EP0286142A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Reflection type oximeter
Assignee: Sumitomo Electric Industries Ltd
•
Filing: 1988-04-11
•
Granted: —
•
Expires: 2008-04-11
Abstract
Abstract A reflection type oximeter comprises light emitting diodes (11 to 16) as first to sixth light sources which emit first and second beams of a wavelength involving a change in absorption due to a change in oxygen saturation of hemoglobin in blood of a tissue of a living body, third and fourth beams of another wavelength involving no change in absorption, and fifth and sixth beams of a further wavelength involving a relatively small change in absorption due to changes in a quantity of hemoglobin and oxygen saturation. Those beams are applied to the tissue (50) of the living body and the beams of the first to sixth light sources reflected therefrom are received by a light receiving element (17). Intensities of the beams emitted from the light emitting diodes are set to predetermined levels and the intensities of the beams received by the light receiving element are evaluated by a CPU (23) and, based on a predetermined function, the quantity of hemoglobin and the oxygen saturation of the tissue are evaluated. Those evaluated values are displayed on a display portion (26) and printed by a printer (27).
Inventors
- 👤 Setsuo Takatani
- 👤 Kunio C/O Osaka Works Awazu
- 👤 Masahiko C/O Osaka Works Kanda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 18:57
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/145; A61B5/1455; A61B5/14551; A61B5/14552; G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01N21/314; G01N21/3151; A61B2562/00; A61B2562/02; A61B2562/0233; A61B2562/0242; G01N2021/3144; G01N2021/3148; G01N2021/3181; G01N21/47; G01N2021/4704; G01N2021/4709
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
159 words
A reflection type oximeter comprising: beam source means (11 to 16) for applying, to a tissue of a living body, first and second beams of a wavelength involving a change in absorbance due to a change in oxygen saturation of hemoglobin in blood of said tissue, third and fourth beams of another wavelength involving no change in absorbance, and fifth and sixth beams of a further wavelength involving a relatively small change in absorbance due to changes in a quantity of hemoglobin and oxygen saturation, beam receiving means for detecting said first, second, third, fourth, fifth and sixth beams reflected from said tissue, evaluation means for evaluating intensities of said first, second, third, fourth, fifth and sixth beams reflected from said tissue based on an output of said beam receiving means and evaluating the quantity of hemoglobin in said tissue based on a predetermined function, and output means (26,27) for outputting results of the evaluation of said evaluating means.
Claim 2
Dependent Claim
159 words
A reflection type oximeter comprising: beam source means (11 to 16) for applying, to a tissue of a living body, first and second beams of a wavelength involving a change in absorbance due to a change in oxygen saturation of hemoglobin in blood of said tissue, third and fourth beams of another wavelength involving no change in absorbance, and fifth and sixth beams of a further wavelength involving a relatively small change in absorbance due to changes in a quantity of hemoglobin and oxygen saturation, beam receiving means for detecting said first, second, third, fourth, fifth and sixth beams reflected from said tissue, evaluation means for evaluating intensities of said first, second, third, fourth, fifth and sixth beams reflected from said tissue based on an output of said beam receiving means and evaluating the quantity of hemoglobin in said tissue based on a predetermined function, and output means (26,27) for outputting results of the evaluation of said evaluating means.
Claim 3
Dependent Claim
58 words
A reflection type oximeter in accordance with claim 1, further comprising mode selection means (282, 283) for selection between a calibration mode for performing calibration to set the intensities of the beams emitted from said beam source means within predetermined ranges and a measurement mode for evaluating the quantity of hemoglobin in said tissue by said evaluation means.
Claim 4
Dependent Claim
62 words
A reflection type oximeter in accordance with claim 2, further comprising voltage setting means (21, 22) for setting a voltage to be applied to said beam source means in response to selection of the calibration mode by said selection means, to cause the intensities of the first to sixth beams emitted from said beam source means to be within the predetermined ranges.
Claim 5
Dependent Claim
64 words
A reflection type oximeter in accordance with claim 1, further comprising means (23) for calculating an average value of signals of each of said first to sixth beams received by said beam receiving means by a plural number of times, said evaluation means including means (23) for evaluating the quantity of hemoglobin in said tissue based on said average value and a predetermined function.
Claim 6
Dependent Claim
87 words
A reflection type oximeter in accordance with claim 1, wherein said beam source means comprises first to sixth beam sources for emitting said first to sixth beams, said first, third and fifth beam sources are located at positions distant from a center of said beam receiving means by a predetermined distance d1, and said second, fourth and sixth beam sources are located at positions distant from the center of said beam receiving means by a predetermined distance d2, with a relation of d1 < d2 being maintained.
Claim 7
Dependent Claim
66 words
A reflection type oximeter in accordance with claim 1, wherein said evaluation means comprises means for evaluating the quantity of hemoglobin in said tissue by the expression: C1[log(P3/P4)]² + C2log(P3/P4) + C3 where P1, P2, P3, P4, P5 and P6 are the intensities of the first, second, third, fourth, fifth and sixth beams reflected from said tissue, respectively, and C1, C2 and C3 are correction values.
Claim 8
Dependent Claim
161 words
A reflection type oximeter comprising: beam source means (11 to 16) for applying, to a tissue of a living body, first and second beams of a wavelength involving a change in absorbance due to a change in oxygen saturation of hemoglobin in blood of said tissue, third and fourth beams of another wavelength involving no change in absorbance, and fifth and sixth beams of a further wavelength involving a relatively small change in absorbance due to changes in a quantity of hemoglobin and oxygen saturation, beam receiving means (17) for detecting said first, second, third, fourth, fifth and sixth beams reflected from said tissue, evaluation means (23) for evaluating intensities of said first, second, third, fourth, fifth and sixth beams reflected from said tissue based on an output of said beam receiving means and evaluating the oxygen saturation of said tissue based on a predetermined function, and output means (26, 27) for outputting results of the evaluation by said evaluation means.
Claim 9
Dependent Claim
161 words
A reflection type oximeter comprising: beam source means (11 to 16) for applying, to a tissue of a living body, first and second beams of a wavelength involving a change in absorbance due to a change in oxygen saturation of hemoglobin in blood of said tissue, third and fourth beams of another wavelength involving no change in absorbance, and fifth and sixth beams of a further wavelength involving a relatively small change in absorbance due to changes in a quantity of hemoglobin and oxygen saturation, beam receiving means (17) for detecting said first, second, third, fourth, fifth and sixth beams reflected from said tissue, evaluation means (23) for evaluating intensities of said first, second, third, fourth, fifth and sixth beams reflected from said tissue based on an output of said beam receiving means and evaluating the oxygen saturation of said tissue based on a predetermined function, and output means (26, 27) for outputting results of the evaluation by said evaluation means.
Claim 10
Dependent Claim
55 words
A reflection type oximeter in accordance with claim 7, further comprising mode selection means for selection between a calibration mode for performing calibration to set the intensities of the beams emitted from said beam source means within predetermined ranges and a measurement mode for evaluating the oxygen saturation of said tissue by said evaluation means.
Claim 11
Dependent Claim
62 words
A reflection type oximeter in accordance with claim 8, further comprising voltage setting means (21, 22) for setting a voltage to be applied to said beam source means in response to selection of the calibration mode by said selection means, to cause the intensities of said first to sixth beams emitted from said beam source means to be within the predetermined ranges.
Claim 12
Dependent Claim
63 words
A reflection type oximeter in accordance with claim 7, further comprising means (23) for calculating an average value of signals of each of said first to sixth beams received by said beam receiving means by a plural number of times, said evaluation means including means (23) for evaluating the oxygen saturation of said tissue based on said average value and said predetermined function.
Claim 13
Dependent Claim
87 words
A reflection type oximeter in accordance with claim 7, wherein said beam source means comprises first to sixth beam sources for emitting said first to sixth beams, said first, third and fifth beam sources are located at positions distant from a center of said beam receiving means by a predetermined distance d1, and said second, fourth and sixth beam sources are located at positions distant from the center of said beam receiving means by a predetermined distance d2, with a relation of d1 < d2 being maintained.
Claim 14
Dependent Claim
59 words
A reflection type oximeter in accordance with claim 7, wherein said evaluation means comprises means for evaluating the oxygen saturation of said tissue by the expression: where P1, P2, P3, P4, P5 and P6 are the intensities of the first, second, third, fourth, fifth and sixth beams reflected from said tissue, respectively, and A and B are correction values.
Claim 15
Dependent Claim
175 words
A reflection oximeter comprising: beam source means for applying, to a tissue of a living body, first and second beams of a wavelength involving a change in absorbance due to a change in oxygen saturation of hemoglobin in blood of said tissue, third and fourth beams of another wavelength involving no change in absorbance, and fifth and sixth beams of a further wavelength involving a relatively small change in absorbance due to changes in a quantity of hemoglobin and oxygen saturation, beam receiving means for detecting said first, second, third, fourth, fifth and sixth beams reflected from said tissue, setting means for setting intensities of the beams emitted from said beam source means to predetermined levels, evaluation means for evaluating intensities of said first, second, third, fourth, fifth and sixth beams reflected from said tissue based on an output of said beam receiving means and evaluating the quantity of hemoglobin and the oxygen saturation of said tissue based on a predetermined function, and output means for outputting results of the evaluation by said evaluation means.
Claim 16
Dependent Claim
175 words
A reflection oximeter comprising: beam source means for applying, to a tissue of a living body, first and second beams of a wavelength involving a change in absorbance due to a change in oxygen saturation of hemoglobin in blood of said tissue, third and fourth beams of another wavelength involving no change in absorbance, and fifth and sixth beams of a further wavelength involving a relatively small change in absorbance due to changes in a quantity of hemoglobin and oxygen saturation, beam receiving means for detecting said first, second, third, fourth, fifth and sixth beams reflected from said tissue, setting means for setting intensities of the beams emitted from said beam source means to predetermined levels, evaluation means for evaluating intensities of said first, second, third, fourth, fifth and sixth beams reflected from said tissue based on an output of said beam receiving means and evaluating the quantity of hemoglobin and the oxygen saturation of said tissue based on a predetermined function, and output means for outputting results of the evaluation by said evaluation means.
Claim 17
Dependent Claim
84 words
A reflection type oximeter in accordance with claim 13, wherein assuming that the intensities of the first, second, third, fourth, fifth and sixth beams reflected from said tissue are represented as P1, P2, P3, P4, P5 and P6, respectively, said evaluation means evaluates the quantity of hemoglobin of said tissue by the expression: C1[log(P3/P4)]² + C2log(P3/P4) + C3 where C1, C2 and C3 are correction values, and evaluates the oxygen saturation of said tissue by the expression: where A and B are correction values.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.