Comparative Study of Embolic Agents in Patients With Subdural Hemorrhage Undergoing Middle Meningeal Artery (MMA) Embolization

August 5, 2026 updated by: Sanford Health
Single site, prospective, comparative effectiveness pilot trial comparing efficacy and safety outcomes of three embolic materials (particles, liquid embolics, and Wallaby Phenox coils) in MMA embolication for cSDH.

Study Overview

Status

Not yet recruiting

Conditions

Intervention / Treatment

Detailed Description

Participants will be sequentially enrolled into one of three treatment arms based on the embolic material used during their MMA embolization:

Cohort/Arm 1: Particles (polyvinyl alcohol or similar microspheres) Cohort/Arm 2: Liquid embolics (Onyx, n-BCA, or equivalent) Cohort/Arm 3: Phenox coils (Avenir UNO Helical Coil) Participants will remain on study through their standard 30- and 90-day follow-up visits.

With a target of 30 patients (10 per arm), the study will provide preliminary data on radiographic efficacy (primary: hematoma resolution/thickness reduction), safety (complications, recurrence, adverse events, reinterventions), and exploratory outcomes (symptom/functional improvement, procedural metrics, influence of comorbidities/antithrombotics).

Study Type

Interventional

Enrollment (Estimated)

30

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Locations

  • United States
    • South Dakota
      • Sioux Falls, South Dakota, United States, 57105
        • Sanford USD Medical Center

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Adult patients (≥ 18 years)
  • Undergoing Middle Meningeal Artery Embolization (MMAE) for chronic subdural hematoma (cSDH)
  • Able to provide informed consent or have a legally authorized representative (LAR) do so

Exclusion Criteria:

  • Ineligible for MMAE procedure, as deemed by the treating physician, for any indication (e.g. pregnancy)
  • Non-chronic subdural hematoma (cSDH) indications for Middle Meningeal Artery Embolization (MMAE), including acute subdural hematoma with symptom onset < 72 hours or mixed acute/chronic without predominant chronic features
  • Pregnancy or breastfeeding
  • Known severe allergy or contraindication to embolic materials (e.g. particles, liquids like Onyx/n-BCA, or coils)
  • Inability to undergo angiography (e.g. severe renal impairment contraindicating contrast)
  • Inability or unwillingness to complete follow-up visits at 30 and 90 days

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: MMA Embolization
Participants will be sequentially assigned one of three MMAE treatment strategies (particles, liquid embolics, or coils) in the order they become eligible and agree to participate. Radiographic and clinical outcomes will be compared.
Device: Particles (polyvinyl alcohol or similar microspheres)
Participants will be sequentially enrolled into one of three clinically accepted MMAE treatment strategies (interventions) to compare radiographic and clinical outcomes.
Device: Liquid Embolics (Onyx, n-BCA, or equivalent)
Participants will be sequentially enrolled into one of three clinically accepted MMAE treatment strategies (interventions) to compare radiographic and clinical outcomes.
Device: Phenox Coils (Avenir UNO Helical Coil)
Participants will be sequentially enrolled into one of three clinically accepted MMAE treatment strategies (interventions) to compare radiographic and clinical outcomes.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Change in hematoma size
Time Frame: Baseline, 90 days
The primary objective aims to compare the radiographic efficacy of three embolic materials (particles, liquid embolics, Phenox coils) in MMA embolization for cSDH to evaluate change in hematoma size.
Baseline, 90 days

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Complications
Time Frame: Baseline, 90 days
The secondary objectives aim to evaluate the safety profile of the embolic materials, to support overall comparative effectiveness.
Baseline, 90 days
Recurrence Rates
Time Frame: Baseline, 90 days
The secondary objectives aim to evaluate the the safety profile of the embolic materials, to support overall comparative effectiveness.
Baseline, 90 days
Adverse Events
Time Frame: Baseline, 90 days
The secondary objectives aim to evaluate the the safety profile of the embolic materials, to support overall comparative effectiveness.
Baseline, 90 days
Re-Intervention Rates
Time Frame: Baseline, 90 days
The secondary objectives aim to evaluate the the safety profile of the embolic materials, to support overall comparative effectiveness.
Baseline, 90 days

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sanford Health

Collaborators

phenox Inc.

Investigators

  • Principal Investigator: Divyajot Sandhu, MD, MBBS, Sanford Health

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

September 1, 2026

Primary Completion (Estimated)

September 1, 2027

Study Completion (Estimated)

March 1, 2028

Study Registration Dates

First Submitted

July 31, 2026

First Submitted That Met QC Criteria

August 5, 2026

First Posted (Actual)

August 11, 2026

Study Record Updates

Last Update Posted (Actual)

August 11, 2026

Last Update Submitted That Met QC Criteria

August 5, 2026

Last Verified

July 1, 2026

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • SH-PHENOX-COILS-MMA-EMBOLICS

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

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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