Patent ID: 6923035

Claim:
An apparatus for modifying at least a portion of a conduit, comprising: a first plurality of rollers arranged in a first pattern around a first portion of a passageway, wherein the first plurality of rollers is configured to indent a conduit passing through the passageway to form ridges and grooves in the conduit; a second plurality of rollers arranged in a second pattern around a second portion of the passageway, wherein the second plurality of rollers is configured to engage the ridges formed by the first rollers and compress the ridges towards a central axis of the conduit; and wherein the first plurality of rollers and the second plurality of rollers are configured to modify the conduit such that a distance from a central axis of the conduit to an outermost surface of one of the ridges of the conduit or a distance from the central axis of the conduit to a bottom of one of the grooves of the conduit is substantially the same as a radius of an unmodified portion of the conduit.