Multi-wavelength oximeter having a means for disregarding a poor signal
First Claim
1. An oximeter for measuring oxygen saturation in arterial blood comprising:
- light source means for projecting light to a body member to be measured;
light responsive means for receiving the light which has transmitted through said body member and for generating at least first, second and third signals at three different wavelengths;
calculating means for calculating at least first oxygen saturation data using first and second signals and second oxygen saturation data using first and third signals;
determining means for determining whether or not a difference between said first and second oxygen saturation data is within a predetermined level; and
means for designating said first and/or second oxygen saturation data as valid when said difference is within said predetermined level, and as invalid when said difference is not within said predetermined level.
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Accused Products
Abstract
An oximeter for measuring oxygen saturation in arterial blood includes a light source for projecting light to a body member to be measured, a light responsive circuit for receiving the light which has transmitted through said body member and for generating at least first, second and third signals at three different wavelengths, and a calculator for calculating at least first SaO2 data using first and second signals and second SaO2 data using first and third signals. It is detected whether or not a difference between the first and second SaO2 data is within a predetermined level. When the difference is within the predetermined level, it is assumed that the first and/or second SaO2 data are valid, but if not, they are assumed as invalid.
451 Citations
12 Claims
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1. An oximeter for measuring oxygen saturation in arterial blood comprising:
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light source means for projecting light to a body member to be measured; light responsive means for receiving the light which has transmitted through said body member and for generating at least first, second and third signals at three different wavelengths; calculating means for calculating at least first oxygen saturation data using first and second signals and second oxygen saturation data using first and third signals; determining means for determining whether or not a difference between said first and second oxygen saturation data is within a predetermined level; and means for designating said first and/or second oxygen saturation data as valid when said difference is within said predetermined level, and as invalid when said difference is not within said predetermined level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An oximeter for measuring oxygen saturation in arterial blood comprising:
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light source means for projecting light to a body member to be measured; light responsive means for receiving the light which has transmitted through said body member and for generating at least first, second and third signals at three different wavelengths; detecting means for detecting whether or not an amplitude level of each of said first, second and third signals is within a predetermined range between upper and lower levels; selecting means for selecting first, second and third signals which have been detected by said detecting means; calculating means for calculating at least first oxygen saturation data using selected first and second signals and second oxygen saturation data using selected first and third signals; determining means for determining whether or not a difference between said first and second oxygen saturation data is within a predetermined level; and means for designating said first and/or second oxygen saturation data as valid when said difference is within said predetermined level, and as invalid when said difference is not within said predetermined level.
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Specification