Women with Polycystic ovary syndrome (PCOS) experience multiple fertility treatments, a long treatment duration and a low pregnancy prevalence. This syndrome is frequently accompanied by overweight and insulin resistance which can mediate the limited response to fertility treatment. The Endobarrier device was shown to be efficient in weight and glucose lowering. The aim of this study is to investigate the ability of the Endobarrier device to improve the outcome of fertility treatments in women with PCOS.