US 5,916,268 A · Kit for an artificial acetabulum

Abstract

The kit contains a metal outer shell (1), an inner shell (2) which can be inserted therein, and fastening elements which can be mounted on the outer shell (1) so that they substantially protrude radially, and which include at least one support (4) and two screw connections (5). The fastening elements, which can be designed with varying support lengths, together with the outer shell (1) form a tripod, which positions the outer shell (1) outside the osseous tissue (6). The outer shell (1) is designed all around with through-holes (17) mounted at different angles (14), which permit the mounting of the screw connections (5) in correspondingly different angular positions with respect to the support (4). The kit, which by simple means enables an optimal adjustment of the acetabulum which can be corrected during implantation if necessary, is provided as a replacement for a missing pelvic part in the region of the hip joint

Claims23

Dependent claims

A kit for an artificial acetabulum comprising:

a metal outer shell having an outer surface and an inner surface;
an inner shell for insertion into the outer shell and against the inner surface thereof;
connecting means projecting from the outer surface of the outer shell for securing the outer shell to a bone structure and including at least one support adapted to be immovably anchored to the bone structure, at least two screw connections adapted to be screwed into the bone structure, and means for releasably securing the outer shell to the support and to the screw connections;
and
adjustment means operatively coupled with the connecting means for locating the outer shell at a desired position which is spaced from the bone structure.

2 more elements

A method for attaching an artificial acetabulum to a bone structure in spaced-apart relation thereto, the method comprising the steps of:

providing an artificial acetabulum including a generally semispherically shaped outer shell having a plurality of through-holes arranged at desired locations between an end face and a polar axis of the outer shell, and an inner shell for insertion into and attachment to the outer shell;
forming an opening in the bone structure;
anchoring a support for the artificial acetabulum in the opening;
providing a hole gauge having the same shape as the outer shell and securing the hole gauge to the support so that the hole gauge is in a position relative to the bone structure where the outer shell is to be located;
forming first and second holes with the hole gauge in the bone structure which are aligned with first and second through-holes in the outer shell selected to be used for attaching the outer shell to the bone structure;
removing the hole gauge from the support;
providing a sleeve having a first end defining a bone screw, a second, open end and an internal thread extending from the open end into the sleeve and screwing the sleeve into a selected one of the formed holes;
threadably attaching an elongated adaptor to the sleeve so that a proximal end of the adaptor extends past the open end of the sleeve;
securing the outer shell in its desired position to the support;
placing a spacer disc concentrically to the other one of the selected through-holes between the bone structure and the outer shell and applying a bone screw through the other one of the selected through-holes and the spacer disc into the second hole formed in the bone structure;
turning the adaptor relative to the sleeve until the proximate end of the adaptor abuts the outer shell;
fixedly securing the outer shell to the adaptor;
and
inserting the inner shell in and attaching it to the outer shell.

11 more elements

Dependencies are inferred from the claim text.

Kit for an artificial acetabulum

Life of this patent

Kit for an artificial acetabulum

Life of this patent

Abstract

Claims23