The method of the invention includes accessing a juncture of an esophagus and a stomach of the patient on a distal side of a diaphragm. A hasp is mounted on the interior of the enclosure and a mounting bracket having a flange and a lock hole is disposed on the exterior of the enclosure. A memory interface unit demultiplexes the multiplexed optical signals into the original optical signals and converts the demultiplexed optical signals into electrical signals. A portion of the thin-film member corresponding to the opening or the recessed portion has the glue on only a periphery area of the portion that contacts the support member. The ice detecting lever drive mechanism may include a turning output member which transmits a rotational drive force of the drive source to an outer side of the case body, and a turning-linear conversion mechanism which is arranged on the outer side of the case body to convert turning of the turning output member into reciprocated linear-motion that is transmitted to the ice detecting lever. Whether the output of the multiplexer is the decision bit of the adaptive level Viterbi decoder or the hard decoder is determined by the mode selection algorithm.