<prompt> Instrumental delivery system isForceps only used in full cervical dilationForceps used when ventouse failsVentouse cannot be used in rotational deliveries of occipito-posterior and transverse presentationsForceps can be used in breech deliveries  <response>: Ventouse - is an instrumental device designed to assist delivery by creating a vaccum between it and the fetal scalp. In case of failed ventouse, forceps may be used if 1. Head is almost completely rotated 2. Cervix is fully dilated 3. There is some degree of descent 