DEPLOYMENT TOOL FOR DISTAL BONE ANCHORS WITH SECONDARY COMPRESSION

• US 20080108996A1
• Filed: 01/10/2008
• Published: 05/08/2008
• Est. Priority Date: 08/23/2001
• Status: Abandoned Application

• Current Assignee: Interventional Spine, Inc (Johnson & Johnson)
• Original Assignee: Interventional Spine, Inc (Johnson & Johnson)
• Inventors: Padget, Martin, Culbert, Brad
• Application Number:
  US11/972,493
• Publication Number:
  US 20080108996A1
• Time in Patent Office: Days
• US Class Current: 606/67
• 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
• CPC Class Codes: A61B 17/88 Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices A61B17/7074 takes precedence
• CPC Class Codes: A61B 17/8863 Apparatus for shaping or cutting osteosynthesis equipment by medical personnel
• CPC Class Codes: A61B 17/8869 Tensioning devices
• 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 17/8875 Screwdrivers, spanners or wrenches
• CPC Class Codes: A61B 17/8883 the driver bit acting on the periphery of the screw head
• CPC Class Codes: A61B 17/8891 at its periphery
• CPC Class Codes: A61B 2017/00734 battery operated

Abstract

Deployment systems for deploying a bone fixation device are disclosed herein. One embodiment of a deployment system includes a syringe-shaped body configured to provide proximal traction to a bone fixation device in response to a compressive force between a finger grip and a plunger adapted to be engaged by the heel of a clinician'"'"'s hand. The device may include a collet for gripping a proximal pin of a fixation device. The deployment device may also include a tool that includes an elongate body with a distal tip adapted to rotationally engage a bone fixation device in order to axially rotate the fixation device. A further deployment device embodiment includes a cauterizing tip for heat-cutting an excess portion of a pin of a bone fixation device.

Claims

1. A method of securing a first bone fragment to a second bone fragment, comprising the steps of:

forming a bore through the first bone fragment in the direction of the second bone fragment;

advancing a fixation device comprising an elongate body, having a proximal end and a distal end, a helical anchor on the distal end of the elongate body and a proximal anchor, moveably carried by the elongate body, the elongate body and the proximal anchor having complementary retention structures configured to resist proximal movement of the proximal anchor with respect to the elongate body;

rotating the fixation device to engage bone in the second bone fragment; and

using a deployment device to apply a distal force to proximally withdraw the elongate body with respect to the proximal anchor.

2. A method of securing a first bone fragment to a second bone fragment as in claim 1, wherein the second bone fragment comprises the head of a femur.

3. A method of securing a first bone fragment to a second bone fragment as in claim 1, wherein the step of rotating the fixation device comprises engaging the proximal anchor of the fixation device with the deployment and rotating the deployment device to rotate the proximal anchor and the distal anchor.

4. A method of securing a first bone fragment to a second bone fragment as in claim 1, wherein the step of using a deployment device to proximally withdraw the elongate body with respect to the proximal anchor comprises moving the fingers of a hand that is holding the deployment device towards the palm of the hand that is holding the deployment device.

5. A method of securing a first bone fragment to a second bone fragment as in claim 1, wherein the step of using a deployment device to proximally withdraw the elongate body comprises gripping the elongate body of the fixation device with the deployment device.

6. A method of securing a first bone fragment to a second bone fragment as in claim 5, wherein the step of gripping the elongate body of the fixation device with the deployment device comprises proximally withdrawing a collet within the deployment device.

7. A method of securing a first bone fragment to a second bone fragment as in claim 1, further comprising separating the elongate body into a first portion that remains coupled to the proximal anchor and a second portion that is removed from the fixation device.

8. A method of securing a first bone fragment to a second bone fragment as in claim 7, wherein the step of separating the elongate body comprises rotating the second portion with respect to the first portion.

9. A method of securing a first bone fragment to a second bone fragment as in claim 7, wherein the step of separating the elongate body comprises cutting the elongate body with the deployment device.

10. A method of securing a first bone fragment to a second bone fragment as in claim 9, wherein the step of separating the elongate pin comprises heating.