WO2007124607A1 - Schaft für gelenkprothese - Google Patents

Schaft für gelenkprothese Download PDF

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Publication number
WO2007124607A1
WO2007124607A1 PCT/CH2007/000198 CH2007000198W WO2007124607A1 WO 2007124607 A1 WO2007124607 A1 WO 2007124607A1 CH 2007000198 W CH2007000198 W CH 2007000198W WO 2007124607 A1 WO2007124607 A1 WO 2007124607A1
Authority
WO
WIPO (PCT)
Prior art keywords
shaft
longitudinal bore
joint prosthesis
retention
retention element
Prior art date
Application number
PCT/CH2007/000198
Other languages
English (en)
French (fr)
Inventor
Laszlo Prezmecky
Original Assignee
Laszlo Prezmecky
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 Laszlo Prezmecky filed Critical Laszlo Prezmecky
Publication of WO2007124607A1 publication Critical patent/WO2007124607A1/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
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    • 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
    • A—HUMAN NECESSITIES
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    • 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
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    • A61F2/40—Joints for shoulders
    • A61F2/4059—Humeral shafts
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    • 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
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    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30112—Rounded shapes, e.g. with rounded corners
    • A61F2002/30113—Rounded shapes, e.g. with rounded corners circular
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    • A61F2002/30317—The prosthesis having different structural features at different locations within the same prosthesis
    • A61F2002/30326—The prosthesis having different structural features at different locations within the same prosthesis differing in height or in length
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    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30405—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by screwing complementary threads machined on the parts themselves
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    • 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
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    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30476—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism
    • A61F2002/30507—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism using a threaded locking member, e.g. a locking screw or a set screw
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    • A61F2/02—Prostheses implantable into the body
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    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
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    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30561—Special structural features of bone or joint prostheses not otherwise provided for breakable or frangible
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    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
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    • A61F2/02—Prostheses implantable into the body
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    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
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    • 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
    • A61F2230/0006—Rounded shapes, e.g. with rounded corners circular
    • 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
    • A61F2230/0017—Angular shapes
    • 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
    • A61F2230/0063—Three-dimensional shapes
    • A61F2230/0069—Three-dimensional shapes cylindrical
    • 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
    • A61F2250/0037—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 height or in length
    • 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
    • A61F2310/00059—Chromium or Cr-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
    • A61F2310/00179—Ceramics or ceramic-like structures
    • A61F2310/00185—Ceramics or ceramic-like structures based on metal oxides
    • A61F2310/00203—Ceramics or ceramic-like structures based on metal oxides containing alumina or aluminium oxide
    • 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
    • A61F2310/00179—Ceramics or ceramic-like structures
    • A61F2310/00293—Ceramics or ceramic-like structures containing a phosphorus-containing compound, e.g. apatite
    • 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
    • A61F2310/00329—Glasses, e.g. bioglass

Definitions

  • the present invention relates to a shaft for a joint prosthesis according to the preamble of claim 1.
  • joint prostheses and also shanks for joint prostheses such as hip joint prostheses, or shoulder or knee prostheses.
  • the prostheses can be roughly classified into two types, those implanted without bone cement and those implanted with bone cement.
  • a jaw implant which has retention elements, which are insertable into the implant and spreadable there. Important in this jaw implant is that the two-part retention element is held by a locking screw which is secured by a threaded shaft.
  • the embodiment relates to the shaft of a hip joint prosthesis, but it could just as well be a shaft for another prosthesis such as shoulder joint prosthesis or others.
  • FIG. 1 shows a longitudinal section of a shaft of a hip joint prosthesis during implantation
  • FIG. 2 shows the shaft of FIG. 1 in the fully implanted state
  • FIG. 5 is a section along the line VV in FIG. 2.
  • FIG. Fig. 1 shows the shaft 1 of a hip joint prosthesis, which has a shaft portion 2 and an angled neck 3, on which a joint ball 4 is attached.
  • the materials are known per se and may be known chromium-cobalt-steel alloys, while the ball joint may be either polyethylene or alumina ceramic.
  • the shaft 1 is inserted in a femur, the femur 5, which is not completely drawn and was also shown only schematically.
  • the shaft part 2 has a non-continuous longitudinal bore 6 with thread 7 in order to receive a threaded rod 8.
  • the threaded rod 8 see Fig. 3, has a conical tip 9 and on the opposite side a screw-10, which consists of a hexagon in the present example, but of course, other insertion means such as a slot or a Phillips be provided.
  • the threaded rod 8 is also made of a stainless material.
  • the shank part 2 has continuous transverse bores 11, 12, 13 and 14 as well as 22, 23 and 24 in order to receive retention elements 15 - 18, 25 - 27, see FIGS. 1, 2, 5 and 4.
  • the transverse bores 22-24 are here seen radially orthogonal to the other transverse bores, but all transverse bores can be arranged both radially and axially at an arbitrary angle to each other.
  • a retention element 15 consists of two parts 15A and 15B, which are separated by a groove 15C, which represents a predetermined breaking point.
  • the retention elements 15 - 18 and 25 - 27 have a different length and be executed symmetrically or asymmetrically with respect to the predetermined breaking point, depending on the type of shaft and depending on the location of the L-bore.
  • the retention elements are inserted into the transverse bores, then the shaft is inserted into the cavity 19 of the Fer ⁇ urs 5, whereupon the threaded rod 8 is screwed.
  • the tip 9 of the rod meets the predetermined breaking point of a
  • the length of the retention elements, or their individual parts and the diameter of the threaded rod are dimensioned such that after the screwing in of the threaded rod, the retention elements are driven into the bone. Of course not such that there is a risk that the bone can be blown up.
  • the spreading apart of the retention elements causes immediate stability of the joint shaft in the bone. In order to enable a better ingrowth of the bone, it is provided that the ends 20 of the retention elements are rounded.
  • a further measure to improve the growth of the bone can be achieved by attaching the bone tissue forming stimulating substances directly to the implant in order to achieve an improvement in the permanent anchoring of the retention elements.
  • the total length of the retention element is smaller than the length of the transverse bore receiving it, so that, see Fig. 1, on both sides the built-in retention elements, a cavity 21 is formed, which can be filled with the bone tissue formation stimulating substances.
  • any relevant substances such as hydroxyapatite or glass-ceramics or the like may be used as the bone tissue-forming stimulating substances.
  • substances based on ipriflavone are used, as are known from EP-B-638 321. Particularly good results were achieved with these substances.
  • stem for a hip joint prosthesis has been disclosed, but it will be readily apparent to one skilled in the art that another stem of another joint prosthesis will require different geometrical shapes and, in particular, the number of transverse holes noted here at seven. can vary. Likewise, the length and the ratio of the individual retention element parts to each other.

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)

Abstract

Der Schaft einer Gelenkprothese weist eine Längsbohrung (6) mit Innengewinde (7) und durchgehende, die Längsbohrung durchquerende Querbohrungen (11 - 14) auf, in denen beiderseits der Längsbohrung Retentionselemente (15 - 18) angeordnet sind, die durch einen in der Längsbohrung (6) geführten Gewindestab (8) spreizbar sind. Durch die Spreizelemente kann der Schaft zementlos implantiert werden und ist dennoch rascher belastbar als dies bei bekannten zementlos implantierbaren Schäfte der Fall ist.

Description

Schaft für Gelenkprothese
Die vorliegende Erfindung bezieht sich auf einen Schaft für eine Gelenkprothese gemäss Obergriff von Patentanspruch 1. Es gibt eine sehr grosse Anzahl von verschiedenen
Gelenkprothesen und auch von Schäften für Gelenkprothesen, beispielsweise Hüftgelenkprothesen, oder Schulter- oder Knieprothesen. Im Allgemeinen lassen sich die Prothesen grob in zwei Arten klassieren, solche, die ohne Knochenzement implantiert werden und solche, die mit Knochenzement implantiert werden.
Schäfte, die ohne Knochenzement implantiert werden, weisen entweder Tragrippen auf oder sind derart beschaffen, dass sie beim Hineinbringen in den Hohlraum sich durch ihre äussere Form bedingt verkeilen. Zementlos implantierbare Prothesen haben den Vorteil, dass nach dem Heranwachsen des Knochens die Prothese im Prinzip sehr lange halten kann, ohne Lockerungserscheinungen zu zeigen, während der Nachteil darin liegt, dass das Anwachsen des Knochens eine grosse
Zeit beansprucht, der Patient daher die Prothese lange nicht belasten kann. Prothesen, die sich auf Grund ihrer äusseren Geometrie verkeilen, haben den Nachteil, dass durch das Hineinbringen der Prothese der Knochen gesprengt werden kann .
Während die mit Knochenzement implantierten Implantate den Vorteil haben, relativ rasch belastbar zu sein, haben diese den Nachteil, dass in vielen Fällen der Zementköcher bricht und die Prothese dadurch gelockert wird, wodurch eine
Nachoperation notwendig wird.
Aus der EP-A-I 018 319 des gleichen Anmelders ist ein Kieferimplantat bekannt, das Retentionselemente aufweist, die in das Implantat einführbar und dort spreizbar sind. Wichtig bei diesem Kieferimplantat ist, dass das aus zwei Teilen bestehende Retentionselement durch eine Verriegelungsschraube gehalten ist, die von einem Gewindeschaft gesichert wird.
Es ist von diesem Stand der Technik ausgehend Aufgabe der vorliegenden Erfindung, einen Schaft für eine Gelenkprothese anzugeben, der zwar zementlos implantiert werden kann, jedoch schon von Beginn weg eine gute Haftung aufweist. Diese Aufgabe wird mit dem Schaft gemäss Patentanspruch 1 gelöst. Es ist eine weitere Aufgabe der Erfindung, Mittel vorzusehen, die das Anwachsen des Knochens beschleunigen. Diese weitere Aufgabe wird mit dem Schaft gemäss Anspruch 4 gelöst.
Die Erfindung wird im Folgenden anhand von Zeichnungen eines Ausführungsbeispiels näher erläutert. Dabei bezieht sich das Ausführungsbeispiel auf den Schaft einer Hüftgelenkprothese, doch könnte es ebensogut ein Schaft für eine andere Prothese wie Schultergelenkprothese oder andere sein.
Fig. 1 zeigt in einem Längsschnitt einen Schaft einer Hüftgelenkprothese während dem Implantieren,
Fig. 2 zeigt den Schaft von Fig. 1 im vollständig implantierten Zustand,
Fig. 3 ist eine Ausschnittsvergrösserung des
Gewindestabes von Fig. 1,
Fig. 4 ist eine Ausschnittsvergrösserung eines Retentionselementes, und
Fig. 5 ist ein Schnitt gemäss der Linie V-V in Fig. 2. Fig. 1 zeigt den Schaft 1 einer Hüftgelenkprothese, der einen Schaftteil 2 und einen dazu abgewinkelten Hals 3 aufweist, auf den eine Gelenkkugel 4 aufgesteckt ist. Die Materialien sind an sich bekannt und können bekannte Chrom- Kobalt-Stahl-Legierungen sein, während die Gelenkkugel entweder aus Polyäthylen oder Aluminiuiαoxyd-Keramik sein kann.
Der Schaft 1 steckt in einem Oberschenkelknochen, dem Femur 5, der nicht vollständig eingezeichnet ist und auch nur schematisch dargestellt wurde. Der Schaftteil 2 weist eine nicht durchgehende Längsbohrung 6 mit Gewinde 7 auf, um einen Gewindestab 8 aufzunehmen.
Der Gewindestab 8, siehe Fig. 3, weist eine konische Spitze 9 und auf der entgegengesetzten Seite ein Eindrehmittel 10 auf, das in vorliegendem Beispiel aus einem Sechskant besteht, doch können selbstverständlich auch andere Eindrehmittel wie ein Schlitz oder ein Kreuzschlitz vorgesehen sein. Der Gewindestab 8 ist ebenfalls aus einem rostfreien Material gefertigt.
Der Schaftteil 2 weist gemäss den Figuren 1, 2 oder 5 durchgehende Querbohrungen 11, 12, 13 und 14 sowie 22, 23 und 24 auf, um Retentionselemente 15 - 18, 25 - 27 aufzunehmen, siehe Figuren 1, 2, 5 und 4. Die Querbohrungen 22 - 24 sind hier radial gesehen orthogonal zu den anderen Querbohrungen eingezeichnet, doch können sämtliche Querbohrungen jeweils sowohl radial als auch axial in einen beliebigen Winkel zueinander angeordnet sein.
Wie aus Fig. 4 hervorgeht, besteht ein Retentionselement 15 aus zwei Teilen 15A und 15B, die durch eine Nut 15C getrennt sind, die eine Sollbruchstelle darstellt. Wie aus den Figuren 1, 2 und 5 hervorgeht, können die Retentionselemente 15 - 18 und 25 - 27 eine unterschiedliche Länge haben und bezüglich der Sollbruchstelle symmetrisch oder asymmetrisch ausgeführt sein, je nach Art des Schaftes und je nach Ort der L-ängsbohrung .
Vor dem Implantieren werden die Retentionselemente in die Querbohrungen gesteckt, dann wird der Schaft in den Hohlraum 19 des Ferαurs 5 eingebracht, woraufhin der Gewindestab 8 eingedreht wird. Beim Eindrehen des Gewindestabs trifft die Spitze 9 des Stabes auf die Sollbruchstelle eines
Retentionselementes und bewirkt beim weiteren Hineindrehen dort einen Bruch und damit das Spreizen der
Retentionselement-Teile in den Knochen. Dies geht aus Fig. 1 hervor, wo der Gewindestab am fünften Retentionselement von oben angreift, um dieses zu spalten und zu spreizen.
Die Länge der Retentionselemente, bzw. deren Einzelteile sowie der Durchmesser des Gewindestabes sind derart bemessen, dass nach dem Hineindrehen des Gewindestabes die Retentionselemente in den Knochens hineingetrieben werden. Selbstverständlich nicht derart, dass Gefahr besteht, dass der Knochen gesprengt werden kann. Das Auseinanderspreizen der Retentionselemente bewirkt eine sofortige Stabilität des Gelenkschaftes im Knochen. Um ein besseres Hineinwachsen des Knochens zu ermöglichen ist es vorgesehen, dass die Enden 20 der Retentionselemente abgerundet sind.
Eine weitere Massnahme zur Verbesserung des Anwachsens des Knochens kann dadurch erzielt werden, dass die Knochengewebebildung stimulierende Substanzen direkt am Implantat angebracht werden, um eine Verbesserung der dauerhaften Verankerung der Retentionselemente zu erzielen. Zu diesem Zwecke ist vorgesehen, dass die Gesamtlänge des Retentionselementes kleiner ist als die Länge der sie aufnehmenden Querbohrung, so dass, siehe Fig. 1, beiderseits der eingebauten Retentionselemente ein Hohlraum 21 entsteht, der mit die Knochengewebebildung stimulierenden Substanzen gefüllt werden kann.
Als die Knochengewebebildung stimulierende Substanzen können im Prinzip alle einschlägig wirksamen Substanzen wie Hydroxylapatit oder Glaskeramiken oder dergleichen verwendet werden. Vorzugsweise sind jedoch Substanzen auf Ipriflavonbasis einzusetzen, wie sie aus der EP-B-638 321 bekannt sind. Mit diesen Substanzen wurden besonders gute Resultate erzielt.
Wie eingangs ausgeführt, wurde ein Ausführungsbeispiel eines Schaftes für eine Hüftgelenkprothese offenbart, doch ist es für einen Fachmann ohne weiteres nachvollziehbar, dass für einen Schaft einer anderen Gelenkprothese andere geometrische Formen erforderlich sind und insbesondere die Anzahl der Querbohrungen, die hier mit sieben angegeben wurde, variieren kann. Desgleichen die Länge und das Verhältnis der einzelnen Retentionselement-Teile zueinander.

Claims

Patentansprüche
1. Schaft einer Gelenkprothese, dadurch gekennzeichnet, dass er eine Längsbohrung (6) mit Innengewinde (7) und durchgehende, die Längsbohrung durchquerende Querbohrungen (11 - 14, 22 - 24) aufweist, in denen Retentionselemente (15 - 18, 25 - 27) angeordnet sind, die durch einen in der Längsbohrung (6) geführten Gewindestab (8) spreizbar sind.
2. Schaft nach Anspruch 1, dadurch gekennzeichnet, dass das Retentionselement (15 - 18, 22 - 24) ein abgerundetes Ende (20) und eine Sollbruchstelle (15C) aufweist.
3. Schaft nach Anspruch 2, dadurch gekennzeichnet, dass die Retentionselemente für einen Schaft und die
Retentionselement-Teile beiderseits der Sollbruchstelle unterschiedliche Längen aufweisen.
4. Schaft nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Länge eines Retentionselementes kleiner ist als die dieses Teil aufnehmende Querbohrung, um einen Hohlraum (21) zur Aufnahme einer die Knochengewebebildung begünstigende Substanz zu schaffen.
5. Schaft nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Querbohrungen (11 - 14, 22 - 24) jeweils bezüglich der Längsmittelachse des Schaftes sowohl radial als auch axial beliebig zueinander ausgerichtet sind.
PCT/CH2007/000198 2006-04-28 2007-04-24 Schaft für gelenkprothese WO2007124607A1 (de)

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CH7072006 2006-04-28

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011055106B3 (de) * 2011-11-07 2013-04-11 Danijela Müller-Zivkovic Hüftprothese
WO2021103442A1 (zh) * 2019-11-28 2021-06-03 佛山市逸合生物科技有限公司 一种股骨柄
CN117257429A (zh) * 2023-11-21 2023-12-22 苏州爱得科技发展股份有限公司 椎弓根钉

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3024785A (en) * 1959-06-10 1962-03-13 Dobelle Martin Femoral head prosthesis
DE2305442A1 (de) * 1973-02-03 1974-08-08 Rosenthal Stemag Tech Keramik Implantat zur befestigung im inneren von roehrenknochen
WO1997048352A1 (en) * 1996-06-18 1997-12-24 Mehran Kasra Bone prosthesis fixation device and methods of using same
US5702481A (en) * 1995-05-16 1997-12-30 Lin; Chih-I Bone marrow cavity fixation device for treating a fractured bone
EP1018319A1 (de) * 1999-01-08 2000-07-12 Lászlo Dr. Prezmecky Kieferimplantat

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3024785A (en) * 1959-06-10 1962-03-13 Dobelle Martin Femoral head prosthesis
DE2305442A1 (de) * 1973-02-03 1974-08-08 Rosenthal Stemag Tech Keramik Implantat zur befestigung im inneren von roehrenknochen
US5702481A (en) * 1995-05-16 1997-12-30 Lin; Chih-I Bone marrow cavity fixation device for treating a fractured bone
WO1997048352A1 (en) * 1996-06-18 1997-12-24 Mehran Kasra Bone prosthesis fixation device and methods of using same
EP1018319A1 (de) * 1999-01-08 2000-07-12 Lászlo Dr. Prezmecky Kieferimplantat

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011055106B3 (de) * 2011-11-07 2013-04-11 Danijela Müller-Zivkovic Hüftprothese
WO2021103442A1 (zh) * 2019-11-28 2021-06-03 佛山市逸合生物科技有限公司 一种股骨柄
CN117257429A (zh) * 2023-11-21 2023-12-22 苏州爱得科技发展股份有限公司 椎弓根钉
CN117257429B (zh) * 2023-11-21 2024-01-30 苏州爱得科技发展股份有限公司 椎弓根钉

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