Automatic drug injector

A - Human Necessities – 61 – M

Patent

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Details

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

Patent

CA 2181255

An injector comprising a tubular body (1), a drug container having a tubular wall (2), a plunger (3), a needle (5) and a plunger rod (4), and two springs (7, 10). The first spring (7) is compressed in engagement with a portion of the inner surface of the body (1) as well as a part (6) joined to the plunger rod (4) and biases the needle (5) towards its extended position. The second spring (10) acts in the opposite direction to the first spring (7) and is compressed in engagement with a portion of the inner surface of the injector body as well as a ring (8). The second spring (10) exerts a greater force than the first spring (7). A slidable ring (8) for moving the drug container in the retraction direction of the needle (5) may be locked by a movable abutment (16). Said part (6) engages the movable abutment (16) to release the second spring (10) and cause retraction of the needle.

Cet injecteur comporte: un corps tubulaire (1), un reservoir contenant le médicament, comprenant une paroi tubulaire (2), un piston (3), une aiguille (5) et une tige de piston (4), deux ressorts (7, 10). Le premier ressort (7) est comprimé en prenant appui sur une partie de la surface intérieure du corps (1) et sur une pièce (6) liée à la tige du piston (4). Il agit dans un sens de sortie de l'aiguille (5). Le second ressort (10) agit en sens inverse du premier ressort (7). Il est comprimé en prenant appui sur une partie de la surface intérieure du corps d'injecteur et sur une bague (8). La force exercée par ce second ressort (10) est supérieure à celle exercée par le premier ressort (7). Une bague (8) montée coulissante, susceptible d'entraîner le réservoir dans un sens de rétraction de l'aiguille (5), peut être bloquée par une butée mobile (16). La pièce (6) coopère avec la butée mobile (16), pour libérer le second ressort (10) et assurer la rétraction de l'aiguille.

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