Patent ID: 9228995
Filing Date: 2016-01-05
CPC Classification: G01N

Claim Text:
1. An apparatus for measuring hematocrit of blood, the apparatus comprising: a body part provided with a first inner side wall opposite a second inner sidewall, a blood inlet and a blood outlet; a first electrode disposed on the first inner side wall, and a second electrode disposed on the second inner side wall, wherein the first electrode and the second electrode are opposite to each other; a third electrode disposed on the first inner side wall and disposed a predetermined distance from the first electrode; a measurement unit configured to measure a first impedance of blood between the first and second electrodes and a second impedance of the blood between the first and third electrodes; and a calculation unit configured to determine hematocrit of blood using the first and second impedances, wherein the calculation unit is configured to calculate a first and a second hematocrit estimation parameter by determining a ratio of the impedance of plasma and a sum of the impedance of plasma and the impedance of cytoplasm, wherein the impedance of plasma and the impedance of cytoplasm of the blood are determined using the first and second impedance measurements, determining a normalized difference between the first and second hematocrit estimation parameters, and determining the hematocrit of the blood using both the first hematocrit estimation parameter and the normalized difference.