AT390730B - BONE IMPLANT APPLICATIONS FOR THE PRODUCTION OF A SURFACE STRUCTURE FOR METAL ANCHORING ELEMENTS OF BONE IMPLANTS - Google Patents

BONE IMPLANT APPLICATIONS FOR THE PRODUCTION OF A SURFACE STRUCTURE FOR METAL ANCHORING ELEMENTS OF BONE IMPLANTS Download PDF

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Publication number
AT390730B
AT390730B AT151784A AT151784A AT390730B AT 390730 B AT390730 B AT 390730B AT 151784 A AT151784 A AT 151784A AT 151784 A AT151784 A AT 151784A AT 390730 B AT390730 B AT 390730B
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Austria
Prior art keywords
bone
surface structure
support
wave
anchoring elements
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AT151784A
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German (de)
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ATA151784A (en
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Sulzer Ag
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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
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30907—Nets or sleeves applied to surface of prostheses or in cement
    • 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
    • A61F2/367—Proximal or metaphyseal parts of 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
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30112—Rounded shapes, e.g. with rounded corners
    • A61F2002/30136—Rounded shapes, e.g. with rounded corners undulated or wavy, e.g. serpentine-shaped or zigzag-shaped
    • 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
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30772—Apertures or holes, e.g. of circular cross section
    • A61F2002/30784—Plurality of holes
    • A61F2002/30785—Plurality of holes parallel
    • 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
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30772—Apertures or holes, e.g. of circular cross section
    • A61F2002/30784—Plurality of holes
    • A61F2002/30787—Plurality of holes inclined obliquely with respect to each other
    • 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
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A61F2002/30899—Protrusions pierced with apertures
    • A61F2002/30902—Protrusions pierced with apertures laterally or radially
    • 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
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30907—Nets or sleeves applied to surface of prostheses or in cement
    • A61F2002/30909—Nets
    • 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
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30907—Nets or sleeves applied to surface of prostheses or in cement
    • A61F2002/30909—Nets
    • A61F2002/30914—Details of the mesh structure, e.g. disposition of the woven warp and weft wires
    • 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
    • A61F2002/30968—Sintering
    • 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
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2002/4631—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor the prosthesis being specially adapted for being cemented
    • 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
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0004—Rounded shapes, e.g. with rounded corners

Description

Nr. 390 730No. 390 730

Die Erfindung betrifft Knochenimplantatauflagen zur Erzeugung einer Oberflächenstruktur für metallene Verankerungselemente von Knochenimplantaten, welche Auflagen mindestens einen Teil der Oberfläche des Verankerungselementes bedecken und mit dieser über eine Anzahl Haftstellen verbunden sind, wobei die Summe der Haftstellen eine Haftfestigkeit ergibt, die mindestens der Belastbarkeit des Knochens entspricht. 5 Um die Haftung eines Implantates in einem Knochen oder einem Knochenzementbett zu verbessern, ist es bekannt, die Oberfläche des Implantates mit einer Struktur zu versehen. Für metallene Verankerungselemente besteht eine bevorzugte Art einer solchen Oberflächenstruktur im - gegebenenfalls teilweise in den Grundköiper versenkte - metallischen Auflagen in der Form von Lochplatten (EP-A-0 038 902) oder Drahtgeweben (GB-A-2059267). Die Verbindung der einzelnen Auflageteile untereinander und mit der Grundsubstanz wird dabei 10 durch metallurgische - z. B. geschweißte oder gelötete - Verbindungen an einzelnen Haftstellen gewährleistet.The invention relates to bone implant supports for producing a surface structure for metal anchoring elements of bone implants, which overlays cover at least a part of the surface of the anchoring element and are connected to it via a number of adhesion points, the sum of the adhesion points resulting in an adhesive strength that corresponds at least to the resilience of the bone . 5 In order to improve the adhesion of an implant in a bone or a bone cement bed, it is known to provide the surface of the implant with a structure. For metal anchoring elements, a preferred type of such a surface structure consists of metallic supports, optionally partially sunk into the base body, in the form of perforated plates (EP-A-0 038 902) or wire mesh (GB-A-2059267). The connection of the individual support parts with each other and with the basic substance is 10 by metallurgical - z. B. welded or soldered - connections at individual detention points guaranteed.

Bekanntlich ist die Operationsöffnung, in die die Verankerungselemente eingesetzt oder eingetrieben werden, im allgemeinen kein Hohlraum mit einer, an die Form des Verankerungselementes ideal angepaßten geometrischen Form und glatten Wänden, sondern weist häufig örtliche Unregelmäßigkeiten, Kanten und Vorsprünge auf. Weiterhin muß bekanntlich für eine gute Verankerung zwischen Implantat und Wand des 15 Knochens oder des Zementbettes eine möglichst große Kontaktfläche gegeben sein.As is known, the surgical opening into which the anchoring elements are inserted or driven is generally not a cavity with a geometric shape and smooth walls that is ideally matched to the shape of the anchoring element, but often has local irregularities, edges and projections. Furthermore, as is well known, the largest possible contact area must be provided for good anchoring between the implant and the wall of the bone or the cement bed.

In der Praxis hat sich nun gezeigt, daß die beschriebenen bekannten Oberflächenstrukturen häufig eine zu geringe elastische Verformbarkeit besitzen, um sich örtlich beim Eintreiben weitgehend elastisch zu verformen und nach dem Vorbeigleiten an einer solchen Unregelmäßigkeit wieder an die Wand anzulegen.In practice, it has now been shown that the known surface structures described often have insufficient elastic deformability in order to deform locally elastically to a large extent when being driven in and, after sliding past such an irregularity, to put it back on the wall.

Aufgabe der Erfindung ist es deshalb, für metallene Verankerungselemente eine Oberflächenstruktur zu 20 schaffen, die den Unregelmäßigkeiten der Hohlraumwände in erheblichem Masse elastisch nachgibt, ohne daß dabei ins Gewicht fallende bleibende Verformungen entstehen, durch die die Kontaktfläche in der Endlage des Elementes unzulässig verringert ist.The object of the invention is therefore to provide a surface structure for metal anchoring elements, which yields to a considerable extent elastically to the irregularities of the cavity walls without causing significant permanent deformations by which the contact surface in the end position of the element is inadmissibly reduced.

Diese Aufgabe wird nach der vorliegenden Erfindung dadurch gelöst, daß die Auflage aus dünnen, wellenförmigen Blechen besteht, in deren Wellenflanken oder -bergen Durchbrüche verteilt sind. 25 Gegenüber geflochtenen Drähten oder Lochplatten haben wellenförmig geformte, dünne Bleche, besonders imThis object is achieved according to the present invention in that the support consists of thin, corrugated sheets, in the wave flanks or mountains breakthroughs are distributed. 25 Compared to braided wires or perforated plates, they have wavy, thin sheets, especially in

Bereich ihrer Wellenberge, vor allem in Richtung quer zu den Wellenkämmen eine hohe elastische Verformbarkeit. Sie können daher Unebenheiten an den Wänden relativ leicht ausweichen. Darüberhinaus bietet die Wellenform einwachsendem Gewebe eine relativ große Kontaktfläche, wobei die Durchbrüche ein Einwachsen von Gewebe bzw. ein Eindringen von Knochenzement in die durch die Wellenform entstehenden Hohliäume 30 ermöglichen.Area of their wave crests, especially in the direction transverse to the wave crests, a high elastic deformability. You can therefore avoid bumps on the walls relatively easily. In addition, the waveform ingrown tissue offers a relatively large contact area, the openings allowing tissue to grow in or bone cement to penetrate into the cavities 30 formed by the waveform.

Als zweckmäßig hat es sich erwiesen, wenn die Wellenkämme mindestens im wesentlichen in Einsetzrichtung des Verankerungselementes verlaufen, die Wellenzüge also senkrecht dazu angeordnet sind.It has proven to be expedient if the shaft crests run at least substantially in the direction of insertion of the anchoring element, that is to say the wave trains are arranged perpendicularly thereto.

Wie für die Verankerungselemente selbst, können auch für die Auflagen alle in der Implantat-Technik üblichen Metalle und Metall-Legierungen verwendet werden, sofern sie für die Blechfäbrikation geeignet sind. 35 Dabei ist es möglich, im individuellen Fall Verankerungselemente und Auflagen aus dem gleichen oder unterschiedlichen Werkstoffen herzustellen.As for the anchoring elements themselves, all metals and metal alloys customary in implant technology can also be used for the supports, provided they are suitable for sheet metal fabrication. 35 It is possible to manufacture anchoring elements and supports from the same or different materials in individual cases.

Im folgenden wird die Erfindung anhand von Ausführungsbeispielen im Zusammenhang mit der Zeichnung näher erläutertThe invention is explained in more detail below on the basis of exemplary embodiments in conjunction with the drawing

Fig. 1 zeigt schematisch eine Aufsicht auf das proximale Ende eines Schaftes einer Hüftgelenkprothese; 40 Fig. 2 ist in größerem Maßstab ein Schnitt (Π-ΙΙ) von Fig. 1;1 schematically shows a plan view of the proximal end of a shaft of a hip joint prosthesis; 40 Fig. 2 is a section on a larger scale (Π-1) of Fig. 1;

Fig. 3 und 4 stellen in gleicher Darstellung wie Fig. 2 weitere Ausführungsbeispiele dar.3 and 4 represent further exemplary embodiments in the same representation as FIG. 2.

Bei dem in Fig. 1 skizzierten Schaft handelt es sich um einen bekannten - siehe z. B. EP-A1-0 058 745 -, blattartigen Geradschaft, der in der Grundform seines Querschnitts ein relativ schmales Rechteck bildet Bei in den Knochen eingesetzter Prothese sind seine Längs- oder Blattseiten (2) mit ihren Flächennormalen im wesentlichen 45 nach anterior bzw. posterior gerichtet und durch eine laterale und mediale Schmalseite zu dem Rechteckquerschnitt ergänzt1 is a known one - see e.g. B. EP-A1-0 058 745 -, leaf-like straight shaft, which forms a relatively narrow rectangle in the basic shape of its cross section. When the prosthesis is inserted into the bone, its longitudinal or leaf sides (2) with their surface normals are essentially 45 anteriorly or directed posteriorly and supplemented by a lateral and medial narrow side to the rectangular cross section

Der gezeigte Schaft (1) trägt einen zapfenarügen Prothesenhals (3), auf den der nicht dargestellte Gelenkkopf aufgesteckt istThe shaft (1) shown carries a cone-like prosthesis neck (3) on which the joint head, not shown, is attached

Die Flächen der Blattseiten (2) sind teilweise mit einer Auflage (4) bedeckt, die eine Oberflächenstruktur der 50 Blattseiten (2) bildet. Erfindungsgemäß besteht die Auflage (4) aus einem wellenförmig geformten Blech, das durch punktförmige metallurgische Verbindungen (5), beispielsweise Schweiß-Stellen, mit den Außenflächen seiner Talsohlen an die Blattseite (2) angeheftet ist Selbstverständlich ist es auch möglich, das Anhaften der Auflage (4) auf der Oberfläche (2) durch Klebe- oder mechanische Verbindungen sicherzustellen.The surfaces of the leaf sides (2) are partially covered with a support (4) which forms a surface structure of the 50 leaf sides (2). According to the invention, the support (4) consists of a wave-shaped sheet which is attached to the leaf side (2) by punctiform metallurgical connections (5), for example welding points, with the outer surfaces of its valley bottoms. It is of course also possible to adhere the support (4) on the surface (2) by adhesive or mechanical connections.

Die Auflage (4) kann dabei unter Umständen teilweise in der Blattseite (2) versenkt sein (Fig. 3). Die 55 Ausrichtung des gewellten Bleches erfolgt dabei mit Vorteil so, daß seine Kämme (6) bzw. Täler (7) in Einsetzrichtung der Prothese, also in Fig. 1 in Richtung der Achse des Schaftes (1), verlaufen. Die "Gesamtamplitude" des Wellenzuges, d. h. die Höhe (H) (Fig. 2) von Spitze zu Spitze, wird bei den üblichen Abmessungen von Endoprothesen vorzugsweise im Bereich von 1 bis 4 mm liegen.The support (4) can in some cases be partially sunk in the sheet side (2) (Fig. 3). The 55 alignment of the corrugated sheet is advantageously carried out in such a way that its ridges (6) or valleys (7) run in the direction of insertion of the prosthesis, that is to say in FIG. 1 in the direction of the axis of the shaft (1). The " total amplitude " the wave train, d. H. the height (H) (FIG. 2) from tip to tip will preferably be in the range from 1 to 4 mm in the usual dimensions of endoprostheses.

Die Seitenflanken (Fig. 2) oder die Kämme (6) (Fig. 3 und 4) der Wellenzüge der Auflagen (4) sind mit 60 Durchbrüchen (8) versehen, die beispielsweise aus Bohrungen (Fig. 2 und 4) bestehen oder durch partielles Abfräsen der Wellenkämme (6) (Fig. 3) hergestellt werden. Die Durchbrüche (8) gestatten - je nach Art der Verankerung des Schaftes ohne oder mit Knochenzement - ein Einwachsen von Knochengewebe oder Eindringen -2-The side flanks (Fig. 2) or the combs (6) (Fig. 3 and 4) of the wave trains of the pads (4) are provided with 60 openings (8), which consist, for example, of holes (Fig. 2 and 4) or through partial milling of the wave crests (6) (Fig. 3) are produced. The openings (8) allow - depending on the type of anchoring of the shaft with or without bone cement - ingrowth of bone tissue or penetration -2-

Claims (2)

Nr. 390 730 von Knochenzement in das Innere der durch die Wellenzüge gebildeten Hohlräume. Zur Ausbildung einer Oberflächenstruktur sind Teile der Oberflächen (2) von metallenen Schäften (1) für Endoprothesen mit einer Auflage (4) versehen, die von einem wellenförmigen Blech gebildet werden. Durchbrüche (8) in den Flanken oder in den Wellenkämmen (6) gestatten ein Einwachsen von Gewebe oder ein Eindringen von Knochenzement in die von den Wellenzügen gebildeten Hohlräume. Die Befestigung der Auflage (4) auf der Schaftoberfläche (2) erfolgt beispielsweise über punktförmige metallurgische Verbindungen (5), z. B. über Schweißstellen. Eine Auflage (4) aus relativ dünnem Blech ermöglicht der Oberflächenstruktur beim Einsetzen der Prothese in den Knochen Unebenheiten der Wand des operativ ausgeräumten Knochenhohlraums elastisch nachzugeben und sich anschließend wieder an die Wand anzulegen, so daß die Kontaktfläche zwischen Knochen und Schaftoberfläche (2) nicht durch plastische Verformungen der Oberflächenstruktur verringert wird. PATENTANSPRÜCHE 1. Knochenimplantatauflagen zur Erzeugung einer Oberflächenstruktur für metallene Verankerungselemente von Knochenimplantaten, welche Auflagen mindestens einen Teil der Oberfläche des Verankerungselementes bedecken und mit dieser über eine Anzahl Haftstellen verbunden sind, wobei die Summe der Haftstellen eine Haftfestigkeit ergibt, die mindestens der Belastbarkeit des Knochens entspricht, dadurch gekennzeichnet, daß die Auflage (4) aus dünnen, wellenförmigen Blechen besteht, in deren Wellenflanken oder -bergen Durchbrüche (8) verteilt sind.No. 390 730 of bone cement into the interior of the cavities formed by the wave trains. To form a surface structure, parts of the surfaces (2) of metal shafts (1) for endoprostheses are provided with a support (4) which is formed by a corrugated sheet. Breakthroughs (8) in the flanks or in the wave crests (6) allow tissue to grow in or bone cement to penetrate into the cavities formed by the wave trains. The attachment of the support (4) on the shaft surface (2) takes place, for example, via punctiform metallurgical connections (5), e.g. B. about welds. A support (4) made of relatively thin sheet metal allows the surface structure when the prosthesis is inserted into the bones to give way to unevenness in the wall of the surgically cleared bone cavity and then to rest against the wall, so that the contact surface between the bone and the shaft surface (2) does not go through plastic deformation of the surface structure is reduced. PATENT CLAIMS 1. Bone implant supports for producing a surface structure for metal anchoring elements of bone implants, which overlays cover at least a part of the surface of the anchoring element and are connected to it via a number of adhesion points, the sum of the adhesion points resulting in an adhesive strength that corresponds at least to the resilience of the bone , characterized in that the support (4) consists of thin, corrugated sheets, in the wave flanks or crests of openings (8) are distributed. 2. Knochenimplantatauflagen nach Anspruch 1, dadurch gekennzeichnet, daß die Wellenkämme (6) mindestens im wesentlichen in Einsetzrichtung des Verankerungselementes (1) verlaufen. Hiezu 1 Blatt Zeichnung -3-2. Bone implant supports according to claim 1, characterized in that the wave crests (6) run at least substantially in the direction of insertion of the anchoring element (1). For this 1 sheet drawing -3-
AT151784A 1983-06-24 1984-05-09 BONE IMPLANT APPLICATIONS FOR THE PRODUCTION OF A SURFACE STRUCTURE FOR METAL ANCHORING ELEMENTS OF BONE IMPLANTS AT390730B (en)

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CH344283A CH658988A5 (en) 1983-06-24 1983-06-24 REQUIREMENTS FOR METAL ANCHORING ELEMENTS OF BONE IMPLANTS, INTENDED TO CREATE A SURFACE STRUCTURE.

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AT390730B true AT390730B (en) 1990-06-25

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SE450623B (en) * 1984-11-07 1987-07-13 Dan Lundgren ELEMENTS OF CONTROLLED TISSUE INVESTMENT IN SURGICAL INTERVENTIONED AREAS
CH665349A5 (en) * 1985-01-08 1988-05-13 Sulzer Ag METALLIC BONE IMPLANT.
DE3627097A1 (en) * 1986-08-09 1988-02-18 S & G Implants Gmbh HANDLE FOR JOINT ENDOPROTHESES
JPH0616800B2 (en) * 1986-12-05 1994-03-09 春幸 川原 Intraosseous implant member with mesh structure
US5139528A (en) * 1988-02-26 1992-08-18 Sulzer Brothers Limited Method of securing a mesh to a metal substrate for a bone implant
DE8808701U1 (en) * 1988-07-04 1989-08-03 Mecron Medizinische Produkte Gmbh, 1000 Berlin, De
DE19545470A1 (en) * 1995-12-06 1997-07-31 Matthias Dr Med Honl End prosthesis or implant surface
DE19614949A1 (en) * 1996-04-16 1997-10-23 Horst Broziat Bone implant
IT1311000B1 (en) * 1999-03-03 2002-02-27 Lima Lto S P A HIP PROSTHESIS.
GB0325647D0 (en) * 2003-11-03 2003-12-10 Finsbury Dev Ltd Prosthetic implant
EP1697080A4 (en) * 2003-12-02 2008-11-12 Advanced Surfaces Process Biocompatible surface modifications for metal orthopedic implants
GB201007166D0 (en) * 2010-04-29 2010-06-09 Finsbury Dev Ltd Prosthesis
GB201118937D0 (en) 2011-11-02 2011-12-14 Finsbury Dev Ltd Prothesis

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DE7619986U1 (en) * 1900-01-01 Ceraver S.A. Paris
SE403884B (en) * 1975-04-22 1978-09-11 Branemark Per Ingvar FOR PARTY AT NAMES INTENDED PROTEST SPECIALLY INTENDED NOT TO BE IN AN ARTIFICIAL JOINT
SE408013B (en) * 1977-09-27 1979-05-14 Branemark Per Ingvar IN ONE BENURTAG, USABLE CARRIER ELEMENT FOR RECORDING A PROSTHES
NL7907231A (en) * 1979-09-28 1981-03-31 Leuven Res & Dev Vzw COMPOSITE MATERIAL FOR PROSTHESIS.
CH645265A5 (en) * 1980-04-29 1984-09-28 Sulzer Ag ANCHORING ELEMENT OF A BONE IMPLANT.
CH648748A5 (en) * 1981-02-19 1985-04-15 Sulzer Ag STRAIGHT, LEAF-LIKE SHAFT OF A JOINT OPROTHESIS.

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ATA151784A (en) 1989-12-15
DE3416471C2 (en) 1985-10-31
DE3416471A1 (en) 1985-01-10
FR2548889B1 (en) 1986-04-18
CH658988A5 (en) 1986-12-31

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