These transducers are categorized as surface devices in contact with the skin for a limited duration (< 24 h) during clinical use according to ISO 10993-1.Appropriate testing, including cytotoxicity, irritation, and sensitization, has been conducted in all patient-contacting materials of the transducers, and the results are considered acceptable for the intended patient contact type and duration (see {MQ}Table 3 7{MQ} for applicable biological evaluation reference for each transducer).