Onyx™ Liquid embolic system

Designed for presurgical embolization of brain arteriovenous malformations (bAVMs), Onyx™ liquid embolic system (LES) is a pre-mixed, radiopaque, injectable embolic fluid consisting of the following components: EVOH (ethylene vinyl-alcohol copolymer), DMSO (dimethyl-sulfoxide) and Ta (micronized tantalum powder). 

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Onyx fluid vessel

The advantage of time,
The power of control1-3

During presurgical embolization of bAVMs, with the Onyx™ LES, the DMSO solvent dissipates into the blood and interstitial fluids, causing the EVOH copolymer and suspended tantalum to precipitate in situ into a spongy, coherent substance. The Onyx™ liquid embolic system begins to form a skin and solidifies over time from the outside to the inside.

Product details


Suspended micronized tantalum powder provides contrast visualization under fluoroscopy


Onyx™ cast reduces blood loss during neurosurgical removal of AVM



Its cohesive deposition and deliveryprovide a slow controlled Onyx™ injection, with the ability to stop when needed

Onyx™ LES is available in several formulations with varying flow properties

The numerical term of Onyx™ LES describes its relative viscosity. Onyx™ LES is offered in 18 and 34 to provide options for controllable injections3.

Onyx LES compatible microcatheters

The Apollo™ Onyx™ delivery microcatheter was expressly designed to access the neuro vasculature for the controlled selective infusion of the Onyx™ liquid embolic system (LES).4

The Marathon™ Flow Directed microcatheter is intended to access the peripheral and neuro vasculature for the controlled selective infusion of physician-specified therapeutic agents such as embolization materials and of diagnostic materials such as contrast media.5

Catheter crossection

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Onyx Liquid Embolic System Surgery Photo

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Onyx Liquid Embolic System is intended for presurgical embolization of brain arteriovenous malformations (bAVMs).


TR02-092, §5.10 & 6.4


TR98-076, §2, 6.2, 6.3, 6.6, & 7


TR02-092, §5.14, 5.15, 5.19.2, 6.8, 6.9


70556-001 03/14


70876-001 03/14