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

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 temp...

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Bibliographische Detailangaben
Hauptverfasser:	LAZENNEC JEAN YVES, DAMBREVILLE ALAIN, GACON GERARD, LAURENCON MICHEL, LALAIN JEAN JACQUES, BARBA LAURENT, SCHMITT DANIEL, KEHR PIERRE, HUMMER JACQUES, LAVILLE CLAUDE
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING BANDAGES, DRESSINGS OR ABSORBENT PADS DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF,TUBULAR STRUCTURES OF THE BODY, E.G. STENTS FILTERS IMPLANTABLE INTO BLOOD VESSELS FIRST-AID KITS FOMENTATION HUMAN NECESSITIES HYGIENE INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS MEDICAL OR VETERINARY SCIENCE ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES PERFORMING OPERATIONS PROSTHESES SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TRANSPORTING TREATMENT OR PROTECTION OF EYES OR EARS WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	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. Cet implant comprend une pièce en polyéthylène (3) et une cupule (2) en métal ou en céramique.Selon l'invention, ce procédé comprend les opérations consistant à :- aménager des évidements (5) dans la paroi de la cupule (2), à partir de la face extérieure de celle-ci;- réaliser la réticulation du polyéthylène constituant ladite pièce (3);- chauffer cette pièce (3) jusqu'à une température de malléabilité du polyéthylène, c'est-à-dire sensiblement 130degre;- engager la cupule (2) dans la cavité (6) de cette pièce (3);- 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- permettre le refroidissement de la pièce (3) tout en maintenant ce serrage ou cours de ce refroidissement.