US5146091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Body fluid constituent measurement utilizing an interference pattern
Assignee: Diabetes Diagnostics Inc
•
Filing: 1990-12-04
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Granted: 1992-09-08
•
Expires: 2010-12-04
Abstract
Abstract An apparatus is disclosed for measuring a body fluid constituent. In a preferred embodiment, the apparatus directs light against a tissue containing the constituent and detects an amount of light absorption in a reflected light from said tissue. The amount of absorption is analyzed to determine the amount of constituent in the blood within the tissue.
Inventors
- 👤 Mark B. Knudson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:18
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/145; A61B5/14532; A61B5/1455; A61B5/68; A61B5/6801; A61B5/6813; A61B5/6814; A61B5/6815; A61B5/6817
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
186 words
An apparatus for determining a level of a constituent in a body fluid contained within a body tissue, said apparatus comprising: light generating means for generating a beam of a source light including at least one wavelength absorbable by said constituents; light detecting means for receiving light and measuring an intensity of said light; beam splitting and directing means for splitting said source beam into at least a reference beam and a test beam with said reference beam directed toward said light detecting means and with said test beam directed toward said tissue for said test beam to be modified by at least partial absorption of said at least one wavelength by said constituent within said tissue and with said modified light reflected off said tissue toward said light detecting means, said modified light and said reference light at said light detecting means cooperating to generate an interference pattern corresponding at least in part to a level of said constituent within said tissue; processing means for receiving an output of said light detecting means and calculating said level of said constituent in response to said output.
Claim 2
Independent Claim
186 words
An apparatus for determining a level of a constituent in a body fluid contained within a body tissue, said apparatus comprising: light generating means for generating a beam of a source light including at least one wavelength absorbable by said constituents; light detecting means for receiving light and measuring an intensity of said light; beam splitting and directing means for splitting said source beam into at least a reference beam and a test beam with said reference beam directed toward said light detecting means and with said test beam directed toward said tissue for said test beam to be modified by at least partial absorption of said at least one wavelength by said constituent within said tissue and with said modified light reflected off said tissue toward said light detecting means, said modified light and said reference light at said light detecting means cooperating to generate an interference pattern corresponding at least in part to a level of said constituent within said tissue; processing means for receiving an output of said light detecting means and calculating said level of said constituent in response to said output.
Claim 3
Dependent Claim
23 words
An apparatus according to claim 1 comprising means for moving said tissue to vary an angle between said tissue and said light source.
Claim 4
Dependent Claim
18 words
An apparatus according to claim 1 comprising means for measuring a distance from said apparatus to said tissue.
Claim 5
Dependent Claim
15 words
An apparatus according to claim 1 comprising means for controlling a temperature of said tissue.
Claim 6
Dependent Claim
11 words
An apparatus according to claim 1 wherein said constituent is glucose.
Claim 7
Dependent Claim
44 words
An apparatus according to claim 1 wherein said light generating means, said light detecting means said beam splitting and directing means and said processing means are elements of a Fourier transform infrared spectrometry apparatus having said tissue as a moving mirror for said apparatus.
Claim 8
Independent Claim
186 words
An apparatus for determining a level of a constituent in a body fluid contained within a tympanic membrane, said apparatus comprising: light generating means for generating a beam of a source light including at least one wavelength absorbable by said constituents; light detecting means for receiving light and measuring an intensity of said light; beam splitting and directing means for splitting said source beam into at least a reference beam and a test beam with said reference beam directed toward said light detecting means and with said test beam directed toward said membrane for said test beam to be modified by at least partial absorption of said at least one wavelength by said constituent with said membrane and with said modified light reflected off said membrane toward said light detecting means, said modified light and said reference light at said light detecting means cooperating to generate an interference pattern corresponding at least in part to a level of said constituent within said membrane; processing means for receiving an output of said light detecting means and calculating said level of said constituent in response to said output.
Claim 9
Independent Claim
186 words
An apparatus for determining a level of a constituent in a body fluid contained within a tympanic membrane, said apparatus comprising: light generating means for generating a beam of a source light including at least one wavelength absorbable by said constituents; light detecting means for receiving light and measuring an intensity of said light; beam splitting and directing means for splitting said source beam into at least a reference beam and a test beam with said reference beam directed toward said light detecting means and with said test beam directed toward said membrane for said test beam to be modified by at least partial absorption of said at least one wavelength by said constituent with said membrane and with said modified light reflected off said membrane toward said light detecting means, said modified light and said reference light at said light detecting means cooperating to generate an interference pattern corresponding at least in part to a level of said constituent within said membrane; processing means for receiving an output of said light detecting means and calculating said level of said constituent in response to said output.
Claim 10
Dependent Claim
23 words
An apparatus according to claim 7 comprising means for moving said membrane to vary an angle between said membrane and said light source.
Claim 11
Dependent Claim
18 words
An apparatus according to claim 7 comprising means for measuring a distance from said apparatus to said membrane.
Claim 12
Dependent Claim
15 words
An apparatus according to claim 7 comprising means for controlling a temperature of said membrane.
Claim 13
Dependent Claim
11 words
An apparatus according to claim 7 wherein said constituent is glucose.
Claim 14
Dependent Claim
43 words
An apparatus to claim 7 wherein said light generating means, said light detecting means, said beam splitting and directing means and said processing means are elements of a Fourier transform infrared spectrometry apparatus having said membrane as a moving mirror for said apparatus.
References Cited (Backward Citations)
US2414747A
Cited
US3054893A
Cited
US3054397A
Cited
US3156117A
Cited
US3282106A
Cited
US3463142A
Cited
FR1526973A
Cited
US3825342A
Cited
US3878836A
Cited
US3949740A
Cited
US3958560A
Cited
US4014321A
Cited
US4086915A
Cited
US4169676A
Cited
US4223680A
Cited
US4195641A
Cited
GB2033575A
Cited
US4281646A
Cited
US4344438A
Cited
GB2055476A
Cited
US4427889A
Cited
US4407290A
Cited
US4407290B1
Cited
US4575237A
Cited
US4622974A
Cited
EP0160768B1
Cited
US4662360A
Cited
US4790324A
Cited
US4602642A
Cited
US4655225A
Cited
US4750830A
Cited
US4772561A
Cited
US4704029A
Cited
US4685463A
Cited
US4926867A
Cited
DE3619442A1
Cited
US4800886A
Cited
US4805623A
Cited
US4854699A
Cited
US4882493A
Cited
US4850365A
Cited
WO1989011825A1
Cited
DE3901749A1
Cited
EP0381608A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-08 | 1996-03-09 | 1996-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-08 | 2000-03-09 | 2000-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-08 | 2004-03-09 | 2004-09-08 | $7700.00 | Window Closed / Lapsed |