EP0637231A1 - Composants de prothese et leur procede de fabrication - Google Patents

Composants de prothese et leur procede de fabrication

Info

Publication number
EP0637231A1
EP0637231A1 EP93909838A EP93909838A EP0637231A1 EP 0637231 A1 EP0637231 A1 EP 0637231A1 EP 93909838 A EP93909838 A EP 93909838A EP 93909838 A EP93909838 A EP 93909838A EP 0637231 A1 EP0637231 A1 EP 0637231A1
Authority
EP
European Patent Office
Prior art keywords
prosthesis
bone
section
cross
density
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Withdrawn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
EP93909838A
Other languages
German (de)
English (en)
Inventor
Klaus Dr.Med. Draenert
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
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 Individual filed Critical Individual
Publication of EP0637231A1 publication Critical patent/EP0637231A1/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Withdrawn legal-status Critical Current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
    • A61F2/30942—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
    • 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
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
    • G05B19/4097—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by using design data to control NC machines, e.g. CAD/CAM
    • G05B19/4099—Surface or curve machining, making 3D objects, e.g. desktop manufacturing
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B34/00—Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
    • A61B34/10—Computer-aided planning, simulation or modelling of surgical operations
    • 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
    • A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
    • A61F2002/30004—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis
    • A61F2002/30014—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis differing in elasticity, stiffness or compressibility
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30108—Shapes
    • A61F2002/3011—Cross-sections or two-dimensional shapes
    • A61F2002/30112—Rounded shapes, e.g. with rounded corners
    • A61F2002/30131—Rounded shapes, e.g. with rounded corners horseshoe- or crescent- or C-shaped or U-shaped
    • 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
    • A61F2/30942—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
    • A61F2002/30952—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques using CAD-CAM techniques or NC-techniques
    • 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
    • A61F2/46—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
    • 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
    • A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0004—Rounded shapes, e.g. with rounded corners
    • A61F2230/0013—Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
    • A61F2250/0018—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in elasticity, stiffness or compressibility
    • 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
    • A61F2310/00017—Iron- or Fe-based alloys, e.g. stainless steel
    • 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
    • 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
    • A61F2310/00029—Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S623/00—Prosthesis, i.e. artificial body members, parts thereof, or aids and accessories therefor
    • Y10S623/901—Method of manufacturing prosthetic device
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S623/00—Prosthesis, i.e. artificial body members, parts thereof, or aids and accessories therefor
    • Y10S623/912—Method or apparatus for measuring or testing prosthetic
    • Y10S623/914—Bone

Definitions

  • the invention relates to a prosthesis component to be anchored without cement or with bone cement and to a method for its production.
  • the invention has for its object to provide a prosthesis component to be anchored with or without bone cement, which allows good long-term results to be expected during implantation.
  • the problem was investigated how the strength of the bone is related to the durability of an implantation. Histological studies were able to clearly demonstrate that the soft, deformable bones showed stable anchors only if implants with a low mass were used.
  • each bone has an individual shape and an individual strength; Both factors must therefore be taken into account when choosing the prosthesis.
  • a stable, compact bone is a good indication for metal-bone anchoring without the use of bone cement.
  • Two things are important here: 1. to achieve the greatest possible primary stability of the anchoring and 2. to provide the largest possible surface for the force transmission between the prosthesis and the bones.
  • the different compartments of the bone e.g. Epyphysis, metaphysis and diaphysis, have completely different shapes and strengths.
  • the invention showed that there is a good correlation between the density of a bone and its strength.
  • the density of the bone can therefore be used according to the invention as a measure of its strength.
  • ° i & prosthesis component is adjustable in its mass and / or stiffness to the individual properties of the bone.
  • the bending stiffness of the prosthesis is the decisive factor, for example in the medial, especially the edial-proximal area of the prosthesis.
  • tensile stresses occur in the distal as well as in the proximal area, so that the tensile strength of the prosthesis also plays a role there.
  • Tensile strength is particularly important in the distal area. Because of the muscle attachments that leave the femoral neck and femoral neck free, torsional forces also occur.
  • the desired material properties also vary in different areas of the prosthesis components.
  • the material properties discussed above are usually summarized in the present application as "stiffness".
  • the rigidity the prosthesis and / or its mass adapted to the individual properties of the bone are usually summarized in the present application as "stiffness".
  • the adaptation can be carried out in different ways, for example the material of the prosthesis can be selected according to the individual properties of the bone. In the case of a dense bone, a material with a higher specific mass and higher stiffness can be selected, whereas a material with a lower specific mass and stiffness is selected accordingly for a bone with low density.
  • CoCrMo alloys, Ti, Ti alloys, steel, plastic or composite materials, for example, can be used as prosthesis material.
  • the material for the prosthetic component inhomogeneous, in the sense that a material with a higher specific mass and / or stiffness is used in areas with higher bone density than in areas with lower bone density. It should be taken into account here that the bone density can vary greatly and e.g. in the spongy region of the femur, only 15 to 20% of the density of the compact bone can be.
  • the desired inhomogeneity of the material can be produced, for example, by varying the pore size when using a porous material and setting it smaller in the region of higher bone density.
  • Composite materials can also be used as material for the prosthesis component, the fiber content of the composite material, for example, being able to vary over the length of the prosthesis component. This allows the stiffness of the prosthesis component to be varied and adapted to the bone density.
  • the adaptation of the mass and / or stiffness of the prosthesis component to the individual properties of the bone can also be achieved by a suitable choice of the shape of the prosthesis component, in particular the cross section of the prosthesis component. nent in different bone sections. If, for example, the cross-section of a femoral prosthesis component is U-shaped or horseshoe-shaped at least over a substantial part of its length, as suggested in WO 90/02533, the cross-sectional area and thus the prosthesis mass can be selected in various sectional planes by suitable selection of the size and Depth of the gutter or slot between the two. Arms of the U-shaped cross section can be adjusted. A transition from a full shaft to a U-shaped cross section with very thin arms is conceivable. The largest possible surface for the power transmission is ensured by the fact that the prosthesis component forms a closed surface in the media, dorsomedial and anteromedial area.
  • Changes in mass and / or rigidity can also be achieved, for example, by making partially through bores, such as blind bores, or completely through bores in the prosthesis socket, in particular in order to reduce the mass and / or rigidity.
  • applied strips and / or reinforcements on the outer and / or inner contour of the prosthesis can increase the mass and / or the rigidity of the prosthesis component. This can be carried out either in sections or continuously over the entire length of the prosthesis component.
  • the adaptation of the mass and / or stiffness of the prosthesis component to the bone density is preferably carried out by providing a linear correlation between the bone density and the mass or stiffness of the prosthesis component, ie, for example in the case of a doubling pelung bone density component and the mass or stiffness of the prosthesis in the corresponding area of 'Prothesenkompo ⁇ is amplified percentage.
  • a linear correlation between the bone density and the mass or stiffness of the prosthesis component ie, for example in the case of a doubling pelung bone density component and the mass or stiffness of the prosthesis in the corresponding area of 'Prothesenkompo ⁇ is amplified percentage.
  • a patient with a deformed and arthrotically altered joint is examined in the computer tomograph, and stacked images of the joint are digitized and stored as cross-sectional images.
  • So-called binary images are generated from the cross-sectional images using image analysis methods, i.e. black and white contrast images that can be captured with their inner and outer contours.
  • the inner contour is put together in a 3-D model.
  • the axis or the axes of the joint is determined and displayed with the aid of the image analysis together with the contour model with the joint surfaces (see figure using the example of a femoral component).
  • the shaft shape of the prosthetic components can then be adapted to the shape of the bony bed.
  • the areal density of the bone is determined on the binary image in a plurality, preferably a total of six to ten sections, which are evenly distributed over the length of the bone, and is compared to a corresponding section of a correspondingly determined corresponding normal bone. This comparison gives a correlation factor as a measure of the strength of the individual bone. If the specific bone density corresponds to that of normal bone, the contour model of the bony bed is reduced by 20 to 50% for the cemented component, for the cementless component by 1 to 20%, preferably 5 to 10%, specifically, for example, eccentrically and / or concentric in order to fix the cross section of the prosthesis component in the relevant cutting plane.
  • the contour model is correspondingly reduced in size in order to determine the cross section of the prosthesis.
  • the values can be interpolated between the individual sectional planes.
  • One to be anchored with bone cement The prosthesis cross-section is preferably determined so that the layer thickness of the surrounding bone cement sheath is approximately inversely proportional to the bone density.
  • the data record of the contour model may be passed on to a CAD unit together with the rotation center or the joint axis.
  • the axis of the contour model is determined in the CAD unit and undercuts in the design are corrected, in such a way that the prosthesis component can be inserted in the bone cement in a straight line and / or with a slight screwing movement, if necessary, without bumping against the bone .
  • the construction obtained in this way is returned to the image analysis unit, where a double contour model with the outer and inner contour of the bone is generated, into which the prosthesis component can be fitted.
  • the magnification factor is finally the Pro 5 - synthesis component (posterior anterior-ray path) in the ap-Röntcrenscient and projected axial RöntÜjnsent and respectively inserted along its axis of implantation.
  • the mass and / or stiffness of the prosthesis is determined in proportion to the bone density.
  • the CAD data record is then completed with the standard construction data of the prosthesis and the implantation instruments and passed on to a milling unit.
  • the denture component is milled from a blank in the milling unit, for example in V 4 A steel. After processing the surface, the prosthesis component is washed and sterilized and is then ready for use.
  • the invention is explained in more detail below with reference to the accompanying figure.
  • the figure shows an embodiment of the prosthesis component according to the invention using the example of a cementless femoral prosthesis component, cross-sections of the prosthesis and the inner and outer contour model of the femur being drawn in at different sectional planes for a more detailed explanation.
  • the prosthesis is shown as a front view (in the implanted state).
  • the prosthesis shown schematically in the femur bone has an attachable spherical head 1, which is seated on the cone 2 of the prosthesis neck 3.
  • the rotation center is designated by the reference number 4.
  • the neck 3 is firmly connected to a shaft 5 of the prosthesis.
  • the optimal shaft cross sections 5 • resulting in the manner described above are shown.
  • eight shaft cross sections 5 1 are shown hatched and, in addition, three shaft cross sections are drawn out for clarification.
  • the bone density and the resulting optimum switching cross section are preferably determined in six to ten, for example nine, sectional planes.
  • Reference number 6 shows the outer contour model and reference number 7 the inner contour model of the femur as an example in the individual sectional planes, which each result from the image analysis.
  • the mass and / or rigidity of the prosthesis in the individual sectional planes can be adjusted by suitable design of the shaft cross sections 5 '. If, for example, a low mass is desired, the slot or the recess in the U-shaped cross-section of the shaft is correspondingly enlarged, the greatest possible surface being available for the force transmission between the prosthesis and bone in the medial region of the prosthesis. When changing the specific mass in a sectional plane, the stiffness of the prosthesis component generally also changes in this area.
  • the reference number 8 designates the construction axis of the prosthesis, which at the same time also represents the medullary cavity axis and the implantation axis.
  • Literature designates the construction axis of the prosthesis, which at the same time also represents the medullary cavity axis and the implantation axis.

Abstract

L'invention concerne des composants de prothèse à ancrer sans ciment ou bien avec du ciment osseux, ainsi que leur procédé de fabrication. Les composants de prothèse produits selon le procédé de la conception assistée par ordinateur et de l'analyse d'images présentent la plus grande surface possible permettant la transmission de forces et peuvent être adaptés aux propriétés individuelles des os, en raison de leur masse et de leur rigidité.
EP93909838A 1992-04-24 1993-04-26 Composants de prothese et leur procede de fabrication Withdrawn EP0637231A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE4213599 1992-04-24
DE4213598A DE4213598A1 (de) 1992-04-24 1992-04-24 Zementfreie Femurprothesenkomponente und Verfahren zu ihrer Herstellung
DE4213599A DE4213599A1 (de) 1992-04-24 1992-04-24 Prothesenkomponente und Verfahren zu ihrer Herstellung
DE4213597A DE4213597A1 (de) 1992-04-24 1992-04-24 Mit Knochenzement zu verankernde Femurprothesenkomponente und Verfahren zu ihrer Herstellung
PCT/EP1993/001002 WO1993021863A1 (fr) 1992-04-24 1993-04-26 Composants de prothese et leur procede de fabrication

Publications (1)

Publication Number Publication Date
EP0637231A1 true EP0637231A1 (fr) 1995-02-08

Family

ID=27203664

Family Applications (3)

Application Number Title Priority Date Filing Date
EP93909839A Withdrawn EP0637232A1 (fr) 1992-04-24 1993-04-26 Composant de prothese du femur depourvu de ciment et son procede de production
EP93909837A Withdrawn EP0637230A1 (fr) 1992-04-24 1993-04-26 Composants de protheses femorales a ancrer avec du ciment osseux et leur procede de fabrication
EP93909838A Withdrawn EP0637231A1 (fr) 1992-04-24 1993-04-26 Composants de prothese et leur procede de fabrication

Family Applications Before (2)

Application Number Title Priority Date Filing Date
EP93909839A Withdrawn EP0637232A1 (fr) 1992-04-24 1993-04-26 Composant de prothese du femur depourvu de ciment et son procede de production
EP93909837A Withdrawn EP0637230A1 (fr) 1992-04-24 1993-04-26 Composants de protheses femorales a ancrer avec du ciment osseux et leur procede de fabrication

Country Status (5)

Country Link
US (1) US5554190A (fr)
EP (3) EP0637232A1 (fr)
JP (3) JPH07508191A (fr)
DE (3) DE4213597A1 (fr)
WO (3) WO1993021862A1 (fr)

Families Citing this family (134)

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DE4213598A1 (de) 1993-10-28
DE4213599A1 (de) 1993-10-28
WO1993021864A1 (fr) 1993-11-11
DE4213597A1 (de) 1993-10-28
JPH07508190A (ja) 1995-09-14
EP0637232A1 (fr) 1995-02-08
WO1993021863A1 (fr) 1993-11-11
EP0637230A1 (fr) 1995-02-08
JPH07508191A (ja) 1995-09-14
JPH07508189A (ja) 1995-09-14
US5554190A (en) 1996-09-10
WO1993021862A1 (fr) 1993-11-11

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