An autotransfusion device (10) for collecting blood from a pooi in a patient and for subsequently returning the collected blood to the circulatory system of the patient is disclosed. The device includes a liquid collection chamber (66) having a movable wall (30) and a stationary wall (14). The liquid collection chamber is connected to the pool of blood by an aspirator and to a suction source to draw the blood into the collection chamber. After the collection chamber is filled to the capacity desired, a compressed spring (82) is released to urge the movable wall toward the stationary wall. The blood is forced out of the collection chamber by the compressed spring and back to the circulatory system of the patient.
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