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AssigneeWerner Hermann
InventorsWerner Hermann, Klaus A. Matzen, Beat Buetler
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A shackle element, a method of making a shackle element, a hook and a rod connector. The shackle element (18) is used for fastening a hook (12), or respectively a rod connector, on a fixation rod (10). The shackle element (18) forms a groove with a lateral opening for inserting the fixation rod (10). The groove is delimited by a groove bottom (18.1) and two lateral wails (18.2, 18.3). After mounting the groove bottom (18.1) encloses the fixation rod (10) over an angle of 180° plus a partial angle. The lateral walls are arranged under a small angle; their distance increases with growing distance from the groove bottom so that the lateral opening is large enough for introducing the rod. The lateral walls are intended to be pushed together by means of a screw device (20.1, 20.2) for clamping the fixation rod (10). The groove bottom (18.1) encloses the fixation rod (10) over an angle of 180° plus a partial angle. The hook (12) has the shackle element (18) and a hook element (16), which grips a laterally extending portion (1) of a spine of a patient underneath or from above. The rod connector (32) has the shackle element (18) and a clamping device (34) for a transverse rod (10.1), which is oriented transversely in respect to the fixation rod (10). The hook (12) and the rod connector (32), along with fixation rods (10) and transverse rods (10.1), are employed as parts of internal orthopedic fixation devices.
A shackle element for clamping a fixation rod essentially extending along a spine, having
The shackle element in accordance with at least one of the preceding claims, wherein the lateral wall provided with the interior screw thread has been made thicker in the direction of the axis of the screw device than the lateral wall provided with the through bore.
The shackle element in accordance with at least one of the preceding claims, wherein the surface of the shackle element, which faces the exterior of the lateral wall and is provided with the through bore, has at least one protrusion, which can be elastically deformed by means of a nut, or respectively a screw cap of the screw device in order to form a securing device for the screw.
The shackle element in accordance with at least one of the preceding claims, wherein the distance of the thread axis from the center of the circle which can be drawn in the groove bottom equals the sum of the radii of this circle which can be drawn in and of the screw bolt, which in this area is preferably free of screw threads.
The shackle element in accordance with a least one of the preceding claims, wherein the groove bottom has circumferential or almost circumferential rills.
A method of making a shackle element for clamping a fixation rod, the shackle element having a groove with a groove bottom extending in cross section along an arc of 180° plus a small partial angle, two lateral walls adjoining the groove bottom, the method comprising the steps of
A hook with a shackle element for clamping a fixation rod and with a hook element, which is integral with the shackle element and projects away from a lateral wall of the shackle element, which is intended for gripping a laterally extending portion of a spine from above or below.
Dependencies are inferred from the claim text.