A heart pump including: a housing forming a cavity including: at least one inlet aligned with an axis of the cavity； and, at least one outlet provided in a circumferential outer wall of the cavity； an impeller provided within the cavity, the impeller including vanes for urging fluid from the inlet to the outlet； and, a drive for rotating the impeller in the cavity and wherein a flow path through the pump has a minimal cross-sectional area of at least 50mm
