Hip prosthesis and designing method thereof

• US 7,896,925 B2
• Filed: 02/14/2002
• Issued: 03/01/2011
• Est. Priority Date: 10/23/2001
• Status: Expired due to Fees

• Current Assignee: Adelina Teresa Maria Borruto
• Original Assignee: Universita Degli Studi Di Cagliari
• Inventors: Marrelli, Luigi, Borruto, Adelina Teresa Maria
• Primary Examiner(s): Robert; Eduardo C
• Assistant Examiner(s): COMSTOCK, DAVID C
• Application Number:
  US10/493,285
• Publication Number:
  US 20050021149A1
• Time in Patent Office: 3,302 Days
• Field of Search: 623/22.15, 623/22.33, 623/23.3, 623/23.35, 623/23.36, 623/23.55, 623 2357- 2359
• US Class Current: 623/22.15
• CPC Class Codes: A61F 2/30965 Reinforcing the prosthesis by embedding particles or fibres during moulding or dipping
• CPC Class Codes: A61F 2/32 for the hip
• CPC Class Codes: A61F 2/34 Acetabular cups
• CPC Class Codes: A61F 2/468 Testing instruments for artificial joints for testing non-implantable prostheses A61F2/76
• CPC Class Codes: A61F 2002/30009 differing in fibre orientations
• CPC Class Codes: A61F 2002/30031 differing in wettability, e.g. in hydrophilic or hydrophobic behaviours
• CPC Class Codes: A61F 2002/30685 Means for reducing or preventing the generation of wear particulates
• CPC Class Codes: A61F 2002/3611 Heads or epiphyseal parts of femur
• CPC Class Codes: A61F 2250/0028 differing in fibre orientations
• CPC Class Codes: A61F 2250/0056 differing in wettability, e.g. in hydrophilic or hydrophobic behaviours
• CPC Class Codes: A61F 2310/00029 Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
• CPC Class Codes: A61L 27/045 Cobalt or cobalt alloys
• CPC Class Codes: A61L 27/443 with carbon fillers
• CPC Class Codes: A61L 27/50 Materials characterised by their function or physical properties , e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
• CPC Class Codes: C08L 71/00 Compositions of polyethers obtained by reactions forming an ether link in the main chain of polyacetals C08L59/00; of epoxy resins C08L63/00; of polythioether-ethers C08L81/02; of polyether-sulfones C08L81/06; Compositions of derivatives of such polymers

Abstract

Hip prosthesis, comprising a first prosthetic body reproducing an acetabular cup and a second prosthetic body reproducing a femoral head and apt to work coupled to the first prosthetic body, wherein the prosthetic bodies have low debris production and different wettability (θ) (FIG. 20A).

Claims

1. A manufacturing method of a hip prosthesis comprising two prosthetic bodies reproducing an acetabular cup and a femoral head, respectively,

which method provides that said prosthetic bodies have a low debris production,

which method comprises:

a step of selecting a CoCr alloy for manufacturing one of said bodies and PEEK reinforced with carbon fibres for manufacturing the other of said bodies;

a step of lapping a surface of said CoCr alloy so as to obtain an angle of wettability of about 47 degrees;

a step of lapping a surface of said PEEK reinforced with carbon fibres so as to obtain an angle of wettability of about 64 degrees,

so as to provide a large different surface wettability between said materials, one having an essentially hydrophilic and the other one an essentially hydrophobic behaviour or one a slightly hydrophilic and the other one a marked hydrophobic behaviour, or vice-versa,

said prosthetic bodies having a difference between the respective angles of wettability greater than 10 degrees.

2. The method according to claim 1, wherein said PEEK is of the type reinforced with monodirectional thin Carbon fibres.

3. The method according to claim 1, wherein said PEEK is of the type reinforced with randomly-oriented Carbon fibres.