Patent ID: 9642657
Date: 2017-05-09
CPC Classifications: A61B

Claim:
1. A device for fixation of bone fragments at bone fractures, wherein the device comprises at least two fixation means and a securing plate, wherein the securing plate is configured with a threaded hole for each fixation means, wherein each fixation means is a bone nail which comprises a sleeve and, disposed therein, a pin arranged for movement in the sleeve so that at least a forward portion of the pin can be driven outwards through at least one side aperture in the sleeve, wherein the forward portion of the pin constitutes a first fixing portion in the form of at least one hook which is configured to engages in an inner bone fragment for fixing the bone nail therein, wherein a rear end portion of the sleeve is threaded and defines a second fixing portion for locking the bone nail to the securing plate which is configured to be disposed on the outside of an outer bone fragment without fixed connection therewith such that movement of the outer bone fragment relative to the securing plate is allowed and such that change of the angular position of the bone nails relative to the securing plate and relative to one another is prevented, wherein a middle portion of the sleeve is situated between the side aperture in the sleeve and the second fixing portion thereof and is configured to run through the outer bone fragment, said middle portion being configured such that the outer bone fragment during secondary compression can slide inwards therealong away from the securing plate and towards the inner bone fragment in which the bone nail is fixed, and wherein the thread of each threaded hole in the securing plate is configured such that after screwing of the threaded rear end portion of the sleeve into the threaded hole until the said threaded rear end portion reaches a surface in the hole against which said threaded rear end portion can abut to prevent further screwing of the rear end portion into the threaded hole, the side apertures in the sleeves all being configured to face a central portion of the inner bone fragment when said threaded rear end portions abut the surfaces in the holes.