Patent ID: 7167735
Filing Date: 2007-01-23
Classification: A61B,G01N

Abstract:
1. A concentration measuring instrument, comprising: a main body that has a concentration measuring contact, a light source that emits light and enters the light into the concentration measuring contact, and a photodetector; and judging means that calculates the difference between (1) a non-contact measured value, a value, measured by the photodetector while keeping a subject of measurement out of contact with the concentration measuring contact, of the quantity of light which is emitted and entered by the light source into the concentration measuring contact, passed through or oozed from the concentration measuring contact to the outside thereof and returned to the concentration measuring contact and (2) a reference value, a value, measured by the photodetector while keeping the concentration measuring contact clean, of the quantity of the light which is emitted and entered by the light source into the concentration measuring contact, passed through or oozed from the concentration measuring contact to the outside thereof and returned to the concentration measuring contact, and judges whether a calculation of the concentration of a specific component in the subject of measurement is effective or not by comparing the calculated difference with a threshold.