WOLF - Feasibility Neurothrombectomy Study in Acute Ischemic Stroke Patients

Acute Ischemic Stroke Clinical Trial

— WOLF  

Official title:

WOLF - Prospective Feasibility Clinical Investigation to Evaluate the Safety and Technical Performance of the WOLF Thrombectomy Device in Acute Ischemic Stroke Patients

Clinical Trial Details — Status: Withdrawn

Administrative data

• NCT number: NCT03781622
• Other study ID #: CLIN 0001-CAN
• Status: Withdrawn
• Phase: N/A
• Start date: June 13, 2019
• Est. completion date: December 30, 2019

Study information

• Verified date: January 2020
• Source: 880 Medical, LLC
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

This study is being conducted as a feasibility clinical investigation to collect safety and technical performance data of the WOLF Thrombectomy Device for the removal of thrombus in the neurovasculature.

Description:

This study has been designed as a prospective, non-randomized, multi-center, feasibility clinical investigation to evaluate the safety and device technical performance of the WOLF Thrombectomy Device in removing thrombus from an occluded large intracranial vessel(s) in patients with acute ischemic stroke. The device may be used alone or as an adjunct to intravenous tissue plasminogen activator (tPA) and/or to other traditional, thrombectomy modalities.

Recruitment information / eligibility

• Status: Withdrawn
• Enrollment: 0
• Est. completion date: December 30, 2019
• Est. primary completion date: December 30, 2019
• Accepts healthy volunteers: No
• Gender: All
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

1. Male or female subjects age =18 years (no upper limit).

2. NIHSS > 6 at the time of baseline neuro imaging.

3. Endovascular treatment intended to be initiated within 60 minutes of qualifying neuroimaging and intended vessel recanalization within 90 minutes of qualifying neuroimaging.

4. Stroke symptom onset within 24hrs of when groin puncture can be obtained.

5. Anterior and posterior circulation large vessel occlusion as confirmed through neuro imaging (CT/CTA/mCTA/MRI/MRA).

6. Neurovascular imaging (CTA/mCTA and or MRA) must include the aortic arch, cervical vessels and intracranial circulation.

7. Advanced neurovascular imaging is required for patients when groin puncture can be obtained after 6 hours and before 24 hours (multiphase CTA, CT Perfusion or perfusion diffusion imaging).

8. The occlusion is located in a proximal intracranial artery (carotid artery, M1 segment of the MCA, or proximal M2 divisions) of the anterior circulation for patients after 6 hours and before 24 hours.

9. There is imaging and clinical evidence of small core and large areas at risk, defined in the previous trials (DAWN & DEFUSE 3) as either:

i. NIHSS =10 and either 0-21 ml core infarct (=80 years old) or 0-31 ml core infarct (<80 years old), or NIHSS=20 and 31 to <51ml core infarct and <80 years old (DAWN trial criteria).

OR ii. Ischemic core volume is < 70 ml, mismatch ratio is >/= 1.8 and mismatch volume* is >/= 15 ml (DEFUSE 3 trial criteria).

10. Pre-stroke disability limited to patients with mRS = 2.

11. Written informed consent to participate given by subject or legal / authorized representative per local ethics committee requirements.

Exclusion Criteria:

1. Female subject is known to be pregnant.

2. Absence of large vessel occlusion on neuro imaging.

3. Presence of existing or preexisting large vessel infarction.

4. Angiographic evidence of excessive arterial tortuosity or access that precludes the WOLF device from reaching the thrombus.

5. Known hemorrhagic diathesis, coagulation factor deficiency, or oral anticoagulant therapy with INR >2.5.

6. Patient has a known hypersensitivity to contrast media.

7. Medical reasons the procedure cannot be performed (i.e. patient is experiencing active, uncontrolled bleeding, etc.)

8. Subject is known to be currently enrolled in another investigational trial that could interfere with the endpoint analysis of this trial.

9. ASPECT < 5 or > 1/3 MCA vascular territory compromised as evidenced by CT or MRI.

10. Significant mass effect and mid-line shift.

11. Any evidence of intracranial hemorrhage on imaging.

12. For posterior circulation large vessel occlusion evidence of completed significant brain stem infarction.

13. Posterior circulation after 6 hours.

14. Patients are known to have severe psychiatric disorders, substance abuse, or other reason for being unable to follow trial follow-up instructions.

15. Subject has a known significant concomitant illness with a life expectancy of <6 months.

16. Subject has a known allergy to nickel.

17. Subject has a known history of severe intracranial atherosclerotic disease (ICAD).

18. Subject is unlikely to be able and willing to comply with site standard medical follow up to 90 days.

Related Conditions & MeSH terms

• Acute Ischemic Stroke
• Cerebral Infarction
• Ischemia
• Stroke

Intervention

Device:
• WOLF Thrombectomy Device
Mechanical thrombectomy for the neurovasculature

Locations

Country	Name	City	State
Canada	Hamilton General Hospital	Hamilton	Ontario
Canada	Royal University Hospital	Saskatoon	Saskatchewan

Sponsors (1)

Lead Sponsor	Collaborator
880 Medical, LLC

Country where clinical trial is conducted

Canada, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Primary Technical Success Endpoint	Technical Success defined as the ability to achieve a revascularization rate (Thrombolysis in cerebral infarction [TICI] 2b/3) of =50% with the first pass of the WOLF Thrombectomy device. Revascularization is assessed by the investigator using fluoroscopy and after the first pass of the device is assessed using the TICI scale. Additional passes will be performed as necessary and the total number of attempts to achieve revascularization documented.	At index procedure
Primary	Primary Safety Endpoint	WOLF device-related adverse events (incidence, relationship to device and severity) at index procedure and through 24 hours post procedure.	At index procedure and through 24 hours post procedure.