| 摘要 |
A bone anchoring device is provided comprising a bone anchoring element (1, 1', 1'', 1''', 1'''') having a head (3, 3', 3'', 3''', 3''''), a receiving part (4, 4', 4'', 4''', 4'''') for coupling the bone anchoring element (1, 1', 1'', 1''', 1'''') to a rod (100), the receiving part (4, 4', 4'', 4''', 4'''') comprising a bore (41, 41', 41'', 41''', 41'''') and a pressure member (6, 6', 6'', 6''', 6'''') configured to move in the bore (41, 41', 41'', 41''', 41''''), wherein the pressure member (6, 6', 6'', 6''', 6'''') is configured to assume a first position in which it exerts a preload onto the head (3, 3', 3'', 3''', 3'''') to enable the bone anchoring element to be maintained in a desired angular position and a second position in which the head (3, 3', 3'', 3''', 3'''') is locked with respect to the receiving part (4, 4', 4'', 4''', 4''''), and wherein the first position is obtained by moving the pressure member (6, 6', 6'', 6''', 6'''') by the action of a predefined force and wherein the pressure member (6, 6', 6'', 6''', 6'''') is maintained in the first position by interaction with the receiving part (4, 4', 4'', 4''', 4'''') and can be released from the first position through action of an axial force. |
