Granulox is a haemoglobin spray and is used as a topical oxygen therapy for the treatment of chronic wounds. Haemoglobin is able to bind oxygen and then release it again. When sprayed onto the wound, the water-soluble, red haemoglobin spray is uniformly distributed in the exudate, binding oxygen from the surrounding air and transporting it to the wound base, from which it diffuses into the cells. This process repeats itself continuously and without using up haemoglobin. In this way, large quantities of oxygen can be brought to the wound base. The oxygen supply of the cells is increased, while the hypoxia is reduced. The wound situation should then improve, and wound healing is accelerated (Von Eiff, 2013).