Tracheostomy dilator

Dilator tracheostomy (30) comprises a rod (31) with an inner conduit (32) open at both ends and extending from the side (33) facing the patient to the opposite side to the patient the stem (31), being configured a first thread (35) on the side (33) directed towards the patient, and tapering the rod (31) in its sectional area (36) with the first thread (35) formed in the stem towards its side (33) directed toward the patient, characterized in that the first thread (35) is configured as threaded automatic cutting, wherein the rod a second thread (39) adjacent the first thread (35), comprising the first thread (35) and the second thread (39) an outer surface (37) having low friction characteristics in contact with tissue, wherein the outer surface (37) a hydrophilic coating and / or a gel being wetted with slip.