Mosaic implants, kits and methods for correcting bone defects

• US 10,076,416 B2
• Filed: 02/12/2014
• Issued: 09/18/2018
• Est. Priority Date: 02/12/2013
• Status: Active Grant

• Current Assignee: Ossdsign AB
• Original Assignee: Ossdsign AB
• Inventors: Engstrand, Thomas, Bohlin, Jan, Åberg, Jonas, Engqvist, Hakan
• Primary Examiner(s): Dukert, Brian
• Application Number:
  US14/767,253
• Publication Number:
  US 20150374497A1
• Time in Patent Office: 1,679 Days
• CPC Class Codes: A61B 17/688 for reattaching pieces of the skull
• 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: A61F 2/28 Bones joints A61F2/30
• CPC Class Codes: A61F 2/2846 Support means for bone substitute or for bone graft implants, e.g. membranes or plates for covering bone defects nets or sleeves applied to surface of endoprostheses A61F2/30907; bone plates A61B17/80; bone regeneration in dental surgery A61C8/0006
• CPC Class Codes: A61F 2/2875 Skull or cranium A61F2/2803 and A61F2/3099 take precedence
• CPC Class Codes: A61F 2/30965 Reinforcing the prosthesis by embedding particles or fibres during moulding or dipping
• CPC Class Codes: A61F 2002/30143 hexagonal
• CPC Class Codes: A61F 2002/30324 differing in thickness
• CPC Class Codes: A61F 2002/30451 soldered or brazed or welded
• CPC Class Codes: A61F 2002/30462 retained or tied with a rope, string, thread, wire or cable
• CPC Class Codes: A61F 2002/30578 having apertures, e.g. for receiving fixation screws
• CPC Class Codes: A61F 2002/3092 having an open-celled or open-pored structure
• CPC Class Codes: A61F 2002/30957 using a positive or a negative model, e.g. moulds
• CPC Class Codes: A61F 2002/3096 trimmed or cut to a customised size
• CPC Class Codes: A61F 2002/30985 using three dimensional printing [3DP]
• CPC Class Codes: A61F 2310/00353 Bone cement, e.g. polymethylmethacrylate or PMMA

Abstract

A mosaic implant conformable to a curved surface, comprising first and second implant sections coupled along a beam portion extending across a length of the implant, each of the implant sections having—a plurality of biocompatible mosaic plates, and—a plurality of wires which interconnect the plates with one another. The mosaic implant is configured to be deformable such that at least a portion of the mosaic implant is conformable to a curved surface, with the beam portion providing structural support which resists inward deformation of the curved portion of the implant. A kit for forming a mosaic implant is also provided, along with a method for correcting a bone defect in a patient.

Claims

1. A mosaic implant, comprising:

(a) a plurality of spaced-apart biocompatible mosaic plates, with a gap between adjacent plates; and

(b) a wire mesh interconnecting the plates with one another, said wire mesh comprising a plurality of wire segments and a plurality of eyelets enclosed within said plates, wherein the wire segments are connected to each other by said eyelets and extend between adjacent plates;

wherein at least a portion of said wire segments include deformation zones located in the gap between adjacent mosaic plates which facilitate deformation of the mosaic implant so as to reduce the risk of ceramic fracture upon bending of said wire mesh.

2. The mosaic implant of claim 1, wherein said deformation zones are chosen from the group consisting of:

reduced-thickness regions, reduced-width regions and pleated regions.

3. The mosaic implant of claim 2, wherein at least a portion of said deformation zones comprise pleated regions.

4. The mosaic implant of claim 3, wherein said pleated regions have a reduced width.

5. The mosaic implant of claim 2, wherein at least a portion of said deformation zones comprise reduced-thickness regions.

6. The mosaic implant of claim 2, wherein at least a portion of said deformation zones comprise reduced-width regions.

7. The mosaic implant of claim 2, wherein said deformation zones are located on each of the wire segments that interconnect adjacent plates.

8. The mosaic implant of claim 1, wherein said implant further comprises a plurality of fastening points which facilitate attachment of the mosaic implant in a patient.

9. The mosaic implant of claim 2, wherein said implant further comprises a plurality of exposed eyelets located about the periphery of the implant, said eyelets adapted to receive a fastener for securing the implant to bone.

10. The mosaic implant of claim 1, wherein at least a portion of the mosaic implant is conformed to a substantially spheroidal surface.

11. The mosaic implant of claim 1, wherein said biocompatible mosaic plates comprise a hydraulic cement composition.

12. The mosaic implant of claim 11, wherein said biocompatible mosaic plates comprise a cement comprising at least 55 wt. % monetite.

13. The mosaic implant of claim 1, wherein said implant includes a support frame comprising said wire mesh and a wire rim which extends about at least a portion of the periphery of the implant.

14. A mosaic implant for correcting a bone defect in a patient, comprising:

(a) a plurality of biocompatible mosaic plates;

(b) a support frame including a wire mesh interconnecting the plates with one another, the wire mesh comprising a plurality of wire segments interconnected by a plurality of eyelets enclosed within said plates;

wherein said support frame further comprises a wire rim extending about at least a portion of the periphery of the support frame and connected to a portion of said eyelets by wire struts.

15. The mosaic implant of claim 14, wherein the wire rim extends around the entire periphery of the support frame.

16. The mosaic implant of claim 15, wherein at least a portion of the wire rim is curved.

17. The mosaic implant of claim 16, wherein said plurality of plates include a central portion of plates having a hexagonal shape, and an outer portion of plates having an irregular pentagonal shape.

18. The mosaic implant of claim 17, wherein the outermost edges of the outer portion of plates are curvilinearly aligned with one another.

19. The mosaic implant of claim 14, wherein said eyelets are round.

20. The mosaic implant of claim 14, wherein said eyelets are hexagonal.

21. The mosaic implant of claim 15, wherein said eyelets are hexagonal.

22. The mosaic implant of claim 14, wherein said wire mesh includes deformation zones located between adjacent mosaic plates which facilitate deformation of the mosaic implant, said deformation zones chosen from the group consisting of:

reduced-thickness regions, reduced-width regions and pleated regions.