BONE IMPLANT HAVING ENGINEERED SURFACES

• US 20080154378A1
• Filed: 12/22/2006
• Published: 06/26/2008
• Est. Priority Date: 12/22/2006
• Status: Abandoned Application

• Current Assignee: Warsaw Orthopedic Incorporated (Medtronic Plc)
• Original Assignee: Warsaw Orthopedic Incorporated (Medtronic Plc)
• Inventors: Pelo, Mark J.
• Application Number:
  US11/615,158
• Publication Number:
  US 20080154378A1
• Time in Patent Office: Days
• US Class Current: 623/17.16
• CPC Class Codes: A61B 17/866 Material or manufacture
• CPC Class Codes: A61F 2/30771 applied in original prostheses, e.g. holes or grooves
• CPC Class Codes: A61F 2/4425 made of articulated components
• CPC Class Codes: A61F 2002/2817 Bone stimulation by chemical reactions or by osteogenic or biological products for enhancing ossification, e.g. by bone morphogenetic or morphogenic proteins [BMP] or by transforming growth factors [TGF]
• CPC Class Codes: A61F 2002/30649 Ball-and-socket joints
• CPC Class Codes: A61F 2002/3082 Grooves
• CPC Class Codes: A61F 2002/30823 having the shape of a reverse dovetail
• CPC Class Codes: A61F 2002/30841 Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/30879 Ribs
• CPC Class Codes: A61F 2002/30884 Fins or wings, e.g. longitudinal wings for preventing rotation within the bone cavity
• CPC Class Codes: A61F 2002/30902 laterally or radially
• CPC Class Codes: A61F 2310/00029 Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium
• CPC Class Codes: A61F 2310/00796 Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite

Abstract

The present disclosure is directed to an implantable device that is machined to have a bone engaging interface defining cavities that may be deposited with bone growth promoting material.

Claims

1. An implant comprising:

a body; and

a bone engaging interface formed on a portion of the body and shaped to favor movement of the implant in a first direction and to resist movement in a second direction opposite the first direction.

2. The implant of claim 1 wherein the bone engaging interface includes a set of protrusions defining a plurality of bone ingrowth cavities.

3. The implant of claim 2 wherein the set of protrusions are angled in the second direction relative to the body.

4. The implant of claim 2 wherein the set of protrusions includes a first subset of protrusions and a second subset of protrusions, the first subset of protrusions extending from the body more than the second subset of protrusions.

5. The implant of claim 2 further comprising bone growing material in the plurality of bone ingrowth cavities.

6. The implant of claim 1 wherein the bone engaging interface is configured to resist movement in the second direction when a load is placed thereon.

7. The implant of claim 1 wherein the bone engaging interface is formed by laser machining the body.

8. A intervertebral prosthetic joint comprising:

a first articular component and a second articular component;

a first bone engaging surface defined on a portion of the first articulur component;

a second bone engaging surface defined on a portion of the second articulur component, and

wherein each bone engaging surface is configured to provide a migration promoting interface along a first direction and provide an anti-migratory interface along a second direction opposite the first direction.

9. The joint of claim 8 wherein each bone engaging surface includes a laser-machined set of protrusions defining a first plurality and a second plurality of bone ingrowth cavities.

10. The joint of claim 9 wherein at least a portion of the first plurality and the second plurality of bone ingrowth cavities contains bone growth promoting material.

11. An implant comprising:

an implant body having a bone engaging surface;

a plurality of cavities formed by machining a portion of the bone engaging surface of the implant body; and

bone growth material deposited in the plurality of cavities.

12. The implant of claim 11 further comprising a set of protrusions extending from the implant body and defining the plurality of cavities, the set of protrusions being directionally aligned at an angle relative to the implant body.

13. The implant of claim 12 wherein the set of protrusions provide a non-gripping interface when the implant body is translated along a first direction and provide a bone-gripping interface when the implant body is translated along a second direction opposite the first direction.

14. The implant of claim 12 wherein the set of protrusions includes a first subset of protrusions and a second subset of protrusions different in at least one of height, spacing, shape, and depth from the first subset of protrusions.

15. A surgical method for positioning an intervertebral implant, the method comprising:

preparing a disc space for reception of an intervertebral implant;

inserting the intervertebral implant, along a first direction, into the disc space;

commencing withdrawing the intervertebral implant from the disc space along a second direction opposite the first direction; and

terminating withdrawal of the intervertebral implant when the intervertebral implant engages a vertebral body defining the disc space.

16. A method of manufacturing an implant, the method comprising:

forming an implant body;

machining the implant body to define a plurality of protrusions and cavities; and

depositing bone growth promoting material in the cavities.

17. The method of claim 16 wherein the machining includes defining the protrusions to be angled in a direction of implantation.

18. The method of claim 16 wherein the defining includes forming the protrusions to provide a non-gripping face for when the intervertebral implant is inserted into a disc space and to provide a gripping face for when the intervertebral implant is withdrawn from the disc space.

19. The method of claim 16 wherein the machining includes defining a first set of protrusions to have a first height and a second set of protrusions to have a second height different from the first height.

20. The method of claim 16 wherein the machining includes laser machining.

21. The method of claim 16 wherein the machining includes EDM.

22. A bone screw comprising:

a shaft;

a plurality of threads formed on the shaft and spaced from one another; and

a bone ingrowth cavity formed in the shaft in a space between a pair of threads.

23. The bone screw of claim 22 wherein the bone ingrowth cavity is formed by laser-machining of the shaft.

24. The bone screw of claim 22 further comprising bone growth material deposited in the bone ingrowth cavity.

25. The bone screw of claim 22 wherein the bone ingrowth cavity is shaped to have an opening that is smaller in width than a maximum width of the bone ingrowth cavity.