Implant with attachment surface

• US 4,608,052 A
• Filed: 04/25/1984
• Issued: 08/26/1986
• Est. Priority Date: 04/25/1984
• Status: Expired due to Term

• Current Assignee: Smith & Nephew Incorporated (Smith & Nephew PLC)
• Original Assignee: 3M Company
• Inventors: Van Kampen, Craig L., Hockert, Eric N.
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Cannon, Alan W.
• Application Number:
  US06/603,777
• Time in Patent Office: 853 Days
• Field of Search: 3/1.913, 3/1.912, 3/1.9, 3/1.91, 3/1.911, 128/92 C, 128/92 CA
• US Class Current: 623/23.29
• CPC Class Codes: A61F 2/0811 Fixation devices for tendons or ligaments
• CPC Class Codes: A61F 2/28 Bones joints A61F2/30
• CPC Class Codes: A61F 2/30771 applied in original prostheses, e.g. holes or grooves
• CPC Class Codes: A61F 2/3094 Designing or manufacturing processes
• CPC Class Codes: A61F 2/34 Acetabular cups
• CPC Class Codes: A61F 2/367 Proximal or metaphyseal parts of shafts trochanteric devices connected to said proximal parts A61F2/30739
• CPC Class Codes: A61F 2/3676 Distal or diaphyseal parts of shafts
• CPC Class Codes: A61F 2/3859 Femoral components
• CPC Class Codes: A61F 2/389 Tibial components A61F2/3868 takes precedence
• CPC Class Codes: A61F 2/4059 Humeral shafts
• CPC Class Codes: A61F 2/4081 Glenoid components, e.g. cups
• CPC Class Codes: A61F 2/4241 for hands, e.g. fingers
• CPC Class Codes: A61F 2002/2835 Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material
• CPC Class Codes: A61F 2002/30322 differing in surface structures
• CPC Class Codes: A61F 2002/30884 Fins or wings, e.g. longitudinal wings for preventing rotation within the bone cavity
• CPC Class Codes: A61F 2002/3097 using laser
• CPC Class Codes: A61F 2002/3631 with an integral complete or partial peripheral collar or bearing shoulder at its base
• CPC Class Codes: A61F 2250/0026 differing in surface structures
• CPC Class Codes: A61F 2310/00017 Iron- or Fe-based alloys, e.g. stainless steel
• 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 2310/00203 : containing alumina or aluminium oxide
• CPC Class Codes: Y10T 428/12993 : Surface feature [e.g., rough, mirror]

Abstract

An implant for use in a human body having an integral attachment surface adapted to permit tissue ingrowth. The attachment surface has an inner attachment surface and a multiplicity of spaced posts projecting from the inner attachment surface. The posts each have side attachment surfaces which are generally cylindrically concave, intersect to define post edges, and are radiused at their intersections with the inner attachment surface. A method of forming the attachment surface on an implant with a laser is also included.

Claims

1. An implant for use in a human body, said implant having an integral attachment surface adapted to permit ingrowth of living tissue, said attachment surface being defined (1) by a multiplicity of adjacent, generally part-spherical, concave surface parts within said implant having intersecting, generally aligned rims defining an inner attachment surface portion within said implant and (2) by a multiplicity of spaced posts projecting from said inner attachment surface portion, said posts each having a plurality of side attachment surfaces, which side attachment surfaces (1) are generally cylindrically concave, (2) intersect to define post edges, and (3) are radiused at their intersections with said concave surface parts.

2. The implant according to claim 1 wherein said side attachment surfaces are generally cylindrically concave about mutually parallel axes and said side attachment surfaces intersect to define generally sharp, mutually parallel post edges.

3. The implant according to claim 2 wherein said axies are generally perpendicular to said inner attachment surface portion.

4. The implant according to claim 3 wherein said post edges extend generally perpendicular to said inner attachment surface portion.

5. The implant according to claim 1 wherein said posts are each elongate.

6. The implant according to claim 5 wherein said attachment surface is formed by a laser.

7. The implant according to claim 6 wherein said posts all have a generally equal length.

8. The implant according to claim 7 wherein said posts each further have a width-increasing protrusion on a free end portion thereof.

9. An implant for use in a human body, said implant having an integral attachment surface adapted to permit ingrowth of living tissue, said attachment surface being defined (1) by a multiplicity of adjacent, generally concave surface parts within said implant having intersecting, generally aligned rims defining an inner attachment surface portion within said implant and (2) by a multiplicity of spaced posts projecting from said inner attachment surface portion, said posts each having a plurality of side attachment surfaces, which side attachment surfaces (1) are generally cylindrically concave about mutually parallel axes, (2) intersect to define generally sharp, mutually parallel post edges, and (3) are radiused at their intersections with said concave surface parts.

10. The implant according to claim 9 wherein said concave surface parts are each generally part spherical.

11. The implant according to claim 9 wherein said axes are generally perpendicular to said inner attachment surface portion.

12. The implant according to claim 11 wherein said post edges extend generally perpendicular to said inner attachment surface portion.

13. The implant according to claim 9 wherein said posts are each elongate.

14. The implant according to calim 13 wherein said attachment surface is formed by a laser.

15. The implant according to claim 14 wherein said posts all have a generally equal length.

16. An implant for use in a human body, said implant having an integral attachment surface adapted to permit ingrowth of living tissue, said attachment surface being defined (1) by a multiplicity of adjacent, generally concave surface parts within said implant having intersecting, generally aligned rims defining an inner attachment surface portion within said implant and (2) by a multiplicity of spaced posts projecting from said inner attachment surface portion, said posts each having a plurality of side attachment surfaces, which side attachment surfaces (1) are generally cylindrically concave, (2) intersect to define post edges, and (3) are radiused at their intersections with said concave surface parts, so that an open, continuous space surrounding said spaced posts is provided wherein said living tissue is permitted to grow towards said inner attachment surface portion.

17. The implant according to claim 16 wherein said concave surface parts are each generally part spherical.

18. The implant according to claim 16 wherein said side attachment surfaces are generally cylindrically concave about mutually parallel axes and said side attachment surfaces intersect to define generally sharp, mutually parallel post edges.

19. The implant according to claim 18 wherein said axes are generally perpendicular to said inner attachment surface portion.

20. The implant according to claim 19 wherein said post edges extend generally perpendicular to said inner attachment surface portion.

21. The implant according to claim 16 wherein said posts are each elongate.

22. The implant according to claim 21 wherein said attachment surface is formed by a laser.