An insulated pipe segment having a coating overtop of the otherwise exposed insulation layer in the cut-back region. Also, its method of manufacture, comprising spray coating the exposed insulation layer in the cut-back region with a thermoplastic powder, which is wetted. The coating for the exposed insulation layer may be made of a compatible, similar or identical but unfoamed thermoplastic as the insulation layer itself, which is typically foamed.

The present invention provides a preparation method of a material for a puncture-resistant artificial blood vessel. The artificial blood vessel prepared by the method comprises two layers: the dense outer layer and the electrospun inner layer, the structures of these two layers are combined tightly and are inseparable, so that the properties of blood oozing resistance and repeated puncture resistance required by the artificial blood vessel can be provided. The puncture-resistant artificial blood vessel provided by the present invention has excellent biocompatibility, blood compatibility and flexibility and has the functions of blood oozing resistance and repeated puncture resistance. The method provided by the present invention has the characteristics such as convenience in operation, simplicity in production process and liability to the realization of large scale.