a surgical device for endoscopic surgical procedures capable of preventing injuries to internal organs during insertion . the surgical device can include one or more of the following : at least one sharp bladed edge , a mechanical tissue protection device that includes a series of thin plastic guards sliding along the sides of the blade edges and having an angle between their edges smaller than that of the at least blade edge , one or more fixed conical deflectors to expand the cut tissue passage leaving the guards to contact tissue contact only at their tips , an insufflation passage configured to transport fluid into the body cavity during penetration , a locking system for the guards that prevents accidental reuse of the cutting features , and / or an ergonomic design which facilitates handling .