Advances in any branches of technology essentially depends on the branch development. The tonnage and nomenclature of medical polymers in the world grow faster that those of commercial polymers. Polymers are involved now in almost any field of medicine. They are widely used in restorative surgery as prosthesis, coverings for wounds and burns, blood substitutes, as packing for drugs, for nursing items, as medical equipment parts, and so on. Two basic questions are of interest to the bioengineer producing the items and the physician using them in practice, namely: their biocompatibility and the retaining of their effective mechanical, diffusive, optical and other properties.