Medical grade surgical instrument (AISI 420 martensitic SS) nano coatings use PVD deposition constructing silver-doped (2-5wt% Ag) TiN:Ag antibacterial functional layers. Ag+ ions slowly release, penetrating bacterial cell membranes binding sulfur-containing proteins and DNA bases. Oerlikon BALIMED ARGENTA (TiN:Ag): hardness 25-29GPa (ISO 14577), ASTM 2180 Log3 reduction (50 autoclave cycles), ISO 10993-5 non-cytotoxic. 2025 ACS Applied Bio Materials: (Ag-TiTaZrNbN) high-entropy nitride coating shows excellent bactericidal against P. aeruginosa, ~50% SARS-CoV-2 inactivation. RSC Advances (2025): AgNP-polymer nanocomposites for surgical/orthopedic/drug delivery. Global antimicrobial medical device coating market $548M (2022) to $697M (2029), CAGR 3.5%. FDA/CE certification: 18-24 months, up to $500K/submission. Complies with ISO 13485 quality management and ISO 14971 risk management standards.