Optical sensor and method for measuring concentration of a chemical constituent using its intrinsic optical absorbance
First Claim
1. A system for measuring an analyte in a biological fluid using an intrinsic optical absorbance of the analyte, the system comprising:
- a fluid sample containing an analyte;
a light source forming an optical beam that is directed on a route through the fluid sample;
a reactor that selectively removes the optical absorbance of the analyte wherein the analyte has a first optical absorbance before the removal and further having a second optical absorbance after the removal; and
a light detector receiving the optical beam directed through the fluid sample to produce a first signal indicative of the first optical absorbance and receiving the optical beam directed through the fluid sample after the removal to produce a second signal indicative of the second optical absorbance.
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Abstract
An improved optical sensor and method for measuring concentration of a chemical constituent where measurement interference from other chemical compounds is present in the solution is provided. More specifically, the invention relates to a system for measuring the amount of creatinine in effluent dialysate during, before, or following a kidney dialysis procedure and a method for using the same. Alternatively, the method may be used with blood and other body fluids or solutions that contact the patient. The system may use an enzyme or other chemical process to specifically remove or convert an analyte with an intrinsic optical absorbance. By measuring the absorbance before and after the chemical process the analyte can be measured with high accuracy and specificity. The method may be extended to multiple analyte measurements using cascaded chemical processes.
40 Citations
21 Claims
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1. A system for measuring an analyte in a biological fluid using an intrinsic optical absorbance of the analyte, the system comprising:
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a fluid sample containing an analyte; a light source forming an optical beam that is directed on a route through the fluid sample; a reactor that selectively removes the optical absorbance of the analyte wherein the analyte has a first optical absorbance before the removal and further having a second optical absorbance after the removal; and a light detector receiving the optical beam directed through the fluid sample to produce a first signal indicative of the first optical absorbance and receiving the optical beam directed through the fluid sample after the removal to produce a second signal indicative of the second optical absorbance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 21)
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11. A method for measuring creatinine, the method comprising the steps of:
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pumping a substance through an optical beam; detecting a first optical absorbance of the substance; combining the substance with creatinine deiminase; detecting a second optical absorbance of the substance combined with creatinine deiminase; and comparing the first optical absorbance to the second optical absorbance. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification