User blog comment:Mikividosevicgasparotti/SETH COOPER IS A LOSER/@comment-98.113.206.37-20111217205506/@comment-1296654-20111217213351

Yes, in the films the wand design changes, but that is just the point. The design changes, not the wand. The books always refer to the wand even after Prisoner of Azkaban as being the same phoenix feather wand that he acquired in Philosopher's Stone, something which becomes significant in Deathly Hallows when his wand acts of its own accord when Voldemort attempted to kill him.