Biedermann Technologies Gmbh & Co. Kg

Hahn-schickard-gesellschaft Fuer Angewandte Forschung E.v.

Hahn-schickard-gesellschaft Fur Angewandte Forschung E.v.

Michael Kegel

Lutz Biedermann

Wilfried Matthis

Thomas Lorenz

Markus Clemenz

The invention relates to an access device comprising: a base () for aligning the access device with the skin of a patient; a needle for puncturing the skin, the needle comprising a hub () and a cannula (), and the needle being movably mounted in the base () such that it can move between a first, fully retracted, and a second, maximally extended, position; and a locking mechanism which engages when the needle retracts from the second position and reaches a discrete third position, inhibiting the needle from further retracting to the first position. According to the invention, the access device is actuatable to disengage the locking mechanism.

Access device

A polyaxial bone anchoring device includes

Polyaxial bone anchoring device

A polyaxial bone anchoring device includes an anchoring element having a shaft and a head having a curved outer surface portion; a receiving part having a top end and a bottom end, a coaxial bore extending from the top end in the direction of the bottom end, and a seat portion for receiving the head at the bottom end; and a pressure element having a head contacting surface portion that contacts the curved outer surface portion of the head; wherein the head is pivotable with respect to the receiving part and can be fixed at an angle by exerting pressure via the pressure element, and wherein the head has an oversize in the curved outer surface portion with respect to the head contacting surface portion, such that an interference fit is achieved that clamps the head by the friction between the outer surface portion and the head contacting surface portion.

A tool is provided for use with a bone anchor, wherein the bone anchor has an anchoring section and a receiving portion for receiving a rod to be connected to the anchoring section and a locking element, the tool comprising a tip portion for engaging the locking element; a mechanism to apply torque to the tip portion comprising a drive shaft and a driven shaft coupled by a gear unit, where the drive shaft has a different axis than the driven shaft, and where the driven shaft comprises an engagement portion configured to connect the driven shaft to the gear unit; and a counter-holding portion for engaging the receiving part, wherein the counter-holding portion is rotatable with respect to the tip portion.

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Tennenbronn, Germany

Michael Kegel