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WO2004105652A1 - Joint socket for hip joint endoprothesis - Google Patents

Joint socket for hip joint endoprothesis Download PDF

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Publication number
WO2004105652A1
WO2004105652A1 PCT/EP2004/005113 EP2004005113W WO2004105652A1 WO 2004105652 A1 WO2004105652 A1 WO 2004105652A1 EP 2004005113 W EP2004005113 W EP 2004005113W WO 2004105652 A1 WO2004105652 A1 WO 2004105652A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressfit
socket
conical
pan according
cup
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.)
Ceased
Application number
PCT/EP2004/005113
Other languages
German (de)
French (fr)
Inventor
Martin Imhof
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP04732579A priority Critical patent/EP1633289A1/en
Publication of WO2004105652A1 publication Critical patent/WO2004105652A1/en
Anticipated expiration legal-status Critical
Ceased 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
    • A61F2/30767—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
    • A61F2/30767—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
    • 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
    • A61F2002/30205—Three-dimensional shapes conical
    • A61F2002/30214—Three-dimensional shapes conical having tapered sections of different conicities
    • 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
    • A61F2002/30345—Multiple conical connection, i.e. the protrusion and recess having several tapered sections of different complementary conicities
    • 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
    • A61F2002/3412—Acetabular cups with pins or protrusions, e.g. non-sharp pins or protrusions projecting from a shell 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
    • A61F2/32—Joints for the hip
    • A61F2/34—Acetabular cups
    • A61F2002/3453—Acetabular cups having a non-hemispherical convex outer surface, e.g. quadric-shaped
    • A61F2002/3456—Acetabular cups having a non-hemispherical convex outer surface, e.g. quadric-shaped ellipsoidal or having a flattened polar region
    • 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
    • A61F2002/3453—Acetabular cups having a non-hemispherical convex outer surface, e.g. quadric-shaped
    • A61F2002/3462—Acetabular cups having a non-hemispherical convex outer surface, e.g. quadric-shaped having a frustoconical external shape, e.g. entirely frustoconical
    • 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
    • A61F2002/3453—Acetabular cups having a non-hemispherical convex outer surface, e.g. quadric-shaped
    • A61F2002/3466—Acetabular cups having a non-hemispherical convex outer surface, e.g. quadric-shaped having a cylindrical external shape, e.g. entirely cylindrical
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • 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
    • 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
    • A61F2230/0067—Three-dimensional shapes conical
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00011—Metals or alloys
    • A61F2310/00023—Titanium or titanium-based alloys, e.g. Ti-Ni alloys

Definitions

  • the invention relates to a pressfit cup for hip joint endoprostheses according to the preamble of claim 1.
  • hip joint socket of the pelvic bone is replaced by an artificial socket implanted in the bone. It is known to use either a screw pan or a Pfessfit pan.
  • Screw pans have an external thread on the outer surface, which forms the contact surface with the bone, with which they can be screwed, preferably self-tapping, into a corresponding milling of the pelvic bone.
  • Pressfit pans are pressed into a corresponding cutout in the pelvic bone and held in a snug fit.
  • the surface can have a structure to ensure that the press-fit socket is anchored in the cutout.
  • the press fit cup can exert pressure on the surrounding bone through the fit, which can lead to damage to the bone tissue, which can impair the growth of the bone to the pressfit cup or even cause the pressfit cup to loosen.
  • EP 0 381 351 B1 discloses an acetabular cup with an outer surface contour which can be subdivided into two essentially spherical surface areas with two different radii.
  • a hip joint socket is known from EP 0 732 903 B1, the convex outer surface of which corresponds to the surface of a half ellipsoid of revolution.
  • a disadvantage of such curved or conical press-fit pans is that they partially convert a force caused by the elastic pelvic movement in the plane of the pelvic bone through the outer surface of the press-fit pan inclined towards the force into an axial force which is in the direction of pressing out the Pressfit pan from the pelvic bone works.
  • the object of the invention is to provide a pressfit cup for hip joint endoprostheses, which ensures improved anchoring of the pressfit cup in the pelvic bone.
  • the pressfit pan has an outer surface which is cylindrical in shape in the equatorial edge region of the pressfit pan, at least one conical section adjoining this region.
  • a conical section which is flattened in the pole area, is sufficient to achieve the desired effect.
  • the elastic deformation of the pelvic bone essentially causes radially acting forces in the plane of the pelvic bone.
  • the outer surface of the pressfit socket which is inclined against the force, partially converts this into an axial force, which can result in the pressfit socket being pressed out of the pelvic bone and thus loosened.
  • the equatorial edge region of the pressfit cup is cylindrical in accordance with the invention, since in this case a force acting in the plane of the pelvic bone on the surface of the pressfit cup consists exclusively of a radial force component that comes from the pressfit cup can be taken up without straining the anchoring of the Pressfit cup in the cutout of the pelvic bone.
  • the outer surface of the pressfit cup is structured, preferably roughened or has projections in order to additionally secure the pressfit cup against loosening in and pushing it out of the pelvic bone.
  • the pressfit pan is preferably made of metal, particularly preferably the pressfit pan is made of a biocompatible metal such as titanium or a titanium alloy.
  • the inner recess of the press-fit socket, into which the bearing shell for the joint head is inserted, is advantageously conical, so that the bearing shell can be held in the socket by means of a self-locking cone effect.
  • Figure 1 shows a half axial section through a pressfit pan according to the invention.
  • FIG. 1 shows an axial section through a pressfit pan 10, the outer surface of which is cylindrically shaped in the equatorial edge region 30 of the pan.
  • the equatorial edge region 30 is adjoined by two regions 20 and 25, in which the outer surfaces of the pressfit socket are conically shaped.
  • the conical region 20 directly adjoining the equatorial edge region 30 has a cone angle of approximately 20 °.
  • Advantageous values for the cone angle of the first conical region 20 are between 10 ° and 40 °.
  • the first conical region 20 is adjoined by the second conical region 25, which has a cone angle of approximately 75 °.
  • the cone angle of the second conical region is advantageously between 50 ° and 85 °.
  • the pressfit socket 10 has an inner recess 40 for an insert, not shown, which receives the joint head.
  • the inner recess 40 is formed in a manner known per se with a conical surface, the conical angle of which can be selected in accordance with the material pairing of press-fit socket 10 and insert in such a way that a self-locking conical effect holds the insert in press-fit socket 10. It is also possible that the inner recess 40 has a surface consisting of several conical sections.

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

The invention relates to a pressfit socket for a hip joint endoprothesis having an outer surface and an inner recess, wherein the outer surface is cylindrically formed in an equatorial peripheral area that is adjoined by at least one conical section.

Description

Beschreibungdescription

Gelenk-Pfanne für Hüftgelenk-EndoprothesenJoint socket for hip joint endoprostheses

Die Erfindung betrifft eine Pressfit-Pfanne für Hüftgelenk- Endoprothesen gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a pressfit cup for hip joint endoprostheses according to the preamble of claim 1.

Bei Hüftgelenk-Endoprothesen wird die Hüftgelenkpfanne des Beckenknochens durch eine in den Knochen implantierte künstliche Pfanne ersetzt. Dabei ist es bekannt, entweder eine Schraubpfanne oder eine Pfessfit-Pfanne zu verwenden.In hip joint endoprostheses, the hip joint socket of the pelvic bone is replaced by an artificial socket implanted in the bone. It is known to use either a screw pan or a Pfessfit pan.

Schraubpfannen weisen auf der Außenfläche, welche die Kontaktfläche zum Knochen bildet, ein Außengewinde auf, mit welchem sie vorzugsweise selbstschneidend in eine entsprechende Aus- fräsung des Beckenknochens eingeschraubt werden können.Screw pans have an external thread on the outer surface, which forms the contact surface with the bone, with which they can be screwed, preferably self-tapping, into a corresponding milling of the pelvic bone.

Pressfit-Pfannen werden in eine entsprechende Ausfräsung des Beckenknochens eingepresst und im Passsitz gehalten. Zusätzlich kann die Oberfläche eine Struktur aufweisen, um die Verankerung der Pressfit-Pfanne in der Ausfräsung zu gewährleisten. Durch den Passsitz kann von der Pressfit-Pfanne Druck auf den umliegenden Knochen ausgeübt werden, was zu einer Schädigung des Knochengewebes führen kann, die das Anwachsen des Knochens an die Pressfit-Pfanne beeinträchtigen oder sogar eine Lockerung der Pressfit-Pfanne bewirken kann.Pressfit pans are pressed into a corresponding cutout in the pelvic bone and held in a snug fit. In addition, the surface can have a structure to ensure that the press-fit socket is anchored in the cutout. The press fit cup can exert pressure on the surrounding bone through the fit, which can lead to damage to the bone tissue, which can impair the growth of the bone to the pressfit cup or even cause the pressfit cup to loosen.

Die Elastizität des Beckenknochens führt außerdem bei wechselnder Belastung zu in der Ebene des Beckenknochens radial auf die Pressfit-Pfanne wirkenden Kräften. Diese Kräfte können ebenfalls zu einer Lockerung der Pressfit-Pfanne führen. Aus der WO 00/74604 AI sind Hüftgelenkspfannen bekannt, welche eine konische Außenkontur aufweisen. Des Weiteren offenbart diese Druckschrift eine Gelenkpfanne, welche im äquatorialen - Bereich eine konische Außenkontur aufweist, an welche sich ein sphärisch ausgebildeter Polbereich anschließt.The elasticity of the pelvic bone also leads to forces acting radially on the press-fit socket in the pelvic bone plane when the load changes. These forces can also cause the pressfit pan to loosen. From WO 00/74604 AI acetabular cups are known which have a conical outer contour. Furthermore, this document discloses an articular socket which has a conical outer contour in the equatorial region, to which a spherically formed pole region adjoins.

Die EP 0 381 351 Bl offenbart eine Hüftgelenkspfanne mit einer Außenflächenkontur, welche sich in zwei im wesentlichen sphärische Oberflächenbereiche mit zwei unterschiedlichen Radien unterteilen lässt.EP 0 381 351 B1 discloses an acetabular cup with an outer surface contour which can be subdivided into two essentially spherical surface areas with two different radii.

Aus der EP 0 732 903 Bl ist eine Hüftgelenkspfanne bekannt, deren konvexe Außenoberfläche der Oberfläche eines halben Rotationsellipsoids entspricht.A hip joint socket is known from EP 0 732 903 B1, the convex outer surface of which corresponds to the surface of a half ellipsoid of revolution.

Ein Nachteil derartig gewölbter oder konischer Pressfit- Pfannen ist, dass diese eine durch die elastische Beckenbewegung verursachte in der Ebene des Beckenknochens wirkende Kraft durch die gegen die Kraft geneigte Außenfläche der Pressfit-Pfanne teilweise in eine axiale Kraft umsetzen, welche in Richtung eines Herausdrückens der Pressfit-Pfanne aus dem Beckenknochen wirkt .A disadvantage of such curved or conical press-fit pans is that they partially convert a force caused by the elastic pelvic movement in the plane of the pelvic bone through the outer surface of the press-fit pan inclined towards the force into an axial force which is in the direction of pressing out the Pressfit pan from the pelvic bone works.

Die Aufgabe der Erfindung besteht darin, eine Pressfit-Pfanne für Hüftgelenk-Endoprothesen zur Verfügung zu stellen, welche eine verbesserte Verankerung der Pressfit-Pfanne im Beckenknochen gewährleistet.The object of the invention is to provide a pressfit cup for hip joint endoprostheses, which ensures improved anchoring of the pressfit cup in the pelvic bone.

Diese Aufgabe wird erfindungsgemäß gelöst durch eine Pressfit- Pfanne für Hüftgelenk-Endoprothesen mit den Merkmalen des Patentanspruchs 1. Erfindungsgemäß weist die Pressfit-Pfanne eine Außenfläche auf, welche im äquatorialen Randbereich der Pressfit-Pfanne zylindrisch geformt ist, wobei sich an diesen Bereich wenigstens ein konischer Abschnitt anschließt.This object is achieved according to the invention by a pressfit cup for hip joint endoprostheses with the features of claim 1. According to the invention, the pressfit pan has an outer surface which is cylindrical in shape in the equatorial edge region of the pressfit pan, at least one conical section adjoining this region.

Vorteilhafterweise reicht bereits ein konischer Abschnitt, welcher im Polbereich abgeflacht ist, aus, um die erwünschte Wirkung zu erzielen.Advantageously, a conical section, which is flattened in the pole area, is sufficient to achieve the desired effect.

Die elastische Verformung des Beckenknochens bewirkt im wesentlichen radial wirkende Kräfte in der Ebene des Beckenknochens. Diese werden bei einer konischen Pressfit-Pfanne durch die gegen die Kraft geneigte Außenfläche der Pressfit-Pfanne teilweise in eine axiale Kraft umgesetzt, welche zu einem Herausdrücken der Pressfit-Pfanne aus der Ausfräsung des Beckenknochens und damit zu einer Lockerung führen kann. Um diesen Effekt zu verringern, ist erfindungsgemäß der äquatoriale Randbereich der Pressfit-Pfanne zylindrisch ausgebildet, da in diesem Fall eine in der Ebene des Beckenknochens wirkende Kraft auf die Oberfläche der Pressfit-Pfanne ausschließlich aus einer radialen Kraftkomponente besteht, die von der Pressfit-Pfanne aufgenommen werden kann ohne die Verankerung der Pressfit-Pfanne in der Ausfräsung des Beckenknochens zu belasten.The elastic deformation of the pelvic bone essentially causes radially acting forces in the plane of the pelvic bone. In the case of a conical pressfit socket, the outer surface of the pressfit socket, which is inclined against the force, partially converts this into an axial force, which can result in the pressfit socket being pressed out of the pelvic bone and thus loosened. In order to reduce this effect, the equatorial edge region of the pressfit cup is cylindrical in accordance with the invention, since in this case a force acting in the plane of the pelvic bone on the surface of the pressfit cup consists exclusively of a radial force component that comes from the pressfit cup can be taken up without straining the anchoring of the Pressfit cup in the cutout of the pelvic bone.

Bei einer vorteilhaften Ausführung der Erfindung ist die Außenfläche der Pressfit-Pfanne strukturiert, vorzugsweise auf- geraut oder weist Vorsprünge auf, um die Pressfit-Pfanne zusätzlich gegen Lockerung im und Herausdrücken aus dem Beckenknochen zu sichern. Vorzugsweise ist die Pressfit-Pfanne aus Metall gefertigt, besonders bevorzugt ist die Pressfit-Pfanne aus einem biokompatiblen Metall wie Titan oder einer Titanlegierung gefertigt.In an advantageous embodiment of the invention, the outer surface of the pressfit cup is structured, preferably roughened or has projections in order to additionally secure the pressfit cup against loosening in and pushing it out of the pelvic bone. The pressfit pan is preferably made of metal, particularly preferably the pressfit pan is made of a biocompatible metal such as titanium or a titanium alloy.

Vorteilhafterweise ist die innere Ausnehmung der Pressfit- Pfanne, in welche die Lagerschale für den Gelenkkopf eingesetzt wird, konisch ausgebildet, so dass die Lagerschale über eine selbsthemmende Konuswirkung in der Pfanne gehalten werden kann.The inner recess of the press-fit socket, into which the bearing shell for the joint head is inserted, is advantageously conical, so that the bearing shell can be held in the socket by means of a self-locking cone effect.

Ein Ausführungsbeispiel der Erfindung wird anhand der folgenden Figur erläutert.An embodiment of the invention is explained with reference to the following figure.

Es zeigtIt shows

Figur 1 einen halben Axialschnitt durch eine erfindungsgemäße Pressfit-Pfanne .Figure 1 shows a half axial section through a pressfit pan according to the invention.

Figur 1 zeigt einen Axialschnitt durch eine Pressfit-Pfanne 10, deren Außenfläche im äquatorialen Randbereich 30 der Pfanne zylindrisch geformt ist. An den äquatorialen Randbereich 30 schließen sich zwei Bereiche 20 und 25 an, in welchen die Außenflächen der Pressfit-Pfanne konisch geformt ist. Der direkt an den äquatorialen Randbereich 30 angrenzende konische Bereich 20 weist einen Konuswinkel von etwa 20° auf. Vorteilhafte Werte für den Konuswinkel des ersten konischen Bereichs 20 liegen zwischen 10° und 40°. An den ersten konischen Bereich 20 schließt sich der zweite konische Bereich 25 an, welcher einen Konuswinkel von etwa 75° aufweist. Vorteilhafterweise liegt der Konuswinkel des zweiten konischen Bereichs zwischen 50° und 85°. An die zweiten konischen Bereich 25 schließt sich ein abgeflachter Polbereich 50 der Pressfit-Pfanne an. Die Pressfit-Pfanne 10 weist eine innere Ausnehmung 40 für einen nicht dargestellten Einsatz auf, welcher den Gelenkkopf aufnimmt. Die innere Ausnehmung 40 ist in an sich bekannter Weise mit einer Konusfläche ausgebildet, deren Konuswinkel entsprechend der Materialpaarung von Pressfit-Pfanne 10 und Einsatz so gewählt werden kann, dass eine selbsthemmende Konuswirkung den Einsatz in der Pressfit-Pfanne 10 hält. Dabei ist es auch möglich, dass die innere Ausnehmung 40 eine aus mehreren konischen Abschnitten bestehende Fläche aufweist. FIG. 1 shows an axial section through a pressfit pan 10, the outer surface of which is cylindrically shaped in the equatorial edge region 30 of the pan. The equatorial edge region 30 is adjoined by two regions 20 and 25, in which the outer surfaces of the pressfit socket are conically shaped. The conical region 20 directly adjoining the equatorial edge region 30 has a cone angle of approximately 20 °. Advantageous values for the cone angle of the first conical region 20 are between 10 ° and 40 °. The first conical region 20 is adjoined by the second conical region 25, which has a cone angle of approximately 75 °. The cone angle of the second conical region is advantageously between 50 ° and 85 °. A flattened pole region 50 of the press-fit socket adjoins the second conical region 25. The pressfit socket 10 has an inner recess 40 for an insert, not shown, which receives the joint head. The inner recess 40 is formed in a manner known per se with a conical surface, the conical angle of which can be selected in accordance with the material pairing of press-fit socket 10 and insert in such a way that a self-locking conical effect holds the insert in press-fit socket 10. It is also possible that the inner recess 40 has a surface consisting of several conical sections.

Claims

Patentansprüche claims 1. Pressfit-Pfanne für Hüftgelenk-Endoprothesen mit einer Außenfläche und einer inneren Ausnehmung, dadurch gekennzeichnet, dass die Außenfläche in einem äquatorialen Randbereich zylindrisch geformt ist, an welchen sich wenigstens ein konischer Abschnitt anschließt.1. Pressfit cup for hip joint endoprostheses with an outer surface and an inner recess, characterized in that the outer surface is cylindrical in an equatorial edge region, which is followed by at least one conical section. 2. Pressfit-Pfanne nach Anspruch 1, dadurch gekennzeichnet, dass sich an den zylindrischen Randbereich genau zwei konische Abschnitte anschließen.2. Pressfit pan according to claim 1, characterized in that exactly two conical sections adjoin the cylindrical edge region. 3. Pressfit-Pfanne nach Anspruch 1, dadurch gekennzeichnet, dass sich an den zylindrischen Randbereich genau ein konischer Abschnitt anschließt.3. Pressfit pan according to claim 1, characterized in that exactly one conical section adjoins the cylindrical edge region. 4. Pressfit-Pfanne nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Außenfläche im Polbereich abgeflacht ist.4. Pressfit pan according to one of the preceding claims, characterized in that the outer surface is flattened in the pole area. 5. Pressfit-Pfanne nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Außenfläche eine Oberflächenstruktur, vorzugsweise eine aufgeraute Oberfläche und/oder Vorsprünge aufweist.5. Pressfit pan according to one of the preceding claims, characterized in that the outer surface has a surface structure, preferably a roughened surface and / or projections. 6. Pressfit-Pfanne nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Pressfit-Pfanne aus Metall gefertigt ist.6. Pressfit pan according to one of the preceding claims, characterized in that the pressfit pan is made of metal. 7. Pressfit-Pfanne nach Anspruch 6, dadurch gekennzeichnet, dass die Pressfit-Pfanne aus Titan oder einer Titanlegierung gefertigt ist. Pressfit-Pfanne nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die innere Ausnehmung konisch ausgebildet ist . 7. Pressfit pan according to claim 6, characterized in that the pressfit pan is made of titanium or a titanium alloy. Pressfit pan according to one of the preceding claims, characterized in that the inner recess is conical.
PCT/EP2004/005113 2003-05-28 2004-05-13 Joint socket for hip joint endoprothesis Ceased WO2004105652A1 (en)

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EP04732579A EP1633289A1 (en) 2003-05-28 2004-05-13 Joint socket for hip joint endoprothesis

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DE10324184A DE10324184B4 (en) 2003-05-28 2003-05-28 Joint socket for hip joint endoprostheses
DE10324184.1 2003-05-28

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DE10324184A1 (en) 2004-12-30
DE10324184B4 (en) 2005-05-19

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