| 摘要 |
A composite continuously electrostatically spun synthetic vascular graft has a central graft portion having a first polymeric microfibrous structure (30) and end graft portions having a second microfibrous structure (31) including fibres of different diameter, transition between the first and second fibrous structure being sufficiently gradual to avoid sudden flexibility changes in the grafts between the central portions and the end portions. The graft is spun on a mandrel (10) by creating a central electrostatic field for creating the first fibrous structure and end fields surrounding end portions of the mandrel for creating the second fibrous structure, together with transitional fields between the centre and end fields to create the gradual change between the centre and end fields. |
