A catheter pump intended to be inserted into the circulatory system of a mammal, for example, to help the heart, comprising: a hollow catheter (2)； a drive cable (5) arranged in a lumen (6) of said hollow catheter (2)； a drive shaft (5) connected to a distal end of the drive cable (1) to be rotated by the drive cable； a proximal housing (9) and a distal housing (10) arranged at the proximal and distal ends of the drive shaft (5)； several filaments (11) extending between the proximal carcass (9) and the distal carcass (10)； and a propeller (4) which is arranged in the drive shaft between the proximal housing (9) and the distal housing (10)； a distal bearing (24) and a proximal bearing (25) to support the drive shaft (5) disposed in the distal housing (10) and the proximal housing (9)； and a purge system for passing fluid along the hollow catheter (2) to said proximal bearing (25) for lapurga and lubrication of said proximal bearing； characterized by channel means (22) that are provided in the rotating shaft (5) for passing fluid from said bearing proximal to said distal bearing (24) and for purging and lubricating said distal bearing, in which the said drive shaft (5) is surrounded by a sleeve (8) and said channel means are arranged between said drive shaft and said sleeve, in the nature of grooves in the tree and / or in the sleeve.Una bomba de catéter destinada a ser insertada en el sistema circulatorio de un mamífero, por ejemplo, paraayudar al corazón, que comprende: un catéter hueco (2)； un cable de accionamiento (5) dispuesto en un lumen (6) del citado catéter hueco (2)； un árbol de accionamiento (5) conectado a un extremo distal del cable de accionamiento (1) para ser rotado porel cable de accionamiento； una carcasa proximal (9) y una carcasa distal (10) dispuestas en los extremos proximal y distal del árbol de accionamiento(5)； varios filamentos (11) que se extienden entre la carcasa proximal (9) y la carcasa distal (10) ； y un propulsor (4) que está dispuest
