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1. WO1996016608 - VERTEBRAL INSTRUMENTATION ROD

Publication Number WO/1996/016608
Publication Date 06.06.1996
International Application No. PCT/IB1995/001069
International Filing Date 28.11.1995
Chapter 2 Demand Filed 26.06.1996
IPC
A61B 17/70 2006.01
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
17Surgical instruments, devices or methods, e.g. tourniquets
56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
58for osteosynthesis, e.g. bone plates, screws or the like
68Internal fixation devices
70Spinal positioners or stabilisers
CPC
A61B 17/7055
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
17Surgical instruments, devices or methods, e.g. tourniquets
56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
58for osteosynthesis, e.g. bone plates, screws, ; setting implements; or the like
68Internal fixation devices ; , including fasteners and spinal fixators, even if a part thereof projects from the skin
70Spinal positioners or stabilisers ; ; Bone stabilisers comprising fluid filler in an implant
7055connected to sacrum, pelvis or skull
Applicants
  • SOFAMOR, S.N.C. [FR]/[FR]
Inventors
  • GAYET, Louis, Etienne
  • RIDEAU, Yves
Agents
  • MARTIN, Jean-Paul
Priority Data
08/346,90230.11.1994US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) VERTEBRAL INSTRUMENTATION ROD
(FR) INSTRUMENT POUR LA COLONNE VERTEBRALE, SE PRESENTANT SOUS FORME DE TIGE
Abstract
(EN)
This rod comprises a first cylindrical part, being a lumbosacral part (6), which is rigid in all directions, a second part, being a dorsal part (7), which is rigid in a frontal plane, in order to prevent scoliosis, and flexible in a sagittal plane, and a dorsolumbar transition zone (8) connecting the lumbar and dorsal parts and profiled in a progressive manner so that its thickness in the sagittal plane diminishes progressively and its width in the frontal plane increases progressively: this profile is such that the second moment of area of the transition zone remains substantially constant over its entire length. The profile, thus defined, of the transition zone has the aim of avoiding, to a great extent, the risks of breaking due to the fatigue in this zone, resulting from the various movements of the patient in a chair, in particular the flexion/extension movements in a sagittal plane, promoted by the rectangular profile of the dorsal part of the rod.
(FR)
Cette tige comporte une première partie cylindrique appelée partie lobosacrée (6) qui est rigide dans tous les sens, une seconde partie appelée partie dorsale (7) qui est rigide dans le plan frontal de manière à empêcher la scoliose et souple dans le plan sagittal, et une zone de transition dorso-lombaire (8) reliant les parties lombaire et dorsale et profilée de manière progressive de sorte que son épaisseur dans le plan sagittal diminue progressivement et que sa largeur dans le plan frontal augmente progressivement. Ce profil est conçu de sorte que le moment d'inertie de la zone de transition reste sensiblement constant sur toute sa longueur. Le profil ainsi défini de la zone de transition permet d'éviter, en grande partie, les risques de rupture dus à la fatigue dans cette zone, résultant de divers mouvements du patient dans une chaise, en particulier de mouvements de flexion/extension dans un plan sagittal, grâce au profil rectangulaire de la partie dorsale de la tige.
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