Gravity Stent-Retriever System For Reperfusion Of Large Vessel Occlusion Stroke Trial

Stroke Clinical Trial

— GRASSROOT  

Official title:

Gravity Stent-Retriever System For Reperfusion Of Large Vessel Occlusion Stroke Trial (GRASSROOT)

Clinical Trial Details — Status: Recruiting

Administrative data

• NCT number: NCT06249776
• Other study ID #: GMT-GRASSROOT-24-01
• Status: Recruiting
• Phase: N/A
• Start date: February 9, 2024
• Est. completion date: December 30, 2026

Study information

• Verified date: February 2024
• Source: Gravity Medical Technology, INC
• Contact: Shashvat M Desai, MD
• Phone: 4122188258
• Email: shashvat.desai[@]gravitymedtech.com
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

The study aims to evaluate the safety and efficacy of the Supernova stent retriever device, developed by Gravity Medical Technology, for treating acute ischemic stroke. The device is used to remove blood clots and restore blood flow to the brain .

Recruitment information / eligibility

• Status: Recruiting
• Enrollment: 100
• Est. completion date: December 30, 2026
• Est. primary completion date: March 30, 2026
• Accepts healthy volunteers: No
• Gender: All
• Age group: 18 Years to 85 Years

Eligibility

Inclusion Criteria:

• New focal neurologic deficit consistent with being of acute cerebral ischemia origin
• Age 18-85 years old (inclusive)
• Interventionalists estimate that treatment with the Supernova (first deployment in target vessel) can be achieved within 24 hours of symptom onset
• The patient either: a) eligible for and received IV t-PA within 3 hours of symptom onset, at the correct 0.9 mg/kg dose, or b) ineligible for IV t-PA
• Admission NIH Stroke Scale score of 8-25
• No known significant pre-stroke disability (pre-stroke mRS 0 or 1)
• Catheter angiographic confirmation of large vessel occlusion in the intracranial internal carotid artery, the M1 or M2 segments of the middle cerebral artery, or the basilar artery that is accessible to the Supernova device
• For strokes in the anterior circulation, the following imaging criteria should also be

met:

1. MRI criterion: volume of diffusion restriction visually assessed =50 mL, OR

2. CT criterion: ASPECTS 6 to 10 on baseline NCCT

• Anticipated life expectancy of at least 6 months
• A signed informed consent by the patient or a Legally Authorized Representative or independent physician in case of oral consent

Exclusion Criteria:

• Subject already participating in another study of an investigational treatment device or treatment
• Use any other intra-arterial recanalization drug or device prior to the use of Supernova (Supernova is not the first-choice device)
• Angiographically evident excessive arterial tortuosity precluding device access to the thrombus
• For all patients, severe sustained hypertension with SBP >220 and/or DBP >120; for patients treated with IV tPA, sustained hypertension despite treatment with SBP >185 and/or DBP > 110
• Glucose < 50 mg/dl (2.78 mmol/L) or > 400 mg/dl (22.20 mmol/L).
• Known hemorrhagic diathesis
• Coagulation factor deficiency or oral anti-coagulant therapy with an international normalized ratio (INR) of more than 3.0
• Treatment with heparin within 48 h with a partial thromboplastin time more than two times the laboratory normal
• Patients who have received a direct thrombin inhibitor within the last 48 hours; must have a partial thromboplastin time (PTT) less than 1.5 times the normal to be eligible.
• Platelet count of less than 50,000/ µL
• History of severe allergy to contrast medium, nickel, or Nitinol.
• Intracranial hemorrhage
• Significant mass effect with midline shift
• Intracranial tumor (apart from small meningioma, = 2 cm in diameter)
• Stenosis or any occlusion in the deployment site or in a proximal vessel requiring treatment or preventing device access to the thrombus (for example, stenosis or occlusion in the cervical internal carotid artery or common carotid artery)
• Presence of intracranial atherosclerotic disease requiring rescue therapy (for example, intracranial stenting)
• Females who are pregnant or breastfeeding
• Known current use of narcotic drugs at the time of treatment
• Prior recent stroke in the past 3 months
• Renal failure with serum creatinine >3.0 or Glomerular Filtration Rate (GFR) <30.
• Known cerebral vasculitis
• Rapidly improving neurological status defined as the improvement of greater than 8 points on the NIHSS or improvement to NIHSS of < 6 prior to the procedure
• Clinical symptoms are suggestive of bilateral stroke or stroke in multiple territories.
• Ongoing seizure due to stroke
• Evidence of active systemic infection
• Known cancer with metastases
• Suspicion of aortic dissection, septic embolus, or bacterial endocarditis
• Evidence of dissection in the extra or intracranial cerebral arteries
• Occlusions in multiple vascular territories (e.g., bilateral anterior circulation or anterior/posterior circulation)
• Aneurysm in the target vessel

Related Conditions & MeSH terms

• Brain Diseases
• Cardiovascular Diseases
• Central Nervous System Diseases
• Cerebrovascular Disorders
• Ischemic Stroke
• Nervous System Diseases
• Stroke
• Vascular Diseases

Intervention

Device:
• Supernova revascularization device
Mechanical Thrombectomy

Locations

Country	Name	City	State
India	All India Institute of Medical Sciences, New Delhi	New Delhi	Delhi
Pakistan	National Institute of Cardiovascular Diseases	Karachi	Sindh

Sponsors (1)

Lead Sponsor	Collaborator
Gravity Medical Technology, INC

Countries where clinical trial is conducted

India,  Pakistan, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Successful reperfusion	Rate of successful reperfusion, defined as modified Thrombolysis in Cerebral Ischemia (mTICI) grade of 2b or higher; Grade 0: No reperfusion Grade 3: Complete reperfusion	Day 0 (end of procedure)
Primary	Symptomatic intracranial hemorrhage	Safety (Rate of symptomatic intracranial hemorrhage (sICH) as measured by the SITS-MOST criteria) The SITS-MOST definition of SICH is a local or remote type II parenchymal haemorrhage within 22 to 36 hours after treatment (or sooner) associated with a = fourpoint deterioration on the NIHSS score from baseline or from the lowest score from baseline to 24 hours, or leading to death.	sICH measured within 24 (18-36) hours of the study procedure
Primary	All-cause mortality	Safety (All-cause mortality)	All-cause mortality measured at 90 (±14) days
Secondary	Percentage of participants with a modified Rankin Scale (mRS) score of =2	Effectiveness; (The modified Rankin Scale (mRS) is a commonly used scale for measuring the degree of disability or dependence in the daily activities of people who have suffered a stroke or other causes of neurological disability. The scale runs from 0-6 with "0" being perfect health without symptoms to "6" being death.; Score 0: No symptoms Score 1: No significant disability. Able to carry out all usual activities, despite some symptoms.; Score 2: Slight disability. Able to look after own affairs without assistance, but unable to carry out all previous activities.; Score 3: Moderate disability. Requires some help, but able to walk unassisted. Score 4: Moderately severe disability. Unable to attend to own bodily needs without assistance, and unable to walk unassisted.; Score 5: Severe disability. Requires constant nursing care and attention, bedridden, incontinent.; Score 6: Dead)	90 (±14) days post-treatment
Secondary	Successful Reperfusion at First Pass	Effectiveness (Successful reperfusion defined as mTICI 2b or better at first pass)	Assessed at first pass of the intervention during the procedure
Secondary	Asymptomatic Intracranial Hemorrhage	Safety (Incidence of any asymptomatic intracranial hemorrhage post-procedure)	Day 1 (within 24 hours (18-36 hours) of the procedure)
Secondary	Neurological Deterioration	Safety (defined as a =4-point increase in the National Institutes of Health Stroke Scale (NIHSS) score)	Day 1 (within 24 hours (18-36 hours) of the procedure)