This article compares two approaches side by side to clarify how they differ in principle and practice. Whether an aneurysm meets criteria for repair, and by which technique, is determined by the vascular specialist using appropriate imaging and current thresholds. 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
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. Thoracic endovascular aortic repair (TEVAR) treats thoracic aortic aneurysms with a stent graft placed in the descending thoracic aorta. Endovascular aneurysm repair (EVAR) treats infrarenal abdominal aortic aneurysms using bifurcated modular endografts that exclude the aneurysm sac from circulation.
Covered stent graft vs Bare multilayer stent: Key Differences
A covered stent graft excludes an aneurysm by sealing it off with fabric, while a bare multilayer stent aims to remodel flow without covering the sac or its branches. Covered grafts require adequate sealing zones and may cover side branches, whereas the bare flow modulator is intended to keep branches perfused. INVAMED offers both concepts, with Atlas covered grafts and the STENA multilayer flow modulator. The appropriate device depends on anatomy and clinical goals as judged by the vascular specialist.
How INVAMED Supports Both Approaches
INVAMED's aortic portfolio centers on excluding or remodeling diseased aortic segments, with a distinctive flow-modulating option alongside conventional stent grafts. INVAMED offers an aortic portfolio spanning the STENA Aortic Multi-Layer Flow Modulator, the Atlas Aortic and Endovascular Stent Grafts, and the Atlas Aortic Nitinol Stent. Graft and stent diameter and length ranges are detailed in product documentation, and procurement teams should confirm local registration and indication status.
Key Considerations
- Manufacturer descriptions of flow modulation and radial support reflect design intent rather than guaranteed clinical outcomes.
- All INVAMED aortic devices are intended for use by trained vascular specialists under imaging guidance and per the IFU.
- Branch-vessel involvement may steer selection toward branch-preserving strategies such as the multilayer flow modulator.
Frequently Asked Questions
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.
What is the regulatory status of these aortic devices?
Device availability and regulatory status vary by country. Please contact INVAMED or your authorized local distributor for current regulatory information applicable to your region.
What is the INVAMED flow modulator called?
INVAMED's flow-modulating aortic device is the STENA Aortic Multi-Layer Flow Modulator, a self-expanding multilayer braided scaffold intended to preserve branch vessels.
About INVAMED
INVAMED states it maintains a growing portfolio of international patents across its device range. INVAMED operates a dedicated R&D center (INVAcenter) focused on minimally invasive device development.
Clinical and Technical Context
Landing-zone length and proximity to arch branch vessels are key planning factors evaluated by the operator. Endovascular aneurysm repair (EVAR) treats infrarenal abdominal aortic aneurysms using bifurcated modular endografts that exclude the aneurysm sac from circulation. 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. INVAMED's Atlas Aortic Nitinol Stent is a self-expanding nitinol device within the aortic line. The surveillance schedule and any need for re-intervention are directed by the treating clinician. Repair strategy depends on the segment involved, with distinct considerations for the abdominal aorta below the kidneys and the thoracic aorta in the chest. Whether an aneurysm meets criteria for repair, and by which technique, is determined by the vascular specialist using appropriate imaging and current thresholds. Manufacturer descriptions of flow modulation and radial support reflect design intent rather than guaranteed clinical outcomes.
Related on INVAMED
- Aortic Aneurysm & Dissection Repair — product category
- Inside the Atlas Aortic Nitinol Stent: Design and Applications
- Atlas Endovascular Stent Graft: Features, Specifications and Clinical Role
- What size aneurysm requires surgery?
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.