EP1152717A1 - Assemblage par blocage entre des composants de protheses d'articulation - Google Patents

Assemblage par blocage entre des composants de protheses d'articulation

Info

Publication number
EP1152717A1
EP1152717A1 EP00901537A EP00901537A EP1152717A1 EP 1152717 A1 EP1152717 A1 EP 1152717A1 EP 00901537 A EP00901537 A EP 00901537A EP 00901537 A EP00901537 A EP 00901537A EP 1152717 A1 EP1152717 A1 EP 1152717A1
Authority
EP
European Patent Office
Prior art keywords
fit connection
press fit
ball head
coupling element
connection according
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.)
Withdrawn
Application number
EP00901537A
Other languages
German (de)
English (en)
Inventor
Hans-Georg Pfaff
Robert Rack
Paul Silberer
Wilfried Von Chamier
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.)
Ceramtec GmbH
Original Assignee
Ceramtec GmbH
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 Ceramtec GmbH filed Critical Ceramtec GmbH
Publication of EP1152717A1 publication Critical patent/EP1152717A1/fr
Withdrawn legal-status Critical Current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
    • A61F2/3094—Designing or manufacturing processes
    • A61F2/30965—Reinforcing the prosthesis by embedding particles or fibres during moulding or dipping
    • 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
    • A61F2/32—Joints for the hip
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—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
    • A61F2002/30108—Shapes
    • A61F2002/30199—Three-dimensional shapes
    • A61F2002/30205—Three-dimensional shapes conical
    • A61F2002/30217—Three-dimensional shapes conical hollow cones, e.g. tubular-like cones
    • 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
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30474—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using an intermediate sleeve interposed between both prosthetic parts to be coupled
    • A—HUMAN NECESSITIES
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    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30563—Special structural features of bone or joint prostheses not otherwise provided for having elastic means or damping means, different from springs, e.g. including an elastomeric core or shock absorbers
    • 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
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30907—Nets or sleeves applied to surface of prostheses or in cement
    • A61F2002/30909—Nets
    • A61F2002/30914—Details of the mesh structure, e.g. disposition of the woven warp and weft wires
    • 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
    • A61F2/3094—Designing or manufacturing processes
    • A61F2002/30968—Sintering
    • 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
    • A61F2002/3611—Heads or epiphyseal parts of femur
    • 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
    • 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
    • A61F2/40—Joints for shoulders
    • A61F2/4014—Humeral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic humeral shafts
    • A61F2002/4037—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
    • 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
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    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0063—Three-dimensional shapes
    • A61F2230/0067—Three-dimensional shapes conical
    • A—HUMAN NECESSITIES
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    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • 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
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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
    • A61F2310/00023—Titanium or titanium-based alloys, e.g. Ti-Ni alloys
    • A—HUMAN NECESSITIES
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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
    • A61F2310/00029—Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
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    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00161—Carbon; Graphite
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    • 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

Definitions

  • the invention relates to a press fit connection between prosthesis components of joint prostheses according to the preamble of the first claim.
  • Hip joint endoprostheses for example, consist of the socket, which is inserted into the hip bone, and the shaft, which is inserted into the thigh bone.
  • the pan usually consists of a metallic outer shell into which an insert shell made of ceramic material or a biocompatible plastic is inserted.
  • the clamp seat connection is used here as the connection technology.
  • a press fit connection is known for example from DE 196 11 248 A1.
  • the shaft has a pin, the so-called cone, on which the ball head is attached.
  • implant components of different materials and sizes are connected to each other to adapt to the patient's physique.
  • ball heads made of a cobalt-chromium alloy or made of an aluminum oxide ceramic are placed on a cone made of titanium.
  • the clamp seat connection is also used here, in particular the conical clamp.
  • the ball head is placed on the cone with a conical hole. After attaching the ball head to the cone, the fixation is done by a blow on the ball head.
  • the object of the present invention is to present an improved press fit connection between the ball head and the cone in the case of joint prostheses.
  • the surface structure and the internal structure of the coupling element in particular its porosity, its elasticity and damping properties, and thereby the introduction of force into the body coupled to it, are predetermined by a specific design. Due to the clamp seat connection according to the invention with a porous coupling element with a structured surface, it is also possible to replace damaged ball heads without having to remove the shaft, even if the condition of the surface of the cone would no longer allow the ball heads to be fitted directly.
  • porous coupling elements can be produced as a winding body.
  • the porosity of the winding body and its surface structure can be controlled by a targeted placement of the threads on a body that has at least approximately the shape that the coupling element is to receive.
  • the porosity can be in the case of cylindrical or conically shaped packages, such as those found on winding machines
  • Sleeves can be wound by setting the crossing angle, the spacing of the threads placed next to each other (thread stroke) and the thread tension during the winding process.
  • the coupling element can also have a fabric-like structure.
  • the weave d. H. the distance between the threads and their Ver Verechtung, the porosity and surface quality, the roughness, can be influenced.
  • the construction of a coupling element from several fabric layers also gives the possibility to influence the porosity and thus its deformability.
  • the surface structure of the bobbins and the fabrics is essentially determined by the thread diameter, the thread shape - flat, round or twisted, and the placement or interlacing of the threads. Because the threads can be processed both with the winding body and with a fabric-like structure with variable distances from one another, elevations arise on the surface of the winding body or the fabric at the crossing points of the threads, while the pores arise due to the spacing between the threads. On the surface, therefore, the points of intersection and the spacing of the threads from one another influence the structure, the roughness, of the coupling element.
  • the threads of the winding body or the fabric are made of a biocompatible material. All materials that are already considered to be biocompatible in prosthetics are suitable as materials.
  • the threads can therefore be made of metal or a metal alloy such as chrome, tungsten chrome, cobalt chrome and titanium, for example.
  • threads of carbon have proven which have a particularly high tensile strength and also consist of an element that is present in the body itself. In particular, with threads made of carbon, it is possible to design a coupling element in such a way that it does not deform in the direction of its surface area under load.
  • the threads or the thread layers are fixed in their position by a fixing means.
  • a fixing means for example, epoxy resins can be used as fixing agents.
  • the fixing agent must consist of a bio-inert or biocompatible material.
  • coupling elements in addition to winding bodies and fabrics, can also be produced as sintered bodies or sponge bodies.
  • coupling elements can be sintered in any desired shape from balls or grains of a biocompatible material, in particular from the known biocompatible metals already mentioned above, the pore size within the sintered body and its surface structure being determined simultaneously by the ball size or grain size.
  • sponge bodies which can be produced, for example, by gassing metal melts, the pore content and the pore size can be influenced by appropriate supply of the fumigant.
  • the coupling element for a ball head can have a wall thickness between 0.3 mm and about 2 mm, depending on the expected load and size of the endoprosthesis. A range between 0.5 mm and 1 mm is preferred.
  • the wall thickness of the coupling element is taken into account when making the conical hole in the ball head.
  • the pore proportion of the coupling element can be adjusted to a proportion between 20% and 90%, adjusted to the desired elasticity and damping, a pore proportion of approximately 40% being regarded as optimal. The higher the proportion of pores, the more elastic the coupling element behaves. The roughness of the surface of the coupling element also exerts an influence on the elasticity and damping.
  • the surface roughness 5 is also adapted to the endoprosthesis and can be between 2 ⁇ m and 300 ⁇ m with a roughness depth Ra.
  • the surface structure i.e. H. the surface roughness, as explained above, is influenced by the winding process or the weaving process or the sintering technique or the I 0 pore generation.
  • the structure and thus the roughness can be influenced in a targeted manner by subsequent processing of the surface, for example by grinding, sandblasting or overturning.
  • FIG. 1 shows a clamp-seat connection according to the invention, consisting of a cone and a ceramic ball head, shown in section, placed on the cone, a coupling element being arranged between the cone and the ball head,
  • FIG. 2 shows a coupling element, which is formed from a winding body, partially cut
  • FIG. 3 shows a section of a coupling element which has a fabric-like structure
  • Figure 4 is a coupling element, which is a porous sintered body, partially cut, and
  • Figure 5 is a coupling element, which is a sponge body, partially cut
  • a shaft 2 carries a ball head 3 made of ceramic, for example made of aluminum oxide.
  • the ball head 3 has one Conical bore 4 for receiving the cone 5 of the shaft 2 on the shaft 2 and its cone 5 are made of a titanium alloy, for example T.AI6V4, in the present exemplary embodiment.
  • T.AI6V4 titanium alloy
  • FIG. 2 shows a section of the coupling element 6, which in the present exemplary embodiment was formed from a winding body.
  • Five thread layers 7a to 7e, one above the other, are clearly visible, which in the non-deformed state result in the wall thickness d of the winding body.
  • the individual threads 8 are next to one another filed As can be seen from the illustration, their diameter 9 and their distance 10 from each other determine the dimensions of the pores 11. At the same time it can be seen that the diameter 9 of the thread 8 on the surface 12 essentially determines the roughness 13. Furthermore, the diameter and the depth of the Pores 11, which are connected to the surface 12 and are thus open, influence the roughness 13 of the surface 12.
  • the position of the threads is fixed by means of a fixing agent 14, for example by means of an epoxy resin
  • FIG. 3 shows the structure of a further exemplary embodiment of a coupling element 15, which is constructed from two fabric layers A and B. It can also be clearly seen here that the diameter 16 of the thread 17 and its distance 18 from one another within the respective fabric layer A or B and between the individual fabric layers A and B influence the size of the pores 19 and the structure of the surface 20 and thus the roughness 21.
  • FIG. 4 shows a section of another exemplary embodiment of a coupling element 22, which is a sintered body.
  • the sintered body 22 with the wall thickness d consists of balls 23 of a biocompatible metal sintered together.
  • the diameter 24 of the balls 23 determines the dimensions of the pores 25 and the surface structure of the surface 26 and thus their roughness 27.
  • FIG. 5 shows a section of a coupling element 28, which is a sponge body.
  • the structure of the coupling element 28 is a sponge body.
  • Embodiment determined by the size of the pores 29 which are introduced into the biocompatible metal 30.
  • the pores are irregularly shaped and partially connected and thus form a sponge structure.
  • the pores can be created in the metal by gassing or by so-called placeholders during the sintering process. Placeholders are the shape and size of fabrics

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

Abstract

Des prothèses d'articulation, dans lesquelles un partenaire d'articulation se présente sous la forme d'un cotyle et l'autre sous la forme d'une tête sphérique qui est montée de façon à pouvoir tourner dans le cotyle, sont en particulier utilisées comme prothèses de l'épaule et de la hanche. La technique d'assemblage entre les têtes sphériques métalliques ou céramiques et le cône est toujours la technique d'assemblage par blocage, en particulier par blocage d'éléments coniques. A cet effet, la tête sphérique pourvue d'un alésage conique est placée sur le cône. Après l'emmanchement de la tête sphérique sur le cône, le blocage s'effectue par un coup sur la tête sphérique. Lors d'un blocage d'éléments coniques, les surfaces de jonction de l'alésage de la tête sphérique et du cône doivent être usinées avec une précision extrême car en cas de transmission irrégulière des forces dans la tête sphérique ou dans le pivot, la tenue du blocage d'éléments coniques est compromise. Si la tête sphérique est en céramique, il peut se produire, en raison des pointes de tension dans la matière, une formation de fissures et, dans le cas le plus grave, une destruction de la tête sphérique. Selon l'invention, il est proposé d'utiliser un élément d'accouplement placé entre le cône (5) et la tête sphérique (3) avec lesquels on réalise l'assemblage par blocage (1), dont l'élasticité et les caractéristiques d'amortissement peuvent être prédéterminées grâce à sa porosité et à la structure de sa surface.
EP00901537A 1999-02-04 2000-01-13 Assemblage par blocage entre des composants de protheses d'articulation Withdrawn EP1152717A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19904437 1999-02-04
DE19904437A DE19904437A1 (de) 1999-02-04 1999-02-04 Klemmsitz-Verbindung zwischen Prothesenkomponenten von Gelenk-Prothesen
PCT/EP2000/000186 WO2000045748A1 (fr) 1999-02-04 2000-01-13 Assemblage par blocage entre des composants de protheses d'articulation

Publications (1)

Publication Number Publication Date
EP1152717A1 true EP1152717A1 (fr) 2001-11-14

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EP00901537A Withdrawn EP1152717A1 (fr) 1999-02-04 2000-01-13 Assemblage par blocage entre des composants de protheses d'articulation

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US (1) US6607560B1 (fr)
EP (1) EP1152717A1 (fr)
JP (1) JP2002536061A (fr)
AU (1) AU2289900A (fr)
DE (1) DE19904437A1 (fr)
TW (1) TW510794B (fr)
WO (1) WO2000045748A1 (fr)

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Also Published As

Publication number Publication date
US6607560B1 (en) 2003-08-19
TW510794B (en) 2002-11-21
WO2000045748A1 (fr) 2000-08-10
AU2289900A (en) 2000-08-25
DE19904437A1 (de) 2000-08-10
JP2002536061A (ja) 2002-10-29

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