METHOD AND APPARATUS FOR BONE FIXATION WITH SECONDARY COMPRESSION

• US 20090069813A1
• Filed: 11/07/2008
• Published: 03/12/2009
• Est. Priority Date: 03/30/2001
• Status: Abandoned Application

• Current Assignee: Interventional Spine, Inc (Johnson & Johnson)
• Original Assignee: Interventional Spine, Inc (Johnson & Johnson)
• Inventors: Culbert, Brad S., von Hoffmann, Gerard, Cachia, Victor V.
• Application Number:
  US12/267,460
• Publication Number:
  US 20090069813A1
• Time in Patent Office: Days
• US Class Current: 606/65
• CPC Class Codes: A61B 17/68 Internal fixation devices , including fasteners and spinal fixators, even if a part thereof projects from the skin bone staples A61B17/0642
• CPC Class Codes: A61B 17/742 having one or more longitudinal elements oriented along or parallel to the axis of the neck
• CPC Class Codes: A61B 17/744 the longitudinal elements coupled to an intramedullary nail
• CPC Class Codes: A61B 17/746 the longitudinal elements coupled to a plate opposite the femoral head
• CPC Class Codes: A61B 17/8625 Shanks, i.e. parts contacting bone tissue
• CPC Class Codes: A61B 17/8685 comprising multiple separate parts
• CPC Class Codes: A61B 17/869 characterised by an open form, e.g. wire helix

Abstract

Disclosed is a fracture fixation device, for reducing and compressing fractures in a bone. The fixation device includes an elongate body comprising a first portion and a second portion that are detachably coupled to each other. The first portion defines a helical cancellous bone anchor and the second portion defines a distal end. An axially moveable proximal anchor is carried by the proximal end of the fixation device and is rotationally locked to the first portion. The device is rotated into position across the femoral neck and into the femoral head, and the proximal anchor is distally advanced to lock the device into place. The second portion is then detached from the first portion.

Claims

1. A femoral neck fracture fixation device, comprising:

an elongate body, having a proximal end and a distal end and comprising a first portion and a second portion that are detachably coupled to each other at a junction;

a helical anchor on the distal end;

a retention structure on the body, proximal to the anchor; and

an anti-rotational structure on the first portion of the body,

a proximal anchor, moveably carried by the body and comprising a tubular sleeve that in a first position extends distally past the junction between the first portion and the second portion,

wherein the proximal anchor is movable in the distal direction with respect to the body, the retention structure resists proximal movement of the proximal anchor with respect to the body and the anti-rotational structure prevents rotational movement of the first portion of the body with respect to the proximal anchor.

2. A femoral neck fracture fixation device as in claim 1, wherein the first retention structure comprises a series of ridges or grooves.

3. A femoral neck fracture fixation device as in claim 2, further comprising a second retention structure on the interior of the tubular sleeve for cooperating with the first retention structure on the body.

4. A femoral neck fracture fixation device as in claim 3, further comprising a transverse flange extending radially outwardly from the tubular sleeve.

5. A femoral neck fracture fixation device as in claim 4, wherein the flange is angularly moveable with respect to a longitudinal axis of the tubular sleeve.

6. A femoral neck fracture fixation device as in claim 1, further comprising a rotational coupling on the second portion of the body.

7. A femoral neck fracture fixation device as in claim 1, further comprising a rotational coupling on the proximal anchor.

8. A femoral neck fracture fixation device as in claim 1, further comprising a first threaded portion on a proximal portion of the first portion and a second threaded portion on a distal portion of the second portion, the first threaded portion and the second threaded portion configured to detachably couple the first and second portions to each other at a junction.

9. A bone fracture fixation device, comprising:

an elongate body, having a proximal end and a distal end and comprising a first portion and a second portion that are detachably coupled to each other at a junction;

a bone anchor on the distal end;

a proximal anchor, moveably carried by the body and comprising a tubular sleeve that in a first position extends distally past the junction between the first portion and the second portion,

complimentary surface structures in between the first portion of the body and the proximal anchor that permit advancing the proximal anchor in the distal direction to tighten the fixation device but that resist axial proximal movement of the proximal anchor and prevent rotational movement between the first portion and the proximal anchor.

10. A method of treating a femoral fracture, comprising the steps of:

drilling a bore distally into the femur in the direction of a fracture;

advancing into the bore a fixation device that comprises a body having a first portion that forms a cancellous bone anchor and a second portion that forms a proximal end;

rotating a proximal anchor of the fixation device so to engage the cancellous bone anchor with bone tissue distal of the femoral fracture; and

advancing the proximal anchor distally along the fixation device to compress the fracture.

11. A method of treating a femoral fracture as in claim 10, wherein the drilling step comprises drilling the bore along an axis which extends through the femoral neck and into the head of the femur.

12. A method of treating a femoral fracture as in claim 10, wherein the advancing step comprises advancing a fixation device wherein the cancellous bone anchor comprises a helical anchor and the first portion includes a plurality of retention structures proximal to the helical anchor for engaging the proximal anchor.

13. A method of treating a femoral fracture as in claim 10, wherein the advancing a proximal anchor step comprises axially advancing the proximal anchor without rotating the proximal anchor with respect to the fixation device.

14. A method of treating a femoral fracture as in claim 10, wherein the fracture is a femoral neck fracture, an intertrochanteric fracture or a subtrochanteric fracture.

15. A method of treating a femoral fracture as in claim 10, further comprising separating and removing the second portion from the first portion.

16. A method of treating a femoral fracture as in claim 15, wherein separating and removing the second portion from the first portion comprises rotating the second portion with respect to the first portion.