Hip prosthesis and designing method thereof

• US 20050021149A1
• Filed: 02/14/2002
• Published: 01/27/2005
• Est. Priority Date: 10/23/2001
• Status: Active Grant

• Current Assignee: Adelina Teresa Maria Borruto
• Original Assignee: Universita Degli Studi Di Cagliari
• Inventors: Marrelli, Luigi, Borruto, Adelina Teresa Maria
• Granted Patent: US 7,896,925 B2
• Time in Patent Office: Days
• US Class Current: 623/22.150
• 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 hip prosthesis, comprising a first prosthetic body reproducing an acetabular cup and a second prosthetic body reproducing a femoral head and apt to be coupled to said first prosthetic body, characterized in that said prosthetic bodies have low debris production and in that said first prosthetic body has a wettability (θ

) substantially different from that of said second prosthetic body.

2. The prosthesis according to claim 1, wherein one of said prosthetic bodies is made of a CoCr alloy and the other one of Peek reinforced with Carbon fibres.

3. The prosthesis according to claim 2, wherein said Peek is reinforced with monodirectional thin Carbon fibres.

4. The prosthesis according to claim 2, wherein said Peek is reinforced with randomly-oriented Carbon fibres.

5. The prosthesis according to claim 1, wherein said prosthetic bodies have a difference (Δ

θ

) between the respective angles of wettability which is greater than 10 deg.

6. The prosthesis according to claim 5, wherein the one of said prosthetic bodies has an angle of wettability (θ

) lower than 50 deg, and the other one of said prosthetic bodies has an angle of wettability greater than 60 deg.

7. The prosthesis according to claim 5, wherein said prosthetic bodies have a difference (Δ

θ

) between the respective angles of wettability which is equal to or greater than 15 deg.

8. A designing method of a hip prosthesis comprising two prosthetic bodies reproducing an acetabular cup and a femoral head, respectively, characterized in that it provides that said prosthetic bodies have a low debris production and a substantially different wettability (θ

).

9. The method according to claim 8, comprising a step of material selection which provides the use of a CoCr alloy for manufacturing one of said prosthetic bodies and the use of Peek reinforced with Carbon fibres to manufacture the other of said bodies.

10. The method according to claim 9, wherein said Peek is of the type reinforced with monodirectional thin Carbon fibres.

11. The method according to claim 9, wherein said Peek is of the type reinforced with randomly-oriented Carbon fibres.

12. The method according to claim 8, which provides said prosthetic bodies to have a difference (Δ

θ

) between the respective angles of wettability greater than 10 deg.

13. The method according to claim 12, which provides one of said prosthetic bodies to have an angle of wettability (θ

) greater than 50 deg, and the other of said prosthetic bodies to have an angle of wettability greater than 60 deg.

14. The method according to claim 12, which provides said prosthetic bodies to have a difference (Δ

θ

) between the respective angles of wettability equal to or greater than 15 deg.