A device that is implantable in the temporal bone for dispensing at least one component of a liquid product, comprising a catheter and means for moving the component along the catheter, wherein the product incorporates particles for transporting the component, the particles being movable under the effect of a magnetic field, wherein the catheter comprises portions for discharging the component from the catheter, the discharging portions being distributed along the catheter, and wherein the moving means comprise means for generating a magnetic field near each discharging portion so as to move the product from discharging portion to discharging portion, the field-generating means comprising windings that surround the discharging portions and that are connected to a control module designed to successively power at least some of the windings.A hearing aid, such as a cochlear implant, comprising an internal unit having an electrode holder provided with such a device.
