There is provided a pressure damping device for a brake system. In this way, a plurality of linear porous layers are formed on the associated linear mixture layers formed on the surface of the electrode hoop. For example, the engaging member may be bent into a first shape that disposes first and second portions of the sensor holder into an opposing relationship the for receiving a patient appendage therebetween. A first control unit is connected to the first input and coupled to the adjustable current source, and is designed to compare the input voltage to a threshold and, if the comparison indicates the input voltage being smaller than the threshold value, adjust the adjustable current source such that the input voltage is equal or greater than the threshold value.