Textured surface having undercut micro recesses in a surface

• US 20030065401A1
• Filed: 07/24/2002
• Published: 04/03/2003
• Est. Priority Date: 01/25/2001
• Status: Active Grant

• Current Assignee: Tecomet, Inc.
• Original Assignee: Tecomet, Inc.
• Inventors: Amrich, Mark, Rolfe, Jonathan L., Buturlia, Joseph, Lynch, Robert F.
• Granted Patent: US 7,018,418 B2
• Time in Patent Office: Days
• US Class Current: 623/23.55
• CPC Class Codes: A61B 17/8085 with pliable or malleable elements or having a mesh-like structure, e.g. small strips A61B17/8071, A61B17/8076 take precedence
• CPC Class Codes: A61C 2008/0046 Textured surface, e.g. roughness, microstructure A61C8/0013 takes precedence
• CPC Class Codes: A61C 8/0012 characterised by the material or composition, e.g. ceramics, surface layer, metal alloy use of specific materials A61K6/00
• CPC Class Codes: A61F 2/2803 for mandibular reconstruction temporo-mandibular joints A61F2/3099; bone plates for the jaw A61B17/8071
• CPC Class Codes: A61F 2/30767 Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
• CPC Class Codes: A61F 2/30771 applied in original prostheses, e.g. holes or grooves
• CPC Class Codes: A61F 2/32 for the hip
• CPC Class Codes: A61F 2/34 Acetabular cups
• CPC Class Codes: A61F 2/36 Femoral heads ; Femoral endoprostheses
• CPC Class Codes: A61F 2/3662 Femoral shafts
• CPC Class Codes: A61F 2/3859 Femoral components
• CPC Class Codes: A61F 2/446 having a circular or elliptical cross-section substantially parallel to the axis of the spine, e.g. cylinders or frustocones
• CPC Class Codes: A61F 2002/30149 pentagonal
• CPC Class Codes: A61F 2002/30153 rectangular
• CPC Class Codes: A61F 2002/3021 frustoconical
• CPC Class Codes: A61F 2002/30217 hollow cones, e.g. tubular-like cones
• CPC Class Codes: A61F 2002/30253 ellipsoidal or ovoid
• CPC Class Codes: A61F 2002/30535 Special structural features of bone or joint prostheses not otherwise provided for
• CPC Class Codes: A61F 2002/30777 Oblong apertures
• CPC Class Codes: A61F 2002/30785 parallel
• CPC Class Codes: A61F 2002/30787 : inclined obliquely with respect to each other
• CPC Class Codes: A61F 2002/30838 : Microstructures
• CPC Class Codes: A61F 2002/30873 : Threadings machined on non-cylindrical external surfaces
• CPC Class Codes: A61F 2002/30879 : Ribs
• CPC Class Codes: A61F 2002/30883 : dovetail-shaped
• CPC Class Codes: A61F 2002/30892 : parallel
• CPC Class Codes: A61F 2002/30925 : etched
• 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 2002/3611 : Heads or epiphyseal parts of femur
• 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 2002/365 : Connections of heads to necks
• CPC Class Codes: A61F 2230/0017 : Angular shapes
• CPC Class Codes: A61F 2230/0019 : rectangular
• CPC Class Codes: A61F 2230/0067 : conical
• CPC Class Codes: A61F 2230/0076 : ellipsoidal or ovoid
• CPC Class Codes: A61F 2250/0058 : Additional features; Implant or prostheses properties not otherwise provided for
• 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 2310/00089 : Zirconium or Zr-based alloys
• CPC Class Codes: A61F 2310/00131 : Tantalum or Ta-based alloys
• CPC Class Codes: A61F 2310/00179 : Ceramics or ceramic-like structures
• CPC Class Codes: A61F 2310/00269 : based on metal carbides
• CPC Class Codes: A61F 2310/00329 : Glasses, e.g. bioglass
• CPC Class Codes: B23K 2103/14 : Titanium or alloys thereof
• CPC Class Codes: B32B 3/30 : characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs apertured layer B32B3/266; layer with cavities or internal voids B32B3/26
• CPC Class Codes: C23F 1/02 : Local etching

Abstract

Textured surface having micro recesses such that the outer surface overhangs the micro recesses. Embodiments of the textured surface include sharp edges for promoting bone deposition and growth within the micro recesses, protrusions of varying depth from the surface that include overhangs, and micro recesses that are at least partially defined by complex ellipsoids.

Claims

1. A textured surface comprising:

a base material having a cavity at least partially defined by at least one ellipsoid; and

an undercut projecting over the cavity.

2. The textured surface of claim 1 wherein:

the cavity is at least partially defined by more than one ellipsoid,

the undercut is at least partially defined by a first elliposid having a major axis,

the cavity has a bottom surface at least partially defined by a second ellipsoid having a major axis substantially coincident with the major axis of the second ellipsoid.

3. The textured surface of claim 2 wherein the first ellipsoid has a wider angular projection than the second ellipsoid.

4. The textured surface of claim 1 wherein the ratio of cavity width to cavity depth is at least about 1.

5. The textured surface of claim 1 further comprising a protrusion extending from the bottom surface, the protrusion being defined by at least two of the ellipsoids.

6. The textured surface of claim 5 further comprising an outer surface wherein the protrusion comprises a peak coincident with the outer surface.

7. The textured surface of claim 5 wherein the protrusion further comprises a sub-peak defined by at least two overlapping ellipsoids.

8. The textured surface of claim 5 wherein the protrusion further comprises an intermediate peak located proximate the shortest distance between the at least two ellipsoids.

9. The textured surface of claim 5 wherein the protrusion is defined by at least two non-overlapping ellipsoids.

10. The textured surface of claim 6 wherein the peak overhangs a least a portion of the cavity.

11. The textured surface of claim 1 the base further comprising:

an outer surface including a datum;

a first protrusion having a peak coincident with a datum;

a second protrusion having a sub-peak defined by at least two overlapping ellipsoids; and

a third protrusion having an intermediate peak located between at least two spaced-apart ellipsoids.

12. The textured surface of claim 1 further comprising a plurality of protrusions extending from the bottom surface, each protrusion being defined by one or more ellipsoids.

13. The textured surface of claim 12 wherein the plurality of protrusions are spaced in a regular pattern.

14. The textured surface of claim 13 wherein the regular pattern is substantially a grid.

15. The textured surface of claim 13 wherein the regular pattern is substantially a fractal pattern.

16. The textured surface of claim 12 wherein the plurality of protrusions are spaced in a repeating irregular pattern.

17. The textured surface of claim 16 wherein the repeating irregular pattern is substantially a fractal pattern.

18. The textured surface of claim 1 further comprising a protrusion defined by at least four ellipses.

19. The textured surface of claim 1 wherein the base material is selected from the group consisting of metal, ceramic, glass, and composites thereof.

20. A textured surface comprising:

a multiplicity of cavities arranged in a substantially reproducible pattern the cavities comprising a bottom surface geometry at least partially defined by a first ellipsoid, and

an undercut overhanging a cavity and at least partially defined by a second ellipsoid having a major axis coincident with the first ellipsoid, the second ellipsoid having a wider angular projection than the first ellipsoid.

21. In a prosthetic device having a tissue engaging surface, a pattern comprising:

a cavity recessed from the tissue engaging surface;

a plurality of curved concave surfaces at least partially defined by a complex ellipsoid, the plurality of concave surfaces at least partially defining the bottom of the cavity;

a plurality of projections extending from the bottom of the cavity, the projections having at least one undercut surface at least partially defined by a complex ellipsoid geometry, a portion of the tissue engaging surface laterally extending beyond the cavity to further define the undercut surface.

22. The prosthetic device of claim 21 wherein the complex ellipsoid is a non-spherical complex ellipsoid.

23. The prosthetic device of claim 21 wherein the plurality of curved concave surfaces are serially aligned to form a repeating pattern.

24. The prosthetic device of claim 23 wherein the repeating pattern is a saw-tooth pattern.

25. A prosthetic securement comprising:

a base material having a reticulate surface with a multiplicity of undercut interconnected recesses at least partially defined by a complex ellipsoid; and

a soft-tissue, scratch-fit to the textured surface in promotion of tissue growth, within the interconnected recesses.

26. A tissue implant comprising:

an outer surface having

a datum surface and defining a cavity having a geometry characterized by at least one complex ellipsoid, and

an undercut face projecting over a portion of the cavity.

27. The tissue implant of claim 26 having a rib outwardly protruding from the datum surface.

28. The tissue implant of claim 27 wherein the rib is a thread.

29. The tissue implant of claim 28 wherein the thread is a self-taping thread.

30. The tissue implant of claim 28 comprising a first end and a second end, the thread extending from proximate the first end to proximate the second end.

31. The tissue implant of claim 28 wherein the thread is continuous.

32. The tissue implant of claim 28 wherein the thread is segmented.

33. The tissue implant of claim 27 wherein the rib comprises a cross sectional geometry taken from the group consisting of v-shaped, keystone, curved, trapezoidal, undercut, hourglass, and square.

34. The tissue implant of claim 27 wherein the rib comprises a rib surface that is substantially smooth.

35. The tissue implant of claim 26 further comprising a longitudinal axis, and a plurality of ribs outwardly projecting from the outer surface, the ribs being radially disposed about the longitudinal axis.

36. The tissue implant of claim 35 wherein the ribs are substantially parallel to each other.

37. The tissue implant of claim 27 wherein the ribs are longitudinally disposed on the implant.

38. The tissue implant of claim 35 wherein the ribs are disposed on the implant oblique to the longitudinal axis.

39. The tissue implant of claim 27 further comprising:

a longitudinal axis,

a wall, disposed about the longitudinal axis, characterized by an inner surface and the outer surface, and

an aperture extending from the inner surface to the outer surface.

40. A tissue implant comprising:

a base disposed about a longitudinal axis;

a rib protruding outwardly from the base; and

a textured surface on the base having

a datum,

a plurality of interconnected recesses abutting the datum,

and an undercut face projecting over a portion of the recesses.

41. The tissue implant of claim 40 wherein the interconnected recesses further comprise a geometry defined by a non-spherical ovoid.

42. The tissue implant of claim 41 wherein the non-spherical ovoid is a complex ellipsoid.

43. The tissue implant of claim 40 wherein base further comprises a wall, disposed about the longitudinal axis, having a first outer surface and the rib further comprises a second outer surface contiguous with the first outer surface, the textured surface being at least a portion of the first outer surface, and at least a portion of the second outer surface being substantially smooth.

44. The tissue implant of claim 40 wherein the wall further comprises an aperture defined by an inner surface.

45. The tissue implant of claim 44 wherein the textured surface is at least a portion of the inner surface.

46. The tissue implant of claim 40 wherein the interconnected recesses have a geometry at least partially defined by a complex ellipsoid having a major axis oblique to the datum.

47. The tissue implant of claim 40 wherein the interconnected recesses have a geometry at least partially defined by a complex ellipsoid having a major axis oblique to the longitudinal axis.

48. The tissue implant of claim 40 wherein the interconnected recesses have a geometry at least partially defined by a complex ellipsoid having a major axis oblique to the datum.

49. The tissue implant of claim 40 wherein the interconnected recesses have a geometry at least partially defined by a complex ellipsoid having a major axis oblique to the longitudinal axis and to the datum.

50. A method for relieving strain from a titanium surface comprising:

applying a maskant to the titanium surface;

ablating at least a portion of the maskant to expose the surface;

etching the exposed surface to relieve strain from the titanium.

51. The method of claim 50 wherein the etching further comprises forming interconnected recesses that are at least partially defined by non-spherical complex ellipsoids.

52. The method of claim 51 wherein the ablating further comprises laser ablating.

53. The method of claim 51 wherein the laser ablating increasing a localized strain proximate the portion of the ablated maskant.

54. A strain relieved implant comprising:

a base material having a datum surface;

a surface skin beneath the datum; and

a plurality of interconnected recesses abutting the datum wherein the skin is substantially from strain.

55. A surface including a structure comprising:

a plateau;

a cavity beneath the plateau, and

a concave face depending from the plateau and extending over the cavity.