line for connecting the current-carrying electrode and a measuring circuit unit, a second wire of the cable is used as a signal line for connecting the measuring electrode and the measuring circuit unit, and a plurality of the cables have the same specifications. - View Dependent Claims (12, 13, 14)
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15. A body impedance measurement apparatus including a measuring unit for supplying a weak current through a body of a subject from current-carrying electrodes attached to the body and measuring a voltage generated by the current with measuring electrodes attached to the body, and a calculating unit for calculating an impedance of the body from a value of the current supplied through the body and a value of the voltage measured, wherein:
an input impedance of the measuring unit observed from the measuring electrode is measured by using a reference resistance and capacitance determined beforehand, a correction formula for canceling an influence of the input impedance is created from the input impedance measured and the reference resistance and capacitance, and the calculating unit corrects the value of the impedance calculated on the basis of a result of a measurement by the measuring unit by using the correction formula. - View Dependent Claims (16, 17)
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18. A body impedance measurement apparatus including a measuring unit for supplying a weak current through a body of a subject from current-carrying electrodes attached to the body and measuring a voltage generated by the current with measuring electrodes attached to the body, and a calculating unit for calculating an impedance of the body from a value of the current supplied through the body and a value of the voltage measured, wherein:
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a measuring circuit unit of the measuring unit is enclosed in a rectangular body casing, and a predetermined control program is executed on a notebook-size personal computer to implement a calculation process of the calculating unit, and the body casing has, on the top thereof, a recess capable of containing a peripheral device to be connected to the notebook-size personal computer, and the notebook-size personal computer can be placed on the top of the body casing with the peripheral device contained in the recess. - View Dependent Claims (19, 20, 21, 22)
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Specification