All devices used for contraception or prevention of the transmission of sexually transmitted diseases are classified as class IIb, unless they are implantable or long term invasive devices, in which case they are classified as class III.
Tá na feistí ar fad a úsáidtear i gcomhair frithghiniúna nó chun tarchur galar gnéas-tarchurtha a chosc aicmithe mar aicme IIb, ach amháin más feistí so-ionchlannaithe nó feistí ionracha fadtéarmacha iad, agus sa chás sin tá siad aicmithe mar aicme III.