 The Materna device aims to prevent pelvic tissue damage by preventing overstretching of pelvic floor muscle fibers during delivery. The device is a single use, disposable, mechanical dilator that penetrates the first 4 cm or 12 of the vaginal canal and gradually expands the vagina from a resting diameter of 2-3 cm to the fully expanded size of a delivering fetus, roughly 8-10 cm. The Materna device will be used during the first stage of labor, for roughly 1-2 hours, in a hospital Labor and Delivery unit, under the supervision of trained clinical labor and delivery providers 