Abstract: A method for forming extruded microtube devices and products having a hollow portion utilizing a hydrodynamic nozzle, a curable fluid, and a core fluid to form flexible polymer based microtubes having an inner diameter ranging from 500 nanometers to 500 micrometers and also continuous microtubes having a varying inner diameter ranging from about 500 nanometers to 500 micrometers. The outer diameter can be variable and have a cross-sectional shape that is circular, rectangular, square, triangular, elliptical, star, irregular, curved, or formed within a solid block of material.

Abstract: A method and apparatus for forming extruded shapes having at least a hollow portion using a hydrodynamic nozzle, a curable fluid, and a core fluid.

Abstract: A curable sheath fluid and a core fluid are simultaneously introduced from a hydrodynamic nozzle to form a co-flowing extrusion, depositing at least a portion of the co-flowing extrusion on a material bed, and causing relative motion between the hydrodynamic nozzle and the material bed to form an extruded shape. The method comprises curing part or all of the external curable fluid. The method may introduce co-flowing extrusion to pressure to remove the internal core fluid from the external curable fluid, and may receive the core fluid into the fluid drain system. The extruded shapes may form a tube or plurality of tubes in a bundle or porous substrate. The ability to form concentric tubes and complex shapes provides a means forming high strength materials controlled release materials, and self-repair materials.

Abstract: A method and apparatus for forming extruded shapes having at least a hollow portion using a hydrodynamic nozzle, a curable fluid, and a core fluid.