Apparatus for precise determination of operating characteristics of optical devices contained in a monitoring probe
First Claim
1. A method of compensating for variations in operating characteristics of a probe in the determination of analyte concentration, which probe contains a plurality of light emitting devices, each light emitting device having a characteristic curve indicative of the intensity of the various wavelengths of light produced by the device, and at least one light detector device, each light detector device having a characteristic curve indicative of the sensitivity of the light detector device to various wavelengths of light, said probe being operative to measure, via optical extinction at a monitoring site on a subject, a concentration of analytes contained in said subject to which said probe is connected, comprising the steps of:
- storing in a memory, calibration dam sets which define an interrelationship between a measured ratio of optical extinctions of a selected analyte at two selected wavelengths of light and a value for concentration of said selected analyte in said subject;
identifying a determined composite probe characteristic indicative of optical performance of said probe at a plurality of wavelengths, said composite probe characteristic being computed from a plurality of factors selected from the group consisting of;
light emitting device nominal wavelength, light emitting device characteristic curve bandwidth, light emitting device characteristic curve waveshape, light emitting device characteristic curve centroid, light detector characteristic curve waveshape, light detector characteristic curve centroid, light detector device characteristic curve bandwidth; and
computing, in response to a measured intensity of light at said monitoring site, a concentration of said selected analyte in said subject using said composite probe characteristic and corresponding calibration data set.
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Accused Products
Abstract
The apparatus of the present invention characterizes the operating characteristics of a medical monitoring probe in a more comprehensive and accurate manner than is heretofore known in the prior art. This apparatus not only identifies the present value of a plurality of operating characteristics of the optical components contained in the probe, but also computes the interrelationship therebetween to produce a composite probe indicia that substantially defines the net operating characteristics of the probe, including the interrelation of the various interactive and/or cumulative effects. This composite probe indicia represents either a number or a graphical representation of probe operating characteristics that can be used directly by the processor contained within the monitoring system to perform the required computations.
164 Citations
18 Claims
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1. A method of compensating for variations in operating characteristics of a probe in the determination of analyte concentration, which probe contains a plurality of light emitting devices, each light emitting device having a characteristic curve indicative of the intensity of the various wavelengths of light produced by the device, and at least one light detector device, each light detector device having a characteristic curve indicative of the sensitivity of the light detector device to various wavelengths of light, said probe being operative to measure, via optical extinction at a monitoring site on a subject, a concentration of analytes contained in said subject to which said probe is connected, comprising the steps of:
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storing in a memory, calibration dam sets which define an interrelationship between a measured ratio of optical extinctions of a selected analyte at two selected wavelengths of light and a value for concentration of said selected analyte in said subject; identifying a determined composite probe characteristic indicative of optical performance of said probe at a plurality of wavelengths, said composite probe characteristic being computed from a plurality of factors selected from the group consisting of;
light emitting device nominal wavelength, light emitting device characteristic curve bandwidth, light emitting device characteristic curve waveshape, light emitting device characteristic curve centroid, light detector characteristic curve waveshape, light detector characteristic curve centroid, light detector device characteristic curve bandwidth; andcomputing, in response to a measured intensity of light at said monitoring site, a concentration of said selected analyte in said subject using said composite probe characteristic and corresponding calibration data set. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. Apparatus for compensating for variations in operating characteristics of a probe in the determination of analyte concentration, which probe contains a plurality of light emitting devices, each light emitting device having a characteristic curve indicative of the intensity of the various wavelengths of light produced by the device, and at least one light detector device, each light detector device having a characteristic curve indicative of the sensitivity of the light detector device to various wavelengths of light, said probe being operative to measure, via optical extinction at a monitoring site on a subject, a concentration of analytes contained in said subject to which said probe is connected, comprising:
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a memory for storing data indicative of at least one calibration data set, which defines an interrelationship between a measured ratio of optical extinctions of a selected analyte at two selected wavelengths of light and a value for concentration of said selected analyte in said subject; means for identifying a determined composite probe characteristic indicative of optical performance of said probe at a plurality of wavelengths, said composite probe characteristic being computed from a plurality of factors selected from the group consisting of;
light emitting device nominal wavelength, light emitting device characteristic curve bandwidth, light emitting device characteristic curve waveshape, light emitting device characteristic curve centroid, light detector characteristic curve waveshape, light detector characteristic curve centroid, light detector device characteristic curve bandwidth; andmeans, responsive to a measured intensity of light at said monitoring site, for computing a concentration of said selected analyte in said subject using said at least one calibration data set and said composite probe characteristic. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification