Miro3D Wound Matrix Study for Diabetic Foot Ulcers and Wound Healing

This prospective, randomized controlled trial evaluates the clinical effectiveness of Reprise Biomedical's Miro3D Wound Matrix in conjunction with standard of care (SOC) compared to SOC alone in treating Wagner Grade 1 diabetic foot ulcers (DFUs) in an outpatient setting. The investigational product, Miro3D, is a porcine liver-derived, acellular, three-dimensional extracellular matrix designed to support healing in complex wound environments by providing a biologically active scaffold that facilitates cell infiltration and tissue remodeling. This study aims to generate robust clinical evidence supporting Miro3D's role as an advanced biologic dressing for early and sustained wound healing in diabetic patients.

Background and Rationale: Diabetic foot ulcers are a common and serious complication of diabetes mellitus, affecting approximately 15-25% of individuals with diabetes over their lifetime. These ulcers are associated with high morbidity, increased healthcare utilization, and significant risk of lower extremity amputation. Despite established guidelines, many DFUs fail to heal adequately with standard of care alone, especially when early progress is not observed. According to consensus recommendations, wounds that do not demonstrate at least a 50% reduction in area within the first four weeks of SOC are unlikely to achieve closure by 12 weeks and are considered candidates for advanced wound therapies.

Advanced biologic matrices aim to address the limitations of SOC by enhancing the local wound environment. Miro3D is a perfusion-decellularized extracellular matrix derived from porcine liver, preserving native microvascular architecture and providing a highly porous scaffold for cellular infiltration. Unlike many sheet-based dermal matrices, Miro3D possesses significant three-dimensional structure and volume, making it suitable for filling shallow to moderately deep wound beds. The device is supplied sterile and dry, rehydrated at the point of care, trimmed to fit, and applied directly to the wound bed.

This study is designed to evaluate whether the addition of Miro3D to SOC accelerates healing and improves outcomes in Wagner Grade 1 DFUs, a common clinical presentation that often remains refractory to SOC alone. The trial also includes a crossover design for non-responders in the SOC arm, enhancing ethical treatment access while generating additional observational data.

Device Description and Mechanism of Action: Miro3D Wound Matrix is a sterile, acellular scaffold composed of porcine-derived extracellular matrix processed via perfusion decellularization to retain native liver architecture. The matrix is characterized by high porosity, preserved vascular pathways, and structural integrity, supporting rapid integration into the wound bed. Once rehydrated, Miro3D becomes pliable and conformable, suitable for application to irregular wound geometries.

Mechanistically, Miro3D provides a physical and biochemical scaffold that promotes cell adhesion, migration, angiogenesis, and granulation. As a non-crosslinked, resorbable collagen matrix, it undergoes host remodeling over time, integrating into newly formed tissue. The device can be trimmed to wound dimensions and applied weekly or biweekly depending on healing progression.

Study Objectives and Hypothesis: The primary objective of the study is to determine whether the application of Miro3D in combination with SOC leads to superior healing outcomes compared to SOC alone in the treatment of Wagner Grade 1 DFUs.

Primary Hypothesis: Miro3D + SOC will result in a significantly higher proportion of wounds achieving ≥50% area reduction and robust granulation tissue formation at 4 weeks, predictive of complete closure by 12 weeks.

Secondary Hypotheses: Subjects treated with Miro3D + SOC will demonstrate faster time to healing, improved patient-reported quality of life (QOL), reduced pain, and comparable or improved safety compared to those receiving SOC alone.

Study Design and Randomization: This is a randomized controlled trial enrolling approximately 30 subjects (15 per arm). Subjects meeting eligibility criteria will be randomized in a 1:1 ratio to either:

1. Intervention Arm (Miro3D + SOC): Weekly Miro3D application for the first four weeks, followed by biweekly application if the wound remains unhealed, for up to 12 weeks.

2. Control Arm (SOC alone): Standard wound care practices without Miro3D. Subjects with unhealed wounds at 12 weeks are eligible to cross over to receive Miro3D under the same application schedule for an additional 12-week observational phase.

Randomization will use sealed envelope assignment to ensure unbiased group assignment.

Visit Schedule and Study Assessments:

1. Screening Visit (Week -2 to 0):

   • Informed consent

   • Wound debridement and imaging

   • Vascular assessment

   • HbA1c testing, pregnancy test if applicable

   • Run-in period

2. Randomization Visit (Week 0):

   • Confirm eligibility

   • Randomization

   • Baseline wound measurements and photos

   • QOL and pain scale assessments

   • First application of Miro3D (intervention arm)

3. Weekly Treatment Visits (Weeks 1-11):

   • Wound imaging and measurements

   • Clinical assessment and re-debridement as needed

   • Miro3D reapplication (as indicated)

   • Pain assessment and adverse event tracking

4. End-of-Treatment Visit (Week 12):

   • Final wound assessment

   • Confirmation of wound closure

   • Final QOL and pain scale assessments

   • Eligibility for crossover (control arm, if unhealed)

5. Crossover Phase (Weeks 13-24, as needed):

   • Subjects from SOC arm receive Miro3D + SOC

   • Follow-up per the intervention arm protocol

6. Closure Confirmation Visits (2 and 4 weeks post-closure):

   • Validation of sustained healing

Crossover Design and Follow-Up: Subjects in the SOC arm who do not achieve complete healing by Week 12 are eligible to cross over to receive Miro3D under the same application schedule. The crossover phase is observational and not included in the primary efficacy analysis. These data will help characterize Miro3D's performance as a rescue therapy in chronic wounds unresponsive to SOC.

Subjects who achieve healing during the randomized phase or crossover phase will undergo 2- and 4-week confirmation visits to validate sustained closure.

Safety Monitoring and Adverse Event Reporting: All adverse events will be documented, assessed for severity and relatedness, and reported per FDA and IRB requirements. Investigators will monitor subjects for infection, delayed healing, inflammatory reactions, and systemic complications. Device-related events will be tracked by lot number.

Unanticipated adverse device effects (UADEs), if any, will be escalated to the sponsor and appropriate regulatory bodies. Based on previous clinical use of hepatic-derived ECM scaffolds, Miro3D is expected to demonstrate a favorable safety profile.

Regulatory, Ethical, and Clinical Context: Miro3D Wound Matrix is FDA-cleared under 510(k) as a Class II medical device (K223257) for use in managing partial- and full-thickness wounds. This trial is conducted as a post-market, investigator-initiated study in accordance with Good Clinical Practice (GCP), IRB approval, and informed consent regulations under 21 CFR Part 50.

The trial addresses a critical gap in clinical evidence by comparing Miro3D to SOC in a randomized, controlled framework. Few biologic wound matrices have RCT-level data supporting early use in Wagner Grade 1 DFUs. The findings will inform clinical guidelines, payer coverage decisions, and the design of larger-scale trials aimed at improving outcomes for patients with chronic diabetic wounds.