French Prime Minister Jean-Pierre Raffarin has returned home from hospital after undergoing surgery on his gall bladder, his office said on Tuesday. "His schedule will be adapted for several days for convalescing," an official in the prime minister's office said, but gave no further details of Raffarin's work plans. Raffarin, 56, had gallstones removed on Saturday after his gall bladder became acutely inflamed. Aides say he is fine. Television pictures showed Raffarin waving from his car as he left the Val de Grace hospital in Paris, Reuters reported . Gallstones are solid stones that form in the gall bladder from cholesterol, bile salts and calcium.