Blade (200) of a laryngoscope, or similar devices, having a progressive spreading mechanism, said blade (200) characterized in that comprising:- a lower part (201), preferably rectangular, which extends along the longitudinal direction and having a profile that is curved at the end (204), in turn comprising: a first dividing wall (208) positioned transversely to said lower part (201), which extends longitudinally up to a specific distance, and having a series of primary protruding teeth (212a, 212b, 212c, etc.) positioned along one or more columns, and that regulate the transverse thickness- an upper part (202), preferably rectangular, which extends along the longitudinal direction and having a profile that is curved at the end (203), in turn comprising: a second dividing wall (209) positioned transversely to said upper part (202), which extends longitudinally up to a specific distance, and having a series of secondary protruding teeth (218a, 218b, 218c, etc.) positioned along one or more columns, that regulate the transverse thickness, and interlocking to said primary protruding teeth (212a, 212b, 212c, etc.)- a series of cylindrical elements (205a, 205b, 205c, etc.) that are all connected each other in correspondence of their axis, using a flexible articulated structure (206) free to move, under control of an operator, along the longitudinal direction, i.e. the main axis of the blade (200), inside an operative channel defined by a closed space between the above-mentioned lower part (201) and the upper part (202) of the blade (200),so that the sliding and rolling motion of said cylindrical elements (205a, 205b, 205c, etc.), inside the above-mentioned operative channel, cause the spreading by contact of the space between said end (204) of the lower part (201) in respect to said end (203) of the upper part (202) of the blade (200), with a consequent increase of thickness of the distal part of the same blade (200).
