Vascular grafts degree in Tianjin is different for each part

摘要

The blood vessel transplantation piece where extent of expansion differs every part has the poly- tetrafluoroethylene tube which was formed with cognate homogeneous material (12). The poly- tetrafluoroethylene tube includes the 1st part of the longitudinal direction which is expanded in longitudinal direction (14) with, the 2nd part of the longitudinal direction which is expanded in longitudinal direction (16) with. The 1st part and the 2nd part has had the microstructure which differs mutually respectively. As for the method of producing the blood vessel transplantation piece where extent of expansion of this invention differs every part, try to be able form the various plural expansion parts easily in the poly- tetrafluoroethylene tube. It includes with the processing which measures the quality of microstructure and the processing which does again to expand the poly- tetrafluoroethylene tube for the second time when quality is not approximate to reference level sufficiently to quality control mechanism. Selective figure Figure 1