non-healing venous leg ulcers treated with standard care with or without br-ac

Conditions: Non-infected Venous Leg Ulcer; Venous Leg Ulcer; Venous Insufficiency; Venous Stasis; Venous Reflux

Summary: this study examines a patient population with a non-healing, non-infected venous leg ulcer (vlu) having adequate arterial perfusion with confirmed venous reflux. it is hypothesized that weekly applications of the human placental allograft bioretain® amnion chorion (br-ac) applied to a non-healing vlu will result in a higher proportion of wounds showing complete healing within 12 weeks of initiating therapy, compared to standard care alone. this study has a crossover period, where subjects on standard care alone who do not achieve complete healing within 12 weeks of initiating therapy will be allowed to crossover to receive br-ac over 12 additional weeks, to evaluate if their wound can achieve complete healing.

this trial is a multicenter, randomized, controlled study designed to evaluate the safety and efficacy of br-ac plus standard of care versus standard of care only in the treatment of venous leg ulcers. the eligibility criteria for this study will allow for enrollment of subjects with a vlu in the range of 2 cm\^2 to 20 cm\^2 in area. a lower size of 2 cm\^2 was selected to exclude subjects who are likely to heal under compression therapy alone. during the two-week run-in period, subjects who show a reduction in wound area predictive of achieving complete wound closure within 12 weeks under standardized care alone (i.e., compression therapy) will be excluded from the study. eliminating these subjects will improve the estimated treatment effect. the criteria for duration, ≥ 4 weeks but ≤ 52 weeks, allows for the selection of those wounds that have demonstrated chronicity but may still have the potential to achieve wound closure. the trial design will control potential variables that may affect the outcome between the treatment group and the control group by standardizing the requirements for evaluating venous insufficiency confirmed by duplex doppler ultrasound examining valvular or venous incompetence, debridement, and compression therapy. weekly subject visits will help monitor compliance in wound care and compression therapy, as well as to document when wound closureis achieved. the study will implement the use of an electronic imaging and measurement device (ekare insight®) using a standardized protocol to ensure the measuring of the wound surface area is accurate, highly reproducible, and minimally variable. there will also be a crossover treatment phase for those patients that were relegated to soc only. after their 12-week standard of care treatment phase and for only those subjects that did not achieve complete wound closure, will be allowed to crossover for an additional 12 weeks of treatment with the br-ac product following the protocol and procedures set forth within this document. a follow-up phase will commence for all subjects that achieve complete wound closure, which is designed to measure longevity and durability of the closed wound. this follow-up period will consist of a four-week follow-up with two visits at each two-week interval.

Eligibility criteria:
inclusion criteria: 1. patient has signed the informed consent form. 2. male or female patient at least 18 years of age or older, as of the date of the screening visit. 3. has a vlu between the knee and ankle (at or above the malleoli), with a surface area in the range of ≥ 2.0 cm2 and ≤ 20.0 cm2 when measured by the investigator staff at the screening visit using the ekare device post debridement. 1. if the subject presents with \> 1, but ≤ 3 vlu on the same leg, the largest ulcer will be selected as the target ulcer. 2. if the target ulcer is \< 1cm from another vlu, the ulcers should be traced as a single target ulcer provided at least one of the ulcers is at least 2.0 cm2 in area and the total surface area of the vlus is ≤ 20.0 cm2. 4. target ulcer involves a full-thickness skin loss, but without exposure of tendon, muscle, or bone. 5. target ulcer duration ≥ 4 weeks but ≤ 52 weeks (12 months). 6. venous insufficiency confirmed by duplex doppler ultrasound examining valvular or venous incompetence. a. availability of a complete report of a previous examination performed 12 months of screening will be acceptable, and this examination would not be required to be repeated. 7. arterial supply adequacy confirmed by any one of the following: 1. great toe pressure ≥ 50 mm/hg 2. systolic blood pressure ankle brachial index (abi) in the range ≥ 0.80 ≤ 1.10 3. tcpo2 ≥ 40 mmhg from the foot 8. willing to follow all instructions given by the investigator, return for all visits, and adhere to compression protocols while on the study. exclusion criteria: 1. a target ulcer of non-venous etiologies (e.g., sickle cell anemia, necrobiosis lipoidica diabeticorum, pyoderma gangrenosum, vasculopathic or vasculitic). 2. acute deep vein thrombosis (dvt), defined as the first 10 days from onset of symptoms, or any dvt for which compression is considered by the investigator to be contraindicated. 3. clinical evidence of ulcer bed infection, or infected hardware. 4. documented history of osteomyelitis at the target ulcer location within six (6) months preceding the screening visit. 5. refusal or inability to tolerate compression therapy. 6. pregnant women. 7. women of child-bearing potential who are unwilling to avoid pregnancy or use an effective form of birth control. 8. hemoglobin a1c (hba1c) level is \> 12% (108 mmol/mol). 9. current therapy with systemic antibiotics. 10. current therapy with cytotoxic agents. 11. current therapy with chronic (\> 10 days) oral corticosteroids. 12. current therapy with tnfα inhibitors other than trental® (pentoxifylline). 13. has tested positive for human immunodeficiency virus (hiv) or has acquired immune deficiency syndrome (aids). 14. has malignancy or history of cancer in the preceding 5 years other than non-melanoma skin cancer. 15. currently on dialysis or planning to start dialysis. 16. is currently enrolled or participated in another device, drug, or biological trial within 30 days of screening. 17. therapy of the target ulcer with other birth tissue products, autologous skin graft, apligraf®, or dermagraft® within 30 days preceding the screening visit. 18. therapy of the target ulcer with topical growth factors within thirty (30) days preceding the screening visit. 19. any previous use of vendaje®, vendaje ac®, amniowrap2® applied to the target ulcer.