An apparatus for performing a nerve block procedure, the apparatus being composed of an echogenic needle or an echogenic soft tissue tunneling device and an echogenic catheter configured for controlled delivery of a medication. In some examples, integrated tunable detectors, using one or multiple Fabry-Perot tunable filters, are provided. A light emitting area of the EL element is provided at an inner side of a principal surface of the light detecting element. Alternatively, the malfunction may be detected from a difference between the engine side coolant temperature and a radiator side coolant temperature. The method further includes generating a diagnostic test parameter configuration file having a data structure associated with the first diagnostic test by accessing the diagnostic test data table.