Patent ID: 8070733

Claim:
A device for regulating the flow rate of a medical liquid directed towards a patient, comprising: a seal element presenting a continuous annular first recess; a body provided with elements connected to conduits for connecting respectively to a reservoir of said liquid and to the patient, said elements associated with corresponding parts connected together but torsionally free, said corresponding parts comprising at least a first part and a second part, at least the second part comprising at least one second recess of variable size for regulating flow to modify the flow rate of said liquid directed towards the patient by rotating said parts about a common axis of rotation, the second part provided with the second recess comprising an aperture in its flat portion, through said aperture there passing a connection element for the first part, to cooperate with a counter-element on said second part provided with the second recess, between said first and second parts there being said seal element which enables fluid to pass, via communication means, from the first part of the device body to the second part of the device body via said at least one second recess for said flow rate regulation, transverse liquid sealing means between said seal element and at least the second part, provided with the at least one second recess, of said interconnected parts, said transverse sealing means for preventing the escape of liquid from said second recess and from the body of the device following a relative movement between said first and second parts in a plane perpendicular to said axis of rotation or along this axis during flow regulation or following any angular misalignment of said first and second parts relative to said axis, said transverse seal means comprising a continuous first rim rising from said seal element, said first rim being more external than the second recess with reference to the axis of rotation which coincides with the longitudinal axis of said body, the second part of the body provided with the second recess presenting the continuous first recess to receive the projecting continuous first rim, wherein the seal element is a single one sealing element; and said transverse seal means comprises a second annular rim projecting from said seal element, said second rim being disposed more internal than the second recess of said second part with reference to the longitudinal axis of the device body, said second annular rim and the more external first rim embracing each recess provided in the face of the flat portion of said second part, wherein said second rim cooperates with a corresponding third recess provided in said second part provided with the second recess, said second rim and the corresponding third recess being so provided to obtain a fluid seal close to the above-cited axis of rotation, each projecting rim cooperating substantially as a form fit to seat with the corresponding recess.