Orthopaedic implant with porous structural member

• US 9,700,431 B2
• Filed: 03/03/2015
• Issued: 07/11/2017
• Est. Priority Date: 08/13/2008
• Status: Active Grant

• Current Assignee: SMed TA/TD, LLC. (Sites Medical LLC)
• Original Assignee: SMed TA/TD, LLC. (Sites Medical LLC)
• Inventors: Nebosky, Paul S., Stalcup, Gregory C.
• Primary Examiner(s): Hammond, Ellen C
• Assistant Examiner(s): BRAY, STUART SAMUEL
• Application Number:
  US14/637,142
• Publication Number:
  US 20150238324A1
• Time in Patent Office: 861 Days
• Field of Search: None
• CPC Class Codes: A61F 2/3094 Designing or manufacturing processes
• CPC Class Codes: A61F 2/30965 Reinforcing the prosthesis by embedding particles or fibres during moulding or dipping
• CPC Class Codes: A61F 2/4465 having a circular or kidney shaped cross-section substantially perpendicular to the axis of the spine
• CPC Class Codes: A61F 2/447 substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section
• CPC Class Codes: A61F 2002/30028 differing in tissue ingrowth capacity, e.g. made from both ingrowth-promoting and ingrowth-preventing parts
• CPC Class Codes: A61F 2002/3008 radio-opaque, e.g. radio-opaque markers
• CPC Class Codes: A61F 2002/30261 parallelepipedal
• CPC Class Codes: A61F 2002/30322 differing in surface structures
• CPC Class Codes: A61F 2002/30387 Dovetail connection
• CPC Class Codes: A61F 2002/30451 soldered or brazed or welded
• CPC Class Codes: A61F 2002/30492 using a locking pin
• CPC Class Codes: A61F 2002/305 Snap connection
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30599 stackable
• CPC Class Codes: A61F 2002/30622 Implant for fusing a joint or bone material
• CPC Class Codes: A61F 2002/30677 Means for introducing or releasing pharmaceutical products, e.g. antibiotics, into the body
• CPC Class Codes: A61F 2002/30733 Inserts placed into an endoprosthetic cavity, e.g. for modifying a material property
• CPC Class Codes: A61F 2002/30841 Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/3097 using laser
• CPC Class Codes: A61F 2002/30971 Laminates, i.e. layered products
• 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 2310/00203 : containing alumina or aluminium oxide
• CPC Class Codes: A61F 2310/00293 : containing a phosphorus-containing compound, e.g. apatite

Abstract

An orthopedic implant includes an implant body having a first surface with a first peak, a second surface opposite the first surface, and a cavity formed therein that extends through the first surface and second surface. The implant body is substantially non-porous. A load bearing member comprising a substantially porous material is held within the cavity. The load bearing member has a first contact surface that extends out of the cavity past the first peak of the first surface.

Claims

1. An orthopaedic implant, comprising:

an implant body having a first surface with a first peak, a second surface opposite said first surface, and a cavity formed therein that extends through said first surface and said second surface, said implant body being substantially non-porous; and

a load bearing member comprising a substantially porous material held within said cavity, said load bearing member having a first contact surface extending out of said cavity past said first peak of said first surface and a second contact surface opposite said first contact surface, said load bearing member having interconnecting pores extending from said first contact surface to said second contact surface, said load bearing member having a total volume and said interconnecting pores in aggregate occupying at least 60% of said total volume.

2. The orthopaedic implant according to claim 1, wherein said first contact surface defines a thickness extending past said first surface.

3. The orthopaedic implant according to claim 2, wherein said thickness of said first contact surface relative to said first surface is constant throughout said first contact surface.

4. The orthopaedic implant according to claim 1, wherein said second surface of said implant body has a second peak, said second contact surface extending out of said cavity past said second peak.

5. The orthopaedic implant according to claim 1, wherein said load bearing member comprises at least one of polyether ether ketone (PEEK), tantalum, and titanium.

6. The orthopaedic implant according to claim 1, wherein said interconnecting pores in aggregate occupy at least 80% of said total volume.

7. The orthopaedic implant according to claim 1, wherein said implant body has a third surface with an opening formed therethrough to said cavity.

8. The orthopaedic implant according to claim 1, wherein said first surface defines a first surface area and said first contact surface defines a contact surface area, said first surface area and said contact surface area together defining a total surface area, said contact surface area being at least 40% of said total surface area.

9. The orthopaedic implant according to claim 1, further including an ingrowth material covering at least a portion of said first surface of said implant body and having an ingrowth peak, said first contact surface of said load bearing member extending out of said cavity past said ingrowth peak.

10. The orthopaedic implant according to claim 1, wherein said load bearing member substantially fills said cavity.

11. The orthopaedic implant according to claim 1, wherein said first contact surface is a planar surface.

12. The orthopaedic implant according to claim 1, wherein said implant body comprises at least one of PEEK, reinforced PEEK, titanium, stainless steel, cobalt chrome, and ultra-high molecular weight polyethylene.

13. An orthopaedic implant, comprising:

an implant body having a first surface, a second surface opposite said first surface, and a cavity formed therein that extends through said first surface and said second surface, said implant body being substantially non-porous; and

a load bearing member comprising a substantially porous material held within said cavity, said load bearing member having a first contact surface extending out of said cavity and being proud of a portion of said first surface, said load bearing member having a second contact surface opposite said first contact surface, said load bearing member having interconnecting pores extending from said first contact surface to said second contact surface, said load bearing member having a total volume and said interconnecting pores in aggregate occupying at least 60% of said total volume.