Patent Number: 6,251,111

Title: Jack for pulling a vertebral anchor

Abstract: A device for pulling a vertebral anchor with a strain gauge in combination with a tension rod. The device has a cylindrical telescopic housing made of a first hollow cylinder received inside a second hollow cylinder such that the two hollow cylinders define a longitudinal passage from the proximal to the distal end of the cylindrical telescopic housing. The tension rod is slidably disposed within the longitudinal passageway and has a means mounted on or near its distal end to attach to a vertebral anchor (or bone screw). The first and second hollow cylinders are biased apart by a mechanical spring, which resides inside the second hollow cylinder. A means for moving said tension rod in a proximal direction with respect to said telescopic housing is then operatively attached to the housing, as well as, a strain gauge to directly measure the amount of tension placed on the tension rod when the device is in use.

Inventors: Barker; B. Thomas (Bartlett, TN), Zdeblick; Thomas (Middletown, WI)

Assignee: SDGI Holdings, Inc.

International Classification: A61B 17/70 (20060101); A61B 17/88 (20060101); A61B 19/00 (20060101); A61B 017/56 ()

Expiration Date: 06/26/2018