BODY COMPOSITION MONITOR CAPABLE OF ACCURATELY MEASURING WHOLE-BODY COMPOSITION AND ACHIEVING FACILITATED MANIPULATION

• US 20100106045A1
• Filed: 09/19/2006
• Published: 04/29/2010
• Est. Priority Date: 12/28/2005
• Status: Active Grant

• Current Assignee: Omron Healthcare Company Limited (Omron Corporation)
• Original Assignee: Omron Healthcare Company Limited (Omron Corporation)
• Inventors: Sato, Tetsuya, Tanaka, Koichi
• Granted Patent: US 8,666,485 B2
• Time in Patent Office: Days
• 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 5/4869 Determining body composition
• CPC Class Codes: A61B 5/6825 Hand
• CPC Class Codes: A61B 5/6829 Foot or ankle

Abstract

A detection portion for detecting a first potential difference between hand and foot by applying a current across the hand and the foot of a subject through both of a hand electrode and a foot electrode and detecting a second potential difference between both hands or between both feet by applying a current across both hands or across both feet of the subject through any one of the hand electrodes and the foot electrodes, a first body composition calculation portion for calculating a first whole-body composition by using whole-body impedance based on a result of detection of the first potential difference, a correction portion for correcting two-limb impedance based on a result of detection of the second potential difference, and a second body composition calculation portion for calculating a second whole-body composition by using the corrected two-limb impedance are included.

Claims

1. A body composition monitor for measuring whole-body composition of a subject, comprising:

a plurality of hand electrodes and a plurality of foot electrodes;

a detection portion for detecting a first potential difference between a hand and a foot by applying a current across the hand and the foot of said subject through both of said hand electrode and said foot electrode and detecting a second potential difference between both hands or between both feet by applying a current across said both hands or across said both feet of said subject through any one of said hand electrodes and said foot electrodes;

a first body composition calculation portion for calculating first whole-body composition using whole-body impedance based on a result of detection of said first potential difference;

a correction portion for correcting two-limb impedance based on a result of detection of said second potential difference; and

a second body composition calculation portion for calculating second whole-body composition using said two-limb impedance corrected by said correction portion.

2. The body composition monitor according to claim 1, wherein

said first body composition calculation portion calculates said first whole-body composition of said subject based on said whole-body impedance, body information of said subject, and a prescribed first estimation equation showing relation among said whole-body impedance, said body information and said whole-body composition, and

said body composition monitor further comprises a third body composition calculation portion for calculating third whole-body composition of said subject based on said two-limb impedance based on said second potential difference detected in detection of said first potential difference, said body information of said subject, and a prescribed second estimation equation showing relation among said two-limb impedance, said body information and said whole-body composition,

a correction value calculation portion for calculating such a correction value for said two-limb impedance that said first whole-body composition is equal to said third whole-body composition, and

a storage portion for storing data of said correction value as correlation information.

3. The body composition monitor according to claim 2, wherein

said correction portion corrects said two-limb impedance based on the data of said correction value, and

said second body composition calculation portion calculates said second whole-body composition of said subject based on corrected said two-limb impedance, said body information of said subject, and said second estimation equation.

4. The body composition monitor according to claim 3, further comprising a differential value determination portion for determining whether a differential value between said first whole-body composition and said third whole-body composition is equal to or smaller than a prescribed threshold value, wherein

said correction value calculation portion calculates said correction value when said differential value determination portion determines that said differential value exceeds said threshold value.

5. The body composition monitor according to claim 3, further comprising:

a time keeping portion for keeping time; and

a time zone determination portion for determining a time zone based on data output from said time keeping portion, wherein

said storage portion stores the data of said correction value in association with the time zone in which said detection portion detects said first potential difference.

6. The body composition monitor according to claim 3, further comprising a time keeping portion for keeping time, wherein

said storage portion stores the data of said correction value in association with a time in which said detection portion detects said first potential difference.

7. The body composition monitor according to claim 5 or 6, wherein

said correction portion corrects said two-limb impedance based on the data of said correction value corresponding to the time zone in which said detection portion detects said second potential difference.

8. The body composition monitor according to claim 1, wherein

said first body composition calculation portion calculates said first whole-body composition of said subject based on said whole-body impedance, body information of said subject, and a prescribed estimation equation showing relation among said whole-body impedance, said body information and said whole-body composition, and

said body composition monitor further comprises

a correlation calculation portion for calculating correlation between said whole-body impedance and said two-limb impedance based on said second potential difference detected in detection of said first potential difference, and

a storage portion for storing correlation data representing said correlation as correlation information.

9. The body composition monitor according to claim 8, wherein

said correction portion corrects said two-limb impedance based on said correlation data, and

said second body composition calculation portion calculates said second whole-body composition based on corrected said two-limb impedance, said body information of said subject, and said estimation equation.

10. The body composition monitor according to claim 9, further comprising:

a time keeping portion for keeping time; and

a time zone determination portion for determining a time zone based on data output from said time keeping portion, wherein

said storage portion stores said correlation data in association with the time zone in which said detection portion detects said first potential difference.

11. The body composition monitor according to claim 9, further comprising a time keeping portion for keeping time, wherein

said storage portion stores said correlation data in association with a time in which said detection portion detects said first potential difference.

12. The body composition monitor according to claim 10 or 11, wherein

said correction portion corrects said two-limb impedance based on said correlation data corresponding to the time zone in which said detection portion detects said second potential difference.

13. The body composition monitor according to claim 2 or 8, further comprising a selection portion for selecting execution of any of processing in said first body composition calculation portion and processing in said second body composition calculation portion.

14. The body composition monitor according to claim 13, wherein

said selection portion includes a contact sensing portion for sensing a state of contact of said hand electrode and said foot electrode with a body of said subject, and

said selection portion selects execution of processing in said first body composition calculation portion when said contact sensing portion senses contact of both of said hand electrode and said foot electrode with said body and selects execution of processing in said second body composition calculation portion when said contact sensing portion senses contact of any one of said hand electrode and said foot electrode with said body.

15. The body composition monitor according to claim 13, further comprising:

a first unit provided with said hand electrode, said detection portion, said storage portion, said first body composition calculation portion, and said second body composition calculation portion, that can be gripped with said both hands of said subject;

a second unit provided with said foot electrode, on which said both feet of said subject can be placed; and

a cable for establishing electrical connection between said first unit and said second unit, said cable being attachable/detachable to/from said first unit or said second unit, wherein

said selection portion has a connection sensing portion for sensing whether said cable is connected to said first unit or said second unit, and

said selection portion selects execution of processing in said first body composition calculation portion when said connection sensing portion senses connection and selects execution of processing in said second body composition calculation portion for said both hands when said connection sensing portion senses absence of connection.

16. The body composition monitor according to claim 13, further comprising:

a first unit provided with said hand electrode, that can be gripped with said both hands of said subject;

a second unit provided with said foot electrode, on which said both feet of said subject can be placed, said second unit including a housing portion for housing said first unit and a housing sensing portion for sensing whether said first unit is housed in said housing portion; and

a cable for establishing electrical connection between said first unit and said second unit, wherein

said selection portion selects execution of said second body composition calculation portion when said housing sensing portion senses housing and selects execution of processing in said first body composition calculation portion for said both feet when said housing sensing portion senses absence of housing.

17. The body composition monitor according to claim 13, further comprising:

a determination portion for determining whether said storage portion has stored said correlation information when said selection portion selects execution of said second body composition calculation portion; and

a notification portion for giving notification to urge said subject of use in a mode corresponding to execution of the processing in said first body composition calculation portion when said determination portion determines that said correlation information has not been stored.

18. The body composition monitor according to claim 13, further comprising:

a determination portion for determining whether said storage portion has stored said correlation information when said selection portion selects execution of the processing in said second body composition calculation portion; and

a notification portion for notifying said subject of prohibition of use in a mode corresponding to execution of the processing in said second body composition calculation portion when said determination portion determines that said correlation information has not been stored.

19. The body composition monitor according to claim 13, further comprising:

a time keeping portion for keeping time and day, said correlation information being stored in said storage portion in association with time and day when said correlation information was set;

a determination portion for determining whether a prescribed time period has elapsed since said time and day stored in said storage portion, when said selection portion selects execution of the processing in said second body composition calculation portion; and

a notification portion for notifying said subject of prohibition of use in a mode corresponding to execution of the processing in said second body composition calculation portion when said determination portion determines that said time period has elapsed.

20. The body composition monitor according to claim 13, further comprising:

a determination portion for determining whether said storage portion has stored said correlation information when said selection portion selects execution of said second body composition calculation portion; and

a notification portion for notifying that correction processing by said correction portion is not applicable in presenting calculated said second whole-body composition to said subject, when said determination portion determines that said correlation information has not been stored.

21. The body composition monitor according to claim 2 or 8, further comprising:

a first unit provided with said hand electrode, that can be gripped with said both hands of said subject;

a second unit provided with said foot electrode, on which said both feet of said subject can be placed, said second unit including a weight measurement portion for measuring weight out of said body information; and

a weight storage portion for storing said weight measured by said weight measurement portion, wherein

said second body composition calculation portion calculates said second whole-body composition of said subject by reading said weight stored in said weight storage portion.

22. A body composition monitor for measuring whole-body composition of a subject, comprising:

a plurality of hand electrodes and a plurality of foot electrodes;

a detection portion for detecting a first potential difference between a hand and a foot by applying a current across the hand and the foot of said subject through both of said hand electrode and said foot electrode and detecting a second potential difference between both hands or between both feet by applying a current across said both hands or across both said feet of said subject through any one of said hand electrodes and said foot electrodes;

a first body composition calculation portion for calculating first whole-body composition using whole-body impedance based on a result of detection of said first potential difference;

a second body composition calculation portion for calculating second whole-body composition using two-limb impedance based on a result of detection of said second potential difference; and

a correction portion for correcting calculated said second whole-body composition based on correlation information representing relation between said first whole-body composition and said second whole-body composition.

23. The body composition monitor according to claim 22, wherein

said first body composition calculation portion calculates said first whole-body composition of said subject based on said whole-body impedance, body information of said subject, and a prescribed first estimation equation showing relation among said whole-body impedance, said body information and said whole-body composition,

said second body composition calculation portion calculates said second whole-body composition of said subject based on said two-limb impedance, said body information of said subject, and a prescribed second estimation equation showing relation among said two-limb impedance, said body information and said whole-body composition, and

said body composition monitor further comprises

a correlation calculation portion for calculating correlation between said first whole-body composition and said second whole-body composition based on said second potential difference detected in detection of said first potential difference, and

a storage portion for storing said correlation data representing said correlation as said correlation information.

24. The body composition monitor according to claim 23, further comprising:

a time keeping portion for keeping time; and

a time zone determination portion for determining a time zone based on data output from said time keeping portion, wherein

said storage portion stores said correlation data in association with the time zone in which said detection portion detects said first potential difference.

25. The body composition monitor according to claim 23, further comprising a time keeping portion for keeping time, wherein

said storage portion stores said correlation data in association with a time in which said detection portion detects said first potential difference.

26. The body composition monitor according to claim 24 or 25, wherein

said correction portion corrects said second whole-body composition based on said correlation data corresponding to the time zone in which said detection portion detects said second potential difference.

27. The body composition monitor according to claim 23, further comprising a selection portion for selecting execution of any of processing in said first body composition calculation portion and processing in said second body composition calculation portion.

28. The body composition monitor according to claim 27, wherein

said selection portion includes a contact sensing portion for sensing a state of contact of said hand electrode and said foot electrode with a body of said subject, and

said selection portion selects execution of processing in said first body composition calculation portion when said contact sensing portion senses contact of both of said hand electrode and said foot electrode with said body and selects execution of processing in said second body composition calculation portion when said contact sensing portion senses contact of any one of said hand electrode and said foot electrode with said body.

29. The body composition monitor according to claim 27, further comprising:

a first unit provided with said hand electrode, said detection portion, said storage portion, said first body composition calculation portion, and said second body composition calculation portion, that can be gripped with said both hands of said subject;

a second unit provided with said foot electrode, on which said both feet of said subject can be placed; and

a cable for establishing electrical connection between said first unit and said second unit, said cable being attachable/detachable to/from said first unit or said second unit, wherein

said selection portion has a connection sensing portion for sensing whether said cable is connected to said first unit or said second unit, and

said selection portion selects execution of processing in said first body composition calculation portion when said connection sensing portion senses connection and selects execution of processing in said second body composition calculation portion for said both hands when said connection sensing portion senses absence of connection.

30. The body composition monitor according to claim 27, further comprising:

a first unit provided with said hand electrode, that can be gripped with said both hands of said subject;

a second unit provided with said foot electrode, on which said both feet of said subject can be placed, said second unit including a housing portion for housing said first unit and a housing sensing portion for sensing whether said first unit is housed in said housing portion; and

a cable for establishing electrical connection between said first unit and said second unit, wherein

said selection portion selects execution of said second body composition calculation portion when said housing sensing portion senses housing and selects execution of processing in said first body composition calculation portion for said both feet when said housing sensing portion senses absence of housing.

31. The body composition monitor according to claim 27, further comprising:

a determination portion for determining whether said storage portion has stored said correlation information when said selection portion selects execution of said second body composition calculation portion; and

a notification portion for giving notification to urge said subject of use in a mode corresponding to execution of the processing in said first body composition calculation portion when said determination portion determines that said correlation information has not been stored.

32. The body composition monitor according to claim 27, further comprising:

a determination portion for determining whether said storage portion has stored said correlation information when said selection portion selects execution of the processing in said second body composition calculation portion; and

a notification portion for notifying said subject of prohibition of use in a mode corresponding to execution of the processing in said second body composition calculation portion when said determination portion determines that said correlation information has not been stored.

33. The body composition monitor according to claim 27, further comprising:

a time keeping portion for keeping time and day, said correlation information being stored in said storage portion in association with time and day when said correlation information was set;

a determination portion for determining whether a prescribed time period has elapsed since said time and day stored in said storage portion, when said selection portion selects execution of the processing in said second body composition calculation portion; and

a notification portion for notifying said subject of prohibition of use in a mode corresponding to execution of the processing in said second body composition calculation portion when said determination portion determines that said time period has elapsed.

34. The body composition monitor according to claim 27, further comprising:

a determination portion for determining whether said storage portion has stored said correlation information when said selection portion selects execution of said second body composition calculation portion; and

a notification portion for notifying that correction processing by said correction portion is not applicable in presenting calculated said second whole-body composition to said subject, when said determination portion determines that said correlation information has not been stored.

35. The body composition monitor according to claim 23, further comprising:

a first unit provided with said hand electrode, that can be gripped with said both hands of said subject;

a second unit provided with said foot electrode, on which said both feet of said subject can be placed, said second unit including a weight measurement portion for measuring weight out of said body information; and

a weight storage portion for storing said weight measured by said weight measurement portion, wherein

said second body composition calculation portion calculates said second whole-body composition of said subject by reading said weight stored in said weight storage portion.