Patent ID: 6921389

Claim:
A device for regulating the flow rate of a liquid in a medical infusion line, which comprises: a body having connection elements for connection to a first and to a second conduit; the first conduit being connected to a container of said liquid and the second conduit being directed to a patient to whom the liquid is to be administered; the body comprising a first part, a second part, and a seal element interposed therebetween; said parts being connected together but torsionally independent of each other such that said parts are rotatable about a common axis of rotation enabling flow rate variation means, associated with the body, to modify the flow rate of the liquid fed to the patient; the flow rate variation means comprising a plurality of concentric recesses provided in the second part of said body; communication means being provided above said plurality of recesses and associated with the first part of said body to connect at least a first recess to a second recess; one recess chosen from said first recess and second recess being connected to the first conduit and the other of said first and second recess being connected to the second conduit; said first recess being annular and of constant depth and said second recess being in the form of a broken ring and of variable depth; the flow rate variation means being provided in the second part of the body connected to the second conduit; said communication means comprising a through hole provided within the seal element and a dead hole provided within that surface of said seal element which faces the flow rate variation means; said dead hole not going through to an opposite surface of said seal element; and said dead hole structured and arranged to connect in series the first and the second recesses in the second part of the body.