This work aims at designing a prototype of a prostate phantom and at creating a 3D geometric model of the organs of the pelvic region. This investigation is part of the preclinical study of a treatment of bleeding after transurethral resection of a prostate (TURP). The prototype of this transparent prostate phantom was made with the combination of two materials: a RTV (Room Temperature Vulcanization) silicone and a two-component PDMS (polydimethylsiloxane). Bleeding in the area of prostate resection was represented. The biomechanical model geometry is based on the geometry of the pelvic organs generated from MRI (magnetic resonance imaging) images. The shape of the pelvic organs and the kinematic boundary conditions have helped to establish the relevance of the geometric model.