Surgical instrument, surgical handpiece and surgical drive system

摘要

In order to improve a surgical instrument comprising a shank and a drive shaft, which is rotatably mounted in the shank and bears or comprises a tool element at its distal end, wherein in the distal end region of the shank a radial bearing is arranged or configured for the rotatable mounting of the drive shaft on the shank, such that a reliable operation is possible even with increasing miniaturisation of the shanks, it is proposed that the radial bearing is configured in the form of a needle bearing.;An improved surgical handpiece as well as an improved surgical drive system are additionally proposed.

主权项

1. A surgical instrument, comprising:
a shank, a drive shaft, which is rotatably mounted in the shank and bears or comprises a tool element at a distal end, a radial bearing arranged or configured in a distal end region of the shank for the rotatable mounting of the drive shaft on the shank, wherein the radial bearing being configured in the form of a needle bearing having a bearing cage, and a needle bearing locking arrangement for axially securing the needle bearing on the shank, the needle bearing locking arrangement comprising at least one first locking element and at least one second locking element, one of the at least one first and second locking elements being arranged or held on the needle bearing, the other of the at least one first and second locking elements being arranged or held on the shank, and the at least one first locking element and the at least one second locking element being in engagement with one another in a locking position, wherein:
the bearing cage defines a longitudinal axis and comprises an inner surface concentrically surrounding the longitudinal axis and an outer surface concentrically surrounding the longitudinal axis, andthe at least one first locking element protrudes from the outer surface or projects beyond the outer surface, but does not protrude from or project beyond the inner surface.