A method of controlling an electronic circuit is provided. A catheter in accordance with an illustrative embodiment of the present invention can include an elongated tubular shaft equipped with a distal tip section having a pre-shaped tip configuration that can be used to facilitate tracking of the device through particular locations of the vasculature. If the destination of the data file is the storage, the gateway device selects a set of analysis algorithms to determine whether the data file comprises sensitive data. Typically, the spectrometer is arranged to reduce the residence time in response to a decrease in the amplitude, of an ion peak detected at the far end of the drift region. The file is ultimately transferred to another of the at least two portable media devices if the synchronization manager determines that the file should be transferred. Also, two rear rollers are mounted in the rear mounting assembly and a front roller is mounted in the front mounting assembly and defines a roller width.