Low-hemolysis-rate heart pump with blood automatic reverse flushing structure

Abstract

The invention discloses a low-hemolysis-rate heart pump with an automatic blood reverse flushing structure, and belongs to the technical field of heart auxiliary devices, the low-hemolysis-rate heart pump comprises a heart pump shell cavity, a flow channel inlet and a flow channel outlet, and a contraction section flow channel, a straight-through section flow channel and an expansion section flow channel are arranged on the inner wall of the heart pump shell cavity from the flow channel inlet to the flow channel outlet; a driving impeller is arranged in the flow channel, a stator coil, a rotor coil and a plurality of spiral micro-flushing hole channels are arranged in the heart pump shell cavity, and the spiral direction of the micro-flushing hole channels is opposite to the spiral direction of the driving impeller. The spiral micro-flushing hole channel can automatically perform reverse flushing on a flowing channel in the pump, especially an annular gap of an impeller channel, by utilizing the pressure difference in the pump, flowing stagnation of the annular gap in the pump can be effectively avoided, and the probability of hemolysis and thrombus generation is reduced; and the micro-scouring hole channel has the function of counteracting torsional force generated when the impeller rotates, vibration of the pump body can be well reduced, and the overall operation stability of the pump is improved.

Description

technical field [0001] The invention relates to a heart pump with a low hemolysis rate with an automatic reverse flushing structure of blood, and belongs to the technical field of cardiac assist devices. Background technique [0002] At present, a variety of artificial hearts have been used clinically, most of which are centrifugal and axial flow heart pumps. Both of these two vane type heart pumps have some problems, such as: because the driving impeller and the inner wall of the pump casing are not in direct contact, an annular gap is inevitably left between the two, and the size of this gap is strictly required to ensure the stator coil. It can maintain a certain magnetic field coupling with the rotor coil to ensure the suspension and rotation of the rotor. On the one hand, the existence of the annular gap will form a large shear force, damage the red blood cells, and cause hemolysis; on the other hand, it will cause the blood flow to stagnate and increase the generation ...

AI Technical Summary

Problems solved by technology

These two vane heart pumps have some problems, such as: since the driving impeller and the inner wall of the pump casing are not in direct contact, an annular gap is inevitably left between the two, and the size of this gap is strictly required to ensure that the stator coil It can maintain a certain magnetic field coupling with the rotor coil to ensure the suspension and rotation of the rotor. On the one hand, the existence of the annular gap will form a large shear force, damage red blood cells, and cause hemolysis; on the other hand, it will cause blood flow to stagnate and increase thrombus. In addition, the high-speed rotating impeller will generate certain vibrations on the pump body, which will affect the stability of the overall operation of the pump.

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