Apparatus (58) is provided for coupling a cannula (59) to a face of a subject (24), the apparatus (58) comprising an adhesive pad (60) configured to adhere to a surface of the subjects face, and one or more cannula grips (62) rotatably coupled to the adhesive pad (60) and configured to couple the cannula (59) to the subjects face by gripping the cannula (59). Other embodiments are also described.
