The present invention relates to a surgical device in which a penetrating tip or cutting edge(s) is kept, at all times, sufficiently distant from delicate tissues. This object is solved by a surgical device comprising a penetrator a cutting blade located at a distal end of said penetrator and having a cutting tip and a guard positioned within said penetrator, said guard being movable with respect to said blade, said guard being configured to selectively exposing said cutting blade wherein said guard has an apex such that an angle subscribed by the apex of the guard is smaller than an angle subscribed by said blade tip for progressively covering said blade during deployment of the penetrator.
