Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Patent
1988-04-29
1989-11-28
Apley, Richard J.
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
A61F 234
Patent
active
048834890
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a pelvis part prosthesis for replacement of a pelvis section in the area of the hip joint, comprising a shell portion for reception of a hip joint ball and connection elements joined thereto for securing the prosthesis in the area of pubic ilium.
A pelvic section prosthesis which is constructed in accordance with a modular principle, is disclosed in the German specification as laid open DE No. - 28 09 556 B2. It comprises a substantially block-shaped principal member having a reception space for the hip joint socket and several connection surfaces provided with holes and several pin-shaped connection elements, which are fastened in the holes on the one hand, and are connected on the other hand to the remanent pelvic bone material of the patient.
The principal member of the prosthesis is a comparatively large block member since it has to have several holes for the pin-shaped connection elements so that these elements may be secured in a selected hole depending on the conditions encountered with the patient. Furthermore, the connection elements inserted into the holes are fastened to the principal member by means of screws, for which purpose supplemental tapped holes have to be provided in the principal member. Although a whole prosthesis adapted in its configuration to the prevailing requirements in accordance with the conditions encountered with the patient may be put together with these prosthesis elements, this procedure is onerous and time-consuming, because the connection elements are not as readily accessible with the principal member in the implanted condition. If the prosthesis elements selected are assembled before the implanting operation, an optimum position of the elements of the prosthesis with respect to each other and thus an optimum functionality of the whole prosthesis in the body of the patient cannot always be assured. The reason is because the principal member is anchored on the pelvic bone material by means of at least three connection elements. With such connections, it is uncertain whether each connection element can be anchored reliably in the pelvic bone material because of its unfavourable structure after bone resection. Furthermore, the tapped holes and the fastening screws represent a supplemental production cost in the manufacture of the prosthesis.
The object of the invention consists in the improvement of an endoprosthesis of the kind defined in the foregoing which assures that the prosthesis may be implanted rapidly and in simple manner as well as with the result of an optimum functionality in the implanted state.
The resolution of the problem derives from the endoprosthesis which and is characterized in that the shell portion has two integrally formed appendices comprising a reception bore in each case, and that the connection elements joined to the appendices each have a pin and are installed with this pin in the reception bores in a self-locking tight fit.
In a preferred embodiment of the endoprosthesis according to the invention, each tight fitting joint between the hemispherically formed shell portion and the connection elements consists of a taper joint. The metal connection elements have spatially curved plate elements comprising holes for connection by means of screws on the corresponding bone regions. The bone-side material layer of the shell portion as well as of the connection elements may complementally be formed as an open-celled structure for the growing-in of bone material.
The endoprosthesis according to the invention, whereof the parts are available in different sizes for utilization of an anatomically individually adapted prosthesis, may be implanted rapidly with an uncomplicated manner, because the final immobilization of the connection elements, may be performed by means of a self-locking tight fit without protracted assembling operations and may in each case be carried out by means of a sharp blow. The prosthesis elements may furthermore be implanted more easily in optimum manner as regards position based on no more than two conne
REFERENCES:
patent: 4743262 (1988-05-01), Tronzo
Grundei Hans
Heinhuber Bernd
Hipp Erwin
Apley Richard J.
Isabella David J.
S&G Implants GmbH
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