Abstract: A device for affecting the hydrodynamic system of the internal ear, said system including the perilymph and the endolymph. A first apparatus generates a desired static-pressure level. A second apparatus varies the static-pressure level. A third connector between the first and second devices affects the static pressure level upon predetermined pressure changes in accordance with a predetermined program controlled by a control unit. The first device includes a medium pump for generating the desired static-pressure level in a medium reservoir. The second device includes a unit for causing movements of a membrane which is connected to the reservoir. These movements are arranged to cause variations of the static-pressure level. The membrane has a predetermined area, and the unit is arranged to affect the membrane by a force of a certain magnitude to generate the pressure changes.

Abstract: Ventilation tube without protruding flanges, intended for ventilation and drainage of the middle ear by temporary implantation into the tympanic membrane, said tube having a micro-pitted titanium exterior surface with at least a number of micro-pits with a diameter of about 2-20 micrometer and a depth of 5-80 micrometer, as well as method and use of such ventilation tube.

Abstract: In a method and apparatus for the generation and transmission of complex pressure surges to the fluid system of the inner ear, this fluid system comprising an outer fluid chamber (perilymphatic space) provided with inlet and outlet, which entirely surrounds an inner fluid chamber (endolymphatic space), the fluid volume therein regulating the hearing ability of the ear in order, through intermittent compression of said inner chamber, to reduce any impairment of the hearing which may exist due to expansion of said chamber caused by too large a volume of fluid in said inner chamber, reproducible pressure pulses or surges are produced, consisting ofa first pressure component (a) having varying pressure oscillations, anda second component (b) superimposed on said first component (a) and having a predeterminable overpressure,said first component (a), by means of rapidly repeated pressure variations, substantially blocking the passage of fluid from the outer fluid chamber, in addition to which the said component (b)