Expiration dating not needed on commercially sterilized items.
Maintenance of sterility of commercially sterilized medical devices is event related, not time related/JCAH has clarified how hospitals' use of such devices without expiration dating meets its infection control standards.
D003428:Cross Infection / Q000517:prevention & control; D004865:Equipment and Supplies, Hospital / Q000592:standards*; D006801:Humans; D007591:Joint Commission on Accreditation of Healthcare Organizations; D011356:Product Labeling / Q000592:standards*; D013242:Sterilization / Q000592:standards*; D013997:Time Factors