The hemafuse set contains a big syringe, which acts as the collection barrel, a nozzle connected to a filter on the syringe pulls the blood in while sieving the clots.
With a push, the blood is redirected through another tube, connected to the same syringe and operated by a stopcock, to the blood bag for transfusion back to the patient.
Image: Dr Gerald Osei-Owusu with the hemafuse medical device - https://dailyguidenetwork.com