Johnson & Johnson could shell out up to $1 billion for lawsuits concerning its subsidiary DePuy Orthopaedics and the metal-on-metal hip implants that were found to shed minute metal particles into a patient's bloodstream over time. Lawsuits over the ASR implant have piled up across the country, accusing DePuy of manufacturing a defective product, failing to warn patients and doctors of problems with the implant and negligence in designing, manufacturing and selling the product. DePuy, which introduced the ASR in the U.S. in 2005 after winning 510(k) clearance from the Food & Drug Administration, allegedly knew of design problems with the cup but failed to adequately warn physicians, according to the lawsuits.