Platform for soft tissue attachment

• US 9,445,902 B2
• Filed: 10/20/2010
• Issued: 09/20/2016
• Est. Priority Date: 11/03/2009
• Status: Active Grant

• Current Assignee: Howmedica Osteonics Corp. (Stryker Corporation)
• Original Assignee: Howmedica Osteonics Corp. (Stryker Corporation)
• Inventors: Klein, Robert W., Essner, Aaron, Napolitano, Anthony P.
• Primary Examiner(s): SNOW, BRUCE EDWARD
• Application Number:
  US13/504,204
• Publication Number:
  US 20120253474A1
• Time in Patent Office: 2,162 Days
• Field of Search: 623/14.12, 623/23.51, 623/23.52, 623/23.53, 623/23.76, 623/16.11
• US Class Current: 1/1
• CPC Class Codes: A61F 2/28 Bones joints A61F2/30
• CPC Class Codes: A61F 2/30756 Cartilage endoprostheses A61F2/3603 takes precedence
• CPC Class Codes: A61F 2002/30011 differing in porosity
• CPC Class Codes: A61F 2002/30062 (bio)absorbable, biodegradable, bioerodable, (bio)resorbable, resorptive
• CPC Class Codes: A61F 2002/30766 Scaffolds for cartilage ingrowth and regeneration
• CPC Class Codes: A61F 2002/3092 having an open-celled or open-pored structure
• CPC Class Codes: A61F 2002/30962 using stereolithography
• CPC Class Codes: A61F 2210/0004 bioabsorbable
• CPC Class Codes: A61F 2250/0023 differing in porosity
• CPC Class Codes: A61F 2310/00041 Magnesium or Mg-based alloys
• CPC Class Codes: A61L 2430/02 for reconstruction of bones; weight-bearing implants
• CPC Class Codes: A61L 27/047 Other specific metals or alloys not covered by A61L27/042 - A61L27/045 or A61L27/06
• CPC Class Codes: A61L 27/56 Porous materials, e.g. foams or sponges
• CPC Class Codes: B33Y 80/00 Products made by additive manufacturing

Abstract

One embodiment of the implant comprises a porous metal bone ingrowth portion (14) having a first side connected to a high density or solid (fully dense) metal portion (16) which in turn has an opposite side connected to a porous metal soft tissue ingrowth portion (12) thus forming a sandwich structure with the high density or fully dense portion in the middle. The implant may be made of a resorbable material such as an alloy of magnesium. Alternately, the alloy can be selected from the group consisting of calcium, iron, yttrium and lithium. The porous metal soft tissue ingrowth portion (12) has porosity characteristics allowing cartilage to interdigitate with the pores and extend outwardly beyond the platform of the metal surface towards a joint capsule. The solid or fully dense intermediate layer 16 may have some porosity, however that porosity prevents either bone tissue or cartilage tissue from migrating therethrough.

Claims

1. An implant comprising:

an entirely resorbable porous fused magnesium alloy powder bone ingrowth portion 1.4 to 1.6 mm thick made entirely of the resorbable magnesium alloy;

a high density metal portion made entirely of a resorbable fused magnesium alloy powder having a first side fused to the porous bone ingrowth portion; and

a porous metal soft tissue ingrowth portion entirely made of a resorbable fused magnesium alloy powder fused to a second side of the high density portion.

2. The implant as set forth in claim 1 wherein the high density portion has insufficient porosity to allow bone to migrate therethrough.

3. The implant as set forth in claim 1 wherein the high density portion is fully dense.

4. The implant as set forth in claim 1 where in the magnesium allow is a calcium magnesium alloy.