class IIa if they are intended for short-term use, except if they are used in the oral cavity as far as the pharynx, in an ear canal up to the ear drum or in the nasal cavity, in which case they are classified as class I; and
aicme IIa má beartaíodh iad lena n-úsáid go gearrthéarmach, seachas má úsáidtear iad i gcuas an bhéil chomh fada leis an bhfaraing, i gcanáil chluaise suas go dtí tiompán na cluaise nó i gcuas na sróine, agus sa chás sin tá siad in aicme I; agus