Spondylolisthesis reduction system

摘要

A system for reducing deformities in the spine includes a first tower assembly and a second tower assembly. The first tower assembly includes a first tower that couples to a first screw in a first vertebral level, a load transfer ring rotatable coupled to the first tower, and a load transfer link rotatably coupled to the load transfer ring. The second tower assembly includes a second tower that couples to a second screw in a second vertebral level, a load applicator secured to the second tower, and a load transfer member rotatably coupled to the second tower and linked to the load transfer link. The load applicator applies force to the load transfer member to position the first tower assembly relative to the second tower assembly.

主权项

1. A system for reducing deformities in the spine, comprising:
a first tower assembly including a first mount and a second tower assembly including a second mount, wherein the first mount is operably coupled to the proximal end of the first tower assembly, and the second mount is operably coupled to the proximal end of the second tower assembly; a load reduction arm including a central shaft, and the load reduction arm operably coupled to the first mount and translatable with the second mount to transmit a leverage and cause relative movement of the first tower assembly from the second tower assembly from an unreduced state into a reduced state, wherein the second mount includes a reduction drive shaft that is operably coupled with a drive shaft bore mounted on the proximal end of the second mount, wherein the reduction drive shaft includes a substantially threaded portion along the exterior of the reduction drive shaft to operably couple with a threaded portion along the interior of the drive shaft bore, wherein the first end of the load reduction arm is rotatably coupled to the distal end of the first mount, and the central shaft of the load reduction arm is operably coupled to the reduction drive shaft, such that distal movement of the reduction drive shaft causes the first end of the load reduction arm to move upwards and the first mount to move along its vertical axis into the reduced state, wherein the first mount includes a load transfer ring on the proximal end of the first mount to secure the first mount to the first tower assembly, and the second mount includes a load transfer ring for securing the second mount on the proximal end of the second tower assembly, wherein the distal end of the reduction drive shaft operably engages a distraction slide lock on the distal end of the second mount, the first end of the distraction slide lock is rotatably coupled with the distal end of the second mount, whereby the second end of the distraction slide lock is rotated by the advancement of the reduction drive shaft, wherein the distraction slide lock includes a distraction trigger operably coupled on the second end of the distraction slide lock, wherein the distraction trigger includes a locking feature as to lock the distraction slide lock with the central shaft of the load reduction arm.