Patent ID: 8141608
Filing Date: 2012-03-27
Classification: B29C

Abstract:
1. Apparatus for manufacturing extruded coiled tubes for medical purposes comprising: a plurality of rotary shafts protruding from a spindle, each rotary shaft being coupled to a respective flexible shaft resting on a series of supporting elements substantially equidistant to each other and supported by a main central shaft; a first extrusion head to extrude a ribbon, and a second extrusion head to extrude a rib; said ribbon and said rib being co-extruded, side by side, and being wound on an ideal surface formed by external surfaces of the flexible shafts; wherein the rib is wound on a base tubular element, formed, on its turn, by the winding coil of the ribbon; and external mechanical means to rotate said series of supporting elements with a pre-defined angle for changing a winding angle of the flexible shafts around said main central shaft such that a pitch of the apparatus is changed.