Support device for the human vertebral column

US5468241A · kind A · utility

Assignee

• Howmedica Inc. · DE

Inventors

• Peter Metz-Stavenhagen · Frebershausen, DE
• Klaus Behrens · Rickling, DE

Key dates

• Filing date: Feb 10, 1994
• Grant date: Nov 21, 1995
• Expiry date: Feb 10, 2014

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B17/7038
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

Support device for the human vertebral column having an elongated dorsally implantable holding device, at least two pedicle screws which have a head and a threaded shank and the head of which is mounted on the holding device pivotally about an axis which extends approximately perpendicularly to the threaded shank axis whilst the threaded shank projects from the holding device, and a securing device for the fixing of the pedicle screws in the set angular position and at desired axial intervals from each other, wherein the holding device includes at least two separate preferably threaded bolts which cooperate with a preferably threaded sleeve and which at the head ends includes a clamping surface lying on the axis or axis-parallel, the head of the pedicle screws includes two approximately parallel clamping faces extending approximately parallel to the threaded shank axis and for each bolt a screw connection is provided which clampingly fixes with respect to each other in their position the clamping surfaces of bolts and pedicle screws or of two bolts.