Anchor for an implant assembly

• US 9,861,492 B2
• Filed: 03/06/2015
• Issued: 01/09/2018
• Est. Priority Date: 03/07/2014
• Status: Active Grant

• Current Assignee: Arthrosurface, Inc (Anika Therapeutics Incorporated)
• Original Assignee: Arthrosurface, Inc (Anika Therapeutics Incorporated)
• Inventors: Ek, Steven W.
• Primary Examiner(s): Stewart, Jason-Dennis
• Application Number:
  US14/640,602
• Publication Number:
  US 20150250475A1
• Time in Patent Office: 1,040 Days
• CPC Class Codes: A61B 17/0642 for bones, e.g. for osteosynthesis or connecting tendon to bone
• CPC Class Codes: A61B 2017/0409 Instruments for applying suture anchors for applying suture clamps, clips or locks A61B2017/0488
• CPC Class Codes: A61B 2017/044 with a threaded shaft, e.g. screws
• CPC Class Codes: A61B 2017/0648 threaded, e.g. tacks with a screw thread
• CPC Class Codes: A61F 2/28 Bones joints A61F2/30
• CPC Class Codes: A61F 2/30 Joints
• CPC Class Codes: A61F 2/30756 Cartilage endoprostheses A61F2/3603 takes precedence
• CPC Class Codes: A61F 2/40 for shoulders
• CPC Class Codes: A61F 2/4081 Glenoid components, e.g. cups
• CPC Class Codes: A61F 2/4606 of wrists or ankles; of hands, e.g. fingers; of feet, e.g. toes
• CPC Class Codes: A61F 2/4618 of cartilage
• CPC Class Codes: A61F 2/4637 for connecting or disconnecting two parts of a prosthesis
• CPC Class Codes: A61F 2002/30331 made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2002/30364 Rotation about the common longitudinal axis
• CPC Class Codes: A61F 2002/30405 made by screwing complementary threads machined on the parts themselves
• CPC Class Codes: A61F 2002/30462 retained or tied with a rope, string, thread, wire or cable
• CPC Class Codes: A61F 2002/305 Snap connection
• CPC Class Codes: A61F 2002/30649 Ball-and-socket joints
• CPC Class Codes: A61F 2002/3085 with a threaded, e.g. self-tapping, bone-engaging surface, e.g. external surface
• CPC Class Codes: A61F 2002/4627 with linear motion along or rotating motion about the instrument axis or the implantation direction, e.g. telescopic, along a guiding rod, screwing inside the instrument
• CPC Class Codes: A61F 2002/4628 : with linear motion along or rotating motion about an axis transverse to the instrument axis or to the implantation direction, e.g. clamping
• CPC Class Codes: A61F 2310/00011 : Metals or alloys

Abstract

A medical device includes an implant anchor comprising first and second opposing end portions. The implant anchor may also include a fixation element to configured to couple the implant anchor to an implant, and an anchor element configured to couple the implant anchor to bone. At least a portion of the implant anchor has a porous structure.

Claims

1. A medical device, comprising:

an implant anchor comprising first and second opposing end portions, said implant anchor further comprising;

a fixation element to configured to couple said implant anchor to an implant; and

an anchor element comprising a threaded shank configured to couple said implant anchor to bone, said threaded shank comprising a screw thread;

wherein at least a portion of said screw thread has a porous structure.

2. The medical device of claim 1, wherein:

said fixation element has a non-porous-structure.

3. The medical device of claim 1, wherein:

said second end portion of said implant anchor comprises said anchor element.

4. The medical device of claim 1, wherein:

at least a portion of said threaded shank is formed by said porous structure.

5. The medical device of claim 4, wherein:

a portion of said screw thread is formed by a non-porous structure.

6. The medical device of claim 4, wherein:

said threaded shank of said implant anchor comprises a shank root; and

at least a portion of said shank root is formed by said porous structure.

7. The medical device of claim 1, wherein:

said porous structure is formed by metal particles.

8. The medical device of claim 1, wherein:

said porous structure is formed by a plurality of layers of metal particles.

9. The medical device of claim 8, wherein:

said metal particles comprise metal powder.

10. The medical device of claim 1, wherein:

said porous structure comprises a skeletal framework and a plurality of interstices arranged in an orderly geometric pattern of repeating unit cells.

11. The medical device of claim 10, wherein:

said repeating cell unit is a dodecahedron.

12. The medical device of claim 10, wherein:

said skeletal framework is formed by a plurality of struts; and

said struts have a thickness in a range of 150 μ

m to 300 μ

m.

13. The medical device of claim 10, wherein:

said interstices have a size in a range of 240 μ

m to 730 μ

m.

14. The medical device of claim 10, wherein:

said porous structure has a porosity in a range of 55% to 75%.

15. The medical device of claim 10, wherein:

said porous structure comprises a plurality of layers.

16. The medical device of claim 15, wherein:

said plurality of layers form a three-dimensional, multi-layered mesh or lattice structure.

17. The medical device of claim 10, wherein:

said porous structure forms at least a portion of a threaded shank.

18. The medical device of claim 17, wherein:

said porous structure forms a shank root of said threaded shank.

19. The medical device of claim 1, further comprising an implant configured to be coupled said implant anchor.

20. The medical device of claim 19, wherein said implant includes a load bearing surface, a bone facing surface, and a fixation element configured to be coupled to said fixation element of said implant anchor.

21. The medical device of claim 20, wherein said fixation elements of said implant and said implant anchor include mating tapered surfaces configured to form a frictional connection therebetween.

22. The medical device of claim 1, wherein said implant anchor includes a longitudinally disposed passageway extending between said first and said second opposing end portions.

23. A medical device, comprising:

an implant including a load bearing surface, a bone facing surface, and a first fixation element; and

an implant anchor comprising first and second opposing end portions, said implant anchor further comprising;

a second fixation element to configured to engage said first fixation element to couple said implant anchor to an implant; and

an anchor element comprising a screw thread having configured to couple said implant anchor to bone;

wherein at least a portion of said screw thread has a porous structure.

24. The medical device of claim 23, wherein said implant anchor includes a longitudinally disposed passageway.

25. A medical device, comprising:

an implant anchor, wherein said implant anchor comprises first and second opposing end portions;

wherein said first end portion of said implant anchor comprises a fixation element to connect said implant anchor to an implant; and

wherein said second end portion of said implant anchor comprises a screw thread having a porous structure to connect said anchor to bone.

26. The medical device of claim 25, wherein said implant anchor includes a longitudinally disposed passageway extending between said first and said second opposing end portions.