CH678146A5 - - Google Patents

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Publication number
CH678146A5
CH678146A5 CH4717/88A CH471788A CH678146A5 CH 678146 A5 CH678146 A5 CH 678146A5 CH 4717/88 A CH4717/88 A CH 4717/88A CH 471788 A CH471788 A CH 471788A CH 678146 A5 CH678146 A5 CH 678146A5
Authority
CH
Switzerland
Prior art keywords
shaft
profiles
hollow
hollow prosthesis
prosthesis
Prior art date
Application number
CH4717/88A
Other languages
German (de)
Inventor
Guenter Dr-Ing Bensmann
Original Assignee
Krupp Medizintechnik
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Krupp Medizintechnik filed Critical Krupp Medizintechnik
Publication of CH678146A5 publication Critical patent/CH678146A5/de

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral shafts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
    • A61F2002/30004—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis
    • A61F2002/30014—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis differing in elasticity, stiffness or compressibility
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30317—The prosthesis having different structural features at different locations within the same prosthesis
    • A61F2002/30324—The prosthesis having different structural features at different locations within the same prosthesis differing in thickness
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30451—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements soldered or brazed or welded
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30593—Special structural features of bone or joint prostheses not otherwise provided for hollow
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30602—Shaft made of a bundle of anchoring rods or bristles, e.g. fasciculate shaft
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/3094—Designing or manufacturing processes
    • A61F2/30942—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
    • A61F2002/30955—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques using finite-element analysis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3625—Necks
    • A61F2002/3631—Necks with an integral complete or partial peripheral collar or bearing shoulder at its base
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2220/0058—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements soldered or brazed or welded
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
    • A61F2250/0029—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in bending or flexure capacity
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
    • A61F2250/0036—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in thickness
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00011—Metals or alloys
    • A61F2310/00023—Titanium or titanium-based alloys, e.g. Ti-Ni alloys
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00011—Metals or alloys
    • A61F2310/00029—Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00011—Metals or alloys
    • A61F2310/00035—Other metals or alloys
    • A61F2310/00095—Niobium or Nb-based alloys
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00011—Metals or alloys
    • A61F2310/00035—Other metals or alloys
    • A61F2310/00131—Tantalum or Ta-based alloys

Description

1 1

CH 678 146 A5 CH 678 146 A5

2 2nd

Beschreibung description

Die Erfindung bezieht sich auf einen Prothesen-hohlschaft, dessen Biegesteifigkeit der des Knochens, für den er vorgesehen ist, angepasst werden kann. The invention relates to a prosthetic hollow shaft, the bending stiffness of which can be adapted to that of the bone for which it is intended.

Derzeit unterscheidet man bei der Endoprothetik zwischen zwei Befestigungsvarianten des Prothesenschaftes im Knochen. Entweder werden die Prothesen mit Hilfe eines Knochenzementes in der vorbereiteten Knochenhöhle befestigt oder es werden sogenannte Zementlosprothesen verwendet. At present, a distinction is made between two types of fastening of the prosthesis shaft in the endoprosthetics. Either the prostheses are fixed in the prepared bone cavity with the help of a bone cement or so-called cementless prostheses are used.

Bei der Zementiertechnik werden in der Regel gute Anfangserfolge erzielt, da der Zement sich der vorgearbeiteten Knochenhöhle sehr gut anpasst. Da der Knochenzement aber nach einer gewissen Zeit versprödet, lockern die Prothesenschäfte und müssen entfernt werden. With the cementing technique, good initial successes are usually achieved, since the cement adapts very well to the prepared bone cavity. However, since the bone cement becomes brittle after a certain time, the prosthetic sockets loosen and must be removed.

Diesem Nachteil versuchte man durch die Entwicklung von Zementlosprothesen zu begegnen. Bei der Zementlostechnik werden oberflächenstrukturierte Prothesenschäfte in die möglichst genau vorgearbeitete Knochenhöhle eingebracht und dort u.a. mittels Presssitz fixiert. Danach muss, um eine dauerhafte Fixierung der Prothese zu erhalten, der Knochen in die Oberflächenstruktur einwachsen. Da die Biegesteifigkeit eines Prothesenschaftes aber wesentlich grösser ist als die Biegesteifigkeit des Knochens, in den er implantiert wurde, treten bei Belastung des Prothesenhohlschaftes Relativbewegungen zwischen Knochen und Schaft auf, was zu seiner bindegewebigen Abscheidung und zu Lockerungen führt. Attempts have been made to counter this disadvantage by developing cementless prostheses. With cementless technology, surface-structured prosthetic sockets are inserted into the bone cavity, which has been prepared as precisely as possible, and there, among other things. fixed with a press fit. Afterwards, in order to permanently fix the prosthesis, the bone has to grow into the surface structure. However, since the bending stiffness of a prosthetic socket is considerably greater than the bending stiffness of the bone into which it was implanted, relative movements occur between the bone and the socket when the hollow prosthesis shaft is loaded, which leads to its connective tissue separation and loosening.

Aufgabenstellung der vorliegenden Erfindung ist es, die Nachteile der bekannten Zèmentlos-Prothe-senschäfte durch einfache, konstruktive Änderungen zu beseitigen. The object of the present invention is to eliminate the disadvantages of the known cementless prosthesis shafts by simple, constructive changes.

Erfindungsgemäss wird diese Aufgabe mittels eines Prothesenhohlschaftes nach Anspruch 1 gelöst. According to the invention, this object is achieved by means of a hollow prosthesis shaft according to claim 1.

Vorgeschlagen wird ein aus Profilen in Fachwerkstruktur aufgebauter Prothesenhohlschaft. Besonders vorteilhaft ist hierbei die Verwendung der Profile in Form von Rundprofilen. Durch entsprechende Anordnung der Profile können verschiedene Querschnittsformen des Prothesenschaftes realisiert werden. In besonderen Fällen können auch Verstrebungen im Hohlschaft vorteilhaft sein. A prosthetic hollow shaft made up of profiles in a framework structure is proposed. The use of the profiles in the form of round profiles is particularly advantageous here. By arranging the profiles appropriately, different cross-sectional shapes of the prosthesis socket can be realized. In special cases, struts in the hollow shaft can also be advantageous.

Die Ausbildung des Hohlschaftes als Fachwerkstruktur hat ausserdem den Vorteil, dass durch Auswahl der Profilformen und -stärken und durch Anordnung und Dimensionierung der Verstrebungen die Biegesteifigkeit des Schaftes der Biegesteifigkeit des Knochens an jeder Stelle weitgehend angepasst werden kann. Dadurch werden die bisher bei Belastung des Systems Knochen/Prothesen-schaft auftretenden Relativbewegungen vermieden. The formation of the hollow shaft as a framework structure also has the advantage that the bending stiffness of the shaft can be largely adapted to the bending stiffness of the bone at any point by selecting the profile shapes and thicknesses and by arranging and dimensioning the struts. This avoids the relative movements that previously occurred when the bone / prosthesis shaft system was loaded.

Korrekturen der Biegesteifigkeit des Schaftes können durch Hinzufügen oder Entfernen der Verstrebungen bzw. durch Austausch von Profilen mit verschiedener Profilstärke erreicht werden. Die Berechnung der Biegesteifigkeit solcher Prothesenschäfte ist leicht z.B. mit der Methode der Fini-ten-Elemente möglich. Corrections to the bending stiffness of the shaft can be achieved by adding or removing the struts or by exchanging profiles with different profile thicknesses. The calculation of the bending stiffness of such prosthetic sockets is easy e.g. possible with the method of finite elements.

Besonders vorteilhaft ist es, wenn durch ausreichende Dimensionierung der Zwischenräume zwischen den Verstrebungen im Hohlschaft dafür Sorge getragen wird, dass die in den Schaft eingebrachte Knochenspongiosa anwächst und auf Dauer ernährt werden kann. Im Unterschied zur bisherigen Zementlosprothetik muss der Knochen nicht in die Oberflächenstruktur des Prothesenschaftes einwachsen, sondern der Knochen d.h. die Knochenspongiosa werden bereits während der Operation dahin gebracht, wo er benötigt wird. It is particularly advantageous if, by adequate dimensioning of the spaces between the struts in the hollow shaft, care is taken to ensure that the bone cancellous bone introduced into the shaft grows and can be nourished in the long term. In contrast to previous cementless prosthetics, the bone does not have to grow into the surface structure of the prosthetic socket, but the bone i.e. The bone cancellous bone is brought to where it is needed during the operation.

Grundsätzlich ist es möglich, den Prothesenschaft in Fachwerkstruktur durch Aneinander-schweissen von Profilen aus bekannten Titanlegierungen aufzubauen. Es ist jedoch vorteilhafter, Profile aus kohlenstoffarmen CoCrMo-Legierun-gen zu verwenden, da diese sich mit geringem Aufwand schweissen lassen. Basically, it is possible to build up the prosthesis stem in a framework structure by welding profiles made of known titanium alloys together. However, it is more advantageous to use profiles made of low-carbon CoCrMo alloys, since these can be welded with little effort.

Für die Herstellung einer Gelenkprothese wird an den Prothesenschaft mit einem Ansatz zum Aufsetzen einer Gelenkkugel an den Prothesenhohlschaft angeschweisst. Durch die verbleibende Öffnung kann zerkleinerte Knochenspongiosa eingebracht werden. For the production of a joint prosthesis, an attachment for attaching a joint ball to the prosthesis hollow shaft is welded to the prosthesis socket. Crushed bone cancellous bone can be inserted through the remaining opening.

In der Zeichnung wird in zwei Ansichten ein Ausführungsbeispiel des Gegenstandes der Erfindung dargestellt. In the drawing, an embodiment of the object of the invention is shown in two views.

Fig. 1 zeigt den Prothesenhohlschaft 1 in Seitenansicht mit angeschweisstem Kragen 2 und einem Ansatz 3 zum Aufsetzen einer Gelenkkugel. Die Seitenwand 4 besteht aus Verstrebungen in Fachwerkstruktur. Fig. 1 shows the hollow prosthesis shaft 1 in a side view with a welded collar 2 and a shoulder 3 for attaching a joint ball. The side wall 4 consists of struts in a framework structure.

Fig. 2 zeigt die Ansicht II-II der Prothese in Fig. 1 mit der Fachwerkstruktur, aber ohne den Ansatz 3. FIG. 2 shows the view II-II of the prosthesis in FIG. 1 with the framework structure, but without the attachment 3.

Claims (1)

Patentansprüche Claims 1. Prothesenhohlschaft, dadurch gekennzeichnet, dass der Schaft in Form eines Fachwerkes aus Profilen aufgebaut ist.1. hollow prosthesis shaft, characterized in that the shaft is constructed in the form of a framework from profiles. 2. Prothesenhohlschaft nach Anspruch 1, dadurch gekennzeichnet, dass das Fachwerk des Schaftes aus Rundprofilen aufgebaut ist.2. Prosthetic hollow shaft according to claim 1, characterized in that the framework of the shaft is constructed from round profiles. 3. Prothesenhohlschaft nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, dass im Inneren des Schaftes Verstrebungen angeordnet sind.3. hollow prosthesis shaft according to claims 1 and 2, characterized in that struts are arranged in the interior of the shaft. 4. Prothesenhohlschaft nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Profile derart dimensioniert und angeordnet sind, dass der Schaft eine über seine Länge unterschiedliche Biegesteifigkeit aufweist.4. Hollow prosthesis shaft according to one of claims 1 to 3, characterized in that the profiles are dimensioned and arranged such that the shaft has a different bending stiffness over its length. 5. Prothesenhohlschaft nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Profile aus CoCrMo, Titanlegierungen, Tantal oder Niob bestehen.5. Hollow prosthesis stem according to one of claims 1 to 4, characterized in that the profiles consist of CoCrMo, titanium alloys, tantalum or niobium. 6. Prothesenhohlschaft nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Profile aus CoCrMo bestehen.6. hollow prosthesis shaft according to one of claims 1 to 4, characterized in that the profiles consist of CoCrMo. 7. Prothesenhohlschaft nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Profile in Fachwerkstruktur miteinander verschweisst sind.7. hollow prosthesis shaft according to one of claims 1 to 6, characterized in that the profiles are welded together in the framework structure. 8. Prothesenhohlschaft nach einem der Ansprü-8. Hollow prosthesis shaft according to one of the claims 55 1010th 1515 2020th 2525th 3030th 3535 4040 4545 5050 5555 6060 6565 33rd CH678146A5CH678146A5 che 1 bis 7, dadurch gekennzeichnet, dass die Zwischenräume zwischen den Profilen so ausreichend bemessen sind, dass die in den Hohlschaft eingebrachte Spongiosa in direkten Kontakt mit der Spon-giosa des Knochens treten kann.che 1 to 7, characterized in that the spaces between the profiles are dimensioned sufficiently so that the cancellous bone inserted into the hollow shaft can come into direct contact with the cancellous bone. 9. Prothesenhohlschaft nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass der Prothesenhohlschaft mit einem Ansatz zum Aufsetzen einer Gelenkkugel durch Schweissen verbunden ist.9. hollow prosthesis shaft according to one of claims 1 to 8, characterized in that the hollow prosthesis shaft is connected by welding to an attachment for mounting a joint ball. 10. Verfahren zur Herstellung eines Prothesenhohlschaftes nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die Profile durch Schweissen verbunden werden.10. A method for producing a hollow prosthesis stem according to one of claims 1 to 9, characterized in that the profiles are connected by welding. 55 1010th 1515 2020th 2525th 3030th 3535 4040 4545 5050 5555 6060 6565 33rd
CH4717/88A 1987-12-21 1988-12-21 CH678146A5 (en)

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DE3743329A DE3743329C1 (en) 1987-12-21 1987-12-21 Endoprosthesis hollow stem for cement-free implantation

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CH678146A5 true CH678146A5 (en) 1991-08-15

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4102509C2 (en) * 1991-01-29 1996-06-20 Peter Brehm Knee joint endoprosthesis
DE4213598A1 (en) * 1992-04-24 1993-10-28 Klaus Draenert Cementless femoral prosthesis component and method of manufacture
DE4223373C2 (en) * 1992-07-16 1996-07-11 Krupp Medizintechnik Endoprosthesis socket for knee joints and process for its manufacture
IT1273246B (en) * 1994-02-04 1997-07-07 Samo Spa LIGHTENED INTERNAL ARTICULAR PROSTHESIS
DE19501995A1 (en) * 1995-01-11 1996-07-18 Effner Biomet Gmbh Endoprosthesis
FR2748201B1 (en) * 1996-05-03 1998-11-27 Thierry Chataigner PROSTHESIS OF THE METALLURGICAL PROSTHETIC IMPLANT TYPE
DE20303076U1 (en) * 2003-02-26 2003-04-30 Aesculap Ag & Co Kg Extension sleeve for a modular joint prosthesis
CN101584614B (en) * 2009-07-02 2011-06-15 北京市春立正达医疗器械股份有限公司 Femur upper segment hip-joint prosthesis
US10278823B1 (en) * 2018-04-18 2019-05-07 ZSFab, Inc. Lightweight femoral stem for hip implants

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2711551C2 (en) * 1977-03-17 1983-11-17 Chas. A. Blatchford & Sons Ltd., Basingstoke, Hampshire Load-bearing part of a leg or arm prosthesis and process for its manufacture
FR2438468A1 (en) * 1978-10-11 1980-05-09 Tornier Sa Ets IMPROVEMENTS ON HIP PROSTHESES
DE3028393A1 (en) * 1980-07-26 1982-02-11 Efstathios Thessaloniki Koutrolikos Surgical implant used as femoral endoprosthesis - has neck portion formed by medial and lateral stems joined by transverse rib
DE3120147A1 (en) * 1981-05-18 1982-12-09 Mecron Medizinische Produkte Gmbh, 1000 Berlin "HIP JOINT PROSTHESIS"

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