The invention relates to a film tube implemented like a bag for enclosing a manually operated ultrasonic head (8) and the cable leads thereof, and wherein an adhesive surface (3) is provided for attaching the film tube on the ultrasonic head (8). According to the invention, a carrier (9) is provided for the adhesive surface (3), and the film tube comprises a sound opening (10) in the region of the adhesive surface (3), wherein the carrier (9) covers the sound opening (10) and is tightly connected to the film tube. A film tube is thus provided by means of the invention, preserving the ultrasonic head (8), in particular the sound surface thereof, as best as possible, and avoiding the use of a gel between the ultrasonic head (8) and the film tube. Frequent application and removal of the adhesive surface (3) also does not cause problems for the sound surface, because the adhesive surface (3) can be removed from the ultrasonic head (8) without leaving residue.
