FR2784290A1 - Making prosthetic hip joint comprises forming meridian grooves into outer surface of e.g. ceramic cup, followed by clamping and keying radiation-cross-linked, hot, oxygen-saturated polyethylene molding to it - Google Patents

Making prosthetic hip joint comprises forming meridian grooves into outer surface of e.g. ceramic cup, followed by clamping and keying radiation-cross-linked, hot, oxygen-saturated polyethylene molding to it Download PDF

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Publication number
FR2784290A1
FR2784290A1 FR9812712A FR9812712A FR2784290A1 FR 2784290 A1 FR2784290 A1 FR 2784290A1 FR 9812712 A FR9812712 A FR 9812712A FR 9812712 A FR9812712 A FR 9812712A FR 2784290 A1 FR2784290 A1 FR 2784290A1
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France
Prior art keywords
cup
polyethylene
cavity
oxygen
face
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
FR9812712A
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French (fr)
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FR2784290B1 (en
Inventor
Pierre Kehr
Jean Yves Lazennec
Daniel Schmitt
Laurent Barba
Alain Dambreville
Gerard Gacon
Jacques Hummer
Jean Jacques Lalain
Michel Laurencon
Claude Laville
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Individual
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Individual
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Priority to FR9812712A priority Critical patent/FR2784290B1/en
Publication of FR2784290A1 publication Critical patent/FR2784290A1/en
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Publication of FR2784290B1 publication Critical patent/FR2784290B1/en
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Expired - Fee Related legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/32—Joints for the hip
    • A61F2/34—Acetabular cups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0078—Measures or configurations for obtaining anchoring effects in the contact areas between layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • B29C65/64—Joining a non-plastics element to a plastics element, e.g. by force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • B29C66/545—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles one hollow-preform being placed inside the other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/74—Joining plastics material to non-plastics material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • 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
    • 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
    • A61F2002/3006—Properties of materials and coating materials
    • A61F2002/30065—Properties of materials and coating materials thermoplastic, i.e. softening or fusing when heated, and hardening and becoming rigid again when cooled
    • 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
    • A61F2002/30383—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by laterally inserting a protrusion, e.g. a rib into a complementarily-shaped groove
    • A61F2002/30403—Longitudinally-oriented cooperating ribs and grooves on mating lateral surfaces of a mainly longitudinal connection
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/3082—Grooves
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/3094—Designing or manufacturing processes
    • A61F2002/30971—Laminates, i.e. layered products
    • A61F2002/30973—Two joined adjacent layers having complementary interlocking protrusions and recesses
    • 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
    • A61F2002/3429—Acetabular cups with an integral peripheral collar or flange, e.g. oriented away from the shell centre line
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • 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
    • A61F2002/3429—Acetabular cups with an integral peripheral collar or flange, e.g. oriented away from the shell centre line
    • A61F2002/3437—Acetabular cups with an integral peripheral collar or flange, e.g. oriented away from the shell centre line oriented inwardly towards the shell centre line
    • 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
    • A61F2002/3445—Acetabular cups having a number of shells different from two
    • 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
    • A61F2210/00—Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2210/0071—Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof thermoplastic
    • 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
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00011—Metals or alloys
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
    • A61F2310/00005—The prosthesis being constructed from a particular material
    • A61F2310/00179—Ceramics or ceramic-like structures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/085—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using gamma-ray
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/74—Joining plastics material to non-plastics material
    • B29C66/742—Joining plastics material to non-plastics material to metals or their alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/74—Joining plastics material to non-plastics material
    • B29C66/746—Joining plastics material to non-plastics material to inorganic materials not provided for in groups B29C66/742 - B29C66/744
    • B29C66/7461—Ceramics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
    • B29K2705/08—Transition metals
    • B29K2705/12—Iron
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/753—Medical equipment; Accessories therefor
    • B29L2031/7532—Artificial members, protheses

Abstract

Starting at the external face (2a), recesses (5) are formed into the outer cup wall. Polyethylene forming the molding (3) is cross-linked and heated to softening temperature of 130 deg C. The cup (2) is engaged into its cavity. The outer molding is then clamped radially inwards, whilst still at temperature. Polyethylene flows into the recesses (5) of cup. The assembly is cooled, maintaining clamping. Preferred features: Additional operations include subjecting the molding to hard vacuum long enough to desorb oxygen contained in the polyethylene, e.g. for 48 h. Once irradiation is complete, the molding is placed in an atmosphere of pure oxygen, to saturate it with oxygen. The recesses are notches with rounded bases, distributed equally around the circumference of the cup, orientated towards its meridian lines. A flange (8) covers part of the cup face (2a), delimiting the cavity opening. The flange prevents any direct contact between the neck of the femoral shaft and the cup. The flange has a circular internal face of conic form, angled at 100 deg -120 deg . The face is formed with a cylindrical portion in the side of the cavity opening.

Description

La présente invention concerne un procédé de fabrication d'un implant cotyloïdien de prothèse de hanche. The present invention relates to a method of manufacturing a cotyloid implant for a hip prosthesis.

Un tel implant comprend généralement une coque de forme plus ou moins hémisphérique et une pièce en polyéthylène destinée à tre engagée et retenue dans la coque. La coque est destinée à tre placée dans la cavité cotyloïdienne de l'articulation à appareiller, et la pièce en polyéthylène est destinée à recevoir avec possibilité d'articulation, dans une cavité qu'elle délimite, la tte sphérique d'une tige médullaire implantée sur l'extrémité supérieure du fémur. Such an implant generally comprises a shell of more or less hemispherical shape and a polyethylene piece intended to be engaged and retained in the shell. The shell is intended to be placed in the acetabular cavity of the joint to be fitted, and the polyethylene piece is intended to receive with possibility of articulation, in a cavity which it delimits, the spherical head of an implanted medullary rod. on the upper end of the femur.

Une telle pièce en polyéthylène permet, par la relative souplesse de son matériau constitutif, de donner des propriétés d'amortissement à l'articulation prothétique. Elle présente toutefois les inconvénients de s'user et de fluer à la longue sous l'effet des contraintes répétées subies par l'articulation. L'usure résulte essentiellement des micro-mouvements de la pièce par rapport à la coque. Elle conduit à une prise de jeu de ta tte fémorale dans ladite pièce, qui sollicite de manière néfaste l'ancrage de la coque et peut conduire à une désolidarisation de celle-ci. Le fluage résulte quant à lui du jeu pouvant exister entre la coque et la pièce en polyéthylène. Such a polyethylene piece allows, by the relative flexibility of its constituent material, to give damping properties to the prosthetic joint. However, it has the drawbacks of wearing out and creeping in the long run under the effect of the repeated stresses undergone by the joint. The wear results mainly from micro-movements of the part relative to the shell. It leads to a clearance of your femoral head in said part, which adversely requests the anchoring of the shell and can lead to a separation of the latter. Creep results from the play that may exist between the shell and the polyethylene part.

Pour remédier à ces problèmes d'usure et de fluage, il a été conçu d'équiper une pièce en polyéthylène d'une cupule en métal ou en céramique, cette cupule délimitant elle-mme la cavité d'articulation. To remedy these wear and creep problems, it has been designed to equip a polyethylene part with a metal or ceramic cup, this cup itself delimiting the articulation cavity.

II apparaît toutefois que les problèmes de micro-mouvements de la cupule par rapport à la pièce en polyéthylène ou de jeu résiduel entre cette pièce et la cupule n'ont pas été solutionnés à ce jour de manière satisfaisante, de sorte qu'il existe toujours un risque d'usure et de fluage de cette pièce. However, it appears that the problems of micro-movements of the cup relative to the polyethylene part or of residual play between this part and the cup have not been satisfactorily resolved to date, so that there still exists a risk of wear and creep of this part.

La présente invention a pour but de remédier à ce problème essentiel. The object of the present invention is to remedy this essential problem.

A cet effet, le procédé qu'elle concerne comprend les opérations consistant à :
-aménager des évidements dans la paroi de la cupule, à partir de la face extérieure de cele-ci ;
-réaliser la réticulation du polyéthylène constituant ladite pièce ;
-chauffer cette pièce jusqu'à une température de malléabilité du polyéthylène, c'est-à-dire sensiblement 130 ;
-engager la cupule dans la cavité de cette pièce ;
-exercer sur ladite pièce, alors que celle-ci est toujours à la température précitée, un serrage radial vers l'intérieur, de manière à provoquer un fluage du polyéthylène dans les évidements de la cupule, et
-permettre le refroidissement de la pièce de polyéthylène tout en maintenant ce serrage ou cours de ce refroidissement.To this end, the process which it concerns comprises the operations consisting in:
- arrange recesses in the wall of the cup, from the outer face thereof;
performing the crosslinking of the polyethylene constituting said part;
-heating this part up to a malleability temperature of the polyethylene, that is to say substantially 130;
-engage the cup in the cavity of this part;
-exercise on said part, while the latter is still at the aforementioned temperature, a radial tightening inwards, so as to cause a creep of the polyethylene in the recesses of the cup, and
-allow cooling of the polyethylene piece while maintaining this tightening or during this cooling.

La réticulation du polyéthylène permet d'accroître) la température à laquelle ce polyéthylène devient malléable ; le surcroît d'échauffement nécessaire à l'obtention de cette malléabilité permet d'obtenir un surcroît de dilatation du polyéthylène, dû à cet échauffement. The crosslinking of the polyethylene makes it possible to increase) the temperature at which this polyethylene becomes malleable; the additional heating necessary to obtain this malleability makes it possible to obtain an additional expansion of the polyethylene, due to this heating.

Ce surcroît de dilatation a pour effet, après refroidissement, d'augmenter corrélativement la contrainte de frettage exercée par la pièce en polyéthylène sur la cupule et assure par conséquent une parfaite liaison de cette pièce avec cette cupule.This additional expansion has the effect, after cooling, of correlatively increasing the shrinking stress exerted by the polyethylene piece on the cup and consequently ensures a perfect connection of this piece with this cup.

La réticulation permet en outre de"figer"les contraintes provoquées dans le polyéthylène par le serrage et de réduire notablement la capacité de déformation de ce polyéthylène par fluage. Crosslinking also makes it possible to "freeze" the stresses caused in the polyethylene by tightening and to significantly reduce the deformation capacity of this polyethylene by creep.

Le fluage du polyéthylène autour de la cupule et dans les évidements de celle-ci permet d'obtenir de larges surfaces de contact et d'appui entre ces deux pièces ainsi qu'une parfaite complémentarité de forme entre elles. The creep of the polyethylene around the cup and in the recesses thereof makes it possible to obtain large contact and support surfaces between these two parts as well as a perfect complementarity of shape between them.

L'implant obtenu par le procédé selon l'invention présente ainsi une parfaite cohésion de la pièce en polyéthylène et de la cupule, qui élimine les risques d'usure ou de fluage du polyéthylène tout en conservant des propriétés d'amortissement à l'articulation prothétique grâce à la pièce en polyéthylène. The implant obtained by the method according to the invention thus has perfect cohesion of the polyethylene part and of the cup, which eliminates the risks of wear or creep of the polyethylene while retaining damping properties at the joint. prosthetic thanks to the polyethylene piece.

La réticulation du polyéthylène est de préférence réalisée par irradiation à partir d'une source radio-active appropriée, notamment par une irradiation au cobalt entre 35 et 100 kilo-grays. The crosslinking of the polyethylene is preferably carried out by irradiation from an appropriate radioactive source, in particular by irradiation with cobalt between 35 and 100 kilo-grays.

Avantageusement, le procédé comprend en outre les opérations consistant,
-avant l'irradiation, à mettre ladite pièce sous un vide poussé pendant une durée suffisante pour la désorption de l'oxygène contenu dans le polyéthylène, à savoir une durée de 48 heures ;
-une fois l'irradiation réalisée, à mettre ladite pièce dans une atmosphère saturée en oxygène pour permettre la saturation du polyéthylène en oxygène.Advantageously, the method further comprises the operations consisting,
before irradiation, putting said part under a high vacuum for a period sufficient for the desorption of the oxygen contained in the polyethylene, namely a period of 48 hours;
- once the irradiation has been carried out, putting said part in an atmosphere saturated with oxygen to allow the saturation of the polyethylene with oxygen.

La mise sous vide de la pièce permet d'éliminer l'oxygène absorbé naturellement par le polyéthylène et donc d'éliminer tout risque de réactions chimiques ou de modifications physico-chimiques néfastes susceptibles d'tre générées par l'irradiation. The vacuuming of the part makes it possible to eliminate the oxygen absorbed naturally by the polyethylene and therefore to eliminate any risk of chemical reactions or harmful physicochemical modifications likely to be generated by the irradiation.

Le procédé comprend avantageusement l'opération consistant à aménager lesdits évidements sous forme d'encoches à fonds arrondis, disposées de manière équidistantes sur le pourtour de la cupule et orientées selon des méridiens de celle-ci. The method advantageously comprises the operation consisting in arranging said recesses in the form of notches with rounded bottoms, arranged equidistantly around the periphery of the cup and oriented along meridians thereof.

Les évidements ainsi conformés favorisent le fluage du polyéthylène et permettent une parfaite liaison anti-rotation de la cupule par rapport à la pièce en polyéthylène. The recesses thus formed promote the creep of the polyethylene and allow a perfect anti-rotation connection of the cup relative to the polyethylene part.

Le procédé comprend également avantageusement l'opération consistant à aménager une collerette de recouvrement au moins partiel de la face de la cupule délimitant l'ouverture de la cavité de cette cupule, cette collerette étant conformée pour empcher tout contact direct du col de la tige fémorale avec la cupule. The method also advantageously comprises the operation consisting in arranging an at least partial covering flange of the face of the cup delimiting the opening of the cavity of this cup, this flange being shaped to prevent any direct contact with the neck of the femoral stem. with the cup.

Cette collerette est avantageusement aménagée de manière à présenter une face circulaire intérieure de forme conique, dont la pente est de l'ordre de 100 à 120 . This collar is advantageously arranged so as to have an inner circular face of conical shape, the slope of which is of the order of 100 to 120.

Cette face permet de guider de manière fiable la tte fémorale dans la cavité de la cupule en cas de légère luxation de l'articulation prothétique. This face makes it possible to guide the femoral head reliably in the cavity of the cup in the event of slight dislocation of the prosthetic joint.

En outre, la face de ladite pièce qui délimite la cavité destinée à recevoir la cupule peut tre réalisée avec une portion cylindrique du côté de l'ouverture de cette cavité. In addition, the face of said part which delimits the cavity intended to receive the cup can be made with a cylindrical portion on the side of the opening of this cavity.

L'épaisseur accrue de la pièce résultant de cette portion cylindrique permet de réaliser le fluage précité du polyéthylène de manière optimale. The increased thickness of the part resulting from this cylindrical portion makes it possible to achieve the above-mentioned creep of the polyethylene in an optimal manner.

Pour sa bonne compréhension, l'invention est à nouveau décrite ci-dessous en référence au dessin schématique annexé représentant, à titre d'exemple non limitatif, un implant cotyloïdien de prothèse de hanche obtenu par le procédé de fabrication qu'elle concerne.  For a good understanding, the invention is again described below with reference to the appended diagrammatic drawing representing, by way of nonlimiting example, an acetabular hip prosthesis implant obtained by the manufacturing process which it relates to.

La figure 1 est une vue en perspective de deux pièces destinées à tre assemblées pour constituer un sous-ensemble de cet implant ;
la figure 2 est une vue de face de ce sous-ensemble placé dans un outil de serrage, et
la figure 3 est une vue en coupe dudit sous-ensemble après assemblage.FIG. 1 is a perspective view of two parts intended to be assembled to constitute a sub-assembly of this implant;
FIG. 2 is a front view of this sub-assembly placed in a clamping tool, and
Figure 3 is a sectional view of said sub-assembly after assembly.

La figure 3 représente l'insert 1 d'un implant cotyloïdien de prothèse de hanche. Cet insert 1 est destiné, selon une technique classique, à tre engagé et retenu dans la cavité d'une coque (non représentée) de forme générale plus ou moins hémisphérique, cette coque étant destinée à tre placée dans la cavité cotyloïdienne de l'articulation à appareiller. FIG. 3 represents the insert 1 of an acetabular implant of hip prosthesis. This insert 1 is intended, according to a conventional technique, to be engaged and retained in the cavity of a shell (not shown) of more or less hemispherical general shape, this shell being intended to be placed in the acetabular cavity of the joint to be fitted.

L'insert 1 est constitué par une cupule 2 en métal ou en céramique et par une pièce 3 en polyéthylène réticulé. The insert 1 is constituted by a cup 2 made of metal or ceramic and by a piece 3 of crosslinked polyethylene.

Comme le montrent les figures, la cupule 2 présente une forme générale hémisphérique et délimite une cavité hémisphérique 4. Cette cavité 4 est destinée à recevoir, avec possibilité d'articulation, la tte sphérique d'une tige médullaire implantée sur l'extrémité supérieure du fémur. As the figures show, the cup 2 has a general hemispherical shape and delimits a hemispherical cavity 4. This cavity 4 is intended to receive, with possibility of articulation, the spherical head of a medullary rod implanted on the upper end of the femur.

Cette cupule 2 comprend trois encoches 5 à fonds arrondis, aménagées à partir de sa face extérieure, de manière équidistante sur son pourtour. Ces encoches sont aménagées selon des méridiens de la cupule 2 et débouchent dans la face 2a de celle-ci qui délimite l'ouverture de la cavité 4. This cup 2 comprises three notches 5 with rounded bottoms, arranged from its outer face, equidistantly around its periphery. These notches are arranged along meridians of the cup 2 and open into the face 2a thereof which delimits the opening of the cavity 4.

La pièce 3 délimite une cavité 6 sensiblement hémisphérique pour recevoir la cupule 2 et comprend trois saillies 7 de son matériau constitutif, engagées dans les trois encoches 5. The part 3 defines a substantially hemispherical cavity 6 for receiving the cup 2 and comprises three protrusions 7 of its constituent material, engaged in the three notches 5.

La pièce 3 présente de plus une collerette 8 de recouvrement partiel de la face 2a. Cette collerette 8 est conformée pour empcher tout contact direct du col de la tige fémorale de la prothèse avec la cupule 2 et présente une face circulaire intérieure 8a de forme conique, dont la pente est de l'ordre de 110 . 3Cette face 8a permet de guider de manière fiable la tte fémorale dans la cavité 4 en cas de légère luxation de l'articulation prothétique.  The part 3 also has a collar 8 for partially covering the face 2a. This flange 8 is shaped to prevent any direct contact of the neck of the femoral stem of the prosthesis with the cup 2 and has an inner circular face 8a of conical shape, the slope of which is of the order of 110. 3This face 8a makes it possible to reliably guide the femoral head in the cavity 4 in the event of slight dislocation of the prosthetic joint.

En outre, la pièce 3 comprend une face extérieure lisse et un rebord 9 en saillie vers l'extérieur pour sa prise d'appui contre la coque métallique. In addition, the part 3 comprises a smooth outer face and a rim 9 projecting outwardly for its support against the metal shell.

Le procédé de fabrication de l'insert 1 comprend les opérations consistant à :
-mettre la pièce 3 sous un vide poussé pendant une durée suffisante pour la désorption de l'oxygène contenu dans le polyéthylène, à savoir une durée de 48 heures ;
-réaliser la réticulation du polyéthylène par une irradiation au cobalt entre 35 et 100 kilo-grays ;
-mettre la pièce 3 dans une atmosphère saturée en oxygène pour permettre la saturation du polyéthylène en oxygène ;
-chauffer cette pièce 3 jusqu'à une température de malléabilité du polyéthylène, c'est-à-dire sensiblement 130 ;
-engager la cupule 2 dans la cavité ;
-placer l'ensemble dans un outil de serrage radial de la pièce 3 contre la cupule 2, cet outil comprenant, ainsi que le montre la figure 2, quatre mors 10 dont chacun présente une face de serrage en quart d'hémisphère ;
-exercer sur ladite pièce 3, alors que celle-ci est toujours à la température précitée, un serrage radial vers l'intérieur, de manière à provoquer un fluage du polyéthylène dans les encoches 5, pour constituer les saillies 7 ;
-aménager la collerette 8 par moulage réalisé au moyen d'un serrage à l'aide d'un autre outil, et
-permettre le refroidissement de la pièce 3 tout en maintenant ce serrage ou cours de ce refroidissement.The process for manufacturing the insert 1 comprises the operations consisting in:
put the part 3 under a high vacuum for a period sufficient for the desorption of the oxygen contained in the polyethylene, namely a period of 48 hours;
-realize the crosslinking of the polyethylene by irradiation with cobalt between 35 and 100 kilo-grays;
put the part 3 in an atmosphere saturated with oxygen to allow the saturation of the polyethylene with oxygen;
-heating this part 3 to a malleability temperature of the polyethylene, that is to say substantially 130;
-engage the cup 2 in the cavity;
place the assembly in a radial clamping tool of the part 3 against the cup 2, this tool comprising, as shown in FIG. 2, four jaws 10 each of which has a clamping face in quarter of a hemisphere;
-exercise on said part 3, while the latter is still at the aforementioned temperature, a radial tightening inwards, so as to cause a creep of the polyethylene in the notches 5, to constitute the projections 7;
fitting out the flange 8 by molding produced by clamping using another tool, and
-allow the cooling of part 3 while maintaining this tightening or during this cooling.

L'implant obtenu par le procédé selon l'invention présente ainsi une parfaite cohésion de la pièce 3 et de la cupule 2, qui élimine les risques d'usure ou de fluage du polyéthylène tout en conservant des propriétés d'amortissement à l'articulation prothétique grâce à la pièce 3. The implant obtained by the method according to the invention thus has perfect cohesion of the part 3 and the cup 2, which eliminates the risks of wear or creep of the polyethylene while retaining damping properties at the joint. prosthetic thanks to part 3.

II va de soi que l'invention n'est pas limitée à la forme de réalisation décrite ci-dessus à titre d'exemple mais qu'elle en embrasse, au contraire, toutes les variantes de réalisation. Ainsi, la pièce 3 peut tre prévue pour tre fixée directement à l'os par ciment, et comprend alors une face extérieure conformée de manière appropriée, notamment pourvue de rainures pour le fluage du ciment.  It goes without saying that the invention is not limited to the embodiment described above by way of example but that it embraces, on the contrary, all the variant embodiments. Thus, the part 3 can be designed to be fixed directly to the bone by cement, and then comprises an outer face suitably shaped, in particular provided with grooves for the creep of the cement.

Claims (8)

REVENDICATIONS 1-Procédé de fabrication d'un implant cotyloïdien de prothèse de hanche, cet implant comprenant une pièce en polyéthylène (3) qui délimite une cavité (6) et une cupule (2) en métal ou en céramique insérée dans cette cavité (6), cette cupule (2) délimitant elle-mme la cavité (4) d'articulation prothétique, procédé caractérisé en ce qu'il comprend les opérations consistant à : 1-Process for manufacturing a cotyloid implant for a hip prosthesis, this implant comprising a polyethylene piece (3) which delimits a cavity (6) and a metal or ceramic cup (2) inserted in this cavity (6) , this cup (2) delimiting itself the cavity (4) of prosthetic articulation, process characterized in that it comprises the operations consisting in: -aménager des évidements (5) dans la paroi de la cupule (2), à partir de la face extérieure de celle-ci ; -arrange recesses (5) in the wall of the cup (2), from the outer face thereof; -réaliser la réticulation du polyéthylène constituant ladite pièce (3) ; performing the crosslinking of the polyethylene constituting said part (3); -chauffer cette pièce (3) jusqu'à une température de malléabilité du polyéthylène, c'est-à-dire sensiblement 130 ; -heating this part (3) to a malleability temperature of the polyethylene, that is to say substantially 130; -engager la cupule (2) dans la cavité (6) de cette pièce ;  -engage the cup (2) in the cavity (6) of this part; -exercer sur ladite pièce (3), alors que celle-ci est toujours à la température précitée, un serrage radial vers l'intérieur, de manière à provoquer un fluage du polyéthylène dans les évidements (5) de la cupule (2), et -exercise on said part (3), while the latter is still at the aforementioned temperature, a radial tightening inwards, so as to cause a creep of the polyethylene in the recesses (5) of the cup (2), and -permettre le refroidissement de la pièce (3) tout en maintenant ce serrage ou cours de ce refroidissement. -allow the cooling of the part (3) while maintaining this tightening or during this cooling. 2-Procédé selon la revendication 1, caractérisé en ce que la réticulation du polyéthylène est réalisée par irradiation à partir d'une source radio-active appropriée. 2-A method according to claim 1, characterized in that the crosslinking of the polyethylene is carried out by irradiation from an appropriate radioactive source. 3-Procédé selon la revendication 2, caractérisé en ce que la réticulation du polyéthylène est réalisée par une irradiation au cobalt entre 35 et 100 kilo-grays. 3-A method according to claim 2, characterized in that the crosslinking of the polyethylene is carried out by irradiation with cobalt between 35 and 100 kilo-grays. 4-Procédé selon la revendication 2 ou la revendication 3, caractérisé en ce qu'il comprend en outre les opérations consistant, 4-A method according to claim 2 or claim 3, characterized in that it further comprises the operations consisting, -avant l'irradiation, à mettre ladite pièce (3) sous un vide poussé pendant une durée suffisante pour la désorption de l'oxygène contenu dans le polyéthylène, à savoir une durée de 48 heures ; before irradiation, putting said part (3) under a high vacuum for a period sufficient for the desorption of the oxygen contained in the polyethylene, namely a period of 48 hours; -une fois l'irradiation réalisée, à mettre ladite pièce (3) dans une atmosphère saturée en oxygène pour permettre la saturation du polyéthylène en oxygène. - once the irradiation has been carried out, putting said part (3) in an atmosphere saturated with oxygen to allow saturation of the polyethylene with oxygen. 5-Procédé selon l'une des revendications 1 à 4, caractérisé en ce qu'il comprend en outre l'opération consistant à aménager lesdits évidements (5) sous forme d'encoches à fonds arrondis, disposées de manière équidistantes sur le pourtour de la cupule (2) et orientées selon des méridiens de celle-ci. 5-A method according to one of claims 1 to 4, characterized in that it further comprises the operation of arranging said recesses (5) in the form of notches with rounded bottoms, arranged equidistantly around the periphery of the cup (2) and oriented along meridians thereof. 6-Procédé selon l'une des revendications 1 à 5, caractérisé en ce qu'il comprend en outre l'opération consistant à aménager une collerette (8) de recouvrement au moins partiel de la face (2a) de la cupule (2) délimitant l'ouverture de la cavité (4) de cette cupule (2), cette collerette (8) étant conformée pour empcher tout contact direct du col de la tige fémorale avec la cupule (2). 6-A method according to one of claims 1 to 5, characterized in that it further comprises the operation of providing a flange (8) at least partially covering the face (2a) of the cup (2) delimiting the opening of the cavity (4) of this cup (2), this collar (8) being shaped to prevent any direct contact of the neck of the femoral stem with the cup (2). 7-Procédé selon la revendication 6, caractérisé en ce que cette collerette (8) est aménagée de manière à présenter une face circulaire intérieure (8a) de forme conique, dont la pente est de l'ordre de 100 b 1200.  7-A method according to claim 6, characterized in that this collar (8) is arranged so as to have an inner circular face (8a) of conical shape, whose slope is of the order of 100 b 1200. 8-Procédé selon l'une des revendications 1 à 6, caractérisé en ce qu'il comprend en outre l'opération consistant à réaliser la face de ladite pièce qui délimite la cavité destinée à recevoir la cupule avec une portion cylindrique du côté de l'ouverture de cette cavité.  8-A method according to one of claims 1 to 6, characterized in that it further comprises the operation of performing the face of said piece which delimits the cavity intended to receive the cup with a cylindrical portion on the side of the opening of this cavity.
FR9812712A 1998-10-07 1998-10-07 METHOD FOR MANUFACTURING A COTYLOIDAL HIP PROSTHESIS IMPLANT Expired - Fee Related FR2784290B1 (en)

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