Abstract: The invention relates to an instrument for emergency treatment of i.a. respiratory obstruction in humans by percutaneous puncture of the trachea, the instrument comprising a body (2) having a through-passage (3) opening on one hand into a forward end (2c) of the body intended to be positioned against the neck of the patient, and on the other hand into a rear portion (2b) of the body a tube (6) coaxially provided in the passage in such a way that it protrudes from the forward end of the body and forms a continuation of the passage, the tube being intended to be introduced into the trachea of the patient, a stylet (7) retractably provided in the passage and/or in the tube (6) and adapted to protrude past the outer end of the tube (6) with its cutting point (7a) when in its fully inserted position.