A connector for connecting the rod to a bone anchor, an apparatus for placing the connection device on the head of the bone anchor, a system of a connector for connecting the rod to a bone anchor and an instrument, and a method of placing the connector on the head of the bone anchor

摘要

Problem to be solved: to provide a connecting device for connecting a rod to a bone anchor.The receiving portion (20) of the coupling device is provided with a head receiving portion (22) that includes an inner seat (35) for pivotally receiving the head (3) of the bone anchor, and is extendable to enable the insertion of the head The inserted head can be compressed to lock the seat.The receiving portion further comprises a rod receiving portion (21) including a recess (24) having a first engaging structure (32) for engagement with the instrument (100).A locking ring (40) comprising a second engagement structure (44a) for the appliance around the head receiving portion is provided when the lock ring is around the head receiving portion The lock ring can take the insertion position where the head (3) of the bone anchor can be inserted into the head receiving portion and the temporary lock position where the inserted head is prevented from being detached from the head receiving portion.Diagram