Onyx

Onyx is the trade name for a liquid embolic agent used in interventional radiology for the occlusion of blood vessels in embolization therapy. It is an elastic copolymer (ethylene vinyl alcohol copolymer (EVOH)), dissolved in dimethyl-sulfoxide (DMSO). Micronised tantalum powder is also added as an ingredient to provide radiopacity.

It comes in two strengths:

  • Onyx 18: 6% ethylene vinyl alcohol
  • Onyx 34: 8% ethylene vinyl alcohol

History and etymology

It was first described by Taki et al. in 1990 .

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