Difficult cavity wounds have undermined and tunnelling morphology of their edges or a  location which is difficult to access. Collagen dressing is an interactive dressing designed for  wound management. Collagen particles are designed for cavity wound management. Filling  the difficult cavity wound with collagen particles has some practical problems. To overcome  these problems, we have used an innovative method of filling collagen particles in difficult  cavity wound. Innovative method of filling collagen particles is simple and effective solution  of the problems faced in managing difficult cavity wounds.