EXTENSION DEVICE FOR A BONE ANCHOR

摘要

An extension device for a bone anchor includes at least one tab, which includes an elongate shaft portion that forms part of a channel for providing a stabilization rod to a rod receiving recess of a receiving part of the bone anchor, and a coupling portion, which is provided at a distal end of the elongate shaft portion and which is configured to be coupled to the receiving part. The coupling portion includes a first engagement portion for engaging a first engagement face of the receiving part and a second engagement portion for engaging a second engagement face of the receiving part. A spring element is provided at the coupling portion, the spring element exerting a compression force to urge the first and second engagement portions in mutually opposite directions towards each other and towards the corresponding first and second engagement faces along a longitudinal axis defined by the extension device and the receiving part when being coupled together.

主权项

1. An extension device system comprising:
a receiving part of a bone anchor comprising two legs defining a channel for receiving a rod, wherein each leg includes a first engagement face and a second engagement face; and at least one tab comprising:
an elongate shaft portion that forms part of a channel for guiding surgical implants to the bone anchor; anda coupling portion provided at a distal end of the elongate shaft portion, wherein the coupling portion includes a first end, a second end, a first engagement portion adjacent the first end configured to engage the first engagement face of the receiving part, and a second engagement portion adjacent the second end configured to engage the second engagement face of the receiving part, wherein a spring element is provided at the coupling portion, and wherein when the at least one tab is coupled to the receiving part, the spring element is configured to exert a compression force to urge the first and second engagement portions in mutually opposite directions towards each other and towards the corresponding first and second engagement faces along a longitudinal axis defined by the combined tab and receiving part.