Patent ID: 6245075
Filing Date: 2001-06-12
Classification: A61B,F16H

Abstract:
A traction apparatus for moving apart two parts of a bone of a patient comprising a medullary pin which can be placed into a medullary space of a bone and which has two parts, respectively securable to one of the two bone parts, which can be moved axially apart, a drive unit for driving a drive shaft and a device for converting rotational movement of the drive shaft into a relative axial movement of the two parts of the medullary pin, and planetary rollers driven by the drive shaft and held in orbits on which drive grooves on their outer circumference engage corresponding drive grooves of a hollow body surrounding the planetary rollers, at least the drive grooves of one of the hollow body and the planetary rollers being formed as thread grooves so that, on a rotation of the drive shaft, the hollow body is displaced axially relative to the latter.