Interventional blood pump

The utility model relates to an intrusive blood pump which comprises a pump body with a blood inlet and a blood outlet and a driving unit. The pump body further comprises a rotatable rigid impeller contained in a rigid impeller outer cylinder, the near end of the impeller is connected to the far end of the driving unit through a flexible shaft, the far end of the impeller outer cylinder is communicated with the blood inlet, and the near end of the impeller outer cylinder comprises an impeller outlet. And a radially expandable catheter disposed outside the flexible shaft and extending over at least a portion of its length, the distal end thereof being sealingly connected to the impeller outer barrel and covering the impeller outlet, the proximal end opening a blood outlet, the blood outlet opening being in a radially expandable state. And a blood flow channel communicated with the blood inlet and the blood outlet is formed by a gap between the flexible shaft and the flexible shaft. According to the blood pump,