Patent ID: 6892726

Claim:
A system for use in monitoring and controlling the administration of an agent to a patient, the system comprising: a controllable administration device ( 2 , 2 a ) adapted to affect a controllable parameter of the agent administered to the patient, the agent having a reference value in the atmosphere external of the system; a measuring device ( 5 , 5 a , 5 b ) adapted to measure a characteristic of the agent dependent on the controllable parameter and to provide a measuring value for operating the controllable administration device; an external measuring point for the measuring device, the external measuring point being outside the controllable administration device; a transmission ( 21 , 22 ) link between the external measuring point and the measuring device; a user interface ( 20 ) by which the controllable administration device can be controlled using set values; a control unit ( 7 , 7 a , 7 b ) adapted to control the controllable administration device on the basis of the measuring value and the set values; means for comparing the measuring value with the reference value; and the control unit being adapted to interrupt the control action of the controllable administration device when the measuring value attains the reference value of the agent.