Patent ID: 6355043
Filing Date: 2002-03-12
Classification: A61B

Abstract:
A bone screw for anchoring a marrow nail, and penetrating the marrow nail transversely with a distal part in a suitable transverse bore and supporting the marrow nail with a middle part at the transverse bore, the screw comprising a head part for the application of a turning-in tool, the middle part and the distal part including a thread having a pitch S, and a core diameter D1 and an outer diameter D3, wherein the thread includes a cylindrical core part having a length l>0.3 S; wherein a proximal portion of the head part includes a proximal thread with the same core diameter D1 and with the same pitch S as the thread distal part, but having an outer diameter D2 that is greater than the outer diameter D3 of the distal part and that is greater than the inner diameter of the transverse bore in the marrow nail; and wherein a reverse-side, proximally directed flank of both threads is on a common helix.