Currently,polypropylene( PP) synthetic mesh is a kind of common material used for pelvic floor's repairing and reconstruction.The repairing mesh is generally made with different hole shape and size.Porosity is one of the most important indicators of PP mesh.Two different-structure PP meshes are selected through adopting corresponding target density in the heat setting process for meshes owning different porosity.Then performance and structure of two kinds meshes with different porosity are tested.The results showed that: the increase of porosity leaded to the decreases of meshes' thickness,tensile strength and bursting strength.Meshes' bending stiffness was reduced and they became softer,but there was no significant change in suture pulling-out force, which maybe associated with the large aperture of PP meshes.
A series of random copolymers （PCLAs） were synthesized by ring-opening polymerization of D,L-lactide （LA） and ε-caprolactone （CL） with different molar ratios. PCLA based polyurethanes （PCLAUs） were obtained by chain-extending of PCLA and polytetramethylene ether （PTMEG） with hexamethylene diisocyanate （HDI）. All the PCLAUs exhibit good shape memory properties with high shape fixity ratios above 98% and shape recovery ratios above 82% in the first cycle and 91% in the second cycle. PCLAUs with less CL content show faster recovery speed and PCLAUs with more CL content show higher shape recovery ratio. The trigger temperature can be tuned or controlled around body temperature by adjusting the molar ratio of LA to CL. The PCLAUs have potential applications in implant biomedical devices, especially for minimally invasive deployable devices.
