Patent ID: 7029476

Claim:
Device which includes a fixing means for fixation of bone fragments at bone fractures, wherein the fixing means ( 1 ) preferably is a spike for thigh-bone necks for fixation of bone fragments ( 2 , 3 ) at fractures ( 4 ) of the thigh-bone neck, wherein the fixing means ( 1 ) comprises a sleeve ( 5 ) which is open at the rear for insertion of a pin ( 7 ) into a ready position (B), wherein the sleeve ( 5 ) defines an elongated space ( 6 ) with two opposite wall surfaces ( 8 , 9 ), namely a first longitudinal wall surface ( 8 ) in which there is provided a side opening ( 10 ) and a longitudinal second wall surface ( 9 ) from which a guide surface ( 12 ) extends in an inclined forward direction to a front edge ( 13 ) of the side opening ( 10 ), and wherein the guide surface ( 12 ) is provided to guide a front, preferably curved end portion ( 7 f ) of the pin ( 7 ) to force its way out through the side opening ( 10 ) when said pin ( 7 ) is displaced in a forward direction relative to the sleeve ( 5 ), characterized in that a portion of the pin ( 7 ) closest to the front end portion ( 7 f ) includes a front part ( 7 a ) which is directed obliquely forward relative to a rear part ( 7 e ) of the pin ( 7 ) and towards a front parts ( 9 a ) of the second wall surface ( 9 ) close to the guide surface ( 12 ) in that the front end portion ( 7 f ) of the pin ( 7 ) engages the side opening ( 10 ) when the pin ( 7 ) is located in a ready position (B) in the sleeve, an intermediate part ( 7 d ) of the pin ( 7 ) is directed obliquely forward towards the first longitudinal wall surface ( 8 ), a contact part ( 7 b ) between the intermediate part ( 7 d ) and the front part ( 7 a ) is in contact with the first longitudinal wall surface ( 8 ), and the rear part ( 7 e ) is in contact with the second longitudinal wall surface ( 9 ) when the pin is in the ready position (B), ( 5 ) and the pin ( 7 ) has a length relative to the length of the elongated space ( 6 ) of the sleeve ( 5 ) such that a rear edge ( 17 ) of the pin ( 7 ) is located edge-to-edge with a rear edge ( 23 ) of the sleeve ( 5 ) or within said rear edge ( 23 ) when the pin ( 7 ) is fully driven into the sleeve ( 5 ), so that the pin ( 7 ) after finished driving or actuator operation does not project from the rear of the sleeve ( 5 ).