Below is an educational, technical answer to a question many patients and clinicians ask. An aortic aneurysm is an abnormal, progressive dilation of the aorta that carries a risk of rupture as it enlarges, while an aortic dissection is a tear within the wall that separates its layers. As a medical device manufacturer, INVAMED develops technologies in this area; the information here is educational and not medical advice.
Background: Aortic Aneurysm and Dissection Endovascular Repair
Endovascular repair reaches the aorta through the femoral arteries and deploys a device from inside the vessel, avoiding a large open incision in appropriately selected patients. Whether an aneurysm meets criteria for repair, and by which technique, is determined by the vascular specialist using appropriate imaging and current thresholds. Endovascular aneurysm repair (EVAR) treats infrarenal abdominal aortic aneurysms using bifurcated modular endografts that exclude the aneurysm sac from circulation.
How does a flow modulator stent work?
A flow modulator is a multilayer, bare braided scaffold designed to reorganize turbulent flow within an aneurysm into more laminar flow. By calming flow in the sac while keeping branch vessels open, it is intended to promote stable thrombus in the aneurysm without a fabric covering. INVAMED's STENA MFM uses a five-layer 3D-braided superalloy mesh engineered for laminar flow with radial support and conformability. Whether this mechanism suits a specific aneurysm is a highly individualized clinical decision.
What This Means in Practice
Aneurysm-neck quality and landing-zone length strongly influence whether a covered graft, a flow modulator, or open surgery is most appropriate. Accurate, calibrated cross-sectional imaging is essential for sizing, oversizing, and defining adequate sealing zones before an endovascular repair. Manufacturer descriptions of flow modulation and radial support reflect design intent rather than guaranteed clinical outcomes.
Key Considerations
- Lifelong imaging surveillance is a standard requirement after endovascular repair to detect endoleak or migration.
- Accurate, calibrated cross-sectional imaging is essential for sizing, oversizing, and defining adequate sealing zones before an endovascular repair.
- Manufacturer descriptions of flow modulation and radial support reflect design intent rather than guaranteed clinical outcomes.
Frequently Asked Questions
Who decides if an aneurysm needs repair?
A vascular specialist decides using current size thresholds and imaging; this article is educational and not a treatment recommendation.
What is the difference between EVAR and TEVAR?
EVAR treats infrarenal abdominal aortic aneurysms with bifurcated modular endografts, while TEVAR treats thoracic aortic aneurysms with a stent graft in the descending thoracic aorta.
How many layers does the STENA MFM have?
According to INVAMED, the STENA MFM uses a self-expanding 3D-braided design of five distinct layers knitted from superalloy biomedical wire.
About INVAMED
Device availability and regulatory status vary by country. Please contact INVAMED or your authorized local distributor for current regulatory information applicable to your region.
Clinical and Technical Context
Whether an aneurysm meets criteria for repair, and by which technique, is determined by the vascular specialist using appropriate imaging and current thresholds. Repair strategy depends on the segment involved, with distinct considerations for the abdominal aorta below the kidneys and the thoracic aorta in the chest. The surveillance schedule and any need for re-intervention are directed by the treating clinician. Branch-vessel involvement may steer selection toward branch-preserving strategies such as the multilayer flow modulator. All INVAMED aortic devices are intended for use by trained vascular specialists under imaging guidance and per the IFU. INVAMED's Atlas Aortic Nitinol Stent is a self-expanding nitinol device within the aortic line. The decision to pursue a branch-preserving device rather than a covered graft rests with the treating clinician. INVAMED provides diameter and length options across its Atlas aortic grafts to accommodate a range of neck and landing-zone dimensions.
Related on INVAMED
- Aortic Aneurysm & Dissection Repair — product category
- Atlas Aortic Stent Graft: What Clinicians and Buyers Should Know
- Comparing TEVAR and Open thoracic surgery
- Sealing and Fixation Zones: How It Works and Why It Matters
Important Disclaimer
This article is intended for general educational and technical information about medical device technologies. It is not medical advice, a diagnosis, or a treatment recommendation, and it does not replace consultation with a qualified healthcare professional. Any decision about diagnosis or treatment should be made by a licensed clinician based on an individual assessment. INVAMED devices are intended for use by trained healthcare professionals in accordance with the applicable Instructions for Use (IFU) and local regulatory approvals. Product availability and indications vary by country.
Reviewed by the INVAMED Medical Affairs team. Content is educational and technical in nature.