A device for guiding a surgical instrument at a surgical site, comprising: at least one guide channel sized and fitted to slidingly accommodate a surgical instrument, said guide channel defining a guide longitudinal axis; and at least one guide support leg coupled to said guide and defining a support leg longitudinal axis, wherein an angle (a) of said guide longitudinal axis in respect to a surface of a surgical site is defined by at least one of (i) a length (L) of said support leg, and (ii) an angle (β) between said guide longitudinal axis and said support leg longitudinal axis.