Infusion state detection system

An infusion state detection system comprising:

• a pump unit configured to deliver a liquid to a patient via an infusion line and an indwelling needle, the pump unit comprising a first pressure detector configured to detect a pressure in the infusion line at a location on a downstream side of the pump unit;
• a second pressure detector configured to be fixed to a body surface of the patient at a position proximate the indwelling needle and configured to detect a pressure inside the infusion line;
• and
• a determination processing unit configured to:
• when the pressure detected by the first pressure detector or the second pressure detector is at a predetermined pressure value or above, stop driving of the pump unit for a stop period,
• determine an infusion state on the basis of a value of the pressure in the infusion line detected by the first pressure detector and a value of the pressure in the infusion line detected by the second pressure detector during the stop period,
• determine that occlusion of the infusion line has occurred based on a difference between (i) a change in the value of the pressure in the infusion line detected by the first pressure detector and (ii) a change in the value of the pressure in the infusion line detected by the second pressure detector, and
• determine that leakage of the liquid to an outside of a living body lumen has occurred based on the value of the pressure in the infusion line detected by the second pressure detector.