Patent ID: 7637287

Claim:
An anti-buckling device for insertion into a thin-walled bendable fluid duct, comprising: a plurality of ribs extending in a longitudinal direction of the anti-buckling device, the plurality of ribs having a height which varies in a transverse direction, the plurality of ribs having a maximum height near a center of the anti-buckling device, wherein spaces between adjacent ribs form grooves; wherein a cross-section of the anti-buckling device fills a cross-section of the duct in such a way that duct walls lie on the plurality of ribs at a buckling point but cannot penetrate into the grooves causing the grooves to remain open and permeable for fluids when the anti-buckling device is bent; wherein the fluids circulate through the grooves of the anti-buckling device and, if necessary, transmit pressure forces; and wherein an envelope of the anti-buckling device in at least a portion of a length of the anti-buckling device corresponds essentially to the cross-section of the duct at the buckling point.