China Medical Technologies Inc., a maker of diagnostic products, filed for chapter 15 protection listing as much as $500 million in assets and debts, Bloomberg News reported on Friday. China Medical, which makes products to monitor various diseases including cancer, also listed foreign bankruptcy proceedings pending in the Cayman Islands, according to the court petition posted on Friday. "To date, the liquidators have been unable to locate any other CMED assets anywhere in the world outside the Cayman Islands," said Kenneth M. Krys, joint official liquidator, in a court filing.