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首页> 外文期刊>Indian Journal of Fibre & Textile Research >Development and structural evaluation of poly(lactic acid) based knitted scaffold for human urinary bladder reconstruction
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Development and structural evaluation of poly(lactic acid) based knitted scaffold for human urinary bladder reconstruction

机译:用于人膀胱重建的聚乳酸基编织支架的开发和结构评价

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Knitted scaffolds of poly(lactic acid) (PLA) filament spun by dry-jct-wet technique have been developed for human urinary bladder reconstruction. Three different types of samples are prepared by varying the number of ply in the PLA yam. Flexural rigidity of PLA monofilament is found to be dependent on draw ratio. It decreases from 16.22×10~(-7) kg m~4 to 2.74×10~(-7) kg m~4 as the draw ratio increases from 2 to 10. The performance of the developed structures is evaluated by ball bursting technique on a tensile tester. It is observed that the knitted structure with 8 ply yarn has bursting strength of 53.7 kg with 2.5 cm extension. The cyclic loading of knitted structure has been carried out at the load half of the bursting loads. It is found that the structure gets permanently set after 5 cycles of loading. Porosity of the knitted fabric is determined by ratio of voids volume to that of the total volume of knitted fabric. The knitted structure with 8 ply yarn has 80% porosity. Pore size of the knitted structures is determined by optical microscope. The in vitro degradation of the PLA knittings at different pH (4.6, 7.4 and 8.0) has been carried out for a period of 20 weeks. The surface morphology was studied by scanning electron microscopy. A severe degradation of sample is observed at pH 4.6.
机译:已经开发了通过干胶干湿纺技术纺制的聚乳酸(PLA)细丝编织支架,用于人类膀胱重建。通过改变PLA纱线的层数可以制备三种不同类型的样品。发现PLA单丝的抗弯刚度取决于拉伸比。当拉伸比从2增加到10时,它从16.22×10〜(-7)kg m〜4降低到2.74×10〜(-7)kg m〜4。在拉伸测试仪上。观察到,具有8层纱线的针织结构的断裂强度为53.7kg,延伸长度为2.5cm。针织结构的循环载荷是在爆破载荷的一半载荷下进行的。发现该结构在5个加载周期后被永久固定。针织物的孔隙率取决于空隙体积与针织物总体积的比值。 8股纱线的针织结构具有80%的孔隙率。针织结构的孔径通过光学显微镜确定。 PLA编织物在不同pH(4.6、7.4和8.0)下的体外降解已经进行了20周。通过扫描电子显微镜研究了表面形态。在pH 4.6下观察到样品严重降解。

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