Ventricular assist device

Abstract

The application relates to a ventricular assist device. The ventricular assist device comprises a pressurization inner cavity, an impeller, a positioning magnetic ring group and a servo motor; the pressurization inner cavity includes a first side wall and a second side wall which are opposite; the servo motor includes stators and rotors which are separately arranged at two sides of the first sidewall; the positioning magnetic ring group includes positioning magnetic rings and rotating magnetic rings; the stators and the positioning magnetic rings are fixed to the outer side of the pressurization inner cavity; the rotors and the rotating magnetic rings are fixedly connected with the impeller; a distance sensor is arranged between each stator and the first side wall; each distance sensor senses the distance of the corresponding rotor relative to the first side wall; and the servo motor controls magnetic forces between the stators and the rotors according to a distance value so as to make the impeller suspended under the combined action of the positioning magnetic ring group and the servo motor and rotate in the pressurization inner cavity. According to the ventricular assist deviceof the application, with the cooperation of the servo motor and the distance sensors, the precise control of the servo motor over the impeller can be realized, and thereby, a suspended rotation posture of the impeller in the pressurization inner cavity is guaranteed to obtain a better blood pressurization effect.

Description

technical field [0001] The present application relates to the field of medical devices, in particular to a ventricular assist device with a suspended and rotating impeller. Background technique [0002] Ventricular assist device (commonly known as "blood pump") is an effective means of treating heart failure patients. It is an artificial mechanical device that pumps blood directly from the venous system or the heart into the arterial system, and partially or completely replaces the work of the ventricle. Ventricular assist devices mostly use the impeller to rotate and pressurize. According to the different support methods of the impeller, it can be divided into contact support and non-contact support. Contact support mainly refers to the support method of mechanical bearings, which is more destructive to blood, and is prone to hemolysis and thrombus, which in turn brings a series of complications. Non-contact support includes hydraulic levitation and magnetic levitation. Co...

AI Technical Summary

Problems solved by technology

However, the motor controller is usually installed outside the body, and there will be a time difference in the process of communication between the controller and the sensor and the motor, which makes the controller cause deviation in the motion control of the impeller through the motor, which is not conducive to the normal operation of the rotor.

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