Implantable article with ablated surface

• US 5,716,412 A
• Filed: 09/30/1996
• Issued: 02/10/1998
• Est. Priority Date: 09/30/1996
• Status: Expired due to Term

• Current Assignee: DePuy Orthopaedics Incorporated (Johnson & Johnson)
• Original Assignee: Johnson & Johnson Professional Company Incorporated (Johnson & Johnson)
• Inventors: Noiles, Douglas G., DeCarlo, Alfred F. Jr.
• Primary Examiner(s): ISABELLA, DAVID J
• Application Number:
  US08/724,493
• Time in Patent Office: 498 Days
• Field of Search: 623/11, 623/16, 623/18, 623/19, 623/20, 623/22, 623/23, 623/66
• US Class Current: 623/23.5
• CPC Class Codes: A61F 2/30771 applied in original prostheses, e.g. holes or grooves
• 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 2002/30118 concentric circles
• CPC Class Codes: A61F 2002/30136 undulated or wavy, e.g. serpentine-shaped or zigzag-shaped
• CPC Class Codes: A61F 2002/30214 having tapered sections of different conicities
• CPC Class Codes: A61F 2002/30225 Flat cylinders, i.e. discs
• CPC Class Codes: A61F 2002/30322 differing in surface structures
• CPC Class Codes: A61F 2002/30808 parallel
• CPC Class Codes: A61F 2002/30817 Intersecting or overlapping blind bores
• CPC Class Codes: A61F 2002/30827 Plurality of grooves
• CPC Class Codes: A61F 2002/30828 parallel
• CPC Class Codes: A61F 2002/30879 Ribs
• CPC Class Codes: A61F 2002/30904 serrated profile, i.e. saw-toothed
• CPC Class Codes: A61F 2002/30952 using CAD-CAM techniques or NC-techniques
• CPC Class Codes: A61F 2002/3097 using laser
• CPC Class Codes: A61F 2002/30976 using hydrojet
• CPC Class Codes: A61F 2002/3401 with radial apertures, e.g. radial bores for receiving fixation screws
• CPC Class Codes: A61F 2002/3403 Polar aperture
• CPC Class Codes: A61F 2002/3417 the outer shell having protrusions on meridian lines, e.g. equidistant fins or wings around the equatorial zone
• CPC Class Codes: A61F 2002/342 : the outer shell having circumferential protrusions parallel to the equatorial plane, e.g. circumferential fins or wings
• CPC Class Codes: A61F 2002/3625 : Necks
• CPC Class Codes: A61F 2002/3631 : with an integral complete or partial peripheral collar or bearing shoulder at its base
• CPC Class Codes: A61F 2002/369 : Stepped shaft, i.e. having discrete diameter changes
• CPC Class Codes: A61F 2230/0004 : Rounded shapes, e.g. with rounded corners
• CPC Class Codes: A61F 2230/0006 : circular
• CPC Class Codes: A61F 2230/0067 : conical
• CPC Class Codes: A61F 2230/0069 : cylindrical
• 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: B23K 26/364 : for making a groove or trench, e.g. for scribing a break initiation groove

Abstract

An implantable article includes a textured bone engaging surface having a surface texture pattern formed by a plurality of furrows separated by ridges that are integral with the base material from which the article is formed. The furrows are formed by ablating in the surface a series of intersecting holes. The side walls of the furrows have scalloped edges. The ablating energy can be applied by techniques such as laser ablation and hydrojet ablation.

Claims

1. An implantable prosthesis, comprising:

a body having a bone engaging surface;

a plurality of furrows formed in at least a portion of the bone engaging surface wherein each furrow has scalloped side walls defined by a series of segments of overlapping holes, each hole having a nominal radius and a nominal diameter; and

a plurality of ridges separating adjacent furrows, the ridges being integral with the body of the prosthesis.

2. The prosthesis of claim 1 wherein the volume of space defined by the furrows is greater than the volume of space defined by the ridges.

3. The prosthesis of claim 2 wherein the depth of each furrow is in the range of about 200 to 1000 microns.

4. The prosthesis of claim 2 wherein the height of each ridge is in the range of about 200 to 1000 microns.

5. The prosthesis of claim 2 wherein each furrow has a width in the range of about 200 to 1500 microns.

6. The prosthesis of claim 2 wherein each ridge has a width in the range of 100 to 750 microns.

7. The prosthesis of claim 1 wherein the nominal distance between the centers of adjacent, intersecting holes is greater than the nominal radius of the holes and less than the nominal diameter of the holes.

8. The prosthesis of claim 7 wherein the nominal distance between the centers of adjacent, intersecting holes is in the range of about 120 to 900 microns.

9. The prosthesis of claim 1 wherein the distance between the centers of adjacent circles in adjacent furrows in the range of about 300 to 1600 microns.

10. The prosthesis of claim 1 wherein the furrows are non-linear.

11. The prosthesis of claim 10 wherein the furrows are curvilinear.

12. The prosthesis of claim 10 wherein the furrows follow a zig-zag pattern.

13. The prosthesis of claim 1 wherein the bone engaging surface of the prosthesis includes a non-planar surface, and the furrows and ridges are formed upon the non-planar surface.

14. The prosthesis of claim 13 wherein the non-planar surface of the prosthesis is a stepped surface.

15. The prosthesis of claim 1 wherein the body is substantially hemispherical having an outer, bone engaging surface and an inner, non-bone engaging surface.

16. The prosthesis of claim 15 wherein at least a portion of the bone engaging surface has furrows oriented longitudinally therein.

17. The prosthesis of claim 15 wherein at least a portion of the bone engaging surface has furrows oriented latitudinally therein.

18. The prosthesis of claim 1 wherein the body is metallic.