Patent ID: 8157539
Filing Date: 2012-04-17
Classification: A61M,F04D

Abstract:
1. An artificial heart pump comprising: a housing having an inlet and an outlet for a blood flow; a fixed shaft that is fixed to a center position inside the housing in a direction from the inlet to the outlet; a first fixed body, which is fixed inside the housing with a plurality of stationary vanes at an inlet side of the housing and connected to a front-end of the fixed shaft; a second fixed body, which is fixed inside the housing with a plurality of diffuser vanes at an outlet side of the housing and connected to a rear-end of the fixed shaft; a rotating body that is engaged to the fixed shaft and rotatably supported by a circumferential surface of the fixed shaft; a plurality of impeller vanes that stick out from an outside wall surface of the rotating body; motor stators, which are placed in the housing, located at positions encircling the rotating body, and generate a rotating magnetic field therein; a first and a second permanent magnet, which are housed inside the rotating body and the first fixed body, respectively, generating a repulsing magnetic force working in an opposite direction to thrust loads that are applied from a rear side toward a front side in an axial direction of the impeller vanes when the rotating body rotates; and a plurality of protruding portions, which encircles the fixed shaft on either a front-end surface of the second fixed body facing to a rear-end surface of the rotating body or the rear-end surface of the rotating body facing to the front-end surface of the second fixed body; wherein, the first and the second fixed bodies are provided with structures that enable separation from the fixed shaft; only one at a time of the first and the second fixed bodies can be separated from the other fixed bodies using the structures that enable separation; and the blood flow is in an axial direction of the fixed shaft, by having the rotating body rotate by the rotating magnetic field of the motor stators during operation.