The maker of implants and other medical gear received a warning letter from the Food and Drug Administration. Stryker (SYK) didn't release the letter, but said the FDA cited it for not notifying regulators about a product recall, and for marketing medical devices including the Neptune Waste Management system without a gov't approved application. Neptune is a suction system used in operating rooms to dispose of fluids. Stryker said it's submitted correction plans to the FDA. Shares rose 0.9% to 66.79.