Fat analyzer
First Claim
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1. A bio-electrical impedance analyzer, comprising:
- a current pulse source outputting a constant pulse source signal and a synchronizing output signal;
electrode arrangement receiving said pulse source signal;
a measurement circuit for measuring resistivity across said electrode arrangement wherein said measured resistivity is the resistivity of a person in contact with said electrode arrangement; and
a processor circuit for receiving a resistivity output from said measuring circuit and for receiving said synchronized signal output from said pulse source circuit to provide a synchronized output determining the ratio of body fat to body mass of said person.
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Abstract
A four electrode bio-electrical impedance analyzer having a 45 KHz constant current pulse waveform and a synchronized detection scheme to measure the human body impedance and therefore calculate total body resistivity. The resistivity is used in conjunction with the pre-input data concerning characteristics of the person under tests to determine the percentage of body fat in a manner which is repeatable and which suppresses electrical interference.
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Citations
13 Claims
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1. A bio-electrical impedance analyzer, comprising:
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a current pulse source outputting a constant pulse source signal and a synchronizing output signal;
electrode arrangement receiving said pulse source signal;
a measurement circuit for measuring resistivity across said electrode arrangement wherein said measured resistivity is the resistivity of a person in contact with said electrode arrangement; and
a processor circuit for receiving a resistivity output from said measuring circuit and for receiving said synchronized signal output from said pulse source circuit to provide a synchronized output determining the ratio of body fat to body mass of said person. - View Dependent Claims (2, 3, 4, 5)
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6. A body fat analyzer, comprising:
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an electrical source providing a constant current between a first and a second electrode respectively positioned on right and left handgrips;
an electrical impedance measurement device including a third and a fourth electrode respectively positioned on said left and right handgrip for measuring resistivity of a person holding said left and right handgrip;
synchronizing means for receiving the output of said energy source and for outputting a synchronizing signal to a processor circuit for synchronizing the output of said impedance circuit with said energy source to provide an interference free ratio of body fat to body mass of said person. - View Dependent Claims (7, 8, 9)
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10. A method for determining the percentage of body fat in a tested person, comprising the steps of:
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applying an output of a constant energy source to a pair of handgrips;
measuring the resistivity of a person holding said handgrips during application of said energy source;
synchronizing said energy source with said resistivity measurement;
storing input data characteristic of said person;
calculating percentage of body fat of said person as a function of said stored data and said measured impedance whereby said measured percentage of body fat is free from electrical interference and provides essentially the same value when said method is repeated for the same tested person. - View Dependent Claims (11, 12, 13)
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Specification