Engineers have long envisioned that a handheld portable blood diagnosis device would be able to give an accurate measurement of chemical content based on a very small sample in the shortest time possible. One of the immediate applications of such device is the Point Of Care (POC) diagnosis system, whereby a single drop of human blood would determine his health status. However, a major technical challenge lies in the ability to separate different particles, which in the case of human blood, is to separate red and white blood cells and plasma in a quick, cheap, reliable device with low power consumption (less than 100mW). In this paper, we present some preliminary results from our tests of ultrasound standing waves as a potential separation mechanism for blood cells. Micro Particle Image Velocimetry (PIV) technique is the studies.

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