Patent ID: 7931653

Claim:
Device at fixing means for fixation of bone fragments at bone fractures, said fixing means ( 1 ) preferably being a spike for fixation of bone fragments at trochantery hip fractures, wherein the fixing means ( 1 ) comprises a sleeve ( 5 ) and a pin ( 7 ) which is insertable into the sleeve ( 5 ) and displaceable in the longitudinal direction thereof, the pin ( 7 ) having a geometric centre line (CLS), wherein the pin ( 7 ) has a rear part ( 8 ) and at least two front parts ( 9 , 10 ) with bent points or tips ( 11 , 12 ), and wherein front parts of the sleeve ( 5 ) have openings ( 13 , 14 ) through which the front parts ( 9 , 10 ) of the pin ( 7 ) can be forced, characterized in that the front parts ( 9 , 10 ) of the pin ( 7 ) have a successively increasing thickness (T 1 and T 2 respectively) in backwards direction to the rear part ( 8 ) of the pin ( 7 ) such that said front parts ( 9 , 10 ), when forced or driven out of the sleeve ( 5 ) through the openings ( 13 , 14 ), are formed into arcuate parts, the points ( 11 , 12 ) of which are curved in a backwards direction such that each front part ( 9 , 10 ) intersects an axis extending through the openings ( 13 , 14 ) and perpendicular to the geometric centre line (CLS) twice, and such that those portions of the front parts ( 9 , 10 ) which after said outward driving of said front parts ( 9 , 10 ) are situated at the sleeve ( 5 ), are thicker and thereby stronger than those portions of said front parts ( 9 , 10 ) which grip into the bone material ( 3 ).