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CompletedNCT04704258NAUTILUSUpdated Feb 23, 2024

NAUTILUS CE-mark Trial of the FLOWer Cerebral Embolic Protection Device

An interventional study of TAVI (Transcatheter Aortic Valve Implant) and FLOWer Embolic Protection System in Aortic Valve Stenosis and Intracranial Embolism and Thrombosis, sponsored by AorticLab Srl. Completed at 8 sites in 2 countries. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2024-02-23.

Sponsored by AorticLab Srl · Not applicable, Interventional, and Other

Phase
Not applicable
Study type
Interventional
Enrollment
100
Allocation
Not applicable
Ages
18 Years and older
Sex
All
01

Study summary

The purpose of this clinical study is to assess the safety, performance, and treatment effect of the use of the AorticLab FLOWer System, in preventing cerebral thromboembolic complications in patients with indication for a TAVI (Transcatheter Aortic Valve Implant).

Read the detailed description

A single arm, prospective, multicenter non-randomized clinical study of the AorticLab FLOWer System to prevent embolic complications during transcatheter aortic valve procedures.

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Conditions studied

  • Aortic Valve Stenosis
  • Intracranial Embolism and Thrombosis

Keywords

  • TAVI
  • Transcatheter Anti-embolic Filter
  • Cerebral Embolic Protection
  • Embolic Protection Device
  • Debris
  • Embolic material
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In context

Intracranial Embolism

29 studies on the registry are indexed under Intracranial Embolism; none are open to participants now.

This study's enrollment of 100 is close to the median of 100 across 18 interventional studies indexed under Intracranial Embolism.

Browse Intracranial Embolism studies →

Lead sponsor

This is the only study on the registry with AorticLab Srl as lead sponsor.

Counted across the registry records on this site, refreshed daily.

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Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
No

Inclusion criteria

  1. Subjects of age ≥ 18 years
  2. Subject is scheduled to undergo transfemoral aortic valve implant (TAVI) procedure on a stenotic native aortic valve and is qualified based on pre-operative CT-scan examination (trans-thoracic echocardiogram (TTE) can be used as confirmatory assessment)
  3. Subject anatomy with Ilio-femoral artery segment compatible with a 12 F device catheter size
  4. The subject and the treating physician agree that the subject will undergo the scheduled pre-procedural testing and return for all required post-procedure follow-up visits
  5. The subject, or legally authorized representative, has been informed of the nature of the study, agrees to its provisions and has provided written informed consent, approved by the appropriate Medical Ethics Committee (EC) or Institutional Review Board (IRB)

Exclusion criteria

Exclusion Criteria:

Clinical exclusion criteria (preoperative screening)

  1. Subjects with hypercoagulable state that cannot be corrected by additional periprocedural heparin
  2. Subjects with contraindication to cerebral MRI
  3. Subjects with a history of a stroke or transient ischemic attack within the prior 6 months
  4. Subjects with known diagnosis of acute myocardial infarction (AMI) within 30 days preceding the index procedure
  5. Renal insufficiency (creatinine > 3.0 mg/dL or Glomerular Filtration Rate GFR \< 30) and/or renal replacement therapy at the time of screening
  6. Subjects with a history of bleeding diathesis or coagulopathy or patients in whom anti-platelet and/or anticoagulant therapy is contraindicated, patients who will refuse transfusion, or patients with an active peptic ulcer or history of upper gastrointestinal (GI) bleeding within the prior 3 months
  7. Subjects with known hypersensitivity or contraindication to aspirin, heparin/bivalirudin, clopidogrel/ticlopidine, nitinol, stainless steel alloy, and/or contrast sensitivity that cannot be adequately pre-medicated
  8. Subject is currently participating in another drug or device clinical study or has other medical illnesses that may cause the subject to be non-compliant with the protocol or confound the data interpretation
  9. Subjects with a previously implanted prosthetic aortic valve (i.e., planned valve-in-valve with a TAVI)
  10. Subject requires an emergent procedure
  11. Subject has active major psychiatric disease
  12. Subjects with neurodegenerative or other progressive neurological disease or history of significant head trauma followed by persistent neurologic defaults or known structural brain abnormalities
  13. Subject has an ejection fraction of 30% or less
  14. Subjects with active endocarditis or other systemic infection
  15. Subjects undergoing therapeutic thrombolysis
  16. Subject is pregnant or lactating. Pregnancy confirmed by positive urine or serum test

Computerized Tomographic exclusion criteria (preoperative screening)

  1. Subjects with documented friable or mobile atherosclerotic plaque in the aortic arch
  2. Subjects with echocardiographic evidence of aortic mass, thrombus or vegetation
  3. Subjects with a diameter of the ascending aorta \< 25 and > 39 mm at baseline CT (measured 10 mm upstream of the first vessel of the brachiocephalic trunk)
  4. Subjects undergoing transcatheter aortic valve implantation (TAVI) via the trans-axillary, trans-subclavian, or trans-aortic route
  5. Subjects with severe peripheral arterial, abdominal aortic, or thoracic aortic disease that precludes delivery of sheath vascular access
  6. Subjects in whom the aortic arch is heavily calcified, severely atheromatous, or severely tortuous
05

Study design

Phase
Not applicable
Primary purpose
Other
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrollment
100 participants (actual)

Study arms

  • Experimental
    TAVI + Embolic protection

    Subjects with severe native aortic valve stenosis who meet the clinically approved indications for aortic valve interventions such as TAVI

    Procedure: TAVI (Transcatheter Aortic Valve Implant) · Device: FLOWer Embolic Protection System

Interventions

  • ProcedureTAVI (Transcatheter Aortic Valve Implant)

    Placement of a filter to capture and remove emboli or debris detached during any transcatheter heart procedures

  • DeviceFLOWer Embolic Protection System

    FLOWer Embolic Protection System

    Also known as: transcatheter embolic protection for TAVI procedures

06

What researchers measure

Primary outcomes

  1. FLOWer Device Safety: Rate of Major Adverse Cardiac and Cerebrovascular Events

    Primary Safety Endpoint: FLOWer device Safety, rate of Major Adverse Cardiac and Cerebrovascular Events (MACCEs) related to FLOWer device and procedure as adjudicated by a Clinical Event Committee. MACCEs are based on the Valve Academic Research Consortium (VARC- 3) criteria: * all death; * all stroke (disabling and non-disabling); * acute kidney injury (stage 3 at discharge or 72 hours post index procedure, whichever occurs first)

    Time frame: 30 days

  2. Reduction in total volume of new cerebral lesions in all territories at serial DWMRI

    Primary Clinical Benefit Endpoint: Reduction in total volume of new cerebral lesions in all territories at serial DWMRI, compared to historical data in control arm (unprotected) data from previous randomized studies

    Time frame: Within 2-5 days after procedure vs. baseline

Secondary outcomes

  1. Cumulative occurrence of Serious Clinical Events related to FLOWer device and procedure as adjudicated by a Clinical Event Committee.

    Secondary Safety Endpoint: Cumulative occurrence of Serious Clinical Events related to FLOWer device and procedure as adjudicated by a Clinical Event Committee. all-cause mortality including cardiovascular mortality; * all stroke (disabling and non-disabling); * bleeding (life-threatening or disabling); * acute kidney injury (stage 3 at discharge or 72 hours post index procedure, whichever occurs first); * major device access related vascular complications; * coronary artery obstruction requiring intervention; * valve-related dysfunction requiring repeat procedure (balloon aortic valvuloplasty, repeat TAVI, or surgical aortic valve replacement).

    Time frame: 7 and 30 days

  2. Brain imaging (DW-MRI)

    Secondary Clinical Benefit Endpoints: Acute cerebral embolic burden reduction after TAVI, defined as number and volume of new cerebral lesions in all cerebral territories assessed by DW-MRI

    Time frame: Within 2-5 days after procedure vs. baseline

  3. Neurocognitive

    Secondary Clinical Benefit Endpoints: Neurocognitive protection assessed by NIHSS, Montreal Cognitive Assessment, and mRS

    Time frame: 2-7 days and 30-days vs. baseline

  4. Technical Success

    Secondary Performance Endpoints: Technical Success defined as successful placement, insertion and removal of the FLOWer System

    Time frame: Immediately after procedure

  5. Debris capture

    Secondary Performance Endpoints: Debris captured by the FLOWer System with gross and histopathological evaluation including particle size and composition

    Time frame: Immediately after procedure

  6. FLOWer System Usability

    Secondary Performance Endpoints: FLOWer System Usability graded by the Investigator with a 5-point Likert scale The minimum and the maximum values of the scale are defined as follows: (1) Unacceptable; (2) Poor; (3) Acceptable; (4) Good; (5) Excellent

    Time frame: Immediately after procedure

07

Study locations

8 sites
  • HartCentrum, Ziekenhuis Netwerk Antwerpen (ZNA) Middelheim
    Antwerp, 2020, Belgium
  • CUB Hôpital Erasme (ULB)
    Brussels, 1070, Belgium
  • Casa di Cura Policlinico di Monza
    Monza, MB 20900, Italy
  • IRCCS Ospedale San Raffaele
    Milan, MI 20132, Italy
  • IRCCS Policlinico San Donato
    San Donato Milanese, MI 20097, Italy
  • San Carlo Azienda Ospedaliera Regionale
    Potenza, PZ 85100, Italy
  • Centro Cardiologico Monzino IRCCS
    Milano, 20138, Italy
  • Clinica San Gaudenzio
    Novara, 28100, Italy
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References and documents

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Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Feb 23, 2024, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT04704258
Lead sponsor
AorticLab Srl
Collaborators
Meditrial Europe Ltd.
Responsible party
Sponsor
First posted
Jan 11, 2021
Start date
May 3, 2021
Primary completion
Jun 6, 2023
Completion
Jun 6, 2023
Last update
Feb 23, 2024

Study contacts

Franco Osta
study chair · AorticLab Srl

Oversight

Data monitoring committee
Yes
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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This study is completed, as verified in Feb 2024. You cannot join it, but the record below documents what was studied.

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