Photopolymers for Otoplastics and Hearing Devices: Shell and Earmould Mechanics, Skin-Contact State, Biofilm, Acoustics and Fit

Vat photopolymerisation can manufacture patient-specific hearing-device geometries and can also serve as a platform for local drug incorporation. Neither geometric success nor one favourable biological test qualifies a finished hearing device. ER-192 separates print state, mechanical function, skin-contact state, acoustic fit, antimicrobial performance and drug-release evidence so that each claim is supported by a test performed on the relevant material and process state.