a medical prosthetic device or medical implant containing a metal material selected from the group consisting of titanium or an alloy thereof , zirconium or an alloy thereof , tantalum or an alloy thereof , hafnium or an alloy thereof , niobium or an alloy thereof and a chromium - vanadium alloy , wherein surface parts of the metal material are coated with a layer of a corresponding hydride material selected from titanium hydride , zirconium hydride , tantalum hydride , hafnium hydride , niobium hydride and chromium and / or vanadium hydride , respectively , said device or implant being characterized in that the layer of hydride material comprises one or more biomolecule substances associated therewith . the device or implant exhibits improved biocompatibility . the metal material is preferably titanium . the biomolecule substance may be selected from the following types of substances : natural or recombinant bio - adhesives ; natural or recombinant cell attachment factors ; natural , recombinant or synthetic biopolymers ; natural or recombinant blood proteins ; natural or recombinant enzymes ; natural or recombinant extracellular matrix proteins ; natural or synthetic extracellular matrix biomolecules ; natural or recombinant growth factors and hormones ; natural , recombinant or synthetic peptide hormones ; natural , recombinant or synthetic deoxyribonucleic acids ; natural , recombinant or synthetic ribonucleic acids ; natural or recombinant receptors ; enzyme inhibitors ; drugs ; biologically active anions and cations ; vitamins ; adenosine monophosphate , adenosine diphosphate or adenosine triphosphate ; marker biomuolecules ; amino acids ; fatty acids ; nucleotides ; and sugars .