Below is an educational, technical answer to a question many patients and clinicians ask. Thoracic endovascular aortic repair (TEVAR) treats thoracic aortic aneurysms with a stent graft placed in the descending thoracic aorta. 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
Thoracic endovascular aortic repair (TEVAR) treats thoracic aortic aneurysms with a stent graft placed in the descending thoracic aorta. 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. Repair strategy depends on the segment involved, with distinct considerations for the abdominal aorta below the kidneys and the thoracic aorta in the chest.
What size aneurysm requires surgery?
Published guidance commonly cites a diameter around 5.5 cm as a typical threshold at which repair of an abdominal aortic aneurysm is considered, though thresholds vary by sex and situation. Rapid growth or symptoms can lower the threshold at which intervention is discussed, regardless of absolute size. The threshold balances the risk of rupture against the risk of the repair itself. Whether and when to intervene is determined by the treating clinician using current criteria and the individual's imaging.
What This Means in Practice
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. Manufacturer descriptions of flow modulation and radial support reflect design intent rather than guaranteed clinical outcomes.
Key Considerations
- All INVAMED aortic devices are intended for use by trained vascular specialists under imaging guidance and per the IFU.
- Lifelong imaging surveillance is a standard requirement after endovascular repair to detect endoleak or migration.
- 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.
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.
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
Follow-up imaging is used to confirm that the sac remains excluded and stable over time. Landing-zone length and proximity to arch branch vessels are key planning factors evaluated by the operator. Manufacturer descriptions of flow modulation and radial support reflect design intent rather than guaranteed clinical outcomes. 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. The decision to pursue a branch-preserving device rather than a covered graft rests with the treating clinician. INVAMED's Atlas Endovascular Stent Graft and Atlas Aortic Stent Graft are positioned for this sac-exclusion role in the abdominal aorta. Suitability for a flow-modulating approach is highly anatomy-dependent and is determined by the vascular specialist. INVAMED's STENA MFM is designed to modulate flow without covering branch vessels, positioning it for anatomies where preserving branches is a priority.
Related on INVAMED
- Aortic Aneurysm & Dissection Repair — product category
- Atlas Endovascular Stent Graft: Features, Specifications and Clinical Role
- Comparing TEVAR and Open thoracic surgery
- Understanding Bare Aortic Nitinol Stents
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.