Needleless injection device with double stopper with low...

A - Human Necessities – 61 – M

Patent

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Details

A61M 5/30 (2006.01)

Patent

CA 2658108

The present invention relates to a needleless injection device (1) comprising a reservoir (3), obturated by an upstream stopper (4) and a downstream stopper (5) between which a liquid active principle (6) is accommodated, and a receptacle (7) comprising at least one injection conduit (8), said receptacle comprising a cavity (10) whose height is equal to the distance travelled by the downstream stopper before each injection conduit is opened, - the height of the cavity in millimetres being between a minimum height and a maximum height, respectively defined by the following relationships, ~ minimum height = 3, ~ maximum height = 15 x exp. (-(V/9)2) + 10, where V is the initial speed of ascent of the pressure profile expressed in bar per microsecond, - the ratio between the length of each injection conduit and the height of the cavity being between 1 and 2.

La présente invention se rapporte à un dispositif d'injection (1) sans aiguille comprenant un réservoir (3) obturé par un stoppeur amont (4) et un stoppeur aval (5) entre lesquels est logé un principe actif liquide (6), et un réceptacle (7) comprenant au moins un conduit d'injection (8), ledit réceptacle comprenant une cavité (10) dont la hauteur est égale à la distance parcourue par le stoppeur aval avant ouverture de chaque conduit d'injection, - la hauteur de la cavité en millimètres étant comprise entre une hauteur minimale et une hauteur maximale définies respectivement par les relations suivantes, ~ hauteur minimale = 3, ~ hauteur maximale = 15 x exp. (-(V/9)2) + 10, où V est la vitesse de montée initiale du profil de pression exprimée en bars par microseconde, - le rapport entre la longueur de chaque conduit d'injection et la hauteur de la cavité étant compris entre 1 et 2.

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