A paper by scientists at the Hangzhou Dianzi University proposed a 3D-stacked multi-stage inertial microfluidic sort chip to enrich and separate Circulating Tumor Cells (CTCs). The new paper, published in the journal Cyborg and Bionic Systems, provided a multi-stage integration of the spiral and serpentine channels that can meet the requirements of flow rate input for high-throughput and flow rate output for downstream detection.