The family of an 86-year-old woman who died after she fell from an operating table following hip surgery has settled a wrongful death lawsuit with Boston Medical Center. The settlement halted a trial that was set for Oct. 14 and saved the teaching hospital a trip to court. The family's lawyer, Andrew C. Meyer Jr., said the hospital agreed to pay $900,000. Meyer said the case exposed gaps in operating room procedures and hopefully will prevent future tragedies.