A method comprises positioning a medical appliance having a primary pressure sensor (22) at or within a patient incision site and supplying an insufflation fluid to the patient cavity (20). The method further comprises measuring a pressure in the patient cavity by the primary pressure sensor and controlling the supply of insufflation fluid by an insufflator (10) to the patient cavity based at least on the measured pressure. The method further comprises determining, by a processor (42) associated with the insufflator, that the measured pressure may be inaccurate and, in response to determining that the measured pressure may be inaccurate, controlling, by the insufflator, the supply of the insufflation fluid to the patient cavity based at least on a pressure measured by a backup pressure sensor (26).
