Articulated positioning system for devices adapted to externally exert a holding action on bone tissues

摘要

A device for externally exerting a holding action on bone tissues includes a plurality of means for engaging the bone and exerting a holding action thereon. The engaging and exerting means are connected by a central tubular body which is positioned with its axis perpendicular to the surface of the fracture. There are a plurality of clamping means interconnecting the two engaging and exerting means, the clamping means permitting rotational movement thereof and translation along shank portions of the clamping means. At least one of the clamping means can have an adjustable feature including an elongated cylindrical shank, the shank having a threaded axial hole therein and a longitudinal groove on the external surface thereof. The shank is slidably received within a hollow tubular body having a threaded end thereon. A cap is screwed on the threaded end. The body further has a substantially radial threaded hole therein with a first screw inserted in the radial hole and received in the groove. The shank also has an axial opening therein, and a second screw having a head positioned between the cap and the body extends into the axial opening of the shank.