| abstract |
An implantable rod or rod (310), which extends axially, to adjust a distance between two adjacent vertebral bodies (L4 / L5), in a spine, having said rod or rod (310), an elongated body comprising : - a first section (322), near a front end (312) of the bar or rod (310), having a first thread thread (330) to engage directly with a first vertebral body (L4); - a second section (320), near a rear end (314) of the bar or rod (310), which has a second thread thread (328), which has a second smaller diameter (341) and a second larger diameter (338), to engage directly with a second vertebral body (L5), which is located in a close way, relative to the first vertebral body (L4); - an intermediate section (336), which extends between the first section (322) and the second section (320), the intermediate section (336) being sized and configured to maintain the distance between the two vertebral bodies (L4, L5); - and at least one lateral opening (363), which extends through the body, in the intermediate section (336); wherein, a first larger diameter (340) of the first thread thread (330), is smaller than the second largest diameter (338) of the second thread thread (328); characterized by the fact that a first thread thread step (PD), in the first section (322), is thinner, relative to the second thread thread step (P p) in the second section (320) , so that the advance of the first section (322), distally, towards the inside of the first vertebral body (L4), by rotation, causes an increase in the distance, between the first and second vertebral bodies (L4, L5), being sized and configured, the intermediate section (336), to maintain the distance between the two vertebral bodies L4, L5. |