A self cleaning inlet head for use on a shunt. The head has a tube with openings disposed in predetermined positions in its wall and a cleaning element installed inside the tube. The cleaning element may comprise a central shaft with a number of bristles protruding therefrom preferably in locations substantially identical to the positions of the openings in the wall of the tube. Mutual vibratory motion between the cleaning element and the tube causes at least some of the bristles to enter the openings thereby keeping them clear and preventing tissue growth into them. The vibratory motion may be generated by the action of an external field on a responsive part of the cleaning element such as an external magnetic field operating on a magnetic or magnetized part of the cleaning element or the bristles. Alternatively the external field may be an ultrasound field operating on the bristles.
