The invention relates to a medical appliance, and particularly relates to an accessory axial-flow type
blood pump for a heart which can be implanted into a
human body and can be used for assisting the prostrated heart of a patient and supporting the heat of
blood circulation. The accessory axial-flow type
blood pump is composed of a pump
system and a
motor system, and is characterized in that the centers of the two ends of an
impeller hub of the pump
system are respectively embedded with a
ball joint shaft and a ball-and-socket bearing, the hubs of the front and rear guide vanes are respectively embedded with a ball-and-socket bearing, a
ball joint shaft for supporting a rotating
impeller. When the impellers rotate, the impellers can be aligned freely in a radial direction, therefore, the mechanical friction and friction
heating effect of 'shaft-bearing' can be greatly alleviated, the
mechanical vibration of the impellers can be reduced, the service life and stability of the
blood pump can be improved, and
hemolysis,
thrombus and other complications can be reduced; the blades of the impellers are in a varying
pitch spiral shape, and the hubs are in an olive shape, therefore the streamline performance of the impellers is better; furthermore, rear guide vane varying
pitch jaw type blades can effectively change blood pushed by the
impeller from a
rotational flow into a direct flow, therefore the working efficiency of the blood pump can be greatly improved.