The present invention defines a blood pump comprising a cartridge, the cartridge comprising a first recess therein, said first recess having a surface, and a flexible diaphragm closing said first recess, the first recess and the flexible diaphragm defining a first pump chamber, said first pump chamber having an inlet and an outlet wherein the flexible diaphragm of the first pump chamber is movable between a first position, separated in use from the surface of the first recess, wherein in said first position said first pump chamber has a maximum volume, and a second position, substantially adjacent to the surface of the first recess, wherein in said second position said first pump chamber has a minimum volume, a pump driver arranged to interface with the cartridge, said pump driver operable to move the flexible diaphragm of the first pump chamber in a first direction into said first recess to, in use, pump blood from the chamber and to move the flexible diaphragm of the first pump chamber in a second direction away from the first recess to, in use, draw blood into said first pump chamber, wherein, the cartridge further comprises one or more sensor cavities defined by respective recesses in the cartridge, the, or each, recess being closed by a flexible diaphragm.La présente invention définit une pompe à sang comprenant une cartouche, ladite cartouche comprenant un premier renfoncement en son sein et ledit premier renfoncement étant doté dune surface et dun diaphragme flexible refermant ledit premier renfoncement, le premier renfoncement et le diaphragme flexible définissent une première chambre de pompe, ladite première chambre de pompe étant dotée dune entrée et dune sortie entre lesquelles le diaphragme flexible de la première chambre de pompe peut se déplacer entre une première position, séparée pendant lutilisation de la surface du premier renfoncement, ladite première position ayant dans ladite première chambre de pompe un volume maximal, et une seconde position,
