Device for measuring the amount of water in a subject's body

• US 9,782,105 B2
• Filed: 02/13/2015
• Issued: 10/10/2017
• Est. Priority Date: 08/14/2012
• Status: Active Grant

• Current Assignee: Terumo Kabushiki Kaisha (Terumo Corporation)
• Original Assignee: Terumo Kabushiki Kaisha (Terumo Corporation)
• Inventors: Yoshino, Keisuke, Honda, Kei, Nishio, Kosuke, Kondou, Akira, Tsubouchi, Takeshi, Koyama, Miyuki
• Primary Examiner(s): Stout, Michael C
• Application Number:
  US14/622,222
• Publication Number:
  US 20150150479A1
• Time in Patent Office: 970 Days
• Field of Search: 600372, 600382-397, 600547, 600546, 600548
• CPC Class Codes: A61B 2560/0418 Pen-shaped housings
• CPC Class Codes: A61B 2562/029 Humidity sensors
• CPC Class Codes: A61B 2562/247 Hygienic covers, i.e. for covering the sensor or apparatus during use
• CPC Class Codes: A61B 5/0537 Measuring body composition by impedance, e.g. tissue hydration or fat content
• CPC Class Codes: A61B 5/4875 Hydration status, fluid retention of the body
• CPC Class Codes: G01N 33/18 Water

Abstract

A device (100) for measuring the amount of water in a subject'"'"'s body includes a main body part (110) formed in a linear shape and an insertion part (120) extending in a curved shape from one end of the main body part (100). The insertion part (120) includes a tip side insertion part (120-2) having a tip surface (122) to which a sensor unit (121) is fixed and a base end side insertion part (120-1), wherein the sensor unit (121) is brought into contact with a body surface of a subject through a slide mechanism. A protective member (651) liquid-tightly covers the slide mechanism between the tip side insertion part (120-2) and a base end side insertion part (120-1). The protective member (651) smoothly connects the outer peripheral surface of the tip side insertion part (120-2) and the outer peripheral surface of the base end side insertion part (120-1).

Claims

1. A device for measuring the amount of water in a subject'"'"'s body comprising:

a main body part formed in a linear shape; and

an insertion part extending in a curved shape from one end of the main body part, the insertion part including;

a tip side insertion part having a tip surface to which a sensor unit is fixed, wherein the sensor unit is brought into contact with a body surface of a subject to measure data regarding water in a subject'"'"'s body,

a base end side insertion part supporting the tip side insertion part through a slide mechanism, wherein the slide mechanism allows the tip side insertion part to slide in a direction substantially perpendicular to the tip surface, and

a protective member liquid-tightly covering the slide mechanism between the tip side insertion part and the base end side insertion part, wherein the protective member smoothly connects a first outer peripheral surface of the tip side insertion part, wherein the first outer peripheral surface is a first outer most surface that faces radial outward on an exterior of the tip insertion part, and a second outer peripheral surface of the base end side insertion part to each other, wherein the second outer peripheral surface is a second outer most surface that faces radial outward on an exterior of the base end side insertion part;

wherein at least a first groove is formed on the first outer peripheral surface of the tip side insertion part in a first region to which the protective member is connected over the whole circumference, at least a second groove is formed on the second outer peripheral surface of the base end side insertion part in a second region to which the protective member is connected over the whole circumference, and projections formed on ends of the protective member are fitted with the first and second grooves when the protective member is connected.

2. The device for measuring the amount of water in a subject'"'"'s body according to claim 1, wherein the protective member is made of one of an elastomer and a polyolefin.

3. The device for measuring the amount of water in a subject'"'"'s body according to claim 1, wherein the first groove has a first depth that corresponds to the thickness of a first end of the protective member, wherein the second groove has a second depth that corresponds to the thickness of a second end of the protective member.

4. The device for measuring the amount of water in a subject'"'"'s body according to claim 1, wherein the protective member extends and contracts in the slide direction.

5. The device for measuring the amount of water in a subject'"'"'s body according to claim 1, wherein the sensor unit measures capacitance with a CR circuit.

6. The device for measuring the amount of water in a subject'"'"'s body according to claim 1, wherein the protective member is bendable at a central position in the slide direction to release a force acting in the slide direction to a direction that differs from the slide direction.

7. The device for measuring the amount of water in a subject'"'"'s body according to claim 6, wherein the protective member is coated with a flourine resin.

8. The device for measuring the amount of water in a subject'"'"'s body according to claim 6, wherein the protective member eliminates a step or ridge between a tip surface and the sensor unit.

20. The device for measuring the amount of water in a subject'"'"'s body according to claim 2, wherein the one of the elastomer and the polyolefin is one of a silicone elastomer, a polyurethane elastomer, a styrene elastomer, and polyethylene.

9. An insertion part of a device for measuring an amount of water in a subject'"'"'s body, the insertion part comprising:

a tip side insertion part having a tip surface with a sensor unit, wherein the sensor unit is brought into contact with a body surface of the subject'"'"'s body to measure data regarding water in the subject'"'"'s body,

a base end side insertion part supporting the tip side insertion part through a slide mechanism, wherein the slide mechanism allows the tip side insertion part to slide in a direction substantially perpendicular to the tip surface, and

a protective member liquid-tightly covering the slide mechanism between the tip side insertion part and the base end side insertion part, wherein the protective member smoothly connects a first outer peripheral surface of the tip side insertion part, wherein the first outer peripheral surface is a first outer most surface that faces radial outward on an exterior of the tip insertion part, and a second outer peripheral surface of the base end side insertion part to each other, wherein the second outer peripheral surface is a second outer most surface that faces radial outward on an exterior of the base end side insertion part;

wherein a first groove having a first depth corresponding to the first thickness of a first end of the protective member is formed on the first outer peripheral surface of the tip side insertion part in a first region to which the protective member is connected over a whole circumference, wherein a second groove having a second depth corresponding to the second thickness of a second end of the protective member is formed on the second outer peripheral surface of the base end side insertion part in a second region to which the protective member is connected over the whole circumference, and the first and second ends of the protective member are fitted with the first and second grooves when the protective member is connected.

10. The insertion part according to claim 9, wherein the protective member is made of one of an elastomer and a polyolefin.

11. The insertion part according to claim 10, wherein the one of the elastomer and the polyolefin is one of a silicone elastomer, a polyurethane elastomer, a styrene elastomer, and polyethylene.

12. The insertion part according to claim 9, wherein the sensor unit measures capacitance with a CR circuit.

13. The insertion part according to claim 9, wherein the protective member is coated with a fluorine resin.

14. The insertion part according to claim 9, wherein the protective member eliminates a step or ridge between a tip surface and the sensor unit.

15. The insertion part according to claim 9, wherein the protective member bends one of substantially perpendicularly outward or substantially perpendicularly inward relative to the slide motion.

16. The insertion part according to claim 9, further comprising:

a sensor unit to measure an oscillatory frequency of an output signal;

a processor to;

detect an instruction to start the measurement;

receive the measured oscillatory frequency;

calculate the amount of water in a subject'"'"'s body based on the measured oscillatory frequency; and

determine, based on the calculated amount of water in a subject'"'"'s body, whether the subject is dehydrated.

17. The insertion part according to claim 16, further comprising a display to display the amount of water in a subject'"'"'s body.

18. A method for acquiring a measurement of an amount of water in a subject'"'"'s body using a device, the method comprising:

sliding a sensor unit fixed to a tip surface, of a tip side insertion part, into contact with a body surface of the subject'"'"'s body, wherein a base end side insertion part supports the tip side insertion part through a slide mechanism, wherein the slide mechanism allows the tip side insertion part to slide in a direction substantially perpendicular to the tip surface, and wherein a protective member liquid-tightly covers the slide mechanism between the tip side insertion part and the base end side insertion part, wherein the protective member smoothly connects a first outer peripheral surface of the tip side insertion part, wherein the first outer peripheral surface is a first outer most surface that faces radial outward on an exterior of the tip insertion part, and a second outer peripheral surface of the base end side insertion part to each other, wherein the second outer peripheral surface is a second outer most surface that faces radial outward on an exterior of the base end side insertion part;

a processor detecting an instruction to start the measurement;

the sensor unit measuring an oscillatory frequency of an output signal;

the processor receiving the measured oscillatory frequency;

the processor calculating the amount of water in a subject'"'"'s body based on the measured oscillatory frequency;

the processor determining, based on the calculated amount of water in a subject'"'"'s body, whether the subject is dehydrated; and

displaying the amount of water in a subject'"'"'s body on a display of the device.

19. The method according to claim 18, further comprising the protective member preventing the intrusion of water into the device.