Abstract: A probe, in particular for ultrasound, having a cooling chamber which is fluidtight and at least partially filled with a dielectric heat-transfer fluid. An interface unit associated with an emitting and/or receiving element of the probe is located at least partially inside or in contact with the cooling chamber. The probe includes a dry chamber separated from the cooling chamber by a fluidtight wall, and a porous heat sink arranged at least partially inside the cooling chamber.