Axial-flow blood pump with radial permanent magnetic bearing with dislocation design

Abstract

The invention discloses an axial-flow type blood pump with a staggered designed radial permanent magnetic bearing. According to the axial-flow type blood pump, the problem that the levitation gap of an axial blood pump cannot be effectively reduced is solved, the radial permanent magnetic bearing and an impeller are arranged in a staggered mode, and on the basis of no increase of the size of a magnet, the levitation gap is reduced, so that the levitation magnetic force is improved. The technical scheme of the axial-flow type blood pump comprises a pump casing, wherein a front guide vane is arranged at a blood inlet end in the pump casing, a rear guide vane is arranged at a blood outlet end in the pump casing, and the impeller is axially arranged between the front guide vane and the rear guide vane; the permanent magnetic bearing is arranged in the radial direction of the impeller, the permanent magnetic bearing comprises a magnetostatic iron ring and a dynamic magnetic iron ring, and the outer circle of a rotor of the dynamic magnetic iron ring and the root part of the impeller are located on circles with different diameters.

Description

technical field [0001] The invention relates to the technical field of medical instruments, in particular to an axial-flow blood pump with a radial permanent magnetic bearing of dislocation design. Background technique [0002] At present, blood pumps are developing very rapidly as short-term or long-term adjuvant treatment devices for end-stage heart failure. At present, they have developed to the third generation - magnetic (hydraulic) support blood pumps, which have two types: centrifugal and axial flow. Compared with the traditional mechanically supported rotary blood pump, the maglev blood pump relies on magnetic force to suspend the impeller rotor in the pump body, which has the characteristics of no friction, no mechanical contact, no lubrication, low energy consumption, and long life. Axial blood pumps are tubular in shape and smaller in size, making them more suitable for implantation in the human body. Therefore, the axial-flow magnetic levitation blood pump has b...

AI Technical Summary

Problems solved by technology

[0005] In the axial flow blood pump, to ensure the blood flow, a certain impeller height must be guaranteed. Generally, the impeller blades in the axial flow blood pump structure are located between the stator and the rotor of the permanent magnet radial bearing. Therefore, the support clearance of the magnetic suspension bearing is limited by the impeller. The height limit cannot be reduced, and the magnetic force is inversely proportional to the square of the gap, so the levitation magnetic force is small when the gap is large, and the radial bearing stiffness is small. For this reason, some axial flow blood pumps use liquid suspension in the radial direction. will bring some other problems

[0006] To sum up, in the prior art, there is still no effective solution to the problem that the suspension gap of the axial flow blood pump cannot be effectively reduced

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