Patent ID: 7736146

Claim:
Medical handpiece comprising: a one-piece shaft having a forward shaft section and a rearward shaft section defining an obtuse angle with respect to each other, the forward shaft section and the rearward shaft section each having a longitudinal middle axis, a working head disposed at a forward end of the forward shaft section, the forward shaft section being tapered towards the working head, a drive shaft in the shaft, the drive shaft having a forward drive shaft section and a rearward drive shaft section, the forward and rearward drive shaft sections being in drive connection with one another and angularly offset with respect to one another, and an axis of rotation of the forward drive shaft section being arranged so that the axis of rotation is angularly offset with respect to the longitudinal middle axis of the forward shaft section, a forward end of the forward drive shaft section standing in drive connection with a tool holder movably mounted in the working head, and, the forward drive shaft section being mounted in a receiving sleeve, wherein the rearward shaft section defines a receiving hole for receiving the forward drive shaft section and the receiving sleeve during assembly of the handpiece or replacement of the forward drive shaft section and the receiving sleeve, wherein the receiving sleeve can be screwed, from the rear, into the forward shaft section, and wherein a rearward edge of the receiving hole proximate a convex bulge side of the one-piece shaft is spaced from the axis of rotation of the forward drive shaft section by a distance of at least half of a cross-sectional dimension of the receiving sleeve.