Blood Mixers for Transfusion Therapy: Blood Flow Estimation Based on PPG Technique

The photoplethysmography technique take advantage of the pulsatile phenomena inside the cardiovascular system. In addition, the blood volume can be discriminated from the sourounding tissues because of its optical reflectance property under a certain wavelengh of light source. In medical systems that used blood for donation the setup of apparatus can made the optimum environment to apply the photopletysmography tecnique. Therefore, in the presented paper the estimation of blood flow rate is determined by applying the described technique. This measurement can increase the redundance of electronical part that monitor the blood flow during the transfusion operation. The actual method that calculate the previous parameter is based on the mass sensor however, in the event of the inoperability of the force sensor, the mass of the blood packet may be greater or less than a predetermined volume. The article discusses possible options for the passage of blood flow through the tube, as well as modeling the real process of donation. It is part of the work devoted to the modernization and development of new equipment for transfusion therapy based on LLC Lidkor production.