US5385143A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring predetermined data of living tissue
Assignee: Nihon Kohden Corp
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Filing: 1993-02-05
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Granted: 1995-01-31
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Expires: 2013-02-05
Abstract
Abstract Disclosed is an apparatus for measuring a predetermined data of a living tissue, such as an oxygen saturation, a dye dilution curve and level of hemoglobin. The apparatus has an illumination intensity computing and storing circuit that stores the intensities of light components emitted from a three-wavelength light source assembly, and a computing circuit that calculates the intensity ratios of illuminating light from the intensity data stored in the circuit. The circuit determines the predetermined data of blood on the basis of the calculated intensity ratios and the intensities of light transmitted through a living tissue under assay, and it displays the predetermined data on display unit. The apparatus is capable of measuring the predetermined data without relying upon pulsations that occur in the subject.
Inventors
- 👤 Takuo Aoyagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:18
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/145; A61B5/1455; A61B5/14551
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
149 words
An apparatus for measuring a predetermined data of living tissue comprising: a means for illuminating said living tissue with light emitting at at least three wavelengths; a photoelectric transducing means for receiving light transmitted through said tissue and for converting said light transmitted through said tissue to electric signals; a memory means for storing data of said illuminating light emitting at the three wavelengths, said illuminating light not transmitted through said living tissue; and a computing means for calculating said predetermined data of living tissue on the basis of the output from said photoelectric transducing device, representing light transmitted through said living tissue, and said data of illuminating light stored in said memory device, representing light not transmitted through said living tissue; wherein said computing means calculates ratios between intensities of illuminating light emitting at the three wavelengths on the basis of the data stored in said memory means.
Claim 2
Independent Claim
149 words
An apparatus for measuring a predetermined data of living tissue comprising: a means for illuminating said living tissue with light emitting at at least three wavelengths; a photoelectric transducing means for receiving light transmitted through said tissue and for converting said light transmitted through said tissue to electric signals; a memory means for storing data of said illuminating light emitting at the three wavelengths, said illuminating light not transmitted through said living tissue; and a computing means for calculating said predetermined data of living tissue on the basis of the output from said photoelectric transducing device, representing light transmitted through said living tissue, and said data of illuminating light stored in said memory device, representing light not transmitted through said living tissue; wherein said computing means calculates ratios between intensities of illuminating light emitting at the three wavelengths on the basis of the data stored in said memory means.
Claim 3
Dependent Claim
38 words
An apparatus for measuring a predetermined data of living tissue as claimed in claim 1, wherein said data includes ratios between intensities of said illuminating light emitting at the three wavelengths that are stored in said memory means.
Claim 4
Dependent Claim
36 words
An apparatus for measuring a predetermined data of living tissue as claimed in claim 1, wherein said data includes intensities of said illuminating light emitting at the three wavelengths that are stored in said memory means.
Claim 5
Dependent Claim
42 words
An apparatus for measuring a predetermined data of a living tissue as claimed in claim 1, wherein said illuminating means has a scattering plate, through which said light emitting at the three wavelengths is caused to pass before illuminating said living tissue.
Claim 6
Dependent Claim
34 words
An apparatus for measuring a predetermined data of a living tissue as claimed in claim 1, wherein the light from said illumination means is passed through a light attenuating plate having known attenuation characteristics.
Claim 7
Dependent Claim
38 words
An apparatus for measuring a predetermined data as claimed in claim 1, wherein said predetermined data includes at least one of an oxygen saturation of blood, the level of hemoglobin of blood in tissue and a pigment concentration.
Claim 8
Independent Claim
186 words
An apparatus for measuring a predetermined data of a living tissue comprising: a light generating means for generating light having at least two wavelengths; a photoelectric transducing means for converting said light emitted from said light generating means to electric signals, said photoelectric transducing means being spaced from said light generating means; an intensity ratio computing means for calculating the intensity ratio of the light components at respective wavelengths that are emitted from said light generating means on the basis of the signals output from said photoelectric transducing means and are not transmitted through living tissue; a memory means for storing the intensity ratio calculated by said intensity ratio computing means; and a computing means for performing predetermined calculations on the basis of both the output from said photoelectric transducing means, representing light components which are transmitted through living tissue, and the intensity ratio stored in said memory means, representing light components which are not transmitted through living tissue, when a living tissue is inserted in the space between said light generating means and said photoelectric transducing means, thereby determining a level of said predetermined data.
Claim 9
Independent Claim
186 words
An apparatus for measuring a predetermined data of a living tissue comprising: a light generating means for generating light having at least two wavelengths; a photoelectric transducing means for converting said light emitted from said light generating means to electric signals, said photoelectric transducing means being spaced from said light generating means; an intensity ratio computing means for calculating the intensity ratio of the light components at respective wavelengths that are emitted from said light generating means on the basis of the signals output from said photoelectric transducing means and are not transmitted through living tissue; a memory means for storing the intensity ratio calculated by said intensity ratio computing means; and a computing means for performing predetermined calculations on the basis of both the output from said photoelectric transducing means, representing light components which are transmitted through living tissue, and the intensity ratio stored in said memory means, representing light components which are not transmitted through living tissue, when a living tissue is inserted in the space between said light generating means and said photoelectric transducing means, thereby determining a level of said predetermined data.
Claim 10
Dependent Claim
62 words
An apparatus for measuring a predetermined data as claimed in claim 7 further comprising: a light attenuating plate having predetermined attenuation characteristics, wherein said intensity ratio computing means calculates the predetermined data on the basis of the signals output from said photoelectric transducing means when the said light attenuating plate is inserted between said light generating means and said photoelectric transducing means.
Claim 11
Dependent Claim
45 words
An apparatus for measuring a predetermined data of living tissue as claimed in claim 8 wherein said light generating means has a scattering plate, through which light components of the respective wavelengths are caused to pass before they are received by the photoelectric transducing means.
Claim 12
Dependent Claim
26 words
An apparatus for measuring a predetermined data of living tissue as claimed in claim 8, wherein said predetermined data include the level of hemoglobin or blood.
References Cited (Backward Citations)
US4586513A
Cited
US4819752A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-01-30 | 1998-08-01 | 1999-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-30 | 2002-08-01 | 2003-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-30 | 2006-08-01 | 2007-01-31 | $7700.00 | Window Closed / Lapsed |