Topical Collagen Powder for Healing of Acute Full-thickness Wounds

Each patient received a single 4mm punch biopsy on each anterior thigh to provide for internalized controls. One wound was managed with PC, while the other was treated with daily topical collagen powder for up to four weeks. Prior to each biopsy, the areas were cleansed with an alcohol swab and anesthetized using 1 mL of 2% lidocaine with epinephrine. An Integra Miltex 4.0 mm Standard Biopsy Punch instrument was used to create full-thickness wounds and pressure was applied with gauze until hemostasis occurred.

Up to one gram of topical type 1, 100% bovine collagen powder (NuvagenTM, CPN Biosciences, Inc., Largo, FL) was placed on one wound before covering it with a non-adherent sterile dressing. The other wound underwent PC with two epidermal sutures (Ethilon Nylon Sutures, Ethicon, Somerville, NJ) and was similarly covered with a sterile dressing. At the four week follow-up, wounds were re-biopsied following the same procedures.

For home treatment, patients were provided with collagen powder in one-gram containers and dressings along with the following instructions: 1) Irrigate the wound with tap water or saline solution, 2) Dry the wound with gently with dry gauze, 3) Apply up to one gram of collagen powder to the wound, and 4) Apply a sterile dressing. Assistance from a caregiver was permitted as needed. This procedure was repeated daily for four weeks after the first biopsy and until wound closure after the second biopsy. For wounds closed primarily, patients were instructed to apply petroleum jelly before covering the wounds with sterile dressings.

Inclusion criteria

• Outpatient, male or female subjects of any race, 18-75 years of age
• Able to understand the requirements of the study and understand and sign Informed Consent/HIPAA Authorization forms
• Patients willing to refrain from using topical medications to punch biopsy sites
• Patients who are willing to follow protocol instructions and return for follow-up visits

Exclusion criteria

• Patients that have any medical or skin condition that could impair wound healing
• Patients that have used systemic medications that suppress the immune system within 5 half-lives (if known), or 2 months of enrollment (i.e. corticosteroids)
• Patients that have applied topical steroids to the thigh(s) in the 2 weeks prior to enrollment
• Patients that are currently participating in an investigational study of a drug or device or have participated within 4 weeks of enrollment
• Patients that in the opinion of the investigator demonstrate evidence of unwillingness or inability to follow instructions or to complete the study
• Patients currently using systemic antimicrobials
• Patients with a history of diabetes mellitus
• Patients with a history of bleeding disorders or concomitant treatment with aspirin or anticoagulants (including heparin, low molecular weight heparin, warfarin, fondaparinux, or rivaroxaban)
• Patients with a history of keloids or hypertrophic scars
• Patients with other conditions considered by the investigator to be reasons for disqualification that may jeopardize subject safety or interfere with the objectives of the trial (e.g., acute illness or exacerbation of chronic illness)
• Patients with a known allergy or sensitivity to any component of the test medication (including bovine and/or collagen products) or local anesthetic agent used
• Current or previous users of tobacco products
• Recent alcohol or drug abuse is evident
• Pregnant females or nursing mothers. Eligible women of reproductive age will be required to have a negative urine pregnancy test at screening. They will also be required to be on at least 1 reliable form of effective birth control [examples: barrier method (condoms, diaphragm), oral, injectable, implant birth control or abstinence] during the course of this study and 30 days following the last treatment period.