Blood pump

A pump housing housing for a blood pump comprising:

• a bottleneck-shaped flow inlet region, including a blade assembly mounted for rotation on a rotatable shaft, enclosing a main flow channel together with the pump housing, including a total number of n blades oriented radially to the rotary shaft, each blade being flat and disposed equidistantly around the rotary shaft, and a hollow-cylindrical portion adjoining the bottleneck-shaped flow inlet region downstream thereof in which a rotary motor is located within an inner housing, the rotary motor being rotatably connected by a magnetic coupling to the blade assembly to rotate the blade assembly, and the inner housing in conjunction with the pump housing enclosing a flow channel, which continues the main flow channel, and together with the blade assembly encloses a secondary channel, fluidically communicating with the main flow channel, the secondary channel being fluidically connected to at least one flushing channel passing through the blade assembly and opening into the bottleneck-shaped flow inlet region, the inner housing including a lower bearing facing the blade assembly for rotatably receiving a lower end of the rotary shaft, the upper end of the rotary shaft being mounted in a bearing sleeve located in the bottleneck-shaped flow inlet region which is indirectly secured to the pump housing;
• and
• three flushing channels with each flushing channel including a longitudinal axis oriented parallel to the rotary shaft and the three flushing channels being distributed evenly around the rotary shaft and each flushing channel including a kidney-shaped cross-section in each section surrounding the rotary shaft.