DE4405447B4 - hip prosthesis - Google Patents

hip prosthesis Download PDF

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Publication number
DE4405447B4
DE4405447B4 DE4405447A DE4405447A DE4405447B4 DE 4405447 B4 DE4405447 B4 DE 4405447B4 DE 4405447 A DE4405447 A DE 4405447A DE 4405447 A DE4405447 A DE 4405447A DE 4405447 B4 DE4405447 B4 DE 4405447B4
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Germany
Prior art keywords
pin
contact surface
ball head
ball
neck lengths
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Expired - Fee Related
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DE4405447A
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German (de)
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DE4405447A1 (en
Inventor
Herbert Dr. Richter
Martin Wimmer
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Cerasiv GmbH Innovatives Keramik Engineering
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Cerasiv GmbH Innovatives Keramik Engineering
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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
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—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
    • A61F2002/30321—The prosthesis having different structural features at different locations within the same prosthesis differing in roughness
    • 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
    • A61F2002/30331—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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30593—Special structural features of bone or joint prostheses not otherwise provided for hollow
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30604—Special structural features of bone or joint prostheses not otherwise provided for modular
    • 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
    • A61F2002/30904—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves serrated profile, i.e. saw-toothed
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/365—Connections of heads to necks
    • 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
    • A61F2220/0033—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
    • 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
    • A61F2250/0025—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 roughness
    • 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
    • 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

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

Hüftgelenkprothese mit einem in den Femur einsetzbaren metallischen Schaft und mit einem mit diesem einstückig verbundenen Zapfen (1), auf dem ein keramischer Kugelkopf (2) mit einer Ausnehmung aufgesteckt ist und mit einer umlaufenden konischen Kontaktfläche (3) zwischen Zapfen (1) und Kugelkopf (2), dadurch gekennzeichnet, daß die Kontaktfläche (3) durch eine spezielle Oberflächenstruktur (7) des Zapfens (1) gebildet ist, derart, daß der Zapfen (1) an seinem zum Kugelkopf (2) gewandten Ende eine Tiefe der Struktur von größer als 100 μm aufweist, die kontinuierlichen Richtung bis zum Ende der Kontaktfläche (3) auf einen Wert nahe oder gleich Null abnimmt, um anschließend wieder kontinuierlich auf einen Wert größer als 100 μm am Ende der Kontaktfläche anzusteigen.hip prosthesis with a usable in the femur metallic shaft and with one with this one piece connected pin (1) on which a ceramic ball head (2) with a recess is plugged and with a circumferential conical contact area (3) between pin (1) and ball head (2), characterized that the contact area (3) by a special surface structure (7) of the pin (1) is formed, such that the pin (1) at its to the ball head (2) end facing a depth of the structure of greater than 100 μm, the continuous direction to the end of the contact surface (3) decreases to a value close to or equal to zero, and then again continuously to a value greater than 100 μm on End of the contact area to increase.

Figure 00000001
Figure 00000001

Description

Die Erfindung betrifft eine Hüftgelenkprothese nach dem Oberbegriff des Anspruchs 1.The The invention relates to a hip joint prosthesis according to the preamble of claim 1.

Aus der DE-C2-24 51 275 oder DE-T2-690 00 445 ist eine gattungsgemäße Hüftgelenkprothese mit einem in den Femur einsetzbaren metallischen Schaft und einem mit diesem einstückig verbundenen Zapfen bekannt. Eine keramische Hüftgelenkkugel bzw. ein keramischer Kugelkopf wird auf das konisch geformte Ende des Zapfens aufgesteckt. Die keramische Hüftgelenkkugel weist hierzu eine Ausnehmung mit einer konischen Bohrung auf. Durch diese Ausgestaltung ist eine umlaufende konische Kontaktfläche zwischen Zapfen und Hüftgelenkkugel bzw. Kugelkopf geschaffen.Out DE-C2-24 51 275 or DE-T2-690 00 445 is a generic hip joint prosthesis with a usable in the femur metallic stem and a with this one piece connected pin known. A ceramic hip ball or a ceramic Ball head is attached to the conical shaped end of the pin. The ceramic hip joint ball has for this purpose a recess with a conical bore. Through this Design is a circumferential conical contact surface between Pin and hip ball or Ball head created.

Keramische Kugelköpfe müssen strengen, z.B. von der FDA (Food and Drug Administration), gestellten Anforderungen bezüglich ihrer mechanischen Belastbarkeit genügen.ceramic ball heads have to strict, e.g. by the FDA (Food and Drug Administration) Requirements regarding satisfy their mechanical strength.

Um diesen strengen Anforderungen zu entsprechen, ist es bekannt, den Konuswinkel des metallischen Zapfens zwischen 5° 37' 30'' und 5° 42' 30'' und den Winkel der konischen Bohrung im keramischen Kugelkopf zwischen 5° 43' und 5° 45' zu legen.Around To meet these stringent requirements, it is known that Cone angle of the metallic pin between 5 ° 37 '30' 'and 5 ° 42' 30 '' and the angle of the conical bore in the ceramic ball head between 5 ° 43 'and 5 ° 45'.

Weltweit haben sich keramische Kugelköpfe mit einem Durchmesser von 28 mm durchgesetzt. Es gibt hierbei drei verschiedene Halslängen, nämlich kurz, mittel oder lang. Die Halslängen sind definiert als der axiale Abstand zwischen der Stirnfläche des konischen Endes des Schaftes und dem Pol der Hüftgelenkkugel bei aufgesteckter Hüftgelenkkugel. Beim Typ "kurze Halslänge" ist demnach dieser Abstand am kleinsten und beim Typ "lange Halslänge" am größten. Die Länge der Kontaktfläche, d.h. die axiale Länge der Fläche des Zapfens, die den Kugelkopf berührt, liegt

  • – bei kurzen Halslängen bei 14,9 mm
  • – bei mittellangen Halslängen bei 12,4 mm
  • – bei langen Halslängen bei 9,8 mm
Ceramic ball heads with a diameter of 28 mm have prevailed worldwide. There are three different neck lengths, short, medium or long. The neck lengths are defined as the axial distance between the end face of the conical end of the shaft and the pole of the hip joint ball with attached hip joint ball. Accordingly, the short neck length type is the smallest and the long neck length is the largest. The length of the contact surface, ie the axial length of the surface of the pin which contacts the ball head, is located
  • - with short neck lengths at 14.9 mm
  • - For medium-length neck lengths at 12.4 mm
  • - at long neck lengths at 9.8 mm

Der Erfindung liegt die Aufgabe zugrunde, eine Hüftgelenkprothese nach dem Oberbegriff des Anspruchs 1 derart weiterzubilden, daß ein optimaler Kraftschluß zwischen Kugelkopf und Zapfen erreicht ist.Of the Invention is based on the object, a hip joint prosthesis according to the preamble of claim 1 such that an optimal adhesion between Ball head and pin is reached.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß die Kontaktfläche durch eine spezielle Oberflächenstruktur des Zapfens gebildet ist, derart, daß der Zapfen an seinem zum Kugelkopf gewandten Ende eine Tiefe der Struktur von größer als 100 μm aufweist, die kontinuierlichen Richtung bis zum Ende der Kontaktfläche auf einen Wert nahe oder gleich Null abnimmt um anschließend wieder kontinuierlich auf einen Wert größer als 100 μm am Ende der Kontaktfläche anzusteigen. Mit dieser Maßnahme ist einerseits die Kontaktfläche definiert und andererseits ein Spalt zwischen Zapfen und Kugelkopf unterhalb der Kontaktfläche vermieden.According to the invention this Task solved by that the contact area through a special surface structure is formed of the pin, such that the pin at its to Ball-headed end has a depth of structure greater than 100 microns, the continuous direction up to the end of the contact surface decreases a value near or equal to zero and then again continuously to a value greater than 100 μm at the end the contact surface to increase. With this measure on the one hand is the contact surface defined and on the other hand, a gap between the pin and ball head below the contact surface avoided.

In bevorzugter Ausführungsform weist die Oberflächenstruktur ein sägezahn- oder sinusförmiges Profil auf.In preferred embodiment has the surface structure a sawtooth or sinusoidal Profile on.

Bei einem Kugelkopf mit einem Durchmesser von 28 mm liegt vorteilhafterweise die Länge der Kontaktfläche

  • – bei kurzen Halslängen zwischen 9 bis 12 mm,
  • – bei mittellangen Halslängen zwischen 6 bis 8 mm und
  • – bei langen Halslängen zwischen 5 bis 8 mm.
In a ball head with a diameter of 28 mm is advantageously the length of the contact surface
  • - for short neck lengths between 9 to 12 mm,
  • - For medium-length neck lengths between 6 to 8 mm and
  • - for long neck lengths between 5 to 8 mm.

Mit diesen verkürzten Kontaktflächen konnten die Berstkräfte, d.h. die Kraft, bei denen der Kugelkopf zerbricht, wesentlich gesteigert werden.With this shortened contact surfaces could the bursting forces, i.e. the force at which the ball head breaks, significantly increased become.

Weitere Ausgestaltungen der Erfindung ergeben sich aus der Figur, die nachfolgend beschrieben wird.Further Embodiments of the invention will become apparent from the figure below is described.

Die Figur zeigt einen erfindungsgemäßen Kugelkopf 2 einer Hüftgelenkprothese mit einer konischen Bohrung 4. Im Anschluß an die Bohrung 4 ist eine Ausnehmung 8 angeordnet, welche die Gewölbeoberseite bildet. Am Rand geht die Ausnehmung 8 über eine abgerundete Fläche 9 in die konische Bohrung 4 über.The figure shows a ball head according to the invention 2 a hip joint prosthesis with a conical bore 4 , Following the hole 4 is a recess 8th arranged, which forms the vault top. At the edge the recess goes 8th over a rounded surface 9 into the conical bore 4 above.

Die konische Bohrung 4 bildet in ihrem der Ausnehmung 8 zugewandten Bereich eine Anlagefläche für eine Kontaktfläche eines Zapfens 1 eines metallischen Schaftes, der in den Femur implantiert wird.The conical bore 4 forms in her the recess 8th facing area a contact surface for a contact surface of a pin 1 a metallic stem implanted in the femur.

Die Kontaktfläche 3 ist erfindungsgemäß durch eine spezielle Oberflächenstruktur 7 des Zapfens 1 gebildet. Der Zapfen 1, von dem in der Figur aus zeichentechnischen Gründen nur die linke Hälfte gezeigt ist, weist hierzu an seinem zum Kugelkopf 2, bzw. zur Ausnehmung 8, gewandten Ende eine Tiefe der Oberflächenstruktur 7 von größer als 100 μm auf, die kontinuierlich bis zum Ende der Kontaktfläche 3 auf einen Wert nahe oder gleich Null, dem Ende 3' der Kontaktfläche 3, abnimmt, um anschließend wieder kontinuierlich auf einen Wert größer als 100 μm anzusteigen. Der Zapfen 1 ist hierzu zumindest an seinem zum Kugelkopf 2 gewandten Ende zylindrisch ausgebildet.The contact surface 3 is according to the invention by a special surface structure 7 of the pin 1 educated. The pin 1 , of which in the figure, for technical reasons, only the left half is shown, this points to his to the ball head 2 , or to the recess 8th , the end facing a depth of surface texture 7 greater than 100 μm, which is continuous until the end of the contact surface 3 to a value near or equal to zero, the end 3 ' the contact surface 3 , decreases, and then continuously increase again to a value greater than 100 microns. The pin 1 this is at least on his ball head 2 turned end cylindrical.

Beim Aufsetzen des Kugelkopfes 2 auf den Zapfen 1 verformt sich die Oberfläche bzw. Oberflächenstruktur 7 des Zapfens 1 an der sich im Inneren des Kugelkopfes 2 befindlichen Stelle mit der tiefsten Rauhigkeit am stärksten und bildet dadurch einen optimalen Kraftschluß mit dem Kugelkopf 2. Diese Ausführungsform hat den großen Vorteil, daß unterhalb der Kontaktfläche 3 kein Spalt zwischen Zapfen 1 und Kugelkopf 2 vorhanden ist.When placing the ball head 2 on the cones 1 deforms the surface or Oberflä chenstruktur 7 of the pin 1 at the inside of the ball head 2 located spot with the deepest roughness most and thus forms an optimal adhesion to the ball head 2 , This embodiment has the great advantage that below the contact surface 3 no gap between pins 1 and ball head 2 is available.

Vorteilhafterweise weist die Oberflächenstruktur 7 einen sägezahn- oder sinusförmiges Profil auf. Es können aber auch andere Profile zweckmäßig sein.Advantageously, the surface structure 7 a sawtooth or sinusoidal profile. But it can also be useful other profiles.

Wird der Kugelkopf 2 auf den Zapfen aufgesetzt, so bildet nur die Kontaktfläche 3 die Verbindung zwischen Zapfen und Kugelkopf 2. Überraschenderweise liegen die Berstkräfte, die zur Zerstörung des Kugelkopfes 2 führen, bei gegenüber der maximal möglichen Länge der Kontaktfläche verringerten Kontaktfläche 3, wesentlich höher. Dies bedeutet, daß ein Kugelkopf 2 mit verringerter Kontaktfläche höhere Berstkräfte aushält, als ein Kugelkopf 2 mit der maximal möglichen Kontaktlänge.Will the ball head 2 put on the pin, so only forms the contact surface 3 the connection between pin and ball head 2 , Surprisingly, the bursting forces are responsible for the destruction of the ball head 2 lead, with respect to the maximum possible length of the contact surface reduced contact surface 3 , significantly higher. This means that a ball head 2 With reduced contact surface can withstand higher bursting forces than a ball head 2 with the maximum possible contact length.

Bei einem Durchmesser der Kugelköpfe 2 von 28 mm betragen die axialen Längen der Kontaktflächen 3 erfindungsgemäß

  • - bei kurzen Halslängen zwischen 9 bis 12 mm,
  • – bei mittellangen Halslängen zwischen 6 bis 8 mm und
  • – bei langen Halslängen zwischen 5 bis 8 mm.
At a diameter of the ball heads 2 of 28 mm are the axial lengths of the contact surfaces 3 inventively
  • - for short neck lengths between 9 to 12 mm,
  • - For medium-length neck lengths between 6 to 8 mm and
  • - for long neck lengths between 5 to 8 mm.

Claims (3)

Hüftgelenkprothese mit einem in den Femur einsetzbaren metallischen Schaft und mit einem mit diesem einstückig verbundenen Zapfen (1), auf dem ein keramischer Kugelkopf (2) mit einer Ausnehmung aufgesteckt ist und mit einer umlaufenden konischen Kontaktfläche (3) zwischen Zapfen (1) und Kugelkopf (2), dadurch gekennzeichnet, daß die Kontaktfläche (3) durch eine spezielle Oberflächenstruktur (7) des Zapfens (1) gebildet ist, derart, daß der Zapfen (1) an seinem zum Kugelkopf (2) gewandten Ende eine Tiefe der Struktur von größer als 100 μm aufweist, die kontinuierlichen Richtung bis zum Ende der Kontaktfläche (3) auf einen Wert nahe oder gleich Null abnimmt, um anschließend wieder kontinuierlich auf einen Wert größer als 100 μm am Ende der Kontaktfläche anzusteigen.Hip joint prosthesis with a metallic shaft which can be inserted into the femur and with a pin connected in one piece with the latter (US Pat. 1 ) on which a ceramic ball head ( 2 ) is fitted with a recess and with a circumferential conical contact surface ( 3 ) between pins ( 1 ) and ball head ( 2 ), characterized in that the contact surface ( 3 ) by a special surface structure ( 7 ) of the pin ( 1 ) is formed, such that the pin ( 1 ) at its to the ball head ( 2 ) has a depth of the structure of greater than 100 microns, the continuous direction to the end of the contact surface ( 3 ) decreases to a value close to or equal to zero, in order subsequently to increase again continuously to a value greater than 100 μm at the end of the contact surface. Hüftgelenkprothese nach Anspruch 1, dadurch gekennzeichnet, daß die Oberflächenstruktur (7) ein sägezahn- oder sinusförmiges Profil aufweist.Hip joint prosthesis according to claim 1, characterized in that the surface structure ( 7 ) has a sawtooth or sinusoidal profile. Hüftgelenkprothese mit kurzen, mittellangen oder langen Halslängen der Kugelköpfe (2) und einem Durchmesser der Kugelköpfe (2) von 28 mm, nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Länge der Kontaktfläche (3) – bei kurzen Halslängen zwischen 9 bis 12 mm, – bei mittellangen Halslängen zwischen 6 bis 8 mm und – bei langen Halslängen zwischen 5 bis 8 mm liegt.Hip joint prosthesis with short, medium or long neck lengths of the ball heads ( 2 ) and a diameter of the ball heads ( 2 ) of 28 mm, according to claim 1 or 2, characterized in that the length of the contact surface ( 3 ) - for short neck lengths between 9 to 12 mm, - for medium-length neck lengths between 6 to 8 mm and - for long neck lengths between 5 to 8 mm.
DE4405447A 1994-02-21 1994-02-21 hip prosthesis Expired - Fee Related DE4405447B4 (en)

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7220283B2 (en) * 2005-01-24 2007-05-22 Exactech, Inc. Prosthesis including a mechanism for attaching a first component to a second component
US10136933B2 (en) 2012-10-30 2018-11-27 Zimmer, Inc. Orthopedic connections
EP3788991B1 (en) 2019-09-06 2023-06-28 CeramTec GmbH Connecting assembly of two components

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2134316A1 (en) * 1970-07-10 1972-01-13 Ceraver, Paris Sintered clay bone prosthesis
US4170794A (en) * 1977-03-23 1979-10-16 Rosenthal Technik Ag Bone joint endoprosthesis
DE2933961A1 (en) * 1979-08-22 1981-03-12 Rosenthal Technik Ag, 8672 Selb COMPOSITE ENDOPROTHESIS FROM A METAL SHAFT AND A CERAMIC JOINT PART
DE2451275C2 (en) * 1974-10-29 1982-08-26 Feldmühle AG, 4000 Düsseldorf Head part of a hip joint prosthesis to be implanted
US4964869A (en) * 1988-06-28 1990-10-23 Ceramiques Techniques Desmarquest Assembly of a ceramic head on a metal rod for a hip prosthesis
US5037441A (en) * 1989-06-28 1991-08-06 La Biomecanique Integree Rotule pour prothese
DE4035614C2 (en) * 1990-11-09 1993-01-28 Friedrichsfeld Ag Keramik- Und Kunststoffwerke, 6800 Mannheim, De
GB2260705A (en) * 1991-10-08 1993-04-28 Kevin Hardinge Ceramic/metal prosthesis
DE69000445T2 (en) * 1989-03-23 1993-06-03 Desmarquest Ceramiques Tech CERAMIC BALL HEAD WITH A SMALL DIAMETER FOR A HIP JOINT PROSTHESIS.
DE69001147T2 (en) * 1989-02-28 1993-08-12 Osteonics Corp THIGH HEAD ADJUSTER FOR MOUNTING DURING THE OPERATION.

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2134316A1 (en) * 1970-07-10 1972-01-13 Ceraver, Paris Sintered clay bone prosthesis
DE2451275C2 (en) * 1974-10-29 1982-08-26 Feldmühle AG, 4000 Düsseldorf Head part of a hip joint prosthesis to be implanted
US4170794A (en) * 1977-03-23 1979-10-16 Rosenthal Technik Ag Bone joint endoprosthesis
DE2933961A1 (en) * 1979-08-22 1981-03-12 Rosenthal Technik Ag, 8672 Selb COMPOSITE ENDOPROTHESIS FROM A METAL SHAFT AND A CERAMIC JOINT PART
US4964869A (en) * 1988-06-28 1990-10-23 Ceramiques Techniques Desmarquest Assembly of a ceramic head on a metal rod for a hip prosthesis
DE69001147T2 (en) * 1989-02-28 1993-08-12 Osteonics Corp THIGH HEAD ADJUSTER FOR MOUNTING DURING THE OPERATION.
DE69000445T2 (en) * 1989-03-23 1993-06-03 Desmarquest Ceramiques Tech CERAMIC BALL HEAD WITH A SMALL DIAMETER FOR A HIP JOINT PROSTHESIS.
US5037441A (en) * 1989-06-28 1991-08-06 La Biomecanique Integree Rotule pour prothese
DE4035614C2 (en) * 1990-11-09 1993-01-28 Friedrichsfeld Ag Keramik- Und Kunststoffwerke, 6800 Mannheim, De
GB2260705A (en) * 1991-10-08 1993-04-28 Kevin Hardinge Ceramic/metal prosthesis

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