Bone fixation device

• US 7,608,098 B1
• Filed: 11/09/2004
• Issued: 10/27/2009
• Est. Priority Date: 11/09/2004
• Status: Active Grant

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Sports Medicine LLC (Zimmer Biomet Holdings, Inc.)
• Inventors: Stone, Kevin T, Meridew, Jason D, Kaiser, Ryan A
• Primary Examiner(s): RAMANA, ANURADHA
• Application Number:
  US10/984,624
• Time in Patent Office: 1,813 Days
• Field of Search: 606/151, 606/232, 606300- 30, 606/309, 623/11.11, 623 1311- 1314
• US Class Current: 606/304
• CPC Class Codes: A61B 17/0401 Suture anchors, buttons or pledgets, i.e. means for attaching sutures to bone, cartilage or soft tissue; Instruments for applying or removing suture anchors A61B17/0642 takes precedence; fixation devices for tendons or ligaments A61F2/0811
• CPC Class Codes: A61B 17/8875 Screwdrivers, spanners or wrenches
• CPC Class Codes: A61B 2017/044 with a threaded shaft, e.g. screws
• CPC Class Codes: A61B 2017/0445 cannulated, e.g. with a longitudinal through-hole for passage of an instrument
• CPC Class Codes: A61F 2/0805 Implements for inserting tendons or ligaments
• CPC Class Codes: A61F 2/0811 Fixation devices for tendons or ligaments
• CPC Class Codes: A61F 2002/0858 Fixation of tendon or ligament between anchor and bone, e.g. interference screws, wedges
• CPC Class Codes: A61F 2002/0882 Anchor in or on top of a bone tunnel, i.e. a hole running through the entire bone
• CPC Class Codes: A61F 2002/2839 Bone plugs or bone graft dowels

Abstract

A fixation device for securing tissue to a bone. The fixation device includes an anchor having a hollow body defining a longitudinal passage, and a plug configured to be received in at least a portion of the passage.

Claims

1. A fixation device for securing tissue to a bone, the fixation device comprising:

an implantable anchor having a body extending between a first end and a second end, the body having an outer surface with a cylindrical portion and a tapered tip portion the body being externally threaded from the first end to the second end, the threads having blunt edges, the cylindrical portion having a length and defining an inner longitudinal passage having an inner surface of a cruciate shape along the length of the cylindrical portion, the longitudinal passage including four inner longitudinal ribs; and

separate elongated plug having an outer surface of cruciate shape, the elongated plug including four outer longitudinal grooves, the elongated plug slidably receivable within and mateable with the inner longitudinal passage along the length of the externally threaded cylindrical portion, such that the inner longitudinal ribs of the longitudinal passage are received in the corresponding outer longitudinal grooves of the elongated plug, the elongated plug formed of a material promoting bone growth through the anchor.

2. The fixation device of claim 1, wherein the cylindrical portion has threads with a first pitch and the tapered tip portion has threads with a second pitch, the first pitch being different than the second pitch.

3. The fixation device of claim 2, wherein the first pitch is greater than the second pitch.

4. The fixation device of claim 1, wherein the plug comprises osteoinductive/osteoconductive material.

5. The fixation device of claim 1, wherein the plug is made of material selected from the group consisting of calcium phosphate, calcium sulfate, tricalcium phosphate, allograft bone, autograft bone and combinations thereof.

6. The fixation device of claim 1, wherein the anchor is made of biocompatible material.

7. The fixation device of claim 1 in combination with a driver.

8. The fixation device of claim 7, wherein the driver has a portion shaped for engaging and mating with the longitudinal passage of the anchor.

9. The fixation device of claim 8, wherein the driver is cannulated.

10. The fixation device of claim 1, wherein the cylindrical portion of the outer surface includes a plurality of apertures communicating with the longitudinal passage, the apertures formed between the threads of the cylindrical portion and between adjacent longitudinal ribs of the longitudinal passage.

11. The fixation device of claim 10, wherein the apertures are substantially parallel to the threads of the cylindrical portion and are confined therebetween.

12. The fixation device of claim 1, wherein the longitudinal grooves and the longitudinal ribs have curved mating surfaces.

13. A fixation device for securing tissue to a bone, the fixation device comprising:

an implantable anchor extending from a first end to a second end and having a cannulated body, the cannulated body having an outer surface with an externally threaded cylindrical portion and a tapered tip portion, the outer surface having threads with blunt edges, the threads extending from the first end to the second end, the externally threaded cylindrical portion having a length and defining an inner longitudinal passage having an inner surface of a cruciate shape alone the length of the inner longitudinal passage, the inner longitudinal passage including four inner longitudinal ribs, the externally threaded cylindrical portion of the outer surface including a plurality of apertures therethrough, the apertures communicating with the inner longitudinal passage, the apertures formed between the threads and between adjacent inner longitudinal ribs of the passage; and

separate elongated plug having an outer surface of cruciate shape, the elongated plug including four outer longitudinal grooves, the elongated plug slidably receivable within and mateable with the inner longitudinal passage along the length of the externally threaded cylindrical portion, such that the inner longitudinal ribs of the inner longitudinal passage are matingly received in the corresponding outer longitudinal grooves of the elongated plug, wherein the outer longitudinal grooves and the inner longitudinal ribs have curved mating surfaces, and the elongated plug is formed of calcium phosphate material for promoting bone growth through the anchor.