Artificial oxygen carriers and their use

The invention relates to dispersions of artificial oxygen carriers, wherein the dispersions contain capsules with reversible oxygen storage capacity, wherein the capsules comprise an oxygen-permeable capsule material fluorinated, particularly perfluorinated hydrocarbons, preferably contains perfluorocarbons, and / or includes. The dispersions are particularly suitable as a blood substitute, preferably for purposes of transfusion, for example, states after loss of blood of the human or animal body, especially after operations, accidents, injuries, etc., or for the prophylactic and / or therapeutic treatment of ischemic states or conditions after reperfusion.