FIELD: medicine.SUBSTANCE: group of inventions refers to medicine. According to the first version, a rectal drainage system comprises a tubular member, an insufflation bulb on a first distal end of the tubular element for rectal retention, a non-insufflation assisted lumen and a pressure sensor. The tubular element specifies the drainage passage for rectal excretion. The non-insufflation assisted lumen is connected with the insufflation bulb. The pressure sensor is attached to the assisted lumen to indicate the pressure level in the bulb when used in the rectum. The above pressure sensor comprises a first mechanical element having a three-dimensional deformable profile configured to switch over the first and second physical profiles depending on the fact if the sensed pressure is (i) a bulb insufflation pressure approaching a working level or (ii) a bulb insufflation pressure below the pre-set level. According to the second version, the rectal drainage system comprises the tubular member, the insufflation bulb on the first distal end of the tubular element for rectal retention, the first assisted lumen, the second assisted lumen and the pressure sensor. The tubular element specifies the drainage passage for rectal excretion. The first assisted lumen connected with the insufflation bulb for passing the insufflation fluid between the bulb and insufflation port for providing bulb insufflation and release. The second assisted lumen is connected for providing the direct pressure sensing in the bulb regardless of the dynamic pressure decay in the first lumen. The pressure sensor is attached to the second assisted lumen to indicate the pressure level visually in the bulb when used in the rectum. The above pressure sensor comprises the first mechanical element having the three-dimensional deformable profile configured to switch over the first and second physical profiles depending on the fact if the sensed pressure is (i) a bulb insufflation pressure approaching a working l
