The study has been designed as a dose escalation study, and will serially explore increasing concentrations of the Aurase enzyme in a relevant patient population. Five cohorts (of 10 patients each, except cohort 1 with 5 patients), will receive standard of care supplemented with increasing concentrations of Aurase and will be assessed for clinical tolerability at the wound site, systemic safety and efficacy (extent of wound debridement) over a period of 4 weeks. Patients will receive a total of 12 doses of Aurase Wound Gel. At the end of the study, patients will revert to standard of care only.