This article explains, in educational terms, aortic sealing and fixation — how the technology works and where it fits. Repair strategy depends on the segment involved, with distinct considerations for the abdominal aorta below the kidneys and the thoracic aorta in the chest. 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 aneurysm repair (EVAR) treats infrarenal abdominal aortic aneurysms using bifurcated modular endografts that exclude the aneurysm sac from circulation. Thoracic endovascular aortic repair (TEVAR) treats thoracic aortic aneurysms with a stent graft placed in the descending thoracic aorta. 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.
Sealing and Fixation Zones
Endovascular grafts rely on healthy sealing zones above and below the aneurysm where the device apposes the aortic wall to prevent blood from entering the sac. Appropriate device oversizing relative to the native aorta helps achieve a seal and secure fixation. INVAMED provides diameter and length options across its Atlas aortic grafts to accommodate a range of neck and landing-zone dimensions. Sizing and oversizing decisions are made from calibrated imaging by the operator, following the device instructions for use.
Design and Technical Notes
INVAMED's aortic portfolio centers on excluding or remodeling diseased aortic segments, with a distinctive flow-modulating option alongside conventional stent grafts. Manufacturer descriptions of flow modulation and radial support reflect design intent rather than guaranteed clinical outcomes. Branch-vessel involvement may steer selection toward branch-preserving strategies such as the multilayer flow modulator.
Key Considerations
- Lifelong imaging surveillance is a standard requirement after endovascular repair to detect endoleak or migration.
- All INVAMED aortic devices are intended for use by trained vascular specialists under imaging guidance and per the IFU.
- Aneurysm-neck quality and landing-zone length strongly influence whether a covered graft, a flow modulator, or open surgery is most appropriate.
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 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.
Does the flow modulator cover branch vessels?
INVAMED describes the STENA MFM as branch-preserving, designed to modulate blood flow without covering branch vessels; suitability is determined by the clinician.
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
Suitability for a flow-modulating approach is highly anatomy-dependent and is determined by the vascular specialist. Manufacturer descriptions of flow modulation and radial support reflect design intent rather than guaranteed clinical outcomes. INVAMED's STENA MFM is designed to modulate flow without covering branch vessels, positioning it for anatomies where preserving branches is a priority. Repair strategy depends on the segment involved, with distinct considerations for the abdominal aorta below the kidneys and the thoracic aorta in the chest. Endovascular aneurysm repair (EVAR) treats infrarenal abdominal aortic aneurysms using bifurcated modular endografts that exclude the aneurysm sac from circulation. Where a bare stent fits into a given repair is a technical decision made by the vascular specialist. Lifelong imaging surveillance is a standard requirement after endovascular repair to detect endoleak or migration. All INVAMED aortic devices are intended for use by trained vascular specialists under imaging guidance and per the IFU.
Related on INVAMED
- Aortic Aneurysm & Dissection Repair — product category
- Multilayer Flow Modulator (MFM): How It Works and Why It Matters
- What size aneurysm requires surgery?
- Aortic Aneurysm & Dissection Repair: A Complete Technical Guide
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.