Abstract: The device comprises a bag associated to which are actuator means which can be selectively activated so as to enable expansion of the bag, with consequent filling of the bag itself by a mass of blood which flows towards the bag, and to produce contraction of the bag with consequent expulsion from the bag itself of the mass of blood that has flowed into the bag. Associated to the bag is a containment casing to which a duct is connected for enabling inflow and outflow of aeriform with respect to the casing as a result of the movement of expansion and contraction of the bag. A pressure limiter is provided for determining selectively and maintaining in a precise way the value of pressure of said aeriform which determines outflow—and possibly inflow—of the aeriform with respect to the aforesaid casing.