ClinicalTrials.gov This study is designed to evaluate the safety and effectiveness of the Materna Prep Device in reducing pelvic muscle injuries during vaginal delivery. See Study Contemporary OB/GYN Patient-controlled expanding dilator for dyspareunia See Interview Vaginal Dilators: Issues and Answers See review International Society for the Study of Women’s Sexual Health See Article The Journal of Sexual Medicine PS-03-002 Milli (TM) - A Novel Patient Controlled Expanding Dilator See Journal