Device to provide data as a guide to health management

• US 5,579,782 A
• Filed: 08/12/1994
• Issued: 12/03/1996
• Est. Priority Date: 08/12/1993
• Status: Expired due to Term

• Current Assignee: Omron Healthcare Company Limited (Omron Corporation)
• Original Assignee: Omron Corporation
• Inventors: Masuo, Yoshihisa
• Primary Examiner(s): Sykes, Angela D.
• Assistant Examiner(s): HUANG, STEPHEN D
• Application Number:
  US08/288,719
• Time in Patent Office: 844 Days
• Field of Search: 128/734, 128/639
• US Class Current: 600/547
• CPC Class Codes: A61B 5/0537 Measuring body composition by impedance, e.g. tissue hydration or fat content
• CPC Class Codes: A61B 5/4872 Body fat

Abstract

A high-frequency signal generator generates a signal passing from the subcutaneous fat layer toward both the deep and shallow tissue areas. A second high-frequency signal generator generates a signal that passes primarily toward the deeper tissue. Frequency switch unit is used to select a signal of one of the frequencies. This signal is applied across whichever two of electrodes are selected by electrode switch unit 32a. The impedance across the two limbs in contact with those electrodes is measured using the electrical potential derived at whichever two of the electrodes have been selected. From the impedance values and personal data such as weight and height, the visceral fat mass, subcutaneous-to-visceral fat ratio and other useful indicators are calculated.

Claims

1. A device to provide data as a guide to health management, comprising:

a main unit;

a pair of hand grips, connected to ends of said main unit, including first and second electrodes connected to apply a high-frequency signal and third and fourth electrodes connected to measure a resistance of a human body; and

a foot electrode unit, connected to said main unit, including fifth and sixth electrodes connected to apply a high-frequency signal, and a seventh connected to measure an electrical potential developed across said human body,

said main unit comprising;

a signal generator operable to produce a first high-frequency signal which passes through both a shallow part of the body where subcutaneous fat is located and a deeper part of body where visceral fat is located and a second high-frequency signal which passes mainly through the deeper part of the body,

an electrode selecting device including switches connected to establish connections to two of said electrodes;

a frequency selecting device connected to select which of said first or second high frequency signals will be applied between two or more of said first, second, fifth and sixth electrodes;

an impedance measuring device connected to measure an impedance between two or more of said third, fourth and seventh electrodes;

a calculating device connected to calculate a fat mass based on a relationship between an impedance measured by said impedance measuring device when said first high-frequency signal is applied and an impedance measured by said impedance measuring device when said second high-frequency signal is applied; and

a display device connected to display a result obtained by said calculating device.

2. A device as in claim 1, wherein said calculating device calculates values for total body fat mass and visceral fat mass, a value of subcutaneous fat mass, and a ratio of visceral to subcutaneous fat, and said calculating device including means for determining a type of obesity, indicating whether said obesity is of subcutaneous or visceral type, from said ratio of visceral fat mass to subcutaneous fat mass.

3. A device as in claim 1 wherein said main unit includes a top area, a bottom area, and said pair of hand grips extending between said top area and said bottom area, each said hand grip being of a substantially cylindrical shape, with said electrodes located on an outside of said cylindrical shape.

4. A device as in claim 1 wherein said foot electrode unit includes a substantially flat plate with raised portions thereon, said fifth, sixth and seventh electrodes being disposed on said raised portions.

5. A device as in claim 4 wherein said flat plate includes an opening therein, said opening shaped to allow a device underneath said flat plate to be seen therethrough.

6. A device as in claim 5 wherein said flat plate is shaped and disposed to fit over an operative surface of a bathroom scale, and said opening is of a shape to read a dial of said bathroom scale therethrough.

14. A device as in claim 1 further comprising means allowing entry of physical data about a subject, and wherein said calculating device calculates said fat mass based on said physical data.

7. A device to provide data as a guide to health management, comprising:

a main unit;

a pair of hand grips including first and second electrodes connected to apply a high-frequency signal and third and fourth electrodes connected to measure a resistance of a human body; and

a foot electrode unit, connected to said main unit, including fifth and sixth electrodes to apply a high-frequency signal, and seventh and eighth electrodes to measure an electrical potential developed across said human body,

said main unit comprising;

a high frequency generator, producing said high-frequency signal, which passes through both a shallow part of the body where subcutaneous fat is located and a deeper part of the body where visceral fat is located,

an electrode selecting device, including switches connected to establish connections that select two of said electrodes;

an impedance measuring device, connected to measure a first impedance between said third and fourth electrodes and a second impedance between said seventh and eighth electrodes;

an estimating device which estimates a ratio based on said first and second impedances; and

a calculating device to calculate a fat mass based on said ratio.

8. A device as in claim 7 wherein said main unit includes a top area, a bottom area, and said pair of hand grips extending between said top area and said bottom area, each said hand grip being of a substantially cylindrical shape with said electrodes located on an outside of the cylindrical shape.

9. A device as in claim 7 wherein said foot electrode unit includes a substantially flat plate with raised portions thereon, said fifth, sixth, seventh and eighth electrodes being disposed on said raised portions.

10. A device as in claim 9 wherein said flat plate includes an opening therein, said opening shaped to allow a device underneath said flat plate to be read therethrough.

11. A device as in claim 10 wherein said flat plate is shaped and disposed to fit over an operative surface of a bathroom scale, and said opening is of a shape to read a dial of said bathroom scale therethrough.

15. A device as in claim 7 further comprising means allowing entry of physical data about a subject, and wherein said calculating device calculates said fat mass based on said physical data.

12. A method of measuring body fat, comprising the steps of:

standing, with two feet, on two foot electrodes;

holding two hand electrodes, in respective hands, while standing;

producing a first high frequency electrical field which passes through a shallow part of a body, and producing a second high frequency electrical field of a different frequency than said first high frequency electrical field which passes through a deeper part of the body;

measuring impedances between said hand electrodes and said foot electrodes based on said first and second high frequency electrical fields; and

calculating masses of fat in the body based on said impedances.

13. A method as in claim 12 wherein said calculating step includes calculating a ratio between subcutaneous fat mass and visceral fat mass based on said impedances obtained while producing said first high frequency electrical field and said impedances obtained while producing said second high frequency electrical field.

16. A body fat detecting device, comprising:

a first pair of electrodes and a second pair of electrodes;

a hand held element having first and second hand grips at respective ends thereof, each of said first and second hand grips including thereon an electrode from each of said first pair of electrodes and said second pair of electrodes;

a signal generator configured to supply a high frequency signal to said first pair of electrodes;

means for determining an impedance between said second pair of electrodes;

a calculating device which calculates a fat mass based on said impedance; and

a display for displaying results calculated by said calculating device and located on said hand held element;

wherein top ends of said first and second grips are linked to a top of said hand held element and bottom ends of said first and second grips are linked to a bottom of said hand held element.

17. A device as in claim 16 further comprising means allowing entry of individual data about a subject, and wherein said calculating device is responsive to said individual data for calculating a fat mass.

18. A device as in claim 16 wherein said signal generator includes first means for supplying a first high frequency current, wherein said first high frequency current travels primarily towards external tissue, and second means for supplying a second high frequency current, wherein said second high frequency current travels primarily towards internal tissue.

19. A device as in claim 18 wherein said calculating device calculates a ratio between visceral fat mass and subcutaneous fat mass and uses said ratio to determine a type of obesity.