Patent ID: 7416411

Claim:
Medical handpiece having an elongate grip part, having a forward end region, and a clamping sleeve in which a shaft of a tool can be inserted and clamped being rotatably mounted in said forward end region of said grip part, wherein the clamping sleeve has a longitudinal region with a constriction section having an increased inner thickness compared to a remainder of said longitudinal region, said increased thickness resulting in a reduced inner cross-section in said constriction section, and a plurality of axial clamping slots extending longitudinally along a portion of the clamping sleeve including said constriction section, wherein one or more portions of said clamping sleeve between said plurality of axial clamping slots define one or more clamping webs, said clamping sleeve being surrounded by a sleeve receiving space including a forwardmost receiving space stage and a second receiving space stage, wherein an inner surface of said forwardmost receiving space stage includes a rotary mounting for a forward end section of said clamping sleeve, wherein, without the insertion of said tool shaft, an outer form of said clamping sleeve is cylindrical in the region of the constriction section, and is so configured that an outer diameter of said longitudinal region is substantially equal along the entire length of said longitudinal region and, with the insertion of the tool shaft, the outer form of said one or more clamping webs is outwardly convex relative to said clamping sleeve cylindrical form, said one or more clamping webs having a barrel-like outward bulge, wherein said sleeve receiving space is broadened from the forwardmost receiving space stage to the second receiving space stage in the region of said clamping webs, the cross section of said second receiving space stage being the same or greater than said barrel-like outward bulge.