Centrifugal deflection device for a surgical or dental handpiece for removing foreign matter

A centrifugal deflection device configured to be fitted to a surgical or dental handpiece for preventing the penetration of foreign matter that results from an operation, said centrifugal deflection device comprising:

• a ring coupled in rotation, either directly or via a tool shank, to a drive shaft of the handpiece, the ring being covered by a sleeve fixed to a front end of a body of the handpiece, and which, with the ring, delimits an ejection chamber,
• said ejection chamber including an inlet that communicates with a rear area of the handpiece and an outlet that communicates with the external environment, the ring having a first diameter at the outlet of the ejection chamber, and a second diameter at the inlet of the ejection chamber, the first diameter of the ring being larger than the second diameter of the ring, the sleeve being made in a single piece with the body of the handpiece,
• wherein the ring includes, on the front end side of the handpiece, a flange of generally truncated shape, whose diameter decreases towards the rear end of the handpiece, said flange being extended towards the rear of the handpiece by a sleeve, whose external diameter is smaller than the largest diameter of the flange, the ring being coupled in rotation to the drive shaft of the handpiece by a coupling part.