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Bone anchoring device
专利权人:
BIEDERMANN TECHNOLOGIES GMBH & CO. KG
发明人:
MATTHIS, WILFRIED,MEER, MARTIN,BIEDERMANN, LUTZ
申请号:
ES12153154
公开号:
ES2528969T3
申请日:
2012.01.30
申请国别(地区):
ES
年份:
2015
代理人:
摘要:
Polyaxial bone anchoring device, which includes a bone anchoring element (1, 1 ', 1' ', 1' '', 1 '' '') that has a head (3, 3 ', 3' ', 3 '' ', 3' '' ') and a rod (2, 2', 2 '', 2 '' ', 2' '' ') to anchor it in the bone, a receiving or accommodation piece (4, 4 ', 4' ', 4' '', 4 '' '') to attach the bone anchoring element (1, 1 ', 1' ', 1' '', 1 '' '') with a rod (100), said housing part (4, 4 ', 4' ', 4' '', 4 '' '') comprising an accommodation space (8, 8 ', 8' ', 8' '', 8 '' '') to accommodate the head (3, 3 ', 3' ', 3' '', 3 '' '') and a drill (41, 41 ', 41' ', 41' '', 41 ' '' ') that communicates with the accommodation space (8, 8', 8 '', 8 '' ', 8' '' '), having the drill (41, 41', 41 '', 41 '' ' , 41 '' '') a drill shaft, a pressure element (6, 6 ', 6' ', 6' '', 6 '' '') that is configured to move in the drill (41, 41 ' , 41 '', 41 '' ', 41' '' ') and comprising a first surface to engage the head (3, 3', 3 '', 3 '' ', 3' '' ') and a second surface on the which acts on the rod (100), the pressure element (6, 6 ', 6' ', 6' '', 6 '' '') being configured to adopt a first position in which it exerts a previous load on the head (3, 3 ', 3' ', 3' '', 3 '' ''), which results from friction between the first surface and the head (3, 3 ', 3' ', 3' '', 3 '' ''), to allow the stem (2, 2 ', 2' ', 2' '', 2 '' '') to be held in a desired angular position before locking the head (3, 3 ', 3 '', 3 '' ', 3' '' ') in the housing (4, 4', 4 '', 4 '' ', 4' '' '), and a second position in which the head (3, 3 ', 3' ', 3' '', 3 '' '') is locked with respect to the housing part (4, 4 ', 4' ', 4' '', 4 '' ' '), obtaining the first position by the movement of the pressure element (6, 6', 6 '', 6 '' ', 6' '' ') by the action of a predefined force acting on the pressure element ( 6, 6 ', 6' ', 6' '', 6 '' '') in axial direction, and maintaining the pressure element (6, 6 ', 6' ', 6' '', 6 '' '' ) in the first position medi before the interaction with the housing part (4, 4 ', 4' ', 4' '', 4
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