Systagenix Wound Management Promogran Prisma® Collagen Matrix Wound Dressing 19-1/9 sq" Systagenix Promogran Prisma® Matrix Wound Dressing is a freeze-dried composite of collagen, oxidised regenerated cellulose (ORC) and silver. It is designed to kick start the healing process while providing protection from infection. It transforms into a soft and conformable, biodegradable gel, which allows contact with all areas of the wound.