US5529755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring a glucose concentration
Assignee: Minolta Co Ltd
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Filing: 1995-02-16
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Granted: 1996-06-25
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Expires: 2015-02-16
Abstract
Abstract A non-invasive glucose concentration measurement apparatus includes: a light source which projects at the sample radiation of a wavelength range including a wavelength at which absorption greatly changes with glucose concentration but does not greatly vary with temperature; a photosensor which receives the radiation which have been projected by the light source, and transmitted through or reflected by the sample, and generates an electrical signal corresponding to a through-transmitted or reflected level of the radiation of the wavelength; and a calculator which calculates a glucose concentration based on the electrical signal. A more accurate glucose concentration can be obtained without the influence of temperature.
Inventors
- 👤 Kimihiko Higashio
- 👤 Masahiro Ariizumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:16
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/145; A61B5/1455; A61B5/14532; A61B5/68; A61B5/6801; A61B5/6813; A61B5/6814; A61B5/6815; A61B5/6816; A61B5/6825; A61B5/6826; A61B5/683; A61B5/6838; G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/314; A61B5/6824; Y; Y10; Y10T; Y10T436/00; Y10T436/14; Y10T436/142222; Y10T436/143333; Y10T436/144444
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
180 words
An apparatus for noninvasively measuring a glucose concentration of a sample, the apparatus comprising: a first light source which projects at the sample radiation of a wavelength range including a first wavelength λ 1 at which absorption is dependent upon glucose concentration; a second light source which projects at the sample radiation of a wavelength range including a second wavelength λ 2 , different from the first wavelength λ 1 , at which absorption has a temperature-dependent characteristic correlated with that in absorption of radiation of the first wavelength λ 1 ; a photosensor which receives the two kinds of radiation which have been projected by the first and second light sources, and transmitted through or reflected by the sample, and generates a first electrical signal corresponding to a through-transmitted or reflected level of the radiation of the first wavelength λ 1 and a second electrical signal corresponding to a through-transmitted or reflected level of the radiation of the second wavelength λ 2 ; and a calculator which calculates a glucose concentration based on the first and second electrical signals.
Claim 2
Independent Claim
180 words
An apparatus for noninvasively measuring a glucose concentration of a sample, the apparatus comprising: a first light source which projects at the sample radiation of a wavelength range including a first wavelength λ 1 at which absorption is dependent upon glucose concentration; a second light source which projects at the sample radiation of a wavelength range including a second wavelength λ 2 , different from the first wavelength λ 1 , at which absorption has a temperature-dependent characteristic correlated with that in absorption of radiation of the first wavelength λ 1 ; a photosensor which receives the two kinds of radiation which have been projected by the first and second light sources, and transmitted through or reflected by the sample, and generates a first electrical signal corresponding to a through-transmitted or reflected level of the radiation of the first wavelength λ 1 and a second electrical signal corresponding to a through-transmitted or reflected level of the radiation of the second wavelength λ 2 ; and a calculator which calculates a glucose concentration based on the first and second electrical signals.
Claim 3
Dependent Claim
36 words
An apparatus according to claim 1, wherein the first wavelength λ1 lies within a range between 1560 nm and 1760 nm and the second wavelength λ2 lies within a range between 1440 nm and 1560 nm.
Claim 4
Dependent Claim
36 words
An apparatus according to claim 1, wherein the first wavelength λ1 lies within a range between 2080 nm and 2230 nm and the second wavelength λ2 lies within a range between 2050 nm and 2080 nm.
Claim 5
Dependent Claim
39 words
An apparatus according to claim 1, wherein the photosensor includes an optical filter for separately receiving the radiation of the wavelength range including the first wavelength λ1 and the radiation of the wavelength range including the second wavelength λ2.
Claim 6
Dependent Claim
77 words
An apparatus according to claim 1, further comprising a pressing device which presses the sample, wherein: the photosensor generates first and second electrical signals in a state of the sample being not pressed and first and second electrical signals in another state of the sample being pressed; and the calculator calculates a glucose concentration based on the first and second electrical signals in the non-pressed state and the first and second electrical signals in the pressed state.
Claim 7
Dependent Claim
41 words
An apparatus according to claim 1, wherein the calculator calculates a glucose concentration in consideration of a variation in the through-transmitted or reflected radiation which is caused by pulsation of blood at a measured portion when the sample is an organism.
Claim 8
Dependent Claim
36 words
An apparatus according to claim 1, wherein the first wavelength λ1 lies within a range between 2155 nm and 2225 nm and the second wavelength λ2 lies within a range between 1200 nm and 1300 nm.
Claim 9
Independent Claim
162 words
An apparatus for noninvasively measuring a glucose concentration of a sample, the apparatus comprising: a light source which projects at the sample radiation of a wavelength range including a first wavelength λ 1 at which absorption is dependent upon glucose concentration and a second wavelength λ 2 , different from the first wavelength λ 1 , at which absorption has a temperature-dependent characteristic correlated with that in absorption of radiation of the first wavelength λ 1 ; a photosensor which receives the two kinds of radiation which have been projected by the light source, and transmitted through or reflected by the sample, and generates a first electrical signal corresponding to a through-transmitted or reflected level of the radiation of the first wavelength λ 1 and a second electrical signal corresponding to a through-transmitted or reflected level of the radiation of the second wavelength λ 2 ; and a calculator which calculates a glucose concentration based on the first and second electrical signals.
Claim 10
Independent Claim
162 words
An apparatus for noninvasively measuring a glucose concentration of a sample, the apparatus comprising: a light source which projects at the sample radiation of a wavelength range including a first wavelength λ 1 at which absorption is dependent upon glucose concentration and a second wavelength λ 2 , different from the first wavelength λ 1 , at which absorption has a temperature-dependent characteristic correlated with that in absorption of radiation of the first wavelength λ 1 ; a photosensor which receives the two kinds of radiation which have been projected by the light source, and transmitted through or reflected by the sample, and generates a first electrical signal corresponding to a through-transmitted or reflected level of the radiation of the first wavelength λ 1 and a second electrical signal corresponding to a through-transmitted or reflected level of the radiation of the second wavelength λ 2 ; and a calculator which calculates a glucose concentration based on the first and second electrical signals.
Claim 11
Dependent Claim
36 words
An apparatus according to claim 8, wherein the first wavelength λ1 lies within a range between 1560 nm and 1760 nm and the second wavelength λ2 lies within a range between 1440 nm and 1560 nm.
Claim 12
Dependent Claim
36 words
An apparatus according to claim 8, wherein the first wavelength λ1 lies within a range between 2080 nm and 2230 nm and the second wavelength λ2 lies within a range between 2050 nm and 2080 nm.
Claim 13
Dependent Claim
39 words
An apparatus according to claim 8, wherein the photosensor includes an optical filter for separately receiving the radiation of the wavelength range including the first wavelength λ1 and the radiation of the wavelength range including the second wavelength λ2.
Claim 14
Dependent Claim
77 words
An apparatus according to claim 8, further comprising a pressing device which presses the sample, wherein: the photosensor generates first and second electrical signals in a state of the sample being not pressed and first and second electrical signals in another state of the sample being pressed; and the calculator calculates a glucose concentration based on the first and second electrical signals in the non-pressed state and the first and second electrical signals in the pressed state.
Claim 15
Dependent Claim
41 words
An apparatus according to claim 8, wherein the calculator calculates a glucose concentration in consideration of a variation in the through-transmitted or reflected radiation which is caused by pulsation of blood at a measured portion when the sample is an organism.
Claim 16
Dependent Claim
36 words
An apparatus according to claim 8, wherein the first wavelength λ1 lies within a range between 2155 nm and 2225 nm and the second wavelength λ2 lies within a range between 1200 nm and 1300 nm.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-06-25 | 1999-12-25 | 2000-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-06-25 | 2003-12-25 | 2004-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-06-25 | 2007-12-25 | 2008-06-25 | $7700.00 | Window Closed / Lapsed |