A microdebrider (2) comprising: a handpiece (4)； an interchangeable tip (10) connected to the handpiece； an outer tube (16) rotatably connected to the interchangeable tip, the outer tube including an outer tube window (18)； an inner tube (12) extending at least partially through the outer tube, the inner tube including an inner tube window (14)； an outer collet (21) connected to the outer tube； an inner collet (22) connected to the inner tube； and a bias member (30) located between the inner collet and the outer collet； wherein the inner tube and the outer tube are immobilized when the inner collet and the outer collet are in contact.
