DE10111984C1 - Endogelenkprothese - Google Patents
EndogelenkprotheseInfo
- Publication number
- DE10111984C1 DE10111984C1 DE10111984A DE10111984A DE10111984C1 DE 10111984 C1 DE10111984 C1 DE 10111984C1 DE 10111984 A DE10111984 A DE 10111984A DE 10111984 A DE10111984 A DE 10111984A DE 10111984 C1 DE10111984 C1 DE 10111984C1
- Authority
- DE
- Germany
- Prior art keywords
- joint prosthesis
- prosthesis according
- support surface
- endo
- bone
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Fee Related
Links
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
- A61F2/3601—Femoral heads ; Femoral endoprostheses for replacing only the epiphyseal or metaphyseal parts of the femur, e.g. endoprosthetic femoral heads or necks directly fixed to the natural femur by internal fixation devices
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
-
- 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
-
- 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
-
- 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
- A61F2002/30113—Rounded shapes, e.g. with rounded corners circular
- A61F2002/30115—Rounded shapes, e.g. with rounded corners circular circular-O-shaped
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- 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
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30108—Shapes
- A61F2002/30199—Three-dimensional shapes
- A61F2002/30205—Three-dimensional shapes conical
- A61F2002/3021—Three-dimensional shapes conical frustoconical
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- A—HUMAN NECESSITIES
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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
- 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
- A61F2002/30199—Three-dimensional shapes
- A61F2002/30224—Three-dimensional shapes cylindrical
- A61F2002/30235—Three-dimensional shapes cylindrical tubular, e.g. sleeves
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- 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
- 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
- A61F2002/30327—The prosthesis having different structural features at different locations within the same prosthesis differing in diameter
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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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
- 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
- A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
- A61F2002/30332—Conically- or frustoconically-shaped protrusion and recess
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- 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
- 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
- A61F2002/30331—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
- A61F2002/30354—Cylindrically-shaped protrusion and recess, e.g. cylinder of circular basis
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- 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
- A61F2002/30433—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
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- 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
- 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
- A61F2002/30565—Special structural features of bone or joint prostheses not otherwise provided for having spring elements
- A61F2002/30566—Helical springs
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- 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
- A61F2/30767—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
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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
- A61F2/30767—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
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- A61F2002/30787—Plurality of holes inclined obliquely with respect to each other
-
- 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
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- A61F2002/30772—Apertures or holes, e.g. of circular cross section
- A61F2002/3079—Stepped or enlarged apertures, e.g. having discrete diameter changes
-
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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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- A61F2002/3082—Grooves
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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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- A61F2002/30841—Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
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- A61F2/02—Prostheses implantable into the body
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Abstract
Um bei einer Endogelenkprothese mit einem in einen Knochen einsetzbaren Verankerungsteil, mit einem eine Gelenkfläche aufweisenden Gelenkteil und mit einer auf den Knochen auflegbaren Stützfläche, die eine Anzahl von Vertiefungen aufweist, die Verankerung zwischen Endogelenkprothese und Knochenmaterial zu verbessern, wird vorgeschlagen, daß sich der Querschnitt der Vertiefungen von der Stützfläche in Richtung auf das Gelenkteil erweitert.In order to improve the anchoring between the endogenous prosthesis and the bone material in an endogenous joint prosthesis with an anchoring part that can be inserted into a bone, with a joint part that has an articular surface and with a supporting surface that can be placed on the bone and that has a number of depressions, it is proposed that the cross section be improved of the depressions extended from the support surface in the direction of the joint part.
Description
Die Erfindung betrifft eine Endogelenkprothese mit ei nem in einen Knochen einsetzbaren Verankerungsteil, mit einem eine Gelenkfläche aufweisenden Gelenkteil und mit einer auf den Knochen auflegbaren Stützfläche, die eine Anzahl von Vertiefungen aufweist.The invention relates to an endogenous joint prosthesis with an egg anchor part that can be inserted into a bone, with a joint part having a joint surface and with a support surface that can be placed on the bone, the one Has number of wells.
Eine solche Endogelenkprothese ist beispielsweise be schrieben im Firmenprospekt der Firma Aesculap AG & Co. KG "PM-PLASMAPORE", Prospekt Nr. S-094588/4, Auflage 1.Such an endogenous joint prosthesis is described, for example, in the company brochure of Aesculap AG & Co. KG "PM-PLASMAPORE", brochure no. S-094588/4, edition 1 .
Bei derartigen Endogelenkprothesen, bei denen bei spielsweise ein Verankerungsteil in Form eines Schaftes in den Markraum eines Röhrenknochens eingeschoben wird und bei dem sich die Endogelenkprothese mit der Stütz fläche auf einem oberen Rand des entsprechenden Kno chens abstützt, ist es außerordentlich wichtig, eine feste Verankerung zwischen der Endogelenkprothese ei nerseits und dem umgebenden Knochenmaterial anderer seits zu erreichen. Diese Verankerung muß nach Möglich keit gegen Zug- und Druckbelastungen in beliebigen Richtungen wirksam sein, da nur dadurch gewährleistet ist, daß bei beliebigen Belastungen eine dauerhafte Verbindung zwischen Endogelenkprothese und Knochen bei behalten wird.In such endo-articular prostheses, in which for example an anchoring part in the form of a shaft is inserted into the medullary cavity of a long bone and where the endogenous prosthesis with the support area on an upper edge of the corresponding kno chens, it is extremely important to have one firm anchoring between the endo joint prosthesis on the other hand and the surrounding bone material of others to reach on the part. This anchorage must if possible against tensile and compressive loads in any Directions must be effective as this is the only way to ensure is that a permanent at any load Connection between endo-prosthesis and bone will be kept.
Es ist Aufgabe der Erfindung, bei einer gattungsgemäßen Endogelenkprothese eine optimale Verbindung zwischen der Endogelenkprothese und dem umgebenden Knochenmate rial sicherzustellen.It is an object of the invention in a generic Endo joint prosthesis an optimal connection between the endogenous joint prosthesis and the surrounding bone mate rial ensure.
Diese Aufgabe wird bei einer Endogelenkprothese der eingangs beschriebenen Art erfindungsgemäß dadurch ge löst, daß sich der Querschnitt der Vertiefungen von der Stützfläche in Richtung auf das Gelenkteil erweitert. Die Vertiefungen weisen also einen Hinterschnitt auf, so daß sich durch in die Vertiefungen einwachsendes Knochenmaterial eine optimale Verankerung der Endoge lenkprothese mit dem darunterliegenden Knochenmaterial ergibt, durch die ein Ablösen der Endogelenkprothese vom Knochen auch dann sicher verhindert wird, wenn in Längsrichtung des Knochens wirkende Zugkräfte auftre ten.This task is performed with an endogenous joint prosthesis type described above ge according to the invention triggers that the cross section of the wells from the Support surface extended towards the joint part. The depressions therefore have an undercut, so that growing into the wells Bone material an optimal anchorage of the endogenous steering prosthesis with the underlying bone material results in detachment of the endogenous joint prosthesis is safely prevented from the bone even when in Apply tensile forces acting in the longitudinal direction of the bone th.
Vorteilhaft ist es, wenn der sich erweiternde Quer schnitt unmittelbar an die Stützfläche anschließt.It is advantageous if the widening cross cut directly adjoining the support surface.
Bei einer bevorzugten Ausführungsform kann vorgesehen sein, daß die Vertiefungen durch parallel zur Stützflä che verlaufende Kanäle gebildet werden, die von der Stützfläche in ihrem unteren, schmaler werdenden Be reich geschnitten werden, so daß nur der obere Teil dieser Kanäle im Material der Endogelenkprothese ver läuft, während die Kanäle nach unten hin offen sind.In a preferred embodiment can be provided be that the wells by parallel to the Stützflä che extending channels are formed by the Support surface in its lower, narrowing Be be richly cut so that only the upper part of these channels in the material of the endogenous prosthesis runs while the channels are open at the bottom.
Insbesondere können die Kanäle im Querschnitt kreisför mig sein. In particular, the channels can be circular in cross section be mig.
Es ist vorteilhaft, wenn die Kanäle vom äußeren Rand der Stützfläche in Richtung auf die Mitte der Stützflä che verlaufen.It is advantageous if the channels are from the outer edge the support surface towards the center of the support surface che run.
Eine besonders gleichmäßige Verankerung ergibt sich, wenn die Vertiefungen über den Umfang der Stützfläche gleichmäßig verteilt sind.A particularly even anchoring results if the depressions extend over the circumference of the support surface are evenly distributed.
Die Stützfläche hat vorzugsweise die Form eines Ringes, der je nach Form der Endoprothese kreisförmig oder auch oval ausgebildet sein kann, und umgibt das Veranke rungsteil allseitig.The support surface is preferably in the form of a ring, depending on the shape of the endoprosthesis circular or can be oval, and surrounds the anchoring on all sides.
Günstig ist es, wenn die Stützfläche und/oder die Ver tiefung eine mikroporöse Oberfläche aufweisen, so daß Knochenmaterial sich innig mit der Oberfläche der Ver tiefungen und mit der Stützfläche verbinden kann. Diese mikroporöse Oberfläche kann beispielsweise durch eine poröse Beschichtung mit Titan erzeugt werden.It is favorable if the supporting surface and / or the ver have a microporous surface so that Bone material is intimate with the surface of the ver can deepen and connect with the support surface. This microporous surface can, for example, by a porous coating can be created with titanium.
Günstig ist es, wenn die Stützfläche mindestens eine nach unten abstehenden Vorsprung aufweist, der in die Knochensubstanz eindringt und zu einer zusätzlichen Festlegung der Endoprothese auf dem Knochen führt.It is favorable if the support surface has at least one has protruding downward, which in the Bone enters and an additional Fixing the endoprosthesis on the bone leads.
Dieser Vorsprung kann beispielsweise durch eine ring förmige, zur Stützfläche gleichlaufende Stützrippe ge bildet werden, die vorzugsweise im Querschnitt V-förmig oder keilförmig ausgebildet ist. This projection can, for example, by a ring shaped, parallel to the support surface supporting rib ge are formed, which are preferably V-shaped in cross section or is wedge-shaped.
Bei einer besonders bevorzugten Ausführungsform ist vorgesehen, daß das Verankerungsteil die Form eines an die Stützfläche anschließenden Hohlzylinders hat, des sen Wand Verankerungsmittel trägt, die eine Verbindung mit der umgebenden Knochensubstanz ermöglichen.In a particularly preferred embodiment provided that the anchoring part in the form of a the support surface has adjacent hollow cylinder, the sen wall anchoring that carries a connection with the surrounding bone.
Dadurch wird die Verankerung der Endoprothese noch wei ter gefördert, diese Verankerungsmittel dienen insbe sondere als Verdrehsicherung, können aber auch zusätz lich die dauerhafte Verbindung des Knochens und der Endoprothese in Längsrichtung verbessern. Weiterhin können in der Wand des Hohlzylinders Durchbrechungen angeordnet sein, durch die Knochenmaterial hindurch wächst und somit eine knöcherne Brücke zwischen dem Knochenmaterial außerhalb des Hohlzylinders und dem in nerhalb des Hohlzylinders herstellt.As a result, the anchoring of the endoprosthesis is still white promoted, these anchoring means serve in particular special as anti-rotation, but can also be additional Lich the permanent connection of the bone and the Improve the endoprosthesis lengthways. Farther can have openings in the wall of the hollow cylinder be arranged through the bone material grows and thus a bony bridge between the Bone material outside the hollow cylinder and in manufactures within the hollow cylinder.
Auch ist es vorteilhaft, wenn der Hohlzylinder eine mi kroporöse Oberfläche aufweist, so daß dadurch die inni ge Verbindung mit dem Knochenmaterial gefördert wird.It is also advantageous if the hollow cylinder has an mi has a porous surface, so that the inni ge connection with the bone material is promoted.
Die Verankerungsmittel können dabei sehr unterschied lich ausgebildet sein, beispielsweise kann vorgesehen sein, daß die Verankerungsmittel achsparallele, über den Umfang des Hohlzylinders verteilte Längsrippen um fassen, die von der Außenwand radial nach außen abste hen.The anchoring means can be very different Lich formed, for example, can be provided be that the anchoring means axially parallel, about longitudinal ribs distributed around the circumference of the hollow cylinder grasp that radially outwards from the outer wall hen.
Es ist auch möglich, daß die Verankerungsmittel achs parallele, über den Umfang des Hohlzylinders verteilte Längsrippen umfassen, die von der Innenwand radial nach innen abstehen.It is also possible that the anchoring means ax parallel, distributed over the circumference of the hollow cylinder Include longitudinal ribs extending radially from the inner wall stand out inside.
Dabei ist es besonders vorteilhaft, wenn sich der In nenraum des Hohlzylinders bis in den oberhalb der Stützfläche angeordneten Gelenkteil erstreckt und wenn die nach innen abstehenden Längsrippen oberhalb der Stützfläche angeordnet sind.It is particularly advantageous if the In inner space of the hollow cylinder into the above the Support surface arranged joint part extends and if the inwardly projecting longitudinal ribs above the Support surface are arranged.
Bei einer weiteren bevorzugten Ausführungsform sind die Verankerungsmittel durch Gewindemittel gebildet, die ein Einschrauben des Hohlzylinders in die Knochensub stanz ermöglichen. Eine solche Verankerung hat den zu sätzlichen Vorteil, daß im Anlagebereich der Stützflä che am Knochen eine dauerhafte Spannung erzeugt wird, die die Endoprothese mit der Stützfläche gegen den Kno chen drückt, so daß in diesem Bereich eine besonders innige Verbindung hergestellt wird.In a further preferred embodiment, the Anchoring means formed by thread means that screwing the hollow cylinder into the bone sub enable punching. Such anchoring has to additional advantage that in the area of the support surface permanent tension is generated on the bone, which the endoprosthesis with the support surface against the kno Chen presses, so that a special in this area intimate connection is established.
Diese innige Verbindung kann auch dadurch erzeugt wer den, daß die Endoprothese einen sie durchsetzenden Zug anker aufnimmt, der im Knochen festlegbar ist und die Stützfläche gegen den Knochen spannt.This intimate connection can also be created by who that the endoprosthesis pulls through it takes anchor, which can be fixed in the bone and the Support surface against the bone.
Dieser Zuganker kann beispielsweise ein in den Knochen einschraubbares Außengewinde tragen.This tie rod can, for example, be in the bone wear screw-in external thread.
Besonders vorteilhaft ist es, wenn sich der Zuganker über elastische Federmittel an der Endoprothese ab stützt, so daß dadurch gewährleistet ist, daß die Endoprothese dauerhaft unter Spannung gegen den Knochen ge drückt wird.It is particularly advantageous if the tie rod via elastic spring means on the endoprosthesis supports, so that it is ensured that the endoprosthesis permanently under tension against the bone is pressed.
Die vorstehenden Ausgestaltungen sind auch jeweils für sich genommen vorteilhaft, nicht nur in Kombination miteinander. Dies gilt insbesondere auch für eine Aus gestaltung des Hohlzylinders mit Gewinde, für die Aus gestaltung des rippenförmigen Vorsprungs an der Stütz fläche und für die Verwendung eines Zugankers zum An drücken der Endoprothese gegen den Knochen. Der bean spruchte Schutz soll sich daher auch auf diese Merkmale in Alleinstellung oder in beliebiger Merkmalskombinati on erstrecken, gegebenenfalls auch ohne die Verwendung hinterschnittener Vertiefungen in der Stützfläche.The above configurations are also for taken advantageous, not only in combination together. This applies in particular to an off design of the hollow cylinder with thread, for the Aus design of the rib-shaped projection on the support surface and for the use of a tie rod to the press the endoprosthesis against the bone. The bean Protection should therefore also apply to these characteristics alone or in any combination of features extend on, possibly without using undercut indentations in the support surface.
Die nachfolgende Beschreibung bevorzugter Ausführungs formen der Erfindung dient im Zusammenhang mit der Zeichnung der näheren Erläuterung. Es zeigen:The following description of preferred embodiment forms of the invention is used in connection with the Drawing of the detailed explanation. Show it:
Fig. 1: eine Teilschnittansicht einer Hüftgelenk prothese im eingebauten Zustand; Fig. 1: a partial sectional view of a hip joint prosthesis in the installed state;
Fig. 2: eine Teilschnittansicht des Femurprothesen teils der Hüftgelenkprothese der Fig. 1 vor der Implantation; FIG. 2 is a partial sectional view of the femoral prostheses portion of the prosthetic hip joint of Figure 1 prior to implantation;.
Fig. 3: eine Schnittansicht längs Linie 3-3 in Fig. 2; Fig. 3 is a sectional view taken along line 3-3 in FIG. 2;
Fig. 4: eine Schnittansicht längs Linie 4-4 in Fig. 2; Fig. 4 is a sectional view taken along line 4-4 in Fig. 2;
Fig. 5: eine vergrößerte Ansicht des Bereiches A in Fig. 1; FIG. 5: an enlarged view of area A in FIG. 1;
Fig. 6: eine Teillängsschnittansicht eines anderen bevorzugten Ausführungsbeispiels einer Hüftgelenkprothese mit einem Hohlzylinder mit Außengewinde; FIG. 6 is a partial longitudinal sectional view of another preferred embodiment of a hip joint prosthesis comprising a hollow cylinder with external thread;
Fig. 7: eine Detailansicht in Richtung des Pfeiles B in Fig. 6 und Fig. 7: a detailed view in the direction of arrow B in Fig. 6 and
Fig. 8: eine Ansicht ähnlich Fig. 6 bei einem an deren bevorzugten Ausführungsbeispiel einer Hüftgelenkprothese mit einem einschraubba ren Zuganker. Fig. 8 is a view similar to Figure 6, in a preferred embodiment of the prosthesis of a hip joint with a tie rod einschraubba ren..
Die in den Fig. 1 bis 5 dargestellte Hüftgelenkpro these 1 umfaßt eine in den Hüftknochen 2 implantierte Lagerschale 3 und eine in den Femurknochen 4 implan tierte Gelenkprothese 5. Diese Gelenkprothese 5 ihrer seits ist zweiteilig aufgebaut, sie besteht nämlich aus einem Träger 6 und einer mit diesem verbundenen Gelenk kugel 7, die in die Lagerschale 3 eingreift.The Hüftgelenkpro shown in FIGS. 1 to 5 includes 1 synthesis, an implanted into the hip bone 2 bearing shell 3 and one in the femur 4 IMPLAN oriented joint prosthesis. 5 This joint prosthesis 5 of its part is constructed in two parts, namely it consists of a support 6 and a joint ball 7 connected to it , which engages in the bearing shell 3 .
Der Träger 6 umfaßt ein sich konisch nach unten in Richtung auf den Femurknochen 4 erweiterndes Mittelteil 8, welches an seiner Oberseite in einen kegelstumpfför migen Steckzapfen 9 übergeht, auf den die Gelenkkugel 7 aufgesteckt ist, und welches auf der gegenüberliegenden Seite ein koaxial zum Steckzapfen 9 angeordnetes Verankerungselement in Form eines Hohlzylinders 10 trägt, dessen Außendurchmesser kleiner ist als der Außendurch messer des kegelstumpfförmigen Mittelteiles 8 an dessen Unterseite. Dadurch wird am Übergang zwischen dem Mit telteil 8 und dem Hohlzylinder 10 eine den Hohlzylinder 10 ringförmig umgebende Stützfläche 11 an der Untersei te des Mittelteiles 8 ausgebildet, diese Stützfläche 11 ist eben und verläuft senkrecht zur Längsachse des Hohlzylinders 10.The carrier 6 comprises a conically downwardly widening towards the femur bone 4 central part 8 , which merges on its upper side into a truncated cone 9 , onto which the joint ball 7 is plugged, and which on the opposite side coaxially to the plug 9 Arranged anchoring element in the form of a hollow cylinder 10 carries, whose outer diameter is smaller than the outer diameter of the frustoconical central part 8 on the underside. As a result, at the transition between With telteil 8 and the hollow cylinder 10 a the hollow cylinder 10 annularly surrounding support surface 11 on the Untersei te formed of the central part 8, this support surface 11 is planar and perpendicular to the longitudinal axis of the hollow cylinder 10 degrees.
In die Stützfläche 11 sind in radialer Richtung von der Außenseite zur Mitte hin verlaufende Kanäle 12 mit kreisförmigem Querschnitt eingearbeitet, die gleichmä ßig über den gesamten Umfang der Stützfläche 11 ver teilt sind und deren Querschnitt im unteren Teil durch die ebene Stützfläche 11 geschnitten wird, so daß die Kanäle 12 nach unten hin offen sind (Fig. 5). Damit erweitert sich der Querschnitt der Kanäle 12 von der unteren, schlitzförmigen Öffnung 13 nach oben hin, der Querschnitt des Kanals 12 weist also einen Hinter schnitt auf.In the support surface 11 in the radial direction from the outside towards the center channels 12 are incorporated with a circular cross-section, which are evenly distributed over the entire circumference of the support surface 11 and whose cross section is cut in the lower part by the flat support surface 11 , so that the channels 12 are open towards the bottom ( Fig. 5). Thus, the cross section of the channels 12 extends from the lower, slot-shaped opening 13 upwards, so the cross section of the channel 12 has an undercut.
Der Hohlzylinder 10 erstreckt sich über eine Länge, die etwa der Länge des Mittelteils 8 und des Steckzapfens 9 entspricht, in der Wand des Hohlzylinders 10 sind über die gesamte Wand verteilt Durchbrechungen 14 angeord net.The hollow cylinder 10 extends over a length which corresponds approximately to the length of the central part 8 and the plug pin 9 , in the wall of the hollow cylinder 10 openings 14 are net angeord distributed over the entire wall.
Außerdem trägt der Hohlzylinder 10 auf seiner Außensei te gleichmäßig über den Umfang verteilt eine größere Anzahl von achsparallel verlaufenden, radial nach außen abstehenden Längsrippen 15.In addition, the hollow cylinder 10 carries on its outer surface te evenly distributed over the circumference a larger number of axially parallel, radially projecting longitudinal ribs 15th
Der Innenraum des Hohlzylinders 10 setzt sich im Inne ren des Mittelteiles 8 auch noch oberhalb der Stützflä che 11 fort, und in diesem Bereich des Mittelteiles 8 sind an der Innenwand des Innenraums eine Vielzahl von gleichmäßig über den Umfang verteilten, achsparallel verlaufenden, radial in den Innenraum vorstehenden Längsrippen 16 angeordnet, die sich in Längsrichtung nur bis zur Stützfläche 11 erstrecken.The interior of the hollow cylinder 10 continues in the interior of the central part 8 also above the Stützflä surface 11 , and in this area of the central part 8 are on the inner wall of the interior a variety of evenly distributed over the circumference, axially parallel, radially in the Interior longitudinal ribs 16 are arranged, which extend in the longitudinal direction only to the support surface 11 .
Zur Implantation wird in den Femurknochen 4 mit einem hohlzylindrischen Fräsinstrument ein Ringspalt einge fräst, dessen Kontur der des Hohlzylinders 10 ent spricht, so daß die Gelenkprothese 5 mit dem Hohlzylin der 10 in diesen Ringspalt hineinragt. Die Eintauchtie fe wird dabei dadurch begrenzt, daß sich die Stützflä che 11 auf den oberen Rand 17 des Femurknochens 4 auf setzt, dieser Rand wird dazu entsprechend bearbeitet, so daß sich die Stützfläche 11 flächig an diesen oberen Rand 17 anlegen kann.For implantation, an annular gap is milled into the femoral bone 4 with a hollow cylindrical milling instrument, the contour of which corresponds to that of the hollow cylinder 10 , so that the prosthetic joint 5 with the hollow cylinder 10 projects into this annular gap. The Eintauchtie fe is limited by the fact that the Stützflä surface 11 on the upper edge 17 of the femur 4 is on, this edge is processed accordingly, so that the support surface 11 can lay flat on this upper edge 17 .
Nach der Implantation wird die Gelenkprothese 5 durch das einsetzende Knochenwachstum fest mit dem Femurkno chen verbunden. Das Knochenmaterial kann dabei von un ten her in die Kanäle 12 einwachsen, durchsetzt die Durchbrechungen 14 und wächst zwischen die Längsrippen 15 und 16 ein, so daß dadurch ein dauerhafter Form schluß entsteht, der die Gelenkprothese 5 am Femurkno chen 4 dauerhaft verankert. Diese Verankerung kann noch dadurch verbessert werden, daß die mit dem Knochen in Verbindung tretenden Kontaktflächen eine mikroporöse Oberflächenstruktur erhalten, beispielsweise durch eine im Plasma aufgetragene Titanoberfläche.After implantation, the joint prosthesis 5 is firmly connected to the femur bone by the onset of bone growth. The bone material can ingrow from un th in the channels 12 , penetrates the openings 14 and grows between the longitudinal ribs 15 and 16 , so that thereby a permanent form circuit arises, the articular prosthesis 5 on the femur bone 4 permanently anchored. This anchoring can be further improved in that the contact surfaces which come into contact with the bone are given a microporous surface structure, for example by a titanium surface applied in the plasma.
Die in Fig. 6 dargestellte Ausführungsform einer Hüft gelenkprothese 1 ist ähnlich aufgebaut wie die vorste hend beschriebene Ausführungsform, einander entspre chende Teile tragen daher dieselben Bezugszeichen.The embodiment of a hip joint prosthesis 1 shown in FIG. 6 is constructed similarly to the embodiment described above, corresponding parts therefore have the same reference numerals.
Bei dieser Ausführungsform fehlen am Hohlzylinder 10 äußere Längsrippen 15 und innere Längsrippen 16, statt dessen trägt der Hohlzylinder 10 bei dieser Ausfüh rungsform ein Außengewinde 18, das im dargestellten Ausführungsbeispiel durch einen durchgehenden Gewinde gang gebildet wird, das aber auch durch voneinander ge trennte Abschnitte eines Gewindes gebildet werden könn te. Dadurch ist der Hohlzylinder 10 bei dieser Ausge staltung in den Femurknochen 4 einschraubbar, so daß die Stützfläche 11 gegen den Femurknochen 4 gespannt werden kann.In this embodiment, there are no outer longitudinal ribs 15 and inner longitudinal ribs 16 on the hollow cylinder 10 , instead the hollow cylinder 10 in this embodiment carries an external thread 18 , which in the exemplary embodiment shown is formed by a continuous thread, but which is also separated by sections of a ge Thread could be formed. As a result, the hollow cylinder 10 can be screwed into this configuration in the femoral bone 4 , so that the support surface 11 can be clamped against the femoral bone 4 .
Im Anlagebereich der Stützfläche 11 trägt diese bei der dargestellten Ausführungsform eine mit der Stützfläche 11 umlaufende, von dieser nach unten abstehende Stütz rippe 19 mit einem V-förmigen oder keilförmigen Quer schnitt, die sich beim Andrücken der Stützfläche 11 an den Femurknochen 4 in die Knochensubstanz eingräbt und dadurch zu einer zusätzlichen Festlegung führt. In the contact area of the support surface 11 , this carries in the illustrated embodiment a circumferential rib 19 with the support surface 11 projecting downward therefrom with a V-shaped or wedge-shaped cross section, which is pressed into the bone substance when the support surface 11 is pressed onto the femur bone 4 digs in and leads to an additional definition.
Bei dem Ausführungsbeispiel der Fig. 8 ist wieder eine ähnliche Ausgestaltung gewählt wie bei dem Ausführungs beispiel der Fig. 1 bis 5, einander entsprechende Teile tragen auch hier dieselben Bezugszeichen.In the exemplary embodiment in FIG. 8, a configuration similar to that in the exemplary embodiment in FIGS. 1 to 5 is selected, corresponding parts also have the same reference numerals here.
Bei dieser Ausgestaltung ist ein Hohlzylinder 10 darge stellt, der weder ein Außengewinde noch Längsrippen trägt, es könnte aber durchaus eine Ausgestaltung ge wählt werden, wie sie in den Fig. 1 bis 5 darge stellt ist.In this embodiment, a hollow cylinder 10 is Darge, which carries neither an external thread nor longitudinal ribs, but it could be a configuration ge, as it is shown in FIGS . 1 to 5 Darge.
Auch bei dieser Ausgestaltung kann eine mit der Stütz fläche 11 umlaufende Stützrippe 19 vorgesehen sein.In this embodiment too, a support rib 19 encircling the support surface 11 can be provided.
In einer Stufenbohrung 20 das Steckzapfens 9 ist bei dieser Ausführungsform ein Zuganker 21 in Form einer Knochenschraube aufgenommen, die an ihrem unteren Ende ein in den Femurknochen 4 einschraubbares Knochengewin de 22 und am gegenüberliegenden Ende einen Kopf 23 mit vergrößertem Außendurchmesser aufweist. Beim Einschrau ben des Zugankers 21 in die Substanz des Femurknochens 4 stützt sich dieser Kopf 23 entweder direkt oder - wie in Fig. 8 dargestellt - über eine den Zuganker 21 um gebende Schraubenfeder 24 an einer Stufe 25 der Stufen bohrung 20 ab, so daß dadurch die Hüftgelenkprothese 1 mit ihrer Stützfläche 11 kräftig gegen den Femurknochen 4 gedrückt wird. Die Schraubenfeder 24 kann gegebenen falls auch durch andere Federmittel ersetzt werden, beispielsweise durch Federringe.In a stepped bore 20 of the plug pin 9 , a tie rod 21 in the form of a bone screw is received in this embodiment, which has a screw thread into the femur bone 4 screw thread de 22 and at the opposite end a head 23 with an enlarged outer diameter. When screwing the tie rod 21 into the substance of the femur 4 , this head 23 is supported either directly or - as shown in Fig. 8 - via a tie rod 21 to give coil spring 24 on a step 25 of the step bore 20 , so that thereby the hip joint prosthesis 1 with its support surface 11 is pressed firmly against the femur bone 4 . The coil spring 24 can, if necessary, also be replaced by other spring means, for example by spring washers.
Claims (21)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE10111984A DE10111984C1 (en) | 2001-03-13 | 2001-03-13 | Endogelenkprothese |
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Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10111984A DE10111984C1 (en) | 2001-03-13 | 2001-03-13 | Endogelenkprothese |
DE20104312U DE20104312U1 (en) | 2001-03-13 | 2001-03-13 | Endo joint prosthesis |
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Publication Number | Publication Date |
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DE10111984C1 true DE10111984C1 (en) | 2002-08-01 |
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DE10111984A Expired - Fee Related DE10111984C1 (en) | 2001-03-13 | 2001-03-13 | Endogelenkprothese |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2335653A1 (en) * | 2009-12-16 | 2011-06-22 | Slobodan Tepic | Partial hip prosthesis |
EP2484315A1 (en) * | 2011-02-07 | 2012-08-08 | Arthrex, Inc. | Minimally invasive total hip replacement |
-
2001
- 2001-03-13 DE DE10111984A patent/DE10111984C1/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
"PM-PLASMAPORE" Firmenprospekt der Fa. Aesculap AG & Co KG, Prospekt Nr. S-094588/4, Aufl. 1 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2335653A1 (en) * | 2009-12-16 | 2011-06-22 | Slobodan Tepic | Partial hip prosthesis |
US11202711B2 (en) | 2009-12-16 | 2021-12-21 | Scyon Orthopaedics Ag | Partial hip prosthesis |
EP2484315A1 (en) * | 2011-02-07 | 2012-08-08 | Arthrex, Inc. | Minimally invasive total hip replacement |
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