This article explains, in educational terms, tevar thoracic stent graft — 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. 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 Repair (TEVAR)
TEVAR places a stent graft within the descending thoracic aorta to exclude a thoracic aneurysm or to cover an entry tear in certain dissections. The covered graft redirects blood through a stable channel and depresses pressure on the aneurysm wall or false lumen. INVAMED's Atlas aortic stent-graft line addresses thoracic applications within the endovascular portfolio. Landing-zone length and proximity to arch branch vessels are key planning factors evaluated by the operator.
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
- Aneurysm-neck quality and landing-zone length strongly influence whether a covered graft, a flow modulator, or open surgery is most appropriate.
- 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
Are these aortic devices CE marked?
Device availability and regulatory status vary by country. Please contact INVAMED or your authorized local distributor for current regulatory information applicable to your region.
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.
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
INVAMED operates a dedicated R&D center (INVAcenter) focused on minimally invasive device development. INVAMED states it maintains a growing portfolio of international patents across its device range.
Clinical and Technical Context
INVAMED's STENA Aortic Multi-Layer Flow Modulator uses a 3D-braided five-layer superalloy design with a micro-porous mesh intended to optimize laminar flow while maintaining radial support and conformability. All INVAMED aortic devices are intended for use by trained vascular specialists under imaging guidance and per the IFU. Landing-zone length and proximity to arch branch vessels are key planning factors evaluated by the operator. Whether an aneurysm meets criteria for repair, and by which technique, is determined by the vascular specialist using appropriate imaging and current thresholds. Accurate, calibrated cross-sectional imaging is essential for sizing, oversizing, and defining adequate sealing zones before an endovascular repair. Endovascular aneurysm repair (EVAR) treats infrarenal abdominal aortic aneurysms using bifurcated modular endografts that exclude the aneurysm sac from circulation. INVAMED's STENA MFM is designed to modulate flow without covering branch vessels, positioning it for anatomies where preserving branches is a priority. Follow-up imaging is used to confirm that the sac remains excluded and stable over time.
Related on INVAMED
- Aortic Aneurysm & Dissection Repair — product category
- Sealing and Fixation Zones: How It Works and Why It Matters
- Understanding Bare Aortic Nitinol Stents
- How long is recovery after endovascular aneurysm repair?
Important Disclaimer
This content is educational and technical in nature and must not be interpreted as medical advice or as a promise of any clinical outcome. Individual results depend on many factors and can only be evaluated by a treating physician. Figures attributed to INVAMED reflect manufacturer or published data and are not a guarantee of results. All INVAMED devices are to be used by trained clinicians per the approved IFU, and availability is subject to local regulatory status.
Reviewed by the INVAMED Medical Affairs team. Content is educational and technical in nature.