Retractable needle and syringe combination

A - Human Necessities – 61 – M

Patent

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Details

A61M 5/32 (2006.01) A61M 5/50 (2006.01)

Patent

CA 2409297

A combination hypodermic syringe and needle device in which the needle is retracted inside the syringe after completion of the injection. The device requires only one hand for operation wherein increasing the pressure on the plunger initiates an automatic retraction of the needle into the syringe. In operation, a collet is expanded and a spring biased needle retractor is engaged in response to the forward movement of a plunger. The forward end of the barrel carries a wedge which forces the collet to expand upon forward movement of the collet. A vent located in the plunger allows air to escape from the interior of the plunger as the needle assembly is retracted.

L'invention se rapporte à un dispositif combinant une seringue hypodermique et une aiguille, dans lequel l'aiguille se rétracte à l'intérieur de la seringue après la fin de l'injection. Ce dispositif peut être manipulé d'une seule main, l'accroissement de la pression appliquée sur le piston déclenchant un retrait automatique de l'aiguille à l'intérieur de la seringue. En cours de fonctionnement, une pince est déployée et un rétracteur d'aiguille sollicité par un ressort est actionné en réponse au mouvement vers l'avant de la pince. Un évent ménagé dans le piston permet à l'air de s'échapper de l'intérieur du piston lorsque l'ensemble à aiguille se rétracte.

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