Medical apparatus and devices, in particular for the treatment of sepsis; medical apparatus and devices for counteracting the effects of viruses, bacteria and pathogens in the blood and blood components by contacting blood with ozone gas; medical devices for the treatment of blood infections and sepsis by using active oxygen; oxygenators for medical use, namely, for treating blood infections and sepsis; ozonisers being ozonators for treating blood infections and sepsis for medical use; dispos...