A lipid or other hydrophobic or amphiphilic compound is integrated into a polymeric matrix for drug delivery to alter drug release kinetics. A flexible printed circuit board is attached to the second substrate part by a conductive tape, and electrostatic discharge and damage caused by external mechanical interference can be prevented. The main conduit is divided into a first portion, the cross section of the first portion being smaller than the cross section of the second portion, the fuse holder further including a lateral branch conduit for receiving a wick retainer for a part of its length.