Locking device for locking a rod-shaped element in a receiving part of a bone anchor and bone anchoring device with such locking

摘要

Locking device for securing a shaped element rod in a receiving part of a bone anchor, said locking device comprising: a first locking element (6, 600, 6 ') having a first end (61, 601) and a second end (62, 602) is provided with an external thread (63, 603) at least on a portion thereof, a coaxial bore (64, 604) which passes completely through the first locking element, the bore having a coaxial bore axis (C) and an internal thread (65, 605) provided on at least a portion of said bore, a second locking member (7, 700, 7 '), the second locking member having a first end (71, 701) and a second end (72, 702), an outer surface with an external thread (73, 703) at least in a part thereof cooperating with the inner thread provided in said bore of the first locking element, being movable second locking member (7, 700, 7 ') along the drill axis (C) g OOKING thereon and a feed path of the second locking element towards the first end being limited by a first stop (66, 606c) and towards the second end (62b, 606D) by a second stop, and when the second element lock (7, 700 ', 7') is in a first position defined by the first stop (66, 606c), its first end (71, 701) facing the first end (61, 601) of the first locking element ( 6, 600) is located within the bore.