The invention refers to a self-sustaining lumbar intervertebral space of interest, a biocompatible hard implant designed for neurosurgical treatment of spinal instability associated with poliomyelitis. The implant was inserted through a small incision in the skin of the spine, attached to the distraction end, and fixed to the fibers in the spinal intermediate that are embedded in the lumbar spine due to the shape of the Conica arrow. To get him in the last place in the interesting space,An implant system was also designed, which included the following components: screws, rods, locks, arms, guidance and distraction, disarmament and forcepsla invencion se refiere a un espaciador interespinoso lumbar autoestable, es un implante rigido, biocompatible, disenado para ser utilizado en el tratamiento neuroquirurgico de la inestabilidad vertebral asociada a espondilolistesis de la misma. Este implante se coloca por medio de una pequena incision cutanea paravertebral y al estar adherido al extremo del distractor es dejado implantado, fijo, entre las fibras del ligamento interespinoso de las vertebras comprometidas en la columna vertebral lumbar como consecuencia de su forma de flecha conica. Para colocarlo en su posicion definitiva en el espacio interespinoso, se ha disenado tambien un Sistema de Implantacion que consta de las siguientes partes: tornillo, barra, candado, brazo, guia y distractor, el desarmador y la pinza portatornillo
