Composite material bone implant

• US 8,709,055 B2
• Filed: 01/18/2010
• Issued: 04/29/2014
• Est. Priority Date: 01/16/2009
• Status: Active Grant

• Current Assignee: CarboFix Orthopedics Ltd.
• Original Assignee: CarboFix Orthopedics Ltd.
• Inventors: Beyar, Mordechay, Globerman, Oren, Einav, Elad, Wachsler-Avrahami, Hila
• Primary Examiner(s): WOODALL, NICHOLAS W
• Application Number:
  US13/144,938
• Publication Number:
  US 20110282395A1
• Time in Patent Office: 1,562 Days
• Field of Search: 606/76, 606300-331, 411/901
• US Class Current: 606/301
• CPC Class Codes: A61B 17/1631 Special drive shafts, e.g. flexible shafts A61B17/1642, A61B17/164 take precedence
• CPC Class Codes: A61B 17/1725 for applying transverse screws or pins through intramedullary nails or pins
• CPC Class Codes: A61B 17/72 Intramedullary pins, nails or other devices A61B17/744 takes precedence
• CPC Class Codes: A61B 17/7208 Flexible pins, e.g. ENDER pins
• CPC Class Codes: A61B 17/7225 for bone compression
• CPC Class Codes: A61B 17/7233 with special means of locking the nail to the bone
• CPC Class Codes: A61B 17/7241 the nail having separate elements through which screws pass
• CPC Class Codes: A61B 17/744 the longitudinal elements coupled to an intramedullary nail
• CPC Class Codes: A61B 17/80 Cortical plates , i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
• CPC Class Codes: A61B 17/8052 immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded
• CPC Class Codes: A61B 17/8625 Shanks, i.e. parts contacting bone tissue
• CPC Class Codes: A61B 17/864 hollow, e.g. with socket or cannulated
• CPC Class Codes: A61B 17/866 Material or manufacture
• CPC Class Codes: A61B 17/8872 Instruments for putting said fixation devices against or away from the bone A61B17/7074, A61B17/808 take precedence
• CPC Class Codes: A61B 17/92 Impactors or extractors, e.g. for removing intramedullary devices insertion or extraction of artificial joints A61F2/4603
• CPC Class Codes: A61B 2017/00831 Material properties
• CPC Class Codes: A61B 2090/3966 Radiopaque markers visible in an X-ray image
• CPC Class Codes: A61B 90/39 Markers, e.g. radio-opaque or breast lesions markers

Abstract

A composite bone implant. In some embodiments, one or more features are provided, such as markers for passageways, axial engagement of bone screws, sliding support of bone screws and/or a cannulated channel for a guide wire.

Claims

1. A bone fixation screw comprising:

a composite core formed of a threaded, polymer body containing longitudinally extending reinforcing fibers; and

a metal exterior surface on the core to provide additional hardness to the screw;

wherein said metal exterior surface is thin enough so that it does not cause artifacts in CT or MRI images that would significantly interfere with visualization, having a thickness ranging between 0.02 and 0.1 mm; and

wherein said metal exterior surface is smooth.

2. A bone fixation screw according to claim 1, wherein the metal surface is titanium or a titanium alloy.

3. A bone fixation screw according to claim 1, wherein the metal surface is threaded with screw threads.

4. A bone fixation screw according to claim 3, wherein a portion of the composite core penetrates an inner surface of the metal threads.

5. A bone fixation screw according, to claim 3, wherein an interface between the composite core and the metal surface includes complementary projections and recesses.

6. A bone fixation screw according to claim 3, wherein the screw threads are oversized or mismatched in pitch relative to screw holes in a bone implant configured to receive the screws.

7. A bone fixation screw according to claim 1, wherein the material comprising the metal surface is crimped around proximal and/or distal ends of the composite core of the screw.

8. A bone fixation screw according to claim 1, wherein the metal surface adds strength to said screw.

9. A bone fixation screw according to claim 1, wherein said bone screw has a self-tapping tip.

10. A. bone fixation screw according to claim 9, wherein said self tapping tip is covered by said layer.

11. A bone fixation screw according to claim 1, wherein said screw is cannulated.

12. A bone fixation screw according to claim 1, comprising an implant which adds hardness to the screw.

13. A bone fixation screw according to claim 12, wherein said implant is embedded in the screw.

14. A bone fixation screw according to claim 1, wherein said body includes a material layer between said body and said metal layer.

15. A bone fixation screw according to claim 14, wherein said layer comprises a composite material with helically wound fibers at an angle of +−

45 degrees.

16. A bone fixation screw according to claim 1, wherein said metal layer is crimped on said screw.