Envi™-SR Randomized Controlled Trial for Endovascular Treatment of Ischemic Stroke (ENVI RCT)

The study objective is to examine and compare clinical outcomes, as measured by Modified Rankin Scale (mRS) at 90 days (± 15 days) post treatment, and related performance characteristics of the Envi™-SR and concurrent parallel Control Devices currently cleared by the U.S. FDA for treatment of stroke.

Study Overview

• Status: Terminated
• Conditions: Acute Ischemic Stroke
• Intervention / Treatment: Device: Mechanical Thrombectomy using the Envi™-SR Thrombectomy device; Device: Mechanical Thrombectomy using the Solitaire or Trevo Revascularization Device

Detailed Description

This study intends to evaluate a novel mechanical thrombectomy device to treat patients suffering from acute ischemic stroke through a prospective, randomized pivotal study to provide an assessment of the safety and non-inferiority of the device.

• Study Type: Interventional
• Enrollment (Actual): 12
• Phase: Not Applicable

Contacts and Locations

Study Locations

• United States
  • California
    • Irvine, California, United States, 92612
      • Providence Medical Foundation
  • Florida
    • Jacksonville, Florida, United States, 32207
      • Baptist Health Research Institute
  • Illinois
    • Downers Grove, Illinois, United States, 60068
      • Advocate Aurora Health
  • New York
    • Manhasset, New York, United States, 11030
      • North Shore University Hospital

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria

1. Clinical signs consistent with acute ischemic stroke
2. Pre-stroke Modified Rankin Score ≤ 2
3. Age 18 years and no upper limit (patient must be 18 years old at time of consent).
4. NIHSS ≥ 6 at the time of randomization
5. Subject is able to start treatment (defined as time of arterial puncture) within 24 hours of stroke onset or last known well and within 90 minutes from last baseline CT/ MRI.

6. Imaging: For strokes in the anterior circulation the following imaging criteria should also be met:

   1. If stroke onset (as defined by the time the patient was last seen at baseline) is within 6 hours: Baseline ASPECTS ≥6 on non-contrast CT (NCCT) or DWI-MRI;
   2. If stroke onset is within 6-24 hours, advanced imaging with either CT perfusion or DWI-MRI is required. Baseline infarct volume must be ≤50cc for patients under 80 years old and ≤20cc for patients 80 years or older.
7. Location: Angiographic confirmation of an occlusion of an ICA (including T or L occlusions), M1 or M2 MCA, with eTICI flow of zero (0) - one (1).
8. Patients for whom IV t-PA is indicated are treated with IV t-PA without delay.
9. IV t-PA, if used, is initiated within three (3) hours of stroke onset (onset time is defined as the last time when the patient was witnessed to be at baseline), with investigator verification that the subject has received/is receiving the correct IV t-PA dose for the estimated weight.
10. Consent: The patient or the patient's legally authorized representative (LAR) has signed and dated an Informed Consent Form.
11. Will comply with protocol follow-up schedule.
12. Patient was ambulatory prior to stroke, i.e. able to walk without another person's assistance.

Exclusion Criteria

1. Life expectancy likely less than six (6) months.
2. Females who are pregnant or breastfeeding.
3. Known history of severe allergy (more than rash) to contrast medium that cannot be medically controlled.
4. Suspicion of renal failure (Renal failure as defined by a serum creatinine >3.0 mg/dL (264 μmol/L) or Glomerular Filtration Rate (eGFR) <30).
5. Severe, sustained hypertension (Systolic Blood Pressure >185 mmHg or Diastolic Blood Pressure >110 mmHg) NOTE: If the blood pressure can be successfully reduced and maintained at the acceptable level using medication the subject can be enrolled.
6. Currently participating in another interventional (drug, device, etc.) research project that may confound the results of this study.
7. Known hereditary or acquired hemorrhagic diathesis, coagulation factor deficiency. (A subject without history or suspicion of coagulopathy does not require INR or prothrombin time lab results to be available prior to enrollment.)
8. Known history of platelet count <100,000/μL.
9. Baseline blood glucose of <50mg/dL (2.78 mmol) or >400mg/dL (22.20 mmol).
10. Subjects with occlusions in multiple vascular territories (e.g., bilateral anterior circulation, or anterior/posterior circulation).
11. CT or MR evidence of hemorrhage.
12. Seizures at stroke onset.
13. Suspicion of aortic dissection.
14. Patients with known hypersensitivity to nickel-titanium.
15. Evidence of dissection in the extra or intracranial cerebral arteries.
16. Stenosis, or any occlusion, in a proximal vessel that requires treatment or prevents access to the site of occlusion.
17. Presumed septic embolus, suspicion of bacterial endocarditis, or other serious infection.
18. Suspected cerebral vasculitis based on medical history and CTA/Magnetic Resonance Angiogram (MRA).
19. Excessive vascular access tortuosity that will likely prevent endovascular access.
20. Baseline CT or Magnetic Resonance Imaging (MRI) showing intracranial tumor (except asymptomatic small meningiomas less than three (3) cm).
21. Significant mass effect with midline shift
22. Treatment with any cleared thrombectomy devices or other intra-arterial (neurovascular) therapies three months prior to use of treatment device
23. Unlikely to be available for 90-day (± 15 days) follow-up (e.g. no fixed home address, visitor from overseas).
24. Rapid neurological improvement prior to study enrollment suggesting resolution of signs/symptoms of stroke such as a decrease that leads to an NIHSS below the study cut-off of six (6).
25. Patient has suffered a hemorrhagic or ischemic stroke or TIA in at least the last three (3) months.
26. Patients with a pre-existing neurological or psychiatric disease that would confound the neurological or functional evaluations, mRS score at baseline must be ≤ 2. This excludes patients who are severely demented, require constant assistance in a nursing home type setting or who live at home but are not fully independent in activities of daily living (toileting, dressing, eating, cooking and preparing meals, etc.).
27. Known cancer with metastases.
28. Subject currently uses or has a recent history of illicit drug(s), which includes marijuana.
29. Recent past history (within three (3) months) or clinical presentation of intracranial hemorrhage (ICH), subarachnoid hemorrhage (SAH), ruptured arteriovenous malformation (AVM) or ruptured aneurysm.
30. The patient is in a coma.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Single

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Envi™-SR Thrombectomy Device; Mechanical Thrombectomy using the Envi™-SR Thrombectomy Device	Device: Mechanical Thrombectomy using the Envi™-SR Thrombectomy device; Clot removal using the Envi™-SR Thrombectomy device
Active Comparator: Solitaire or Trevo Revascularization Device; Mechanical Thrombectomy using the Solitaire or Trevo Revascularization Device	Device: Mechanical Thrombectomy using the Solitaire or Trevo Revascularization Device; Clot removal using the Solitaire or Trevo Revascularization Device

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Primary Effectiveness Endpoint: Proportion of Subjects With Good Clinical Outcome Defined as Modified Rankin Score (mRS) of ≤2	The proportion of subjects with good clinical outcome defined as Modified Rankin Score (mRS) of ≤2 as assessed by a blinded assessor at 90 days (±15 days)	90 days
Primary Safety Endpoint: Device-related or Procedure-related Symptomatic Intracranial Hemorrhage (sICH)	Device-related or procedure-related symptomatic intracranial hemorrhage (sICH) defined by the Heidelberg Bleeding Classification at 24 hours (-8/+12 hours) (as read by the Core Lab and adjudicated by Clinical Events Committee (CEC)).	24 hours

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Secondary Effectiveness Endpoint: Proportion of Subjects With Early Response (NIHSS)	Early Response is defined as a decrease of ≥10 points in NIHSS from baseline or NIHSS score of 0 or 1 at 7 days (-2/+3 days) or discharge, whichever occurs first.	7 days (-2/+3 days) or discharge
Secondary Effectiveness Endpoint: Proportion of Subjects Who Achieve Successful Reperfusion Measured Using eTICI	Successful reperfusion is defined as achieving an expanded Thrombolysis in Cerebrovascular Infarction (eTICI) score of 2b50 or greater in the target vessel following three or less passes of the randomized device.	Procedure through final angiographic assessment
Secondary Effectiveness Endpoint: Proportion of Subjects Achieving First Pass Effect (FPE)	First Pass Effect (FPE) is defined as achieving an expanded Thrombolysis in Cerebrovascular Infarction (eTICI) score of 2c or greater following a single pass of the randomized device.	Procedure through final angiographic assessment

Collaborators and Investigators

• Sponsor: NeuroVasc Technologies
• Investigators: Principal Investigator: Vitor Mendes-Pereira, MD, MSc, St Michael's Hospital and the University of Toronto; Principal Investigator: Raul G Nogueira, MD, University of Pittsburgh Medical Center

Study record dates

Study Major Dates

• Study Start (Actual): June 23, 2022
• Primary Completion (Actual): May 18, 2023
• Study Completion (Actual): January 27, 2025

Study Registration Dates

• First Submitted: October 21, 2021
• First Submitted That Met QC Criteria: October 25, 2021
• First Posted (Actual): November 4, 2021

Study Record Updates

• Last Update Posted (Actual): April 27, 2026
• Last Update Submitted That Met QC Criteria: April 6, 2026
• Last Verified: April 1, 2026

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Cerebrovascular Disorders; Brain Diseases; Central Nervous System Diseases; Nervous System Diseases; Vascular Diseases; Cardiovascular Diseases; Stroke; Ischemic Stroke
• Other Study ID Numbers: CL-001

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: Yes
• product manufactured in and exported from the U.S.: No