US3647299A
Expired / Lapsed
US
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Oximeter
Assignee: American Optical Corp
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Filing: 1970-04-20
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Granted: 1972-03-07
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Expires: 1990-04-20
Abstract
Abstract An oximeter having a single light-emitting diode structure capable of emitting the three wavelengths required for oximetry and dye dilution measurements. A ring counter causes three semiconductor chips in the device to be energized in sequence. Light is directed toward the blood sample and the reflected light is extended to three synchronous detectors. Each detector operates only when a corresponding semiconductor chip in the light-emitting diode is energized; each detector thus responds only to the intensity of light at a respective wavelength. The outputs of two of the detectors are extended to a ratio circuit for deriving a final measurement. The ratio circuit itself has a high accuracy over the relatively low dynamic range of the ratio values.
Inventors
- 👤 Robert G Lavallee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:36
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/483; G01N33/487; G01N33/49; G01N33/4925; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/314
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
210 words
An oximeter system comprising light-emitting diode means for selectively emitting light at three wavelengths required to perforM oximetry and dye dilution tests, means for sequentially controlling the emission of light at said three wavelengths from said light-emitting diode means, means for directing the light emitted from said light-emitting diode to a blood sample, first, second, and third means for detecting the intensity of the light scattered from said blood sample and for generating respective output signals, means for enabling the operation of each of said first, second, and third detecting means at the same time that a respective one of the light wavelengths is emitted from said light-emitting diode means, means responsive to the operation of said first, second, and third means for deriving a signal which is proportional to the ratio of the output signals generated by a selected two of said first, second and third detecting means, said signal deriving means including an amplifier, means for applying the output signal of said second detecting means to the input of said amplifier, means for varying the gain of said amplifier inversely with the output signal generated by a selected one of said first and third detecting means, and means for utilizing the signal at the output of said amplifier.
Claim 2
Dependent Claim
210 words
An oximeter system comprising light-emitting diode means for selectively emitting light at three wavelengths required to perforM oximetry and dye dilution tests, means for sequentially controlling the emission of light at said three wavelengths from said light-emitting diode means, means for directing the light emitted from said light-emitting diode to a blood sample, first, second, and third means for detecting the intensity of the light scattered from said blood sample and for generating respective output signals, means for enabling the operation of each of said first, second, and third detecting means at the same time that a respective one of the light wavelengths is emitted from said light-emitting diode means, means responsive to the operation of said first, second, and third means for deriving a signal which is proportional to the ratio of the output signals generated by a selected two of said first, second and third detecting means, said signal deriving means including an amplifier, means for applying the output signal of said second detecting means to the input of said amplifier, means for varying the gain of said amplifier inversely with the output signal generated by a selected one of said first and third detecting means, and means for utilizing the signal at the output of said amplifier.
Claim 3
Dependent Claim
59 words
An oximeter system in accordance with claim 1 wherein said light-emitting diode means includes a header, a first wire electrically connected to said header, three semiconductor chips mounted on said header each capable of emitting light at a different one of said three wavelengths when energized, and three wires each connected to a respective one of said semiconductor chips.
Claim 4
Dependent Claim
42 words
An oximeter system in accordance with claim 2 wherein said light-emitting diode means further includes a tapered light pipe mounted to extend outwardly from said semiconductor chips, the larger diameter end of said light pipe being disposed adjacent to said semiconductor chips.
Claim 5
Dependent Claim
61 words
An oximeter system in accordance with claim 3 wherein each of said three wires in said light-emitting diode means is extended through said header and further including insulative means mounted in said header for separating each of said three wires from said header, and optical-quality epoxy around said light pipe, and between said light pipe and said semiconductor chips and header.
Claim 6
Dependent Claim
94 words
An oximeter system in accordance with claim 1 wherein said gain-varying means includes a photodetector means whose impedance varies with the intensity of the light detected thereby and which controls the gain of said amplifier, light source means separate from said light detector means for illuminating said photodetector means, said light source means being operatively optically coupled to said photodetector means only, and means for controlling the intensity of the light emitted by said light source means in accordance with the selected one of the output signals of said first and third detecting means.
Claim 7
Dependent Claim
74 words
An oximeter system in accordance with claim 1 wherein said gain-varying means includes photodetector means whose impedance varies with the intensity of the light detected thereby and which controls the gain of said amplifier, light source means for illuminating said photodetector means, and means for controlling the intensity of the light emitted by said light source means in accordance with the selected one of the output signals of said first and third detecting means.
Claim 8
Dependent Claim
197 words
An oximeter system comprising light-emitting diode means for selectively emitting light at at least two wavelengths, means for sequentially controlling the intensity of the emission of light at said at least two wavelengths from said light-emitting diode means, means for directing the light emitted from said light-emitting diode means to a blood sample, at least two means for detecting the intensity of the light scattered from said blood sample and for generating respective output signals, means for enabling the operation of each of said at least two detecting means at the same time that a respective one of the light wavelengths is emitted from said light-emitting diode means, means responsive to the operation of said at least two means for deriving a signal which is proportional to the ratio of the output signals generated by two of said detecting means, said signal deriving means including an amplifier, means for applying the output signal of said one detecting means to the input of said amplifier, means for varying the gain of said amplifier inversely with the output signal generated by another one of said detecting means, and means for utilizing the signal at the output of said amplifier.
Claim 9
Dependent Claim
197 words
An oximeter system comprising light-emitting diode means for selectively emitting light at at least two wavelengths, means for sequentially controlling the intensity of the emission of light at said at least two wavelengths from said light-emitting diode means, means for directing the light emitted from said light-emitting diode means to a blood sample, at least two means for detecting the intensity of the light scattered from said blood sample and for generating respective output signals, means for enabling the operation of each of said at least two detecting means at the same time that a respective one of the light wavelengths is emitted from said light-emitting diode means, means responsive to the operation of said at least two means for deriving a signal which is proportional to the ratio of the output signals generated by two of said detecting means, said signal deriving means including an amplifier, means for applying the output signal of said one detecting means to the input of said amplifier, means for varying the gain of said amplifier inversely with the output signal generated by another one of said detecting means, and means for utilizing the signal at the output of said amplifier.
Claim 10
Dependent Claim
65 words
An oximeter system in accordance with claim 7 wherein said light-emitting diode means includes a header, a first wire electrically connected to said header, at least two semiconductor chips mounted on said header each capable of emitting light at a different one of said at least two wavelengths when energized, and at least two wires each connected to a respective one of said semiconductor chips.
Claim 11
Dependent Claim
42 words
An oximeter system in accordance with claim 8 wherein said light-emitting diode means further includes a tapered light pipe mounted to extend outwardly from said semiconductor chips, the larger diameter end of said light pipe being disposed adjacent to said semiconductor chips.
Claim 12
Dependent Claim
65 words
An oximeter system in accordance with claim 9 wherein each of said at least two wires in said light-emitting diode means is extended through said header and further including insulative means mounted in said header for separating each of said at least two wires from said header, and optical-quality epoxy around said light pipe, and between said light pipe and said semiconductor chips and header.
Claim 13
Dependent Claim
90 words
An oximeter system in accordance with claim 7 wherein said gain-varying means includes photodetector means whose impedance varies with the intensity of the light detected thereby and which controls the gain of said amplifier, light source means separate from said light detector means for illuminating said photodetector means, said light source means being operatively optically coupled to said photodetector means only, and means for controlling the intensity of the light emitted by said light source means in accordance with the output signal of said other one of said detecting means.
Claim 14
Dependent Claim
70 words
An oximeter system in accordance with claim 7 wherein said gain-varying means includes photodetector means whose impedance varies with the intensity of the light detected thereby and which controls the gain of said amplifier, light source means for illuminating said photodetector, and means for controlling the intensity of the light emitted by said light source means in accordance with the output signal of said other one of said detecting means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |