DE2527865A1 - Kuenstliche gelenkpfanne - Google Patents

Kuenstliche gelenkpfanne

Info

Publication number
DE2527865A1
DE2527865A1 DE19752527865 DE2527865A DE2527865A1 DE 2527865 A1 DE2527865 A1 DE 2527865A1 DE 19752527865 DE19752527865 DE 19752527865 DE 2527865 A DE2527865 A DE 2527865A DE 2527865 A1 DE2527865 A1 DE 2527865A1
Authority
DE
Germany
Prior art keywords
joint
socket
joint socket
head
shell
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.)
Granted
Application number
DE19752527865
Other languages
English (en)
Other versions
DE2527865B2 (de
DE2527865C3 (de
Inventor
O Frey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sulzer AG
Original Assignee
Sulzer AG
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 Sulzer AG filed Critical Sulzer AG
Publication of DE2527865A1 publication Critical patent/DE2527865A1/de
Publication of DE2527865B2 publication Critical patent/DE2527865B2/de
Application granted granted Critical
Publication of DE2527865C3 publication Critical patent/DE2527865C3/de
Expired legal-status Critical Current

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
    • A61F2/34—Acetabular cups
    • 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
    • A61F2002/30199—Three-dimensional shapes
    • A61F2002/30289—Three-dimensional shapes helically-coiled
    • 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
    • A61F2002/30621—Features concerning the anatomical functioning or articulation of the prosthetic joint
    • A61F2002/30649—Ball-and-socket joints
    • A61F2002/30654—Details of the concave socket
    • A61F2002/30655—Non-spherical concave inner surface
    • 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
    • A61F2002/30621—Features concerning the anatomical functioning or articulation of the prosthetic joint
    • A61F2002/30649—Ball-and-socket joints
    • A61F2002/30654—Details of the concave socket
    • A61F2002/30655—Non-spherical concave inner surface
    • A61F2002/30657—Non-spherical concave inner surface made of different partially-spherical concave portions
    • A61F2002/3066—Non-spherical concave inner surface made of different partially-spherical concave portions having a central non-conforming area surrounded by a peripheral annular conforming area
    • 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
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    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30621—Features concerning the anatomical functioning or articulation of the prosthetic joint
    • A61F2002/30649—Ball-and-socket joints
    • A61F2002/30662—Ball-and-socket joints with rotation-limiting means
    • 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
    • A61F2002/30667—Features concerning an interaction with the environment or a particular use of the prosthesis
    • A61F2002/30673—Lubricating means, e.g. synovial pocket
    • 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
    • A61F2002/30795—Blind bores, e.g. of circular cross-section
    • 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
    • A61F2002/3082—Grooves
    • 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
    • A61F2002/3082—Grooves
    • A61F2002/30822—Circumferential grooves
    • 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
    • A61F2002/3082—Grooves
    • A61F2002/30827—Plurality of grooves
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
    • A61F2002/30879—Ribs
    • 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
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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
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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
    • A61F2/32—Joints for the hip
    • A61F2002/3225—Joints for the hip the diameter of the inner concave femoral head-receiving cavity of the inner acetabular shell being essentially greater than the diameter of the convex femoral head
    • 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
    • A61F2/32—Joints for the hip
    • A61F2/34—Acetabular cups
    • A61F2002/3429—Acetabular cups with an integral peripheral collar or flange, e.g. oriented away from the shell centre line
    • 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
    • A61F2/32—Joints for the hip
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    • A61F2002/3493—Spherical shell significantly greater than a hemisphere, e.g. extending over more than 200 degrees
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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
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    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3611—Heads or epiphyseal parts of femur
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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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    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2002/4631—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor the prosthesis being specially adapted for being cemented
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    • 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
    • A61F2230/0091—Three-dimensional shapes helically-coiled or spirally-coiled, i.e. having a 2-D spiral cross-section
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    • 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
    • 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

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)

Description

P. 4917
Gebrüder Sulzer, Aktiengesellschaft, Winterthur/Schweiz
Künstliche Gelenkpfanne
Die Erfindung betrifft eine künstliche Gelenkpfanne einer Totalendoprothese für ein Hüftgelenk.
Ein bei Gelenkendoprothesen bisher im allgemeinen noch nicht gelöstes Problem ist der Verschleiss an den aufeinander gleitenden Oberflächen der Prothese; vor allem bei dem hochbelasteten Gleiten des kugelförmigen Gelenkkopfes in einer Gelenkpfanne einer Totalprothese für ein Hüftgelenk versucht man daher, mit Hilfe von Körperflüssigkeit eine Flüssigkeitsschmierung zwischen den aufeinander gleitenden Flächen der genannten Elemente zu erreichen.
In diesem Zusammenhang liegt der Erfindung die Aufgabe zugrunde, diese Flüssigkeitsschmierung, die wegen der hohen Flächenpressungen und der engen zwischen der genannten Flächen verbleibenden Spalte bisher sehr oft ungenügend ist, zu verbessern.
Diese Aufgabe wird erfindungsgemäss dadurch gelöst, dass die konkave, den kugelförmigen Gelenkkopf aufnehmende Schalenfläche mindestens eine vertiefte Nut aufweist. Die erfindungsgemässe Nut ermöglicht- vor allem wenn in bekannter Weise der Durchmesser der Pfanne geringfügig grosser ist als derjenige des Gelenkkopfes -, dass die bei einer Belastung des Gelenks auf der einen Seite der Gelenkpfanne verdrängte Flüssigkeit sich in der Nut sammelt, so
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dass bei Nachlassen des Druckes zwischen den aufeinander gepressten Flächenteilen die gesammelte Flüssigkeit eine gute Benetzung dieser Flächen unter Ausbildung eines ausreichenden Schmierfilmes bewirkt, wobei aus dem bei Entlastung kleiner werdenden Volumen auf der nicht belasteten Seite des Gelenkes zusätzlich Flüssigkeit durch die Nut zwischen die zuvor aufeinander gepressten Gleitflächenteile verdrängt wird. Die erfindungsgemässe Nut kann dabei beliebig - beispielsweise als Ring- oder Schraubennut - ausgebildet sein, sofern darauf geachtet wird, dass ihre freien Enden innerhalb der durch den Gelenkkopf bei Belastungen abgedichteten hohlkugelartigen Schalenflächen liegen.
Die erfindungsgemässe Schmierwirkung kann verbessert werden, wenn die konkave Schalenfläche eine Rotationsfläche ist, deren erzeugendes Kreisbogenstück einen Radius hat, der demjenigen des zugeordneten Gelenkkopfes entspricht, dessen Mittelpunkt jedoch gegenüber der Rotationsachse einen Abstand aufweist, wobei der Abstand zweckmässlgerweise 0,1 bis 0,5 mm betragen kann. Eine weitere Verbesserung der Schmierung ergibt sich zusätzlich, wenn die Schale im Bereich ihres Scheitelpunktes eine Tasche aufweist.
Im folgenden wird die Erfindung an Hand eines Ausfuhrungsbeispiels im Zusammenhang mit der Zeichnung näher erläutert, deren einzige Figur eine Gelenkpfanne, in die der zugehörige Gelenkkopf unter einer angenommenen Belastung aus der Richtung des Pfeiles von links oben eingezeichnet ist, im Schnitt darstellt.
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D^e vergrössert dargestellte Gelenkpfanne 1, die vorteilhafterweise aus hochmolekularem Hartpolyäthylen hergestellt ist, hat auf ihrer konkaven Aussenseite ringartige Vorsprünge 2 und Vertiefungen 3, mit denen ihre Verankerung im Beckenknochen verbessert werden soll; diese Verankerung erfolgt vorzugsweise mit Hilfe eines bekannten Knochenzements auf Methylmethacrylat-Basis. Am Aequator endet die halbkugelartige Schale 1 in einen Flansch 4, der gegen die konkave, innere Schalenfläche 5 abgeschrägt ist.
Die Schale 5 dient zur Aufnahme eines kugelartigen Gelenkkopfes einer nicht weiter dargestellten, im Femurknochen verankerbaren HUftgelenkprothese; diese ist vorzugsweise aus einem der in der Implantattechnik verwendeten Metalle oder einer Metallegierung gefertigt, wobei der Kopf jedoch auch aus sogenannter Biokeramik - beispielsweise aus sehr reinem Aluminiumoxid (Al9O.,) - bestehen kann. In der Zeichnung ist die relative Lage der Pfanne 1 zum Gelenkkopf 6 so dargestellt, wie sie sich unter der Wirkung einer in Richtung des Pfeiles 8 wirkenden Belastung einstellt.
Erfindungsgemäss ist in der konkaven Schalenfläche 5 eine Nut 7 vorgesehen, die in dem gezeigten Beispiel als Ringnut ausgebildet ist.
Nach einem weiteren Gedanken der Erfindung ist die Schalenfläche nicht eine Hohlkugelfläche, sondern stellt eine Rotationsfläche dar, die durch Rotation eines Viertelkreisbogens um die Rotationsachse R entsteht, wobei der Kreisbogen den gleichen Radius wie der zugehörige Gelenkkopf 6 hat, sein Mittelpunkt M jedoch um einen
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geringen Abstand, der etwa 0,1 bis 0,5 mm beträgt, gegen die Rotationsachse R versetzt ist. Auf diese Weise erhält der Gelenkkopf 6 bei Be- und Entlastungen in der Pfanne mehr Spielraum, ohne dass dabei die bei gleichen Durchmessern von Kopf und Pfanne relativ grossen - relativ zu. denjenigen bei den bekannten Pfannen,· die einen grösseren Durchmesser als der Gelenköpf haben - tragenden Teilflächen verkleinert werden. Selbstverständlich ist jedoch eine erfindungsgemasse Nut 7 auch bei den bekannten, eine Hohlkugelfläche darstellenden Pfannen mit gegenüber dem Gelenkkopf 6 vergrössertem Durchmesser anwendbar.
Eine weitere Teilmenge von Flüssigkeit kann bei Belastung des Gelenkes in eine Tasche 9, die im Scheitelbereich der Schale 5 angeordnet ist, verdrängt und dort gespeichert werden und bei Entlastung zusätzlich als Schmierfilm auf die aufeinander gleitenden Oberflächen ausfliessen.
Die Herstellung der neuartigen Schalenfläche erfolgt beispielsweise durch spanabhebende Bearbeitung des rotierenden Pfannenkörpers 1 mit einem auf einer entsprechenden Kurve bewegten Werkzeug oder mit einem solchen, das auf einem Kreisbogen geführt und gegenüber der Rotationsachse des Körpers 1 versetzt angeordnet ist.
Wie schon kurz angedeutet, dient die erfindungsgemasse Nut 7 beim Belasten des Gelenks als Auffang- und Sammelgefäss für verdrängte Körperflüssigkeit, die dann beim Entlasten diese Flüssigkeit wieder zwischen die Gleitflächen abgibt; die gleichzeitige Verbindung mit
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einem sich beim Entlasten verkleinernden Volumen auf der zuvor entlasteten Seite des Gelenks bewirkt darüberhinaus, dass durch die Nut zusätzlich Flüssigkeit in den Bereich zwischen die beim Belasten aufeinander gleitenden Flächen gelangt.
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Claims (4)

-G- Patentansprüche
1.^Künstliche Gelenkpfanne einer Totalendoprothese für ein Hüftgelenk, dadurch gekennzeichnet, dass die konkave, den kugelförmigen Gelenkkopf (6) aufnehmende Schalenfläche (5) mindestens eine vertiefte Nut (7) aufweist.
2. Gelenkpfanne nach Anspruch 1, dadurch gekennzeichnet, dass die konkave Schalenfläche (5) eine Rotationsfläche ist, deren erzeugendes Kreisbogenstück einen Radius hat, der demjenigen des zugeordneten Gelenkkopfes (6) entspricht, dessen Mittelpunkt (M) jedoch gegenüber der Rotationsachse (R) einen Abstand aufweist.
3. Gelenkpfanne nach Anspruch 2, dadurch gekennzeichnet, dass der Abstand 0,1 - 0,5 mm beträgt.
4. Gelenkpfanne nach Anspruch 1, dadurch gekennzeichnet, dass die Schale (5) im Bereich ihres Scheitelpunktes eine Tasche (9) aufweist.
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DE2527865A 1975-06-18 1975-06-23 Künstliche Gelenkpfanne für ein Hüftgelenk Expired DE2527865C3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH789875A CH593054A5 (de) 1975-06-18 1975-06-18

Publications (3)

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DE2527865A1 true DE2527865A1 (de) 1976-12-23
DE2527865B2 DE2527865B2 (de) 1978-08-03
DE2527865C3 DE2527865C3 (de) 1979-03-15

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US (1) US4031570A (de)
JP (1) JPS522092A (de)
AT (1) AT341653B (de)
BE (1) BE843112A (de)
CA (1) CA1053851A (de)
CH (1) CH593054A5 (de)
DE (1) DE2527865C3 (de)
FR (1) FR2315903A1 (de)
GB (1) GB1499463A (de)
IT (1) IT1062971B (de)
NL (1) NL7606233A (de)
SE (1) SE7606740L (de)

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DE2742464A1 (de) * 1977-09-21 1979-03-22 Pfaudler Werke Ag Koerpergelenksendoprothese
EP1291484A1 (de) * 2001-08-27 2003-03-12 Gerald Rankl Abschattvorrichtung

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2742464A1 (de) * 1977-09-21 1979-03-22 Pfaudler Werke Ag Koerpergelenksendoprothese
EP1291484A1 (de) * 2001-08-27 2003-03-12 Gerald Rankl Abschattvorrichtung

Also Published As

Publication number Publication date
CA1053851A (en) 1979-05-08
GB1499463A (en) 1978-02-01
NL7606233A (nl) 1976-12-21
AT341653B (de) 1978-02-27
US4031570A (en) 1977-06-28
ATA475475A (de) 1977-06-15
JPS522092A (en) 1977-01-08
DE2527865B2 (de) 1978-08-03
CH593054A5 (de) 1977-11-15
DE2527865C3 (de) 1979-03-15
BE843112A (fr) 1976-12-20
FR2315903A1 (fr) 1977-01-28
IT1062971B (it) 1985-02-11
SE7606740L (sv) 1976-12-19

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