ARTIFICIAL HIP JOINT PAN.

The invention concerns an artificial hip joint pan, consisting of a metallic outer shell and of, the pan bowl for the admission of a ball joint containing plastic pan body, which is embodyable in the Aussenscha e, whereby with a multiplicity of depressing openings for bone screws provide the outer shell ist.

A hip joint pan that kind managing specified is admits from the CH patent 671,687; the multiplicity of the depressing openings for bone screws in the outer shell are to the operating surgeon a number of options for setting and embodying the screws in the bone to offer. Therefore few become benutzt.

of these openings in individue] len case generally only or In practice now pointed that under the demands of the implantierten pan of the plastic pan bodies ka] it tfliesst itself and to the “not-binding” depressing openings eindringt.

That leads to deformations of the pan body and the pan bowl, whereby in this erhõhter abrasion entsteht.

Task of the invention is it to prevent the cold flow of the pan body into the free depressing openings; this goal is obtained because the ãussere surface of the pan body at least within the range of the depressing openings of the outer shell with one metai] ischen interface occupied ist.

The cover of the free depressing openings effectuation thereby that a Kalffliessen of the pan body is suppressed into the depressing openings inside, but does not only prevent also direct contacts between plastic and living fabric within the range of the openings with Sicherheit.

A favourable construction for the interface results, if the interface exists in an insert closed in circumferential direction into the pan body; because in this case the pan body can be used in any extent angle angle relative to the outer shell, without to a covering of the interface with the depressing openings are paid attention muss.

This is particularly for Pfannenkõrper of importance, which are not rotationally symmetric in circumferential direction, thus for example a one-sided pan roof increase haben.

An adjustment of the interface, which can consist of a multi-layer screen or of a closed plate, on the Pfannenk5rper Nässt in a simple manner by spring-actuated locks manage themselves, at the equatorial bzw.

pole-lateral edge of the interface are intended. Likewise the connection between pan bodies and outer shell in well-known way in a conical Hinterschneidung the outer shell and a fitting cone at the Pfannenkörper.<br exists/> in the following the invention becomes on the basis a remark example in connection with the design erläutert.

Fig. 1 shows a cut II of Fig. 2 by the pan construction; Fig. 2 a supervision gives toward the Polachse the outer shell wieder.

The outer shell 1 for example consisting of titanium is provided in the range lower “geographical” latitudes with an external thread 2, with that it screwed in into the basin bone wird.

At its Poi, by which those runs at the same time a rotational symmetry axle of the outer shell screen end Poiachse 4, it exhibits a drilling 3 for the employment of a setting instrument not shown. Circle-circular grooves 5 serve Einund increasing fabric in the environment of the pole. With their centers on two different “widths” depressing drillings are 6 for bone screws 7 intended in the outer shell 1 over the extent distribute. These drillings 6 are on the inside of the bowl 1 extended that into them a cone case 10 can be inserted, in that the only suggested screw head, in the drilling 6 are sunk in such a way, stored. The cone case increases the variation options for the screwing in directions of the screw 7.

At the equatorial edge the interior cavity of the outer shell 1 is twice in the form of steps for the admission of a plastic pan body 11 abgesetzt.

The diameter-smaller “internal” paragraph 8 participates trained than outward easily extending cone, into as the connection of bowl the 1 and body 11 an appropriate cone of the pan body 11 einschnappt.

In 1 stored pan body the actual pan bowl 12 for the admission of a Gelenkkopfes.<br not shown contains 11 of the Aussenschaie/> With the represented execution form the pan body is extended of 11 on a Teli its extent over the equatorial plane 13 outside. The extension 14 points with the implantierten pan after laterally and has the task, Luxationen of the ball joint when extreme bending of the HüftgeJenkes too vermeiden.

In the spherical, outside surface of the pan body 11 is inserted as interface out of a Tlran sheet metal of manufactured bowl bodies 15, itself the latitudes geographical over the range extended, in which the depressing openings 6 of the outer shell 1 lie. The Schaienkörper 15 becomes in the plastic through over the whole extent running spring-actuated locks 16 and 18 at its equatorial and/or pole-lateral edge gehalten.

For the interference of a setting instrument 11 on the extent drillings are finally 17 verteilt.

in the edge of the pan body An implantation of the new HOftgelenkspfanne can take place for example in such a manner that first the outer shell with their thread 2 is screwed in by into at least some the drillings 6 intervening, 3 screwing in instrument centered in the drilling into the preparatory basin bone. The Aussenscha3 CH 674,927 A5 le 1 becomes subsequently, gegebenenfa [Is zusätzlích embodied by bone screws 7. With a setting instrument, which intervenes in the drillings 17, the pan body 11 is then pressed in the correct situation of the extension 14 into the outer shell 1, whereby the two Konen 8 and 9 catch more ineìnander.