Implantable orthopaedic device and method for making the same

• US 7,938,861 B2
• Filed: 04/15/2003
• Issued: 05/10/2011
• Est. Priority Date: 04/15/2003
• Status: Expired due to Fees

• Current Assignee: Depuy Products Incorporated (Johnson & Johnson)
• Original Assignee: Depuy Products Incorporated (Johnson & Johnson)
• Inventors: Hanes, Mark, King, Richard
• Primary Examiner(s): Robert; Eduardo C
• Assistant Examiner(s): COMSTOCK, DAVID C
• Application Number:
  US10/413,765
• Publication Number:
  US 20040210316A1
• Time in Patent Office: 2,947 Days
• Field of Search: 623/18.11, 623/22.11, 623 2213- 2215, 623/22.21, 623/26, 623/22.3, 623/33, 623 2329- 30, 623/23.36, 623/40, 623/23.43, 623/23.5, 623/23.55, 623 2357- 2359, 623/22.26, 623/22.33, 623/23.3, 623/23.4
• US Class Current: 623/18.11
• CPC Class Codes: A61L 27/34 Macromolecular materials
• CPC Class Codes: A61L 27/56 Porous materials, e.g. foams or sponges
• CPC Class Codes: C08L 23/06 Polyethene
• CPC Class Codes: C08L 2312/06 by radiation
• CPC Class Codes: C08L 2666/22 Macromolecular compounds not provided for in C08L2666/16 - C08L2666/20
• CPC Class Codes: C08L 71/02 Polyalkylene oxides

Abstract

A polymeric implantable orthopaedic device that includes a first layer and a second layer where the first layer has a porosity that is different from the second layer is described. An associated method of producing a polymeric implantable orthopaedic device that includes a first layer and a second layer where the first layer has a porosity that is different from the second layer is also described.

Claims

1. An implantable orthopaedic bearing, consisting of:

a polymeric body member defining a structure selected from the group consisting of (i) an acetabular bearing configured to be implanted into an acetabulum of a patient, (ii) a glenoid bearing configured to be implanted into a glenoid of a patient, and (iii) a tibial bearing configured to be implanted into a tibia of a patient, the body member having a first portion and a second portion, the second portion being integrally attached to the first portion, wherein (i) the first portion of the polymeric body member has a plurality of pores defined therein, (ii) the second portion of the polymeric body member is substantially free of pores, and (iii) the second portion of the polymeric body member has a surface that defines a concave articulating surface upon which a natural or prosthetic component bears.

2. The implantable orthopaedic bearing of claim 1, wherein:

the porosity of the first portion of the polymeric body member is from about 20% to about 50%.

3. The implantable orthopaedic bearing of claim 2, wherein:

a substantial portion of the pores of the first portion have a diameter in range of from about 10 microns to about 400 microns.

4. The implantable orthopaedic bearing of claim 3, wherein:

the first portion has an open porous structure.

5. The implantable orthopaedic bearing of claim 1, wherein:

the polymeric body member is sterile.

6. An implantable orthopaedic device, consisting of:

a polymeric bearing component selected from the group consisting of (i) an acetabular bearing component configured to be implanted into an acetabulum of a patient, (ii) a glenoid bearing component configured to be implanted into a glenoid of a patient, and (iii) a tibial bearing component configured to be implanted into a tibia of a patient, the polymeric bearing component having a first layer attached to a second layer, wherein (i) the second layer has a concave articulating surface upon which a natural or prosthetic component bears defined thereon, (ii) the first layer has a first porosity, (iii) the second layer has a second porosity, and (iv) the first porosity is greater than the second porosity.

7. The implantable orthopaedic device of claim 6, wherein:

the first layer of the polymeric bearing component includes UHMWPE.

8. The implantable orthopaedic device of claim 6, wherein:

the second layer of the polymeric bearing component includes crosslinked UHMWPE.

9. The implantable orthopaedic device of claim 8, wherein:

porosity of the first layer of the polymeric bearing component is from about 20% to about 50%.

10. The implantable orthopaedic device of claim 8, wherein:

the first layer has pores within a size range of from about 10 microns in diameter to about 400 microns in diameter.

11. The implantable orthopaedic device of claim 6, wherein:

the first layer of the polymeric bearing component includes UHMWPE, and

the second layer of the polymeric bearing component includes crosslinked UHMWPE.

12. The implantable orthopaedic device of claim 6, wherein:

the first layer of the polymeric bearing component includes PMMA.

13. The implantable orthopaedic device of claim 6, wherein:

the first layer of the polymeric bearing component includes PMMA, and

the second layer of the polymeric bearing component includes crosslinked UHMWPE.

14. The implantable orthopaedic device of claim 6, wherein:

the first layer of the polymeric bearing component has an open porous structure.