Needleless injectors

A - Human Necessities – 61 – M

Patent

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Details

A61M 5/30 (2006.01) A61M 5/20 (2006.01) A61M 5/315 (2006.01) A61M 5/31 (2006.01)

Patent

CA 2340883

A pressurised gas powered actuator comprising a piston (3) operating in a cylinder (1). The stroke of the piston (3) may be reduced by uncovering one or more holes (14, 20) in the cylinder wall to permit the escape of the pressurised gas at a predetermined position along the swept wall of the cylinder. Alternatively, the piston (401) may be connected to a rod (402) which has a gas vent (406) formed therein, the position of the rod (402) with respect to the piston (401) being variable to adjust the stroke of the piston (401).

La présente invention concerne un actionneur à gaz pressurisé constitué d'un piston (3) qui se déplace dans un cylindre (1). La course du piston (3) peut être réduite par mise à jour d'un ou plusieurs orifices (14, 20) pratiqués dans la paroi du cylindre permettant l'échappement du gaz pressurisé à une position prédéterminée, située le long de la paroi du cylindre. Dans une autre réalisation, le piston (401), relié à une tige (402), présente, pratiqué à l'intérieur, un dispositif d'évacuation de gaz (406); la position de la tige (402), variable par rapport au piston (401), permet d'ajuster la course du piston (401).

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