Pre-filled retractable needle injection devices

A - Human Necessities – 61 – M

Patent

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Details

A61M 5/00 (2006.01) A61M 5/24 (2006.01) A61M 5/32 (2006.01) A61M 5/315 (2006.01) A61M 5/50 (2006.01)

Patent

CA 2264532

A pre-filled injection device having a retractable needle (25) with a sharpened tip for penetrating the skin of a patient for administering medicinal fluids is provided. The pre-filled injection device of the present invention allows the needle to be manually retracted, thereby reducing the risk of transmission of various pathogens, most notably human immune virus (HIV), to uninfected personnel, due to an inadvertent prick. The present pre-filled injection device has a hollow housing (7) which receives a pre-filled cartridge (1) containing medicinal fluids. A needle retainer (22) initially-holds a needle (25) projecting forward from the hollowing housing (7). The rear end (27) of the needle (25) pierces the pre-filled cartridge (1) when sufficient pressure is applied to the end (27) of the pre-filled cartridge (1) to advance it in the forward direction. A plunger (35) is slidably displaceable within the hollow housing (7). A latch member (72) is operable in a latched position to prevent forward movement of the plunger (35). The latch member is operable in an unlatched position to permit forward movement of the plunger (35) and retract the needle (25) into the hollow housing.

Dispositif d'injection prérempli doté d'une aiguille rétractable (25) à bout pointu, destinée à pénétrer dans la peau d'un patient pour administrer des fluides médicinaux. Ledit dispositif permet le retrait manuel de l'aiguille, ce qui réduit le risque de transmission de divers agents pathogènes, surtout le virus de l'immunodéficience humaine (VIH), à des personnes non infectées, dû à une piqûre par inadvertance. Ledit dispositif comporte un logement creux (7) destiné à recevoir une cartouche préremplie (1) contenant des fluides médicaux. Un mécanisme de retenue (22) d'aiguille retient initialement une aiguille (25) faisant saillie vers l'avant depuis le logement creux (7). L'extrémité arrière (27) de l'aiguille (25) perce la cartouche préremplie (1) lorsque l'on applique une pression suffisante sur l'extrémité (27) de ladite cartouche (1) pour la faire avancer dans la direction avant. Un piston (35) est placé coulissant à l'intérieur du logement creux (7). Un élément de blocage (72) peut être amené dans une position de blocage pour empêcher le mouvement vers l'avant du piston (35). L'élément de blocage peut être amené dans une position de déblocage qui permet le mouvement avant du piston (35) et le retrait de l'aiguille (25) dans le logement creux.

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