Patent ID: 7270667

Claim:
A device for the manual metering of a medical fluid comprising: a chamber for the fluid to be metered with an end opening, a gripping handle, a piston housed in said chamber and having an operating member for a user, and screw-type actuating means arranged in between said operating member and said piston so as to perform the longitudinal movement thereof and pressurize the fluid to be metered, said actuating means being changeable from a first configuration, where the piston is operable to be fed micrometrically, to a second configuration, where the piston is freely moveable in the chamber, said actuating means comprising an outer thread formed on the piston having a selected pitch, and a female-thread element formed integrally on said handle comprising a hollow cylindrical portion with an internal thread having a pitch corresponding to that of said outter thread and for engaging the thread on the piston, said handle comprising a substantially U-shaped unitary body with a first longitudinal end portion having a distal free end and a second longitudinal end portion adapted to be coupled to said chamber, and a second longitudinal end portion having distal free end carrying said female thread element and a proximal end, said first and second longitudinal end portions proximal ends being integrally connected end to end by a resilient member, said member being elastically deformable by means of transverse compression so as to move the actuating means between the first configuration and the second configuration, such that the outer thread and the female thread element engage when the handle is released and separated from one another when the handle is compressed.