The present invention relates to a fluid pump system (64) having a fluid reservoir (21) comprising a first cavity (29) and a second cavity (30) in fluidic communication with each other and adapted to accommodate a biological fluid (7). The fluid reservoir (21) is connected to a fluid-container system (27) and a target (5) is in fluidic communication with the second cavity (30). A pressurization system is adapted to generate a first pressure below ambient pressure in the first cavity (29) and generate a second pressure in the first cavity (29). The second pressure is also applied to the second cavity (30). The fluid pump system (64) thereby causes flow of the biological fluid (7) from the fluid-container system (27) into the first cavity (29), from the first cavity (29) into the second cavity (30), and from the second cavity (30) to the target (5).
