A rectal drainage appliance is disclosed comprising a tubularelement having an inflatable balloon at a distal end for anchoring theappliance in therectum. The appliance includes one or more of: (i) first and second auxiliarylumens communicating with the inflatable balloon to provide independentinflationand pressure monitoring paths coupled to the balloon； (ii) a pressure stateindicator defined by a mechanical element configured to flip between first andsecondstates or shapes responsive to sensed pressure； and (iii) a collapsibleauxiliarylumen larger than the inflation lumen, and configured to permit admission ofirrigation fluid. The pressure state indicator may also be used in intestinaldrains.
