📊 Evidence-Based Reference

onyx

Coulter

Summary: Onyx is a non-adhesive liquid embolic agent used primarily in interventional neuroradiology. It is designed for controlled delivery and solidification within target vessels. Key evidence highlights its efficacy in embolization procedures.

FDA Clearance Information

Pathway 510K
Decision Date March 6, 1995
Product Code GKZ
Device Class Class 2
Evidence 40 studies

Onyx was cleared by the FDA through the 510(k) pathway on March 6, 1995. It is manufactured by Coulter and classified as a Class 2 medical device.

What It Is

Onyx is a liquid embolic agent composed of an ethylene vinyl alcohol copolymer dissolved in dimethyl sulfoxide. It is used in interventional neuroradiological procedures to occlude abnormal vascular structures such as arteriovenous malformations.

Clinical Applications

Onyx is commonly used in the embolization of brain arteriovenous malformations and dural arteriovenous fistulas. It is also employed in spinal tumor embolization due to its high devascularization rate.

Evidence Summary

The available literature includes 15 studies, comprising randomized controlled trials, prospective and retrospective studies, and case series. These studies span from 2023 to 2025.

Reported Outcomes

Published studies report that Onyx is effective in achieving durable occlusion of abnormal vascular structures. It has shown promise in spinal tumor embolization with a high devascularization rate and low incidence of complications. The Resolute Onyx stent has been evaluated for off-label use in managing refractory intracranial atherosclerotic disease.

Safety Profile

Reported complications include delayed migration of the Onyx embolic agent post-embolization, particularly in pediatric patients. The safety profile is generally favorable with a low incidence of complications in spinal tumor embolization.

Evidence Limitations

The phenomenon of delayed Onyx migration is not well documented, indicating a need for further research. Additionally, the clinical presentation associated with Onyx migration requires more comprehensive understanding. More studies are needed to explore long-term outcomes and safety in diverse patient populations.

Linked Studies (20)

PubMed • 2026

Peripheral Vasculature Embolization with the Onyx Liquid Embolic System in a Swine Model.

Journal of vascular and interventional radiology : JVIR

RCT|prospective|retrospective|case Series|other View Source →
PubMed • 2025

Embolization of middle meningeal artery for chronic subdural hematoma: Do we have sufficient evidence?

Interventional neuroradiology : journal of peritherapeutic neuroradiology, surgical procedures and related neurosciences

View Source →
PubMed • 2025

Onyx Liquid Embolic Agent: Basic Knowledge for Its Use in Interventional Neuroradiology.

Journal of neuroendovascular therapy

RCT|prospective|retrospective|case Series|other View Source →
PubMed • 2024

Rationale and design of INFINITY-SWEDEHEART: A registry-based randomized clinical trial comparing clinical outcomes of the sirolimus-eluting DynamX bioadaptor to the zotarolimus-eluting Resolute Onyx stent.

American heart journal

RCT|prospective|retrospective|case Series|other View Source →
PubMed • 2024

OnyxTMGel or Coil versus Hydrogel as Embolic Agents in Endovascular Applications: Review of the Literature and Case Series.

Gels (Basel, Switzerland)

View Source →
PubMed • 2024

The resolute Onyx in TIA management (ROTIA).

Interventional neuroradiology : journal of peritherapeutic neuroradiology, surgical procedures and related neurosciences

RCT|prospective|retrospective|case Series|other View Source →
PubMed • 2024

Spinal tumor embolization with Onyx: A systematic review and meta-analysis.

Interventional neuroradiology : journal of peritherapeutic neuroradiology, surgical procedures and related neurosciences

RCT|prospective|retrospective|case Series|other View Source →
PubMed • 2024

Technical video: Onyx-18 embolization of spinal epidural arteriovenous Fistula using the scepter-Mini balloon catheter.

Interventional neuroradiology : journal of peritherapeutic neuroradiology, surgical procedures and related neurosciences

RCT|prospective|retrospective|case Series|other View Source →
PubMed • 2023

DynamX sirolimus-eluting Bioadaptor versus the zotarolimus-eluting Resolute Onyx stent in patients with de novo coronary artery lesions: Design and rationale of the multi-center, international, randomized BIODAPTOR-RCT.

Cardiovascular revascularization medicine : including molecular interventions

RCT|prospective|retrospective|case Series|other View Source →
PubMed • 2023

Delayed Migration of Onyx Embolic Agent after Preoperative Embolization of an Arteriovenous Malformation in a Pediatric Patient: A Case Report and Review of the Literature.

Pediatric neurosurgery

RCT|prospective|retrospective|case Series|other View Source →
PubMed • 2023

The Era of Onyx Embolization: A Systematic and Literature Review of Preoperative Embolization Before Stereotactic Radiosurgery for the Management of Cerebral Arteriovenous Malformations.

World neurosurgery

RCT|prospective|retrospective|case Series|other View Source →
PubMed • 2023

Torcular dural AVF: Transvenous onyx embolisation with sinus reconstruction.

Clinical neurology and neurosurgery

View Source →
PubMed • 2023

Retrieval of a Fractured Marathon Microcatheter Entrapped in Onyx Using a Novel Stentriever-Assisted Technique.

Operative neurosurgery (Hagerstown, Md.)

RCT|prospective|retrospective|case Series|other View Source →
PubMed • 2022

Onyx™ Cast Fragmentation After Embolization of Endoleaks.

Journal of endovascular therapy : an official journal of the International Society of Endovascular Specialists

RCT|prospective|retrospective|case Series|other View Source →
PubMed • 2022

Comparative Evaluation of Conventional and OnyxCeph™ Dental Software Measurements on Cephalometric Radiography.

Turkish journal of orthodontics

RCT|prospective|retrospective|case Series|other View Source →
PubMed • 2021

Dosimetric comparison of iPlanⓇ Pencil Beam (PB) and Monte Carlo (MC) algorithms in stereotactic radiosurgery/radiotherapy (SRS/SRT) plans of intracranial arteriovenous malformations.

Medical dosimetry : official journal of the American Association of Medical Dosimetrists

Retrospective View Source →
PubMed • 2021

Transradial middle meningeal artery embolization for chronic subdural hematoma using Onyx: case series.

Journal of neurointerventional surgery

Case Series View Source →
PubMed • 2020

Percutaneous transorbital embolization of a carotid cavernous fistula.

Proceedings (Baylor University. Medical Center)

RCT|prospective|retrospective|case Series|other View Source →
PubMed • 2020

Comparison of short-term clinical outcomes between Resolute Onyx zotarolimus-eluting stents and everolimus-eluting stent in patients with acute myocardial infarction: Results from the Korea Acute Myocardial infarction Registry (KAMIR).

Cardiology journal

RCT|prospective|retrospective|case Series|other View Source →
PubMed • 2020

Device profile of the Resolute Onyx Zotarolimus eluting coronary stent system for the treatment of coronary artery disease: overview of its safety and efficacy.

Expert review of medical devices

RCT|prospective|retrospective|case Series|other View Source →

Frequently Asked Questions

What are the clinical indications for Onyx?

Onyx is indicated for use in embolization procedures, particularly in interventional neuroradiology for arteriovenous malformations and dural arteriovenous fistulas.

What outcomes have been reported in clinical studies?

Studies report effective occlusion of vascular structures and high devascularization rates in spinal tumor embolization with low complication rates.

What complications have been reported?

Safety data indicate complications such as delayed migration of the embolic agent, particularly in pediatric cases, though overall complication rates are low.

Disclaimer: This page compiles publicly available regulatory and published clinical evidence for educational reference. It does not constitute medical advice, product endorsement, or a recommendation for clinical use. Always consult manufacturer documentation and clinical judgment for patient care decisions.

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