Patent ID: 6503252
Filing Date: 2003-01-07
Classification: A61B,B23G

Abstract:
Bone screw for implants for fixation of bone fragments at fractures, wherein the bone screw (6) comprises a threaded part (16) which is adapted to be screwed into a bone fragment (4) at the fracture (2), the threaded part (16) extends backwards from a front end (17) of the bone screw (6) to an unthreaded part (18) thereof, the threaded part (16) has threads (19) with the same outer diameter (YD) throughout the extent of said threaded part (16), the threads (19) in the threaded part (16) have the same pitch of thread (P) throughout the extent of said threaded part (16), the threads (19) on the threaded part (16) extend from a core (21), the core (21) has a uniform taper throughout the length of the threaded part (16) and has a smallest diameter (MD) situated at said front end (17) of the bone screw (6), the threads (19) have truncated crests (23), that the width (b1-b7) of the crests (23) of the threads (19) increases in a backwards direction from the front end (17) of the bone screw (6), the width (B1-B6) of groove (20) between the threads (19) decreases in a backward direction from the front end (17) of the bone screw (6) as the width (b1-b7) of the crests (23) increases.