不同聚丙烯网用于乳房下垂矫正的生物力学研究

Biomechanical research of different polypropylene meshes in breast ptosis correction

目的探讨4种不同的聚丙烯网片的生物力学性能，为真皮帽法乳房缩小术中内置式乳罩的选择提供依据。方法以实验用小型猪作动物模型，将4种不同的聚丙烯网埋置于腹部皮下，90d后采集标本，比较其生物力学性能。结果4种聚丙烯网在拉伸强度、应力一应变关系、应力松弛和蠕变4个方面显示出不同的生物力学特性，这显然与它们所采用的材料和编织结构不同有关。结论应力松弛和蠕变作为网片特殊的生物力学特性在维持术后乳房正常形态上有重要意义，在内置式乳罩的选择标准中占有重要的地位。Premilene Mesh LP作为新型的轻重量、小孔径网片，在生物力学性能上优于其他网片。

Objective To investigate the biomechanical properties of different polypropylene meshes, so as to select the proper mesh for breast ptosis correction as inner bra. Methods Mini-pigs were used as animal model. Four different polypropylene meshes were implanted subcutaneously at abdomen. 90 d later, the specimens were taken out for biomeehanical study. Results The tensile strength, stress, relaxation and creep of the four meshes were different. The material and the knitting of the four meshes were different. Conclusions The biomechanical properties of relaxation and creep are important in maintaining the postoperative breast figure. Premilene Mesh LP is a new and light polypropylene mesh with mini-pores. Its biomechincal properties are superior to the others.