Patent ID: 6447480
Filing Date: 2002-09-10
Classification: A61M

Abstract:
An injection device comprising a syringe body (1, 3, 21), which delimits a chamber which is designed to be filled with a liquid, in particular a medicinal liquid, and a unit (25) for closing off the chamber and distributing the liquid, comprising an end piece for closing off the said chamber, which is firstly extended by a base, in which there is sealed a needle (41) which is covered by a protective cap (35), and secondly, which is perforated in the extension of the said needle by a duct (29, 30) for distribution of the liquid, the said unit (25) for closing off and distributing being mobile axially between a position known as the closing-off position, in which the distribution duct (29, 30) is isolated from the chamber of the syringe body (1, 3, 21), and a position known as the injection position, in which the said distribution duct communicates with the said chamber, wherein, in the said injection device:the unit (25) for closing off and distributing comprises an intermediate section (31), which is disposed between the closing-off end piece and the base, and is placed such as to extend in the extension of the syringe body (1, 3, 21); the syringe body (1, 3, 21) comprises a ring (6) which is provided with a front wall (11), in which there is provided an axial opening (12) for passage of the protective cap (35), and which delimits two inner compartments (18, 19) which are juxtaposed axially, each of which has a shape which is conjugated with the intermediate section (31) of the unit (25) for closing off and distributing, and can accommodate the said intermediate section, the said compartments being separated by axial stop units (17) which can permit axial displacement of the intermediate section (31) of one compartment (18,19) towards the other compartment (19, 18); the ring (6) and the intermediate (31) section comprise respectively inner and outer conjugated units (15, 16, 32, 33), for relative locking in rotation of the said ring and intermediate section; the protective cap (35) comprises an end section, which is designed to extend through the axial opening (12) in the front wall (11) of the ring (6), such as to cover the base and abut axially the intermediate section (31) of the unit for closing off and distributing (25); the end section of the protective cap (35), and the intermediate section (31) of the unit (25) for closing off and distributing have at the front, and opposite, conjugated profiles (34, 38) in the form of a cam, which can give rise to axial displacement of the unit (25) for closing off and distributing, from its closing-off position towards its injection position, during movement of rotation of the protective cap (35); and the protective cap (35) comprises outer units (36, 37) which are designed to abut axially the front wall (11) of the ring (6), in a position in which the said cap covers the base of the unit (25) for closing off and distributing.