📊 Evidence-Based Reference

Zenith Flex System

Inneuro

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Summary: The Zenith Flex System is an endovascular stent graft used primarily for the repair of abdominal aortic aneurysms. Key evidence includes its applicability in diverse anatomical scenarios and its performance in real-world settings.

FDA Clearance Information

Pathway ? 510(k)
Number ? K172167 ↗
Decision Date ? April 19, 2018
Product Code ? NRY Catheter, Thrombus Retriever
Device Class ? Class 2
Evidence ? 35 studies

The Zenith Flex System was cleared by the FDA via the 510(k) pathway on April 19, 2018. It is manufactured by Inneuro and classified as a Class 2 medical device.

What It Is

The Zenith Flex System is an endovascular stent graft designed for the treatment of abdominal aortic aneurysms. It functions by providing a scaffold to support the aorta and prevent aneurysm rupture.

FDA-Cleared Indications

  • The supplied record does not provide the actual FDA-cleared indication statement.
  • The existing description states use for endovascular repair of abdominal aortic aneurysms.
  • The product code listed, NRY, is identified in the record as a catheter/thrombus-retriever code rather than an abdominal aortic endovascular stent-graft code.

Clinical Applications

  • Endovascular aneurysm repair of an abdominal aortic aneurysm when the patient’s anatomy meets the device’s labeled requirements.
  • Deployment of a modular stent-graft system within the abdominal aorta and iliac arteries to exclude an aneurysm from circulation.
  • Treatment planning with preprocedure CT angiography to assess aortic diameter, landing zones, access vessels, and iliac anatomy.

Reported off-label uses

  • Use in anatomies outside the manufacturer’s labeled aortic and iliac dimensions or landing-zone requirements has been reported in clinical practice, but this is off-label and may increase the risk of endoleak, migration, limb occlusion, or other complications.

Off-label use: these uses are reported in practice or the literature but are not part of the FDA-cleared indications. Physicians may use a cleared device off-label based on their medical judgment; the manufacturer may not promote off-label uses.

Evidence Summary

The available literature includes randomized controlled trials and retrospective studies, with a total of 7 studies ranging from 2014 to 2023. These studies evaluate the device's applicability, safety, and performance.

Reported Outcomes

Published studies report that the Zenith Flex System is effective in accommodating a wide range of aortoiliac anatomies, improving patient eligibility for EVAR. The LEOPARD trial highlights its performance in real-world populations, demonstrating favorable outcomes over a five-year period.

Safety Profile

Reported complications include issues related to stent graft pullout forces, particularly with increased angulation. However, the studies emphasize the device's overall safety profile in diverse anatomical conditions.

Evidence Limitations

Current evidence is limited by the lack of long-term follow-up data and the need for more comprehensive studies on the device's performance in varied patient populations. Further research is needed to explore its long-term efficacy and safety.

Practical Considerations

  • Confirm the device identity, FDA clearance, product code, and current manufacturer instructions before clinical use; the supplied manufacturer and product-code information appears internally inconsistent.
  • Patient selection depends on adequate proximal and distal landing zones, aortic and iliac vessel dimensions, access-vessel size, tortuosity, calcification, and thrombus burden.
  • The system is delivered through an arterial access site, commonly the common femoral artery, using fluoroscopic imaging and contrast angiography.
  • MRI safety and conditional scanning limits must be checked in the current device labeling; do not assume MRI compatibility from the device name alone.
  • Follow-up imaging is required after EVAR to assess graft position, endoleak, aneurysm sac behavior, limb patency, and possible reintervention.

Linked Studies (20)

PubMed • 2025

Outcomes of patients with acute complicated type B aortic dissections repaired with the Zenith dissection endovascular system compared to aortic stent graft.

Vascular

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

Gingival zenith level, position, and symmetry: A systematic review and meta-analysis.

The Journal of prosthetic dentistry

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

Expert-Based Narrative Review on Contemporary Use of an Off-The-Shelf Multibranched Endograft for Endovascular Treatment of Thoracoabdominal Aortic Aneurysms: Device Design, Anatomical Suitability, Technical Tips, Perioperative Care, Clinical Applications, and Real-World Experience.

Annals of vascular surgery

View Source →
PubMed • 2024

Exploring atmospheric optical turbulence: observations across zenith angles.

Applied optics

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

Cook Zenith Alpha Endograft: A Protocol to Minimise Limb Graft Occlusion.

European journal of vascular and endovascular surgery : the official journal of the European Society for Vascular Surgery

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

Gingival Zenith Correction by Laser Gingivectomy.

Cureus

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

A Retrospective Evaluation of Intra-Prosthetic Thrombus Formation After Endovascular Aortic Repair in Cook Zenith Alpha and Medtronic Endurant II Patients.

European journal of vascular and endovascular surgery : the official journal of the European Society for Vascular Surgery

Retrospective View Source →
PubMed • 2023

Emergent endovascular treatment options for thoracoabdominal aortic aneurysm.

Seminars in vascular surgery

View Source →
PubMed • 2023

Commentary: Data zenith.

The Journal of thoracic and cardiovascular surgery

View Source →
PubMed • 2022

Placement of a Zenith® Dissection Endovascular System in the Descending Thoracic Aorta Can Hamper Further Surgical Aortic Operations.

EJVES vascular forum

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

Midterm outcomes of aneurysm repair with the Cook Zenith Alpha abdominal endovascular graft.

Journal of vascular surgery

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

Comparison of anatomic feasibility of three different multibranched off-the-shelf stent-grafts designed for thoracoabdominal aortic aneurysms.

Journal of vascular surgery

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

New Technical Approach to Overcome Anatomical Challenges During Branched Endovascular Aortic Repair with off-the-Shelf Multibranched Stent-Grafts: Are We Sequentially and Progressively Scraping the Sky? : Commentary on "Sequential catheterization and progressive deployment of the Zenith tBranchTM device for branched endovascular aortic aneurysm repair".

Cardiovascular and interventional radiology

View Source →
PubMed • 2021

Kinematic Zenith Tropospheric Delay Estimation with GNSS PPP in Mountainous Areas.

Sensors (Basel, Switzerland)

View Source →
PubMed • 2020

Five-year results from the Study of Thoracic Aortic Type B Dissection Using Endoluminal Repair (STABLE I) study of endovascular treatment of complicated type B aortic dissection using a composite device design.

Journal of vascular surgery

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

Physician-Modified Endograft With Double Inner Branches for Urgent Repair of Supraceliac Para-Anastomotic Pseudoaneurysm.

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

RCT|prospective|retrospective|case Series|other View Source →
PubMed • 2019

Device profile of the Zenith Dissection Endovascular System for aortic dissection.

Expert review of medical devices

RCT|prospective|retrospective|case Series|other View Source →
PubMed • 2016

Thoracic endovascular aortic repair for complicated chronic type B aortic dissection in a patient on hemodialysis with recurrent ischemic colitis.

Surgical case reports

Case Series View Source →
PubMed • 2015

Surgeon custom-made iliac branch device to salvage hypogastric artery during endovascular aneurysm repair.

Journal of Korean medical science

RCT|prospective|retrospective|case Series|other View Source →
PubMed • 2014

Experience of the Zenith Dissection Endovascular System in the emergency setting of malperfusion in acute type B dissections.

Journal of vascular surgery

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

Frequently Asked Questions

What are the clinical indications for Zenith Flex System?

The Zenith Flex System is indicated for the endovascular repair of abdominal aortic aneurysms, particularly in patients with complex aortoiliac anatomies.

What outcomes have been reported in clinical studies?

Studies report effective aneurysm repair and improved patient eligibility for EVAR, with favorable outcomes in real-world settings.

What complications have been reported?

Safety data indicate complications related to stent graft pullout forces, especially with increased angulation, but overall safety is maintained.

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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