Device bone anchorage including: an anchoring element (2) having an axis (3), intended to be anchored in a bone and a head (4), a receiving part formed in one piece, comprising a seat (52) intended to receive the head (4) and a channel (54) for receiving a rod (20) which is connected to the anchoring element a pressure element (6, 601, 602, 603) formed in one piece, and displaceable in the receiving part so that it can exert pressure on the head, whereby the anchoring element rotated relative to the receiving part and It is set at an angle by applying pressure on the head via the pressure element, and wherein the pressure element (6, 601, 602, 603) a cylindrical recess (62, 620) suitable for receiving the rod (20 ) inside thereof so that two free arms (63, 64) constituting the side walls of a channel for receiving the rod (20), characterized in form because the pressure element (6, 601, 602, 603) it comprises a spring element (66, 66 ) formed integrally on the outer wall of each of the arms, and which is provided with a retaining portion (67, 67) and which engages a part (58 , 59) of the receiving part so that the pressure element (6, 601, 20 602, 603) remain in or na position allowing the rotation of the anchoring element, and the element spring (66, 66 ) is formed by a part of the wall which is separated by a groove (69, 69, 690, 690 , 691, 691 ).Dispositivo de anclaje de hueso que incluye: un elemento de anclaje (2) que tiene un eje (3), destinado a ser anclado en un hueso y una cabeza (4), una pieza receptora formada en una sola pieza, que comprende un asiento (52) destinado a recibir la cabeza (4) y un canal (54) destinado a alojar una varilla (20) que se conecta con el elemento de anclaje un elemento de presión (6, 601, 602, 603) formado en una sola pieza, y que puede desplazarse en la pieza receptora de modo que puede ejercer presión sobre la cabeza, pudiendo el elemento de anclaje girar con respecto a la pieza receptora y ser fijado en un ángulo mediante la
