BLOOD PUMP SYSTEMS AND METHODS Russian patent published in 2021 - IPC A61M60/00 

FIELD: medical equipment.

SUBSTANCE: system of centrifugal blood pump is made with the possibility to pump blood into the peripheral vein at a rate of 50 to 1500 ml/min for at least 7 days. The average value of the shear stress of the peripheral vein wall is from 2.5 to 10 Pa, and the value of the pulse pressure in the peripheral vein is less than this value in the giving arterial vessel. The system contains a centrifugal blood pump containing an inlet and outlet, containing an incoming flow diffuser for receiving blood and directing it to an impeller. The impeller contains a rotary shaft made with the possibility of engaging with the upper rotary carrier and the lower rotary carrier. The blades on the upper surface of the impeller pass radially from the center of the impeller, and they are made with the possibility of directing blood through the pump case to the outlet. A magnet is mechanically engaged with the impeller. The electric engine is made with the possibility of magnetic coupling with the magnet. An electric engine is capable of rotating at least one magnet and the impeller. The first end of the incoming flow tube is connected via a fluid to the inlet, and the second end is made with the possibility to be inserted into the vein lumen. The incoming flow tube contains a side port for controlled access to the fluid path. The outgoing flow tube has an internal diameter of 4-6 mm. Its first end is connected via a fluid to the outlet, and the second end is made with the possibility of creating a surgical anastomosis to the peripheral vein. The outgoing flow tube additionally contains a side port for controlled access to the fluid path. The control device controls the speed of the impeller. It contains a viscometer, a flow rate sensor and a radius measurement device, and it is made with the possibility to measure blood viscosity; measure the blood flow rate in the blood pump system or blood vessel using the flow rate sensor; measure the radius of the blood vessel using the radius measurement device; determine the value of the shear stress of the wall based on the estimated blood viscosity, measured blood flow rate and the radius of the blood vessel by means of the control device; comparing the determined value of the shear stress of the wall with a given reference value by means of the control device; regulating the speed of the blood pump, regulating the shear stress to the given reference value by means of the viscometer, the flow rate sensor, the radius measurement device and the control device.

EFFECT: ensuring an increase in the diameter of peripheral vessels.

33 cl, 43 dwg