Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1991-09-30
1993-01-12
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
128633, 356 40, G01N 3316
Patent
active
051792885
ABSTRACT:
An apparatus and method for measuring a bodily constituent such as glucose or cholesterol by analyzing a sample taken from the body such as blood, saliva or urine. The sample is placed on a test strip inserted into the test block portion of the apparatus where the portion of the sample containing the constituent desired to be measured reacts with a chemical reagent. Products of this reaction have an absorbance/reflectance characteristic which is mathematically related to the concentration of the constituent in the bodily sample. The reflected light is absorbed by a photodiode and the output of the photodiode converted to a digital form where a microprocessor can calculate the concentration of the constituent using the mathematical relationship between the reflected light and concentration stored in memory means of the apparatus.
REFERENCES:
patent: 4059405 (1977-11-01), Sodickson et al.
patent: 4407290 (1983-10-01), Wilber
patent: 4863265 (1989-09-01), Flower et al.
patent: 4935346 (1990-09-01), Phillips et al.
patent: 5059394 (1991-10-01), Phillips et al.
Costaris Arthur
Hovorka George
Miffitt Donald
Poto Edward
Allen S.
Nelms David C.
Ortho Pharmaceutical Corporation
Petrow Joel R.
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