Samsung Electronics has received US Patent No. 7,670,772, "Microfluidic chip for multiple bioassay and method of manufacturing the same." Microfluidic channels are first formed by coupling a channel structure that includes grooves for sample channels and probe channels in a bottom surface and a substrate. Probe immobilization regions are then formed at intersections between the probe channels and the sample channels. Finally, blocking walls are formed in the probe channels before and after each of the probe immobilization regions to prevent mixing of target sample.