Magnetic fluid coupling passive suspension type double-suction centrifugal blood pump

Abstract

The invention discloses a magnetic fluid coupling passive suspension type double-suction centrifugal blood pump. The magnetic fluid coupling passive suspension type double-suction centrifugal blood pump is characterized in that a rotor provided with impellers and a threaded groove is embedded into a volute cavity provided with two inlets, the shapes of the inlets become wider from narrow, suspension permanent magnet sheets are mounted at two ends of the rotor, and suspension permanent magnet rings are arranged in a volute. The rotor adopts a conical outer surface, and an equal-pitch thread groove is formed in the outer surface; the impellers are mounted on the rotor and integrally connected; blood flows into the volute cavity through the inlets in the two sides of the volute, a rotating magnetic field is generated after a motor coil is powered on, the suspended permanent magnetic sheets in the rotor are driven to rotate, the impellers are driven to rotate, the blood flows out of an outlet of the volute, and the outer surface of the conical rotor and the threaded groove jointly achieve the effect of draining the blood; and static pressure supporting force is provided for suspensionof the rotor by a blood film in the gap of the impellers and the inner wall of the volute, permanent magnet suspension and hydraulic static pressure support jointly guarantee that the rotor is suspended in the volute, and adverse factors such as abrasion and frictional heating between the rotor and the volute are reduced. The magnetic fluid coupling passive suspension type double-suction centrifugal blood pump is compact in structure, high in efficiency, large in flow and small in axial force, energy consumption of the blood pump is reduced, and development of the blood pump to the fourth-generation non-contact bearing type artificial heart is facilitated.

Description

technical field [0001] The invention relates to a medical device, in particular to a magnetic fluid coupling passive suspension double-suction centrifugal blood pump. Background technique [0002] Artificial blood pumps have gone through three stages of development, namely: [0003] 1. Imitating the function of the natural heart, a valve pump capable of generating pulsating blood flow; [0004] 2. A continuous blood pump capable of generating non-pulsating continuous blood flow, using various forms of rolling or sliding bearings; [0005] 3. Suspension blood pump adopting magnetic levitation, hydraulic levitation or magnetic fluid coupling bearing technology. [0006] The first generation of artificial blood pumps is mainly based on bionic design, which uses mechanical or electromagnetic drive to generate periodic volume changes to simulate the beating of the heart. However, this kind of blood pump has problems such as large volume, complex structure, and short life, and m...

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Problems solved by technology

[0006] The first generation of artificial blood pumps is mainly based on bionic design, which uses mechanical or electromagnetic drive to generate periodic volume changes to simulate the beating of the heart. However, this kind of blood pump has problems such as large volume, complex structure, and short life, and most of them cannot be implanted. The human body is only used as an external aid

The second-generation artificial blood pump uses a high-speed rotating impeller to drive blood flow. This generation of artificial blood pumps generally uses contact bearings to improve performance. Aspect blood compatibility issues due to heat generated by friction

[0009] There are still some technical problems in the magnetic levitation technology: 1. The active control method of the magnetic levitation requires a complete set of additional control system, and the control system is relatively complicated; 2. The active control method of the magnetic levitation technology consumes a lot of energy

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