Spinous process fixation devices and methods of use

摘要

Devices and methods for the treatment of abnormal spinal stability and stenosis of the spinal canal by the implantation of orthopedic devices between skeletal segments. In one embodiment, a device is disclosed to rigidly fixate the spinous processes of two vertebral bones relative one another. A first member of the device is advanced across an interspinous space, rotated, and/or advanced onto the contralateral side of the spinous processes. A second member of the device is also advanced onto the ipsilateral side of the spinous processes and forcibly captures the spinous processes between the first and second members. A protrusion extends from the first and/or second devices configured to embed into the bone of the spinous processes thereby increasing the immobilization strength of the device. The implant may be further configured to contain a bone forming material to form a fusion between the first and the second vertebral bones.

主权项

1. A method for bony fusion of a spinal segment comprising a superior vertebral bone, an immediately adjacent inferior vertebral bone and an intervening intervertebral disc space, comprising:
identifying the spinal segment on an imaging modality; advancing a first orthopedic device into the intervertebral disc space using a first corridor that extends through a psoas muscle on a lateral side surface of the intervertebral disc space; positioning the first orthopedic device within the intervertebral disc space through the first corridor; advancing a second orthopedic device onto a lateral aspect of an interspinous space that is positioned between a spinous process of each of the superior and the inferior vertebral bones; positioning an interspinous space implant at least partially within the interspinous space, the interspinous space implant comprising:
an elongated body that extends from a proximal end to a distal end, the body having a first surface that is configured to abut an inferior surface of the spinous process of the superior vertebral bone and a second surface that is configured to abut a superior surface of the inferior spinous process of the inferior vertebral bone, the surfaces being joined by an interconnecting wall and separated by a cavity that is configured to house a bone forming material, and to permit the formation of a bone fusion therethrough; and a first bone abutment member that is coupled to a distal segment of the elongated body and a second bone abutment member that is coupled to a proximal segment of the elongated body, the first bone abutment member configured to movably rotate relative to the elongated body; and actuating a locking feature to advance the first and the second bone abutment members towards one another and to forcibly immobilize the spinous process of each of the superior and inferior vertebral bones therebetween.