System and method for extracting variable-volume blood cells after separation

The invention discloses an extracting system and a separating and extracting method for volume-variable blood cells after separation, and belongs to the technical field of medical instruments. The system comprises a driving assembly and a centrifugal assembly. The centrifugal assembly is mainly composed of a rotating disc, a supporting disc, a volume-variable bag and a centrifugal rotating disc. The supporting disc is located on the top of the rotating disc, and a spring is arranged between the supporting disc and the rotating disc. The centrifugal rotating disc is located on the top of the supporting disc and fixed to the inner wall after being placed through the centrifugal well groove. The variable-volume bag is positioned in an interlayer between the supporting disc and the centrifugal rotating disc; the output end of the driving assembly is connected to the bottom of the rotating disc. In the separation process, pressure is returned to the initial position before liquid feeding, so that the volume change