Patent ID: 7517332

Claim:
A device for infusion of a liquid, comprising: an actuator for exerting an infusion force on the liquid to be infused; a first sensor for measuring at least a first parameter indicative of the infusion force; a second sensor for measuring a second parameter which is variable in accordance with the first parameter; a controller programmed to perform the following operations: determining at least two values of the first parameter, said first parameter being indicative of said infusion force, and determining at least one variation between said values of the first parameter, determining at least two values of the second parameter, said second parameter being indicative of a position of a mobile part of the actuator, and determining at least one variation between said values of the second parameter, said at least one variation of the second parameter is a displacement of the mobile part of the actuator, verifying whether said values of the first and second parameters are in a predetermined relation with a reference value, wherein the operation of verifying comprises verifying whether a ratio between the variation of the first parameter and said displacement exceeds a threshold value, and emitting a signal in consequence of the verification.