Patent ID: 9164078
Filing Date: 2015-10-20
Classification: A61B,G01N

Abstract:
1. In a blood processing procedure in which blood is processed into one or more blood components with a single-use processing kit, the processing kit including tubing through which the blood is flowed, and a reusable hardware module onto which the processing kit is mounted, the reusable hardware module including a sensing field defined by an infrared light source and an infrared reflectance sensor that receives a segment of the tubing, a method for predicting the hematocrit of the blood comprising: loading the processing kit onto the hardware module with a segment of the tubing positioned in the sensing field defined by the infrared light source and the infrared reflectance sensor; obtaining an infrared reflectance measurement of the segment of the tubing with either no fluid or a non-reflecting fluid within said segment; flowing blood through the segment of the tubing; obtaining an infrared reflectance measurement of the segment of the tubing with said blood; deriving the natural log of the infrared reflectance measurement attributable to the presence of blood in the segment of the tubing; inputting the natural log of the infrared reflectance attributable to the blood in the segment of the tubing into a correlation equation to arrive at the hematocrit of the blood; outputting the predicted hematocrit of the blood.