WO2023115172A1 - Procédé de fabrication d'insert acétabulaire - Google Patents

Procédé de fabrication d'insert acétabulaire Download PDF

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Publication number
WO2023115172A1
WO2023115172A1 PCT/BR2021/050564 BR2021050564W WO2023115172A1 WO 2023115172 A1 WO2023115172 A1 WO 2023115172A1 BR 2021050564 W BR2021050564 W BR 2021050564W WO 2023115172 A1 WO2023115172 A1 WO 2023115172A1
Authority
WO
WIPO (PCT)
Prior art keywords
acetabular
cavity
insert
polishing
acetabular insert
Prior art date
Application number
PCT/BR2021/050564
Other languages
English (en)
Portuguese (pt)
Inventor
Daniel STAINER
Original Assignee
Stainer Daniel
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 Stainer Daniel filed Critical Stainer Daniel
Priority to PCT/BR2021/050564 priority Critical patent/WO2023115172A1/fr
Publication of WO2023115172A1 publication Critical patent/WO2023115172A1/fr

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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

Definitions

  • the present invention refers to a process that is used to manufacture an acetabular insert, which is a prosthesis that is intended for the reconstruction of the acetabulum, which is a concave depression formed in the iliac bone, and which is the place where the head of the femur bone fits together to form the articulation pair, also known as the tribological pair, which is the thigh bone. Since the proposed process results in an acetabular insert with superior quality of surface finish, and also results in superior quality of mechanical resistance against wear, among other advantages.
  • the acetabular inserts so far comprised in the state of the art are produced in ultra high molecular weight polyethylene (UHMW PE), which is supplied by specialized industries, in the form of cylindrical dowels, or else in the form of plates. So that, to obtain the acetabular inserts, the dowels or plates are cut to the necessary sizes, and submitted to the process of machining, where the artificial acetabular cavity is carved in the polyethylene piece by means of special machinery, such as high precision machines in the machining process, such as CNC tomes and CNC milling machines.
  • UHMW PE ultra high molecular weight polyethylene
  • the machining process involves some inconveniences and limitations; the most considerable of them being the fact that the machining of the artificial acetabular cavity results in a surface endowed with considerable micro-roughness, even though it is subjected to mechanical polishing processes, which impacts on the final quality of the prosthesis, as these micro-roughness result, over the course of time of use, in a process of wear between the surface of the cavity of the acetabular insert and the surface of the femoral head prosthesis, with the generation of loose polyethylene particles, also known as Debris, which contaminate the site, endangering the functionality of the prosthesis, and also the health of the patient.
  • loose polyethylene particles also known as Debris
  • a second drawback is the fact that the machining process of the acetabular insert requires a considerably large piece of polyethylene, so that the final piece can be extracted, which implies a great waste of material, which has a high cost and generation of non-recyclable material to the environment, therefore, impacts on the final price of the prosthesis, making it difficult for patients with lower purchasing value.
  • the present invention was developed. Being proposed a process for the manufacture of the acetabular insert, which comprises the injection/pressing of ultra high molecular weight polyethylene (UHMW PE) - in granular form - inside an injection mould/press mould. Since the element of the mold that shapes the acetabular cavity of the insert is made with a very high degree of polishing, obtaining a very low surface roughness in the product that was formed through the high compression force (in Kgf/cm2).
  • UHMW PE ultra high molecular weight polyethylene
  • FIGURE 1 represents an Acetabular Insert in central section
  • FIGURE 2 represents in perspective the part of the Mold that has the element for forming the polished surface of the acetabular insert cavity
  • FIGURE 3 represents in side view the part of the Mold that has the element for forming the polished surface of the acetabular insert cavity; and the FIGURE 4 represents in a top view the part of the Mold that has the element for forming the polished surface of the acetabular insert cavity.
  • MANUFACTURING PROCESS OF Acetabular Insert comprises the use of a special tooling, in high hardness steel, in the form of an injection mold (M) for thermoplastic , whose spherical element (E) that shapes the concave cavity (K) of the resulting acetabular insert (A), has its surface - convex - made with a very high degree of polishing.
  • This mold is driven by a hydraulic injection press, which injects the ultra high molecular weight polyethylene (UHMW PE) in powder form at high temperature - therefore in a state of fusion - and at high pressure, so that , the shaped part - acetabular insert (A) - presents the surface of the acetabular cavity (K) with a very high degree of polishing and free of imperfections, thus generating a finished surface ready to fulfill its final purpose and, therefore, without the need for from any further interference to suitability; only needing a little machining in its posterior portion, for adaptation to the receptacle (not illustrated) that makes the interface with the interior of the original acetabular cavity of the ilium bone.
  • UHMW PE ultra high molecular weight polyethylene
  • the present ACETABULAR INSERT MANUFACTURING PROCESS may present variations in its embodiment; a variety of equipment can be used, as well as a variety of materials, as long as the particular basic characteristics are maintained and which are essential to its realization, mainly the fact that the surface of the cavity (K) of the acetabular insert (A) results in a finished product after injection molding process.

Landscapes

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

Abstract

L'invention concerne un procédé utilisé pour la fabrication d'un insert acétabulaire, consistant en une prothèse destinée à la reconstruction de l'acétabulum, qui est une dépression concave formée dans l'os iliaque, et qui est l'emplacement où vient s'emboîter la tête du fémur. Le procédé proposé consiste à utiliser un moule (M) d'injection pour thermoplastique, dont l'élément sphérique (E) donnant forme à la cavité concave (K) de l'insert acétabulaire (A) résultant présente une surface réalisée avec un très haut degré de polissage. Ledit moule est actionné par une presse d'injection hydraulique, laquelle injecte le polyéthylène à ultra haut poids moléculaire (UHMW PE) sous forme de poudre à haute température - donc dans un état fondu - et à haute pression, de sorte que la pièce formée - insert acétabulaire (A) - résultante présente la surface de la cavité acétabulaire (L) avec un très haut degré de polissage et sans imperfections, ce qui permet d'obtenir une surface finie et prête pour remplir sa fonction finale.
PCT/BR2021/050564 2021-12-20 2021-12-20 Procédé de fabrication d'insert acétabulaire WO2023115172A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/BR2021/050564 WO2023115172A1 (fr) 2021-12-20 2021-12-20 Procédé de fabrication d'insert acétabulaire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/BR2021/050564 WO2023115172A1 (fr) 2021-12-20 2021-12-20 Procédé de fabrication d'insert acétabulaire

Publications (1)

Publication Number Publication Date
WO2023115172A1 true WO2023115172A1 (fr) 2023-06-29

Family

ID=86900870

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BR2021/050564 WO2023115172A1 (fr) 2021-12-20 2021-12-20 Procédé de fabrication d'insert acétabulaire

Country Status (1)

Country Link
WO (1) WO2023115172A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050146070A1 (en) * 2002-06-21 2005-07-07 Massachusetts General Hospital Meta lback or mesh crosslinking
US20060198943A1 (en) * 2005-03-03 2006-09-07 Biomet Manufacturing Corp. Acetabular shell system and method for making
US20160220376A1 (en) * 2010-10-08 2016-08-04 Yadong Li Artificial acetabulum with multi-layer shell core composite structure
US9718241B2 (en) * 2008-01-30 2017-08-01 Zimmer, Inc. Method of manufacturing an acetabular component

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050146070A1 (en) * 2002-06-21 2005-07-07 Massachusetts General Hospital Meta lback or mesh crosslinking
US20060198943A1 (en) * 2005-03-03 2006-09-07 Biomet Manufacturing Corp. Acetabular shell system and method for making
US9718241B2 (en) * 2008-01-30 2017-08-01 Zimmer, Inc. Method of manufacturing an acetabular component
US20160220376A1 (en) * 2010-10-08 2016-08-04 Yadong Li Artificial acetabulum with multi-layer shell core composite structure

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