An improved automatic syringe

A - Human Necessities – 61 – M

Patent

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Details

A61M 5/20 (2006.01) A61M 5/32 (2006.01) A61M 5/46 (2006.01)

Patent

CA 2308217

A syringe (10) comprises a barrel (11) containing an internal cylindrical body (12) containing a liquid (14) and communicating with a delivery needle (15). The needle (15) is covered before use by a removable sheath (16), and after the sheath (16) is removed, the needle (15) is concealed by a displaceable sleeve (20). In use the sleeve (20) is pressed against the skin by applying pressure while holding the barrel (11). The sleeve (20) is thereby retracted into the barrel (11) allowing the needle (15) to penetrate the skin. The movement of the sleeve (20) also activates a gas generator (17) which expels the liquid (14) from the needle (15). When delivery is complete and the syringe (10) is taken from the skin, a coil sprint (22) moves the sleeve (20) back to the starting position again concealing the needle (15). The coil spring (22) is torsionally biased before use and causes a rotational movement of the sleeve (20) relative to the barrel (11) when the sleeve (20) moves into and out of the barrel (11). This rotational movement engages a locking mechanism which prevents further movement of the sleeve (20) and thereby permanently conceals the needle (15).

L'invention concerne une seringue (10) qui comprend un cylindre (11) comportant un corps cylindrique intérieur (12) renfermant un liquide (14) et en communication avec une aiguille (15) d'injection. L'aiguille (15) est recouverte avant son utilisation d'une gaine détachable (16), et une fois la gaine (16) retirée, l'aiguille (15) est recouverte d'un manchon (20) amovible. On presse le manchon (20) contre la peau par pression tout en maintenant le cylindre (11). Le manchon (20) est de ce fait rétracté dans le cylindre (11) ce qui entraîne la pénétration cutanée de l'aiguille. Le mouvement du manchon (20) met en marche un générateur de gaz (17) qui expulse le liquide (14) de l'aiguille (15). Une fois l'administration effectuée et la seringue (10) retirée de la peau, un ressort hélicoïdal (22) remet le manchon (20) dans sa position initiale ce qui a pour effet de masquer à nouveau l'aiguille (15). Le ressort hélicoïdal (22) est sollicité par torsion avant son utilisation et provoque un mouvement rotatif du manchon (20) par rapport au cylindre (11) lors du mouvement de va-et-vient du manchon (20) dans le cylindre (11). Ce mouvement rotatif déclenche un mécanisme de verrouillage qui évite tout autre mouvement du manchon (20) et qui masque en permanence l'aiguille (15).

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