All non-invasive devices intended for modifying the biological or chemical composition of human tissues or cells, blood, other body liquids or other liquids intended for implantation or administration into the body are classified as class IIb, unless the treatment for which the device is used consists of filtration, centrifugation or exchanges of gas, heat, in which case they are classified as class IIa.
Tá na feistí neamhionracha ar fad a beartaíodh chun an comhdhéanamh bitheolaíoch nó ceimiceach a mhodhnú i ndáil le fíocháin dhaonna nó cealla daonna, fuil dhaonna, leachtanna coirp eile nó leachtanna eile a beartaíodh le hionchlannú nó le tabhairt isteach sa cholainn aicmithe mar aicme IIb, ach amháin má tá scagachán, lártheifneoiriú nó malartuithe gáis, teasa i gceist sa chóireáil, agus sa chás sin, aicmítear iad mar aicme IIa