Impeller and ventricular assist device

Abstract

The invention provides an impeller and a ventricular assist device. The impeller comprises at least one cover plate and a plurality of blades, the cover plate is provided with a first assembling face and a second assembling face which are back to back, the blades are arranged on the first assembling face, the second assembling face comprises a bearing face and an inclined face, and the bearing face and the inclined face are connected; the inclined face is provided with a first side edge and a second side edge which are opposite to each other in the radial direction of the impeller, the first side edge is connected with the bearing face, the inclined face obliquely extends towards the side close to the blades in the direction from the first side edge to the second side edge, and the included angle between the inclined face and the bearing face is not larger than 5 degrees; and on the cross section passing through the central axis of the impeller, the ratio of the length of the bearing face to the length of the second assembling face is 1/5-3/5. According to the impeller and the ventricular assist device, the axial force borne by the whole impeller is reduced by controlling the pressure borne by the upper surface and the lower surface of the impeller, and suspension control over the impeller is easier.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to an impeller and a ventricular assist device. Background technique [0002] As an effective means of treating heart failure patients, a ventricular assist device is an artificial mechanical device that pumps blood directly from the venous system or the heart into the arterial system, partially or completely replacing the work of the ventricle. [0003] Ventricular assist devices mostly use impeller rotation to pressurize, and the impellers are balanced by hydraulic thrust or magnetic force, thereby suspending in the inner cavity of the ventricular assist device. When the impeller is not rotating, the impeller is close to the inner wall of the ventricular assist device. When the impeller starts to rotate, the sliding of the impeller relative to the inner wall will generate frictional resistance. Excessive frictional resistance will hinder the suspension of the impeller, which is not ...

AI Technical Summary

Problems solved by technology

When the impeller is not rotating, the impeller is close to the inner wall of the ventricular assist device. When the impeller starts to rotate, the impeller slides against the inner wall to generate frictional resistance. Excessive frictional resistance will hinder the suspension of the impeller, which is not conducive to the suspension control of the impeller.

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