A seat belt buckle for seat belts has a housing, an opening for inserting a seat belt tongue, a locking device for locking the seat belt tongue, and a release device for releasing the seat belt tongue from the lock. One method of the present invention includes representing data using at least one pulse based on a Gaussian wave form, sending the at least one pulse over an electrically conductive guided media, and recovering the data from the at least one pulse. The physiological response useful to treat a number of physiological conditions. There may also be software for generating output data employing at least partly the document object and the output device object, the output data relating to the output content for rendering at the output device, and software for transmitting the output data for rendering of the output content at the output device. The sensors are preferably passive planar waveguide type devices disposed to interact with the environment external to the catheter or other medical device.