INTEGRATED PROSTHETIC ELEMENT

• US 20130006354A1
• Filed: 02/25/2011
• Published: 01/03/2013
• Est. Priority Date: 02/26/2010
• Status: Active Grant

• Current Assignee: Limacorporate S.p.a (Enovis Corp.)
• Original Assignee: Limacorporate S.p.a (Enovis Corp.)
• Inventors: Pressacco, Michele
• Granted Patent: US 8,864,826 B2
• Time in Patent Office: Days
• US Class Current: 623/11.11
• CPC Class Codes: A61F 2/30 Joints
• CPC Class Codes: A61F 2/3094 Designing or manufacturing processes
• CPC Class Codes: A61F 2002/30065 thermoplastic, i.e. softening or fusing when heated, and hardening and becoming rigid again when cooled
• CPC Class Codes: A61F 2002/30772 Apertures or holes, e.g. of circular cross section
• CPC Class Codes: A61F 2002/3092 having an open-celled or open-pored structure
• CPC Class Codes: A61F 2002/30971 Laminates, i.e. layered products
• CPC Class Codes: A61F 2002/30985 using three dimensional printing [3DP]
• CPC Class Codes: A61F 2210/0071 thermoplastic
• CPC Class Codes: A61F 2310/00023 Titanium or titanium-based alloys, e.g. Ti-Ni alloys
• CPC Class Codes: A61F 2310/00029 Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
• CPC Class Codes: A61F 2310/00131 Tantalum or Ta-based alloys
• CPC Class Codes: B33Y 80/00 Products made by additive manufacturing

Abstract

Integrated prosthetic element usable for bone implant operations or as a bone filler or replacement, comprising at least a metal support and an insert made of plastic material coupled with at least a first surface of said metal support so as to define a wear surface, or insert, of adjustable thickness. The metal support comprises, on the side opposite said first surface, a second surface intended to be coupled with the bone part on which the prosthesis or bone replacement is installed. The first surface comprises a layer having cavities or holes distributed in a substantially uniform manner and suitable for anchorage and solidarization of the plastic material that makes up the insert, while said second surface comprises a porous layer suitable to optimize the bone anchorage. The first surface and the second surface are separated by a compact layer that stops the plastic material in the step of forming the plastic insert. The cavities or holes of the first surface have bigger shapes and sizes than, and in any case different from, the pores of the second surface.

Claims

1. Integrated prosthetic element usable for bone implant operations as a femoral, shoulder or knee prosthesis, or as a bone filler or replacement, insert or shell, comprising at least a metal support and an insert made of plastic material coupled with at least a first surface of said metal support so as to define a wear surface, or insert, of adjustable thickness, open towards a mobile part of a prosthesis, said metal support comprising, on a side opposite said first surface, a second surface intended to be coupled with the bone part on which the prosthesis or bone replacement is installed, wherein said first surface comprises a solidarization layer, having cavities or holes which extend internally said first surface and are distributed in a substantially uniform manner and suitable for anchorage and solidarization of the plastic material that makes up the insert, while said second surface comprises a porous layer suitable to optimize the bone anchorage, wherein said first surface and said second surface are separated by a compact layer that stops the liquid or semi-liquid plastic material in the step of forming the plastic insert, and wherein the cavities or holes of the first surface have bigger shapes and sizes than, and in any case different from, the pores of the second surface, and wherein the metal support, with the solidarization layer, the compact layer and the porous layer are all obtained using either the Electron Beam Melting Technique (EBM), or a technique using a high power laser ray, from a powder material based on pure titanium, or an alloy thereof, or cobalt alloys, tantalum alloys or other suitable biocompatible alloy.

2. Prosthetic element as in claim 1, wherein the plastic insert is at least partly obtained by feeding plastic material in its liquid or semi-liquid state into said cavities or holes of the solidarization layer made in the first surface.

3. Prosthetic element as in claim 1, wherein said cavities or holes extend toward the inside of the solidarization layer and create at least undercuts, or have a series of open cavities intercommunicating and connected with each other.

4. Prosthetic element as in claim 1, wherein said metal support is made of titanium and/or cobalt and/or tantalum and/or their alloys.

5. Prosthetic element as in claim 1, wherein said plastic insert is made with a polymer material chosen from a group comprising polyether ether ketone, polycarbonate-urethane and polyethylene.

6. Prosthetic element as in claim 1, wherein said holes or cavities have width sizes varying in a range from 1200 to 2500 mm and more.

7. Prosthetic element as in claim 1, wherein the pores of the porous layer vary in a range from about 250 to about 1000 mm.

9. Prosthetic element as in claim 1, wherein said solidarization layer and said compact layer are made solid each other with a material based on pure titanium, or an alloy thereof, or cobalt alloys, tantalum alloys or other suitable biocompatible alloy.

8. Method to make an integrated prosthetic element usable for bone implant operations as a femoral, shoulder or knee prosthesis, or as a bone filler or replacement, insert or shell, comprising at least a metal support and an insert made of plastic material coupled with at least a first surface of said metal support so as to define a wear surface, or insert, of adjustable thickness, open towards a mobile part of a prothesis, said metal support comprising, on the side opposite said first surface, a second surface intended to be coupled with the bone part on which the prosthesis or bone replacement is installed, the method comprising making the metal support so as to define at least an intermediate compact layer between said first and said second surface, wherein cavities or holes are made on said first surface which extend internally said first surface so as to define a solidarization layer, whereas on said second surface there is a surface porosity, and feeding, casting or injecting plastic material in a liquid or semi-liquid state, which penetrates into said cavities or holes of the solidarization layer until the compact layer is reached, wherein said cavities or holes extend inside and create at least undercuts, or are open cavities intercommunicating and connected with each other, and wherein said metal support and the relative first and second surface are made in a single process using either an EBM (Electron Beam Melting) technique or a technique using a high power laser ray, on a powder material selected between pure titanium, or an alloy thereof, or cobalt alloys, tantalum alloys or other suitable biocompatible alloy.