The 3M Tegaderm Matrix Dressing with PHI technology is indicated for use with chronic, non-infected wounds, including diabetic ulcers, pressure ulcers (stages II-IV) and venous stasis ulcers and has demonstrated favorable results on hard-to-heal wounds. PHI technology consists of a unique blend of cations found naturally in the body, including potassium, zinc, calcium and rubidium. This technology responds to body temperature and promotes a natural moisture balance to help chronic wounds progress toward healing. The new dressing is comfortable, safe and easy to use. Its unique formulation creates a favorable, moist wound environment that does not harm the patient's skin, affect tissue integrity or cause maceration.