Patent ID: 7156659
Filing Date: 2007-01-02
Classification: A61C,F16D

Abstract:
1. A drive apparatus for a rotary tool used in surgery, including dental surgery, comprising: a handle; a neck linked with the handle by a connection; a head coupled with the neck, for receiving the rotary tool; wherein the handle has an interior which receives an input drive shaft, the neck has an interior which receives an output drive shaft, and the input drive shaft is connected to the output drive shaft by a gear train; wherein the input drive shaft is slidingly mounted in the interior of the handle and the output drive shaft is slidingly mounted in the interior of the neck, forming a sleeve for the input drive shaft and the output drive shaft; abutments formed on the interior of the handle and on the interior of the neck; and an elastic element housed in the connection linking the handle and the neck, for maintaining and supporting the input drive shaft and the output drive shaft on the abutments, wherein the elastic element is formed by a compression spring mounted coaxially with respect to the gear train so that one end of the compression spring bears on the input drive shaft and so that another end of the compression spring bears on the output drive shaft.