Pumps

The present application relates to pumps including: a first fluid port and a second fluid port, a housing having an interior surface defining a cavity, a rotor, being rotatably mounted within the housing, and comprising, a housing engaging surface area, and a surface recess that, a resiliently deformable diaphragm providing part of the interior surface of the housing, the rotor comprising an elongate body and a drive shaft, which body is substantially hollow and comprises separate first and second rotor cavities, the pump being arranged such that when the rotor body is located within the housing cavity, the first fluid port is in fluid flow communication with the first rotor cavity via the opening at the first end of the rotor, and the pump being arranged such that the resiliently deformable diaphragm always bisects the first opening and the second opening on the rotor surface recess as the rotor rotates.