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NCT Number: NCT07026877

Endovascular Repair With Fenestrated TREO Stent-Graft System in AAA

The goal of this clinical trial is to learn if the Fenestrated TREO Stent-Graft System works to treat abdominal aneurysms in adults. An abdominal aneurysm is a bulge in the main blood vessel (the aorta) which carries blood from the heart, through the chest and abdomen. It will also learn about the safety of Fenestrated TREO Stent-Graft System.

The main question it aims to answer is: Can the the Fenestrated TREO Stent-Graft System be used to treat participants with a specific type of abdominal aneurysm called a juxtarenal abdominal aortic aneurysm?

Participants will: Have the the Fenestrated TREO Stent-Graft System implanted via an endovascular surgical procedure and visit the hospital for a follow up period of 5 years, for checkups, tests and imaging scans.

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Key information

Conditions

Abdominal Aortic Aneurysms (AAA) Aneurysm Aortic Aneurysm Aortic Aneurysm, Abdominal Aortic Diseases Cardiovascular Diseases Vascular Diseases

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

UC Health Memorial, Colorado Springs, Colorado, United States

Loading trial locations.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • 18 years or older at the time of consent
  • Life expectancy is greater than 2 years
  • An abdominal aortic or aorto-iliac aneurysm requiring a fenestrated graft and with morphology suitable for endovascular repair (confirmed by Computed Tomography (CT) with contrast performed within 6 months of planned implant procedure) as follows:
  • Maximum aneurysm diameter of ≥5.5 cm for male ( ≥5.0 cm for female) or
  • Maximum AAA diameter exceeding two times the normal diameter just proximal to the aneurysm using orthogonal (i.e., perpendicular to the centerline) measurements (or saccular aneurysm that warrants treatment in the opinion of the investigator) or
  • Aneurysm with a history of growth > 0.5 cm in 6 months and
  • Minimum 0 mm of healthy aorta* below the most inferior renal artery that the physician plans on preserving and no renal artery involvement (juxtarenal aneurysms) or
  • At least one renal artery involved in the aneurysm and minimum 2 mm below the celiac (suprarenal aneurysms) *Healthy aorta is defined as segment of aorta with parallel aortic wall with minimal (<10%) or no difference in diameter and minimal atherosclerotic debris, thrombus, or calcification.
  • Proximal landing zone:
  • ≥20 mm length
  • 20-32 mm diameter
  • ≤60° angle relative to the axis of the suprarenal aorta
  • ≤60° angle relative to the long axis of the aneurysm
  • Distal (iliac) landing zone with:
  • 8-13 mm inside diameter/ ≥10 mm length
  • >13-20 mm inside diameter/ ≥15 mm length
  • Distal aortic diameter (above the iliac bifurcation) ≥70% of the sum of the iliac limb graft diameters
  • Minimum 18 mm aortic lumen diameter at the level of the fenestrations
  • Pathology that requires maximum 5 fenestrations in the main body
  • Pathology that requires fenestration a minimum 3 mm apart (edge to edge)
  • Branch vessels (to be bridged to the fenestrated graft) with:
  • 5-9 mm diameters
  • ≥13 mm distal landing zone (or ≥15 mm if there is a gap between fenestration and target vessel)
  • Adequate renal function to tolerate contrast-enhanced CTA
  • Adequate vascular access compatible with required delivery systems
  • Willingness to comply with the follow-up evaluation schedule documented in a signed informed consent prior to implant

Exclusion criteria

  • Pregnant or lactating
  • Existing endovascular graft in the treated segment intended to be repaired with the Fenestrated TREO Stent-Graft System
  • Dissection in abdominal aorta, ruptured aneurysm, or symptomatic aneurysm (as determined by treating physician)
  • Implant procedure as planned does not allow for at least one patent hypogastric artery left intact, unless both are occluded on pre-op imaging.
  • A branch vessel(s) that is dissected or has significant calcification, tortuosity, thrombus formation that would interfere with bridging stent delivery or sealing (as determined by treating physician)
  • Severe untreated coronary artery disease and/or unstable angina, significant areas of myocardium at risk (based on coronary angiogram or radionuclide scans), left ventricular ejection fraction <20%, or recent diagnosis of congestive heart failure (CHF; as determined by treating physician).
  • Stroke or myocardial infarction within 6 months of the planned treatment date
  • Chronic obstructive pulmonary disease requiring routine need for oxygen therapy outside the hospital setting (e.g., daily or nightly home use)
  • Chronic Kidney Disease (CKD) stage ≥3b.*
  • During Stage 2, patients with severe CKD (stage ≥3b) can be included in the Expanded Access Arm if otherwise eligible.
  • Active systemic infection or is suspected of having an active systemic infection (e.g., acquired immune deficiency syndrome (AIDS)/human immunodeficiency virus (HIV), sepsis)
  • Clinical conditions that would severely compromise or impair x-ray visualization of the aorta (as determined by treating physician).
  • History of an aortopathic connective tissue disease (e.g., Marfan's syndrome)
  • Mycotic aneurysm
  • Significant or circumferential calcification or mural thrombus (as determined by treating physician):
  • in the proximal aortic neck
  • in the distal iliac landing zone
  • within the treatment length, which may adversely impact device patency
  • Cannot receive intraprocedural anticoagulation per the investigator's standard of care, or antiplatelet therapy post-procedurally as per the investigator's standard of care.
  • Blood coagulation disorder or bleeding diathesis, the treatment for which cannot be suspended pre- and post-repair
  • An investigational study drug or biologic within 30 days of planned procedure or an investigational device within one year of planned procedure or any other treatment that may interfere with the interpretation of the study results.
  • Medical, social or psychological issues that the investigator believes may interfere with study treatment or follow-up.
  • Untreatable allergy or sensitivity to contrast media, nitinol/nickel, Tantalum, Platinum Iridium (PtIr), 316 stainless steel, ePTFE (expanded polytetrafluoroethylene), PTFE (polytetrafluoroethylene) Impregnated polyester fiber, or polyester
  • Other major surgical or medical intervention within 45 days of the planned procedure or plan to undergo other major surgical or medical intervention within 45 days post implantation (e.g., coronary artery bypass graft (CABG), organ transplantation, renal stenting)

Treatment and study plan

Fenestrated TREO Stent Graft System

Device

The Fenestrated TREO Stent-Graft System is a modular, endoluminal, over-the-wire system intended for the endovascular treatment of juxtarenal and pararenal to paravisceral aneurysms requiring a fenestrated stent-graft and having suitable morphology. The system is composed of the following components:

Fenestrated TREO Bifurcate Stent-Graft - The main body fenestrated bifurcate provides the following; proximal seal, fenestrations and gates for connection to the leg extensions.

Bridging Stents - The bridging stent connects the main body bifurcated device to the target visceral artery allowing the target anatomy to maintain perfusion while keeping the pathology sealed

TREO Leg and Straight Extension Stent-Grafts: The Leg Extension and Straight Extension stent-grafts are used to complete coverage of the pathology from the main body bifurcated device to the distal landing zones (usually the common iliac artery just proximal to the iliac bifurcation).

Primary outcomes

  1. Proportion of patients with absence of a major adverse event (Primary Safety Endpoint)

    Time frame: 30-day post-procedure

    The primary safety endpoint is the absence of a major adverse event (MAE) at 30-day post procedure.

    MAEs are defined as follows:

    • All-cause mortality, defined as death due to any cause
    • Myocardial infarction (new onset) based on the Society for Cardiovascular Angiography & Interventions (SCAI) definition
    • Respiratory failure requiring prolonged (>24 hours from anticipated) mechanical ventilation or reintubation
    • Renal function decline resulting in >50% reduction from baseline estimated glomerular filtration rate (eGFR) or new-onset dialysis
    • Bowel ischemia requiring surgical resection or not resolving with medical therapy
    • Disabling stroke (modified Rankin Scale (mRS) score ≥2 at 90 days post event and an increase in ≥1 mRS category from an individual's pre-stroke baseline, as direct result of the neurological event)
    • Paraplegia (grade 3, Society for Vascular Surgery (SVS) Thoracic Endovascular Aortic Repair (TEVAR) guidelines)

  2. Proportion of patients with successful aneurysm treatment through 12-months post-implant procedure (Primary Effectiveness Endpoint)

    Time frame: 12 months post-procedure

    The primary effectiveness endpoint is the proportion of patients with successful aneurysm treatment through 12-months post-implant procedure, which is a composite of technical success and absence of the following:

    • Aneurysm-related mortality: Death occurs within the first 30-days of the index procedure or a secondary intervention, OR any death that results from aneurysm rupture or an aorta-related complication (e.g., implant infection, occlusion, dissection)
    • Aneurysm rupture: Rupture of the native aneurysm sac (treated lesion)
    • Type I/III Endoleak
    • Aneurysm Expansion (>5 mm)
    • Migration (>10 mm)
    • Loss of patency (i.e., complete occlusion of the aortic implant and/or bridging stent(s))
    • Conversion to open surgical repair: Explant of the investigational device due to any cause
    • Secondary intervention (clinically significant) to address loss of patency, fixation or seal

  3. Successful delivery and deployment of the aortic stent-graft and all modular stent-graft components (Technical Success)

    Time frame: Evaluated 30-days post procedure

    Composite:

    • Successful access to the arterial system using remote arterial exposure, percutaneous technique, or open surgical conduit without the need for unanticipated corrective intervention related to access
    • Successful delivery and deployment of the aortic stent-graft and all modular stent-graft components without the need for unanticipated corrective intervention related to delivery and deployment
    • Successful side branch catheterization and placement of bridging stents with restoration and maintenance of flow in all intended target vessels without the need for unanticipated corrective intervention related to placement of the bridging stent(s)
    • Successful withdrawal of the delivery systems without the need for unanticipated corrective intervention related to withdrawal
    • Absence of Type I or III endoleaks (assessed by Computed Tomography Angiography, Magnetic Resonance Angiography, or duplex ultrasound)
    • Patency of all aortic modular stent graft components

Secondary outcomes

  1. All-Cause Mortality

    Time frame: Evaluated at all follow up visits which occur at the following timepoints: at discharge, 30 days post-procedure, six months post-procedure, 12-months post-procedure and annually thereafter through to five years post-procedure.

    Individual component of the primary safety endpoint - defined as death due to any cause

  2. Myocardial Infarction (new onset)

    Time frame: Evaluated at all follow up visits which occur at the following timepoints: at discharge, 30 days post-procedure, six months post-procedure, 12-months post-procedure and annually thereafter through to five years post-procedure.

    Individual component of the primary safety endpoint - based on the SCAI definition

  3. Respiratory failure

    Time frame: Evaluated at all follow up visits which occur at the following timepoints: at discharge, 30 days post-procedure, six months post-procedure, 12-months post-procedure and annually thereafter through to five years post-procedure.

    Individual component of the primary safety endpoint - respiratory failure requiring prolonged (>24 hours from anticipated) mechanical ventilation or reintubation

  4. Renal function decline

    Time frame: Evaluated at all follow up visits which occur at the following timepoints: at discharge, 30 days post-procedure, six months post-procedure, 12-months post-procedure and annually thereafter through to five years post-procedure.

    Individual component of the primary safety endpoint - Renal function decline resulting in >50% reduction from baseline eGFR or new-onset dialysis

  5. Bowel ischemia

    Time frame: Evaluated at all follow up visits which occur at the following timepoints: at discharge, 30 days post-procedure, six months post-procedure, 12-months post-procedure and annually thereafter through to five years post-procedure.

    Individual component of the primary safety endpoint - Bowel ischemia requiring surgical resection or not resolving with medical therapy

  6. Disabling stroke

    Time frame: Evaluated at all follow up visits which occur at the following timepoints: at discharge, 30 days post-procedure, six months post-procedure, 12-months post-procedure and annually thereafter through to five years post-procedure.

    Individual component of the primary safety endpoint - Disabling stroke (mRS score ≥2 at 90 days post event and an increase in ≥1 mRS category from an individual's pre-stroke baseline, as direct result of the neurological event)

  7. Paraplegia

    Time frame: Evaluated at all follow up visits which occur at the following timepoints: at discharge, 30 days post-procedure, six months post-procedure, 12-months post-procedure and annually thereafter through to five years post-procedure.

    Individual component of the primary safety endpoint -Paraplegia grade 3, as per SVS TEVAR guidelines

  8. Aneurysm-related mortality

    Time frame: Evaluated at all follow up visits which occur at the following timepoints: at discharge, 30 days post-procedure, six months post-procedure, 12-months post-procedure and annually thereafter through to five years post-procedure.

    Individual components of the primary effectiveness endpoint - defined as death which occurs within the first 30-days of the index procedure or a secondary intervention, OR any death that results from aneurysm rupture or an aorta-related complication (e.g., implant infection, occlusion, dissection)

  9. Aneurysm rupture

    Time frame: Evaluated at all follow up visits which occur at the following timepoints: at discharge, 30 days post-procedure, six months post-procedure, 12-months post-procedure and annually thereafter through to five years post-procedure.

    Individual components of the primary effectiveness endpoint - Rupture of the native aneurysm sac (treated lesion)

  10. Type I/III Endoleak

    Time frame: Evaluated at all follow up visits which occur at the following timepoints: at discharge, 30 days post-procedure, six months post-procedure, 12-months post-procedure and annually thereafter through to five years post-procedure.

    Individual components of the primary effectiveness endpoint - Presence of Type I/IIIEndoleak as confirmed by imaging

  11. Aneurysm Expansion

    Time frame: Evaluated at all follow up visits which occur at the following timepoints: at discharge, 30 days post-procedure, six months post-procedure, 12-months post-procedure and annually thereafter through to five years post-procedure.

    Individual components of the primary effectiveness endpoint - Aneurysm expansion (>5 mm)

  12. Device Migration

    Time frame: Evaluated at all follow up visits which occur at the following timepoints: at discharge, 30 days post-procedure, six months post-procedure, 12-months post-procedure and annually thereafter through to five years post-procedure.

    Individual components of the primary effectiveness endpoint - Device migration (>10mm)

  13. Loss of device patency

    Time frame: Evaluated at all follow up visits which occur at the following timepoints: at discharge, 30 days post-procedure, six months post-procedure, 12-months post-procedure and annually thereafter through to five years post-procedure.

    Individual components of the primary effectiveness endpoint - complete occlusion of the aortic implant and/or bridging stent(s)

  14. Conversion to open surgical repair

    Time frame: Evaluated at all follow up visits which occur at the following timepoints: at discharge, 30 days post-procedure, six months post-procedure, 12-months post-procedure and annually thereafter through to five years post-procedure.

    Individual components of the primary effectiveness endpoint - Explant of the investigational device due to any cause

  15. Secondary intervention (clinically significant) to address loss of patency, fixation or seal

    Time frame: Evaluated at all follow up visits which occur at the following timepoints: at discharge, 30 days post-procedure, six months post-procedure, 12-months post-procedure and annually thereafter through to five years post-procedure.

    Individual components of the primary effectiveness endpoint. This includes the following reasons for re-intervention:

    Loss of Patency: Complete occlusion of the aortic endovascular graft, bridging stent(s), and/or limb(s) Seal: Type Ia/Ib, IIIa/IIIb/IIIc Endoleaks Fixation: Fracture, Kink, Migration Device System Prophylaxis: Device-related Reintervention requiring hospitalization

    Minor Secondary Interventions will not count against the endpoint and include the following:

    Endovascular procedures (completed for any reason), specifically percutaneous transluminal angioplasty, atherectomy, stenting without thrombectomy or thrombolysis Interventions to address branch vessel stenosis Interventions to address Type II endoleaks Minor surgical revisions (e.g., patch angioplasty) of the access vessel

  16. Technical Success (at the index procedure)

    Time frame: At time of index procedure

    Technical Success (at the index procedure) is a composite of the following:

    • Successful access to the arterial system using remote arterial exposure, percutaneous technique, or open surgical conduit without the need for unanticipated corrective intervention related to access.
    • Successful delivery and deployment of the aortic stent-graft and all modular stent-graft components without the need for unanticipated corrective intervention related to delivery and deployment.
    • Successful side branch catheterization and placement of bridging stents with restoration and maintenance of flow in all intended target vessels without the need for unanticipated corrective intervention related to placement of the bridging stent(s)
    • Successful withdrawal of the delivery systems without the need for unanticipated corrective intervention related to withdrawal.

  17. Presence of endoleak

    Time frame: Evaluated at all follow up visits which occur at the following timepoints: at discharge, 30 days post-procedure, six months post-procedure, 12-months post-procedure and annually thereafter through to five years post-procedure.

    Evaluation of the presence of all endoleak types, as confirmed by imaging

  18. Aneurysm size changes

    Time frame: Evaluated at all follow up visits which occur at the following timepoints: at discharge, 30 days post-procedure, six months post-procedure, 12-months post-procedure and annually thereafter through to five years post-procedure.

    Evaluation of changes in aneurysm size. Enlargement is defined as >5mm, regression is ≥ 5 mm.

  19. Device Migration Evaluation

    Time frame: Evaluated at all follow up visits which occur at the following timepoints: at discharge, 30 days post-procedure, six months post-procedure, 12-months post-procedure and annually thereafter through to five years post-procedure.

    Evaluation of device migration. Migration is defined as >10mm.

  20. Patency related observations

    Time frame: Evaluated at all follow up visits which occur at the following timepoints: at discharge, 30 days post-procedure, six months post-procedure, 12-months post-procedure and annually thereafter through to five years post-procedure.

    Stenosis and occlusion of the components of the Fenestrated TREO Stent-Graft System

  21. Loss of device integrity

    Time frame: Evaluated at all follow up visits which occur at the following timepoints: at discharge, 30 days post-procedure, six months post-procedure, 12-months post-procedure and annually thereafter through to five years post-procedure.

    Fracture of stent strut, barb, or fenestration ring in Fenestrated TREO, fracture of stent in any Fenestrated TREO system implant

  22. Target vessel instability

    Time frame: Evaluated at all follow up visits which occur at the following timepoints: at discharge, 30 days post-procedure, six months post-procedure, 12-months post-procedure and annually thereafter through to five years post-procedure.

    Target vessel instability is a composite endpoint consisting of the following side branch complications:

    • Death related to side branch complication(s)
    • Rupture related to side branch complication(s)
    • Secondary intervention to address a side branch-related complication

  23. Secondary interventions related to the device/treated lesion

    Time frame: Evaluated at all follow up visits which occur at the following timepoints: at discharge, 30 days post-procedure, six months post-procedure, 12-months post-procedure and annually thereafter through to five years post-procedure.

    Any secondary interventions that are performed that are related to the device or the treated lesion will be recorded.

  24. Target vessel complications

    Time frame: Evaluated at all follow up visits which occur at the following timepoints: at discharge, 30 days post-procedure, six months post-procedure, 12-months post-procedure and annually thereafter through to five years post-procedure.

    Including dissection and/or perforation

  25. Access-related complications

    Time frame: Evaluated at all follow up visits which occur at the following timepoints: at discharge, 30 days post-procedure, six months post-procedure, 12-months post-procedure and annually thereafter through to five years post-procedure.

    Access-related complications

  26. Serious Adverse Events

    Time frame: Evaluated at all follow up visits which occur at the following timepoints: at discharge, 30 days post-procedure, six months post-procedure, 12-months post-procedure and annually thereafter through to five years post-procedure.

    As per protocol definition

  27. Operative metrics - Time

    Time frame: Perioperative

    Information relating to the time of the surgical procedure such as start time, stop time, duration of procedure (min) and length of endovascular time (min)

  28. Operative metrics - Number of Vessels intended to be Perfused via Fenestrated TREO Fenestrations

    Time frame: Evaluated at time of implant

    Information relating to the number and name of the vessels to be perfused via the Fenestrated TREO Fenestrations

  29. Operative metrics - Mechanism of access

    Time frame: Evaluated at time of implant

    Information relating to the mechanism of access for the endovascular procedure

  30. Radiation Exposure - Fluoroscopy Time

    Time frame: Evaluated at time of implant

    Fluoroscopy time (min)

  31. Radiation Exposure - Total volume of Contrast

    Time frame: Evaluated at time of implant

    Volume of contrast used during procedure measured in mL

Study contacts

Contact information is provided by the study sponsor or research team.

Lauren Rider

CONTACT

[email protected]

19545470374

Valerie Merkle

CONTACT

[email protected]

+1 954 838 9699

Sponsors and collaborators

Lead sponsor

Bolton Medical

Industry

Registry information

Official study title

A Prospective, Multicenter, Non-Blinded, Non-Randomized Pivotal Study of the Fenestrated TREO Stent-Graft System in Subjects With Abdominal Aortic Aneurysms Requiring a Fenestrated Graft and Suitable for Endovascular Repair

Important dates

Study start
2025
Primary completion
2027
Study completion
2030
First posted
Jun 18, 2025
Registry last updated
Feb 18, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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