Sacroiliac screw

Patent metadata

Field	Value
Publication number	US-10123825-B2
Application number	US-201815918459-A
Country	US
Kind code	B2
Filing date	Mar 12, 2018
Priority date	Feb 25, 2015
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

An improved joint fusion screw for transiliac fixation has a screw head and extending therefrom an elongate hollow shaft. The hollow shaft has an externally threaded end portion extending to a tip end and a non-externally threaded shank portion having a plurality of window openings. At or near the tip end is a start of a thread with a bone cutting flute. The bone cutting flute has a cutting edge on a circumferential exterior of the threaded tip to cut bone and directs the cut bone internally into a bone receiving opening in the hollow shaft directly in front of the cutting flute. The cutting edge lies at the start of the thread extending radially above the bone receiving opening at least partially overhanging the opening configured to cut bone.

First claim

What is claimed is:

1. A method of transiliac fixation comprises the steps of:
pre-drilling an opening in the sacrum and the ilium bones to be fixed with a pilot hole opening; and
inserting by rotating a threaded joint fixation screw with a hollow shaft and with one or more bone cutting threads and one or more cutting flutes, each cutting flute being at a start of a thread to direct bone fragments to a bone receiving opening and into the hollow shaft into the pre-drilled opening while cutting autograft bone fragments directed into the hollow shaft by threading the screw, wherein the hollow shaft has a bone receiving chamber extending to a plurality of openings further in the hollow shaft spaced above the threads along a smooth non-threaded shank portion of the screw and below a screw head and the step of threading of the screw directs the autograft bone fragments to the openings to enhance fusion.

2. The method of transiliac fixation of claim 1 wherein the screw has the aperture at a tip end and a driver cap at the screw head and the method further comprises the steps of:
inserting a guide wire to create a drill path;
inserting a cannulated drill over the guide wire to pre-drill the hole; and
inserting the screw onto the guide wire to direct the path for insertion into the bone.

3. The method of transiliac fixation of claim 1 wherein the step of inserting and threading the screw has the threads engage only the sacrum bone and the ilium bone is positioned onto the smooth non-threaded shank portion.

Assignees

• Amendia Inc

Inventors

• Whipple Dale
• Tillett Jason Hayes
• Keating John G
• Kimball Jon Potter
• Liebelt Ralph Arthur

Classifications

• A61B17/7055 Primary

  connected to sacrum, pelvis or skull · CPC title

• A61B17/864

  hollow, e.g. with socket or cannulated · CPC title

• A61B17/8635

  Tips of screws · CPC title

• A61B17/861

  specially shaped for gripping driver · CPC title

• A61B17/8615

  at the central region of the screw head · CPC title