Device at fixing means for fixation of bone fragments at bone fractures

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 (7f) 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 (7f) includes a front part (7a) which is directed obliquely forward relative to a rear part (7e) of the pin (7) and towards a front parts (9a) of the second wall surface (9) close to the guide surface (12) in that the front end portion (7f) 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 (7d) of the pin (7) is directed obliquely forward towards the first longitudinal wall surface (8), a contact part (7b) between the intermediate part (7d) and the front part (7a) is in contact with the first longitudinal wall surface (8), and the rear part (7e) 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).