Abstract: A 3D printing device includes a platform, an active rotating base, a passive rotating base, and a printing head. The platform includes a first and a second moving mechanism, and the second moving mechanism further includes a bracket. The second moving mechanism is moved on the first moving mechanism, and the bracket is moved on the second mechanism. A vessel-supporting rod sleeved with a vessel is disposed between an active rotating base and a passive rotating base, the vessel-supporting rod is rotated by a motor through the active rotating base, and the printing head connected to a third moving mechanism is disposed upon the vessel-supporting rod. The bracket is moved by the first moving mechanism and the second moving mechanism to keep a pitch remain fixed between the bracket and the printing head when the printing head is moved by the third moving mechanism to execute a printing step.

Abstract: A tube structure includes a tube body formed by polyurethane elastomer and a wire. The tube body includes an outer surface, a first end, and a second end opposite to the first end. The outer surface is connected to the first end and the second end and the outer surface is surrounded around by the wire to form a plurality of wire gaps. A first implanting section, a connecting section, and a second implanting section are sequentially disposed from the first end to the second end of the tube body. So the plurality of wire gaps respectively form with a first wire-surrounding density, a third wire-surrounding density, and a second wire-surrounding density at the first implanting section, the connecting section and the second implanting section, wherein the first wire-surrounding density is less than the third wire-surrounding density, and the second wire-surrounding density is also less than the third wire-surrounding density.

Abstract: A polymer fiber tubular structure includes a first pipe element, a second pipe element, and a coil winding structure, wherein the first pipe element includes an inner surface and an outer surface and is composed of silicon-containing polycarbonate type polyurethane elastomer, the second pipe element includes an inner surface and an outer surface and is composed of polycarbonate type polyurethane elastomer. The second pipe element is wrapped on the outer surface of the first pipe element such that the first pipe element and the second pipe element are concentric structures. The coil winding structure is provided for embedding into the outer surface of the first pipe element or into the outer surface of the second pipe element, thereby, the kinking of the polymer fiber tubular structure is to be reduced during use, and the thrombosis can be further avoided when the polymer fiber tubular is used for the human being.