Surgical cartridge, pump and surgical operating machine

A pump comprising plungers and valves for cooperation with membranes to provide for a membrane pump, wherein the plungers comprise a main plunger and an auxiliary plunger for cooperation with

• a main membrane and an auxiliary membrane respectively, wherein the pump is configured to cooperate with a surgical cartridge, comprising
• an inner plate;
• and
• an outer plate arranged approximately parallel to the inner plate,
• wherein between the inner plate and the outer plate flow paths are arranged forming an irrigation flow path for directing fluid towards the surgical site via an irrigation connection and an aspiration flow path for directing fluid away from the surgical site via an aspiration connection,
• wherein the inner plate comprises membranes adapted for cooperation with the plungers and the valves of the membrane pump, and
• wherein the membranes comprise a main membrane, at least a first valve and a second valve and an auxiliary membrane adapted to cooperate with a main membrane plunger, valves and an auxiliary membrane plunger of the pump respectively,
• wherein the main membrane and the auxiliary membrane are arranged in series along the aspiration flow path, and wherein the auxiliary membrane is arranged between the aspiration connection and the main membrane for compensating movement of the main membrane to provide for an approximately even fluid flow from the surgical site,
• wherein the first valve is located between the main membrane and the auxiliary membrane, and wherein the second valve is located downstream from the main membrane in the aspiration flow path.