Automatic injection and retraction syringe

A - Human Necessities – 61 – M

Patent

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A61M 5/00 (2006.01)

Patent

CA 2591278

An automatic injection and retraction syringe having a medicine cartridge, an injection assembly, and a retraction assembly is provided. The retraction assembly is selectively securable to the injection assembly to house the medicine cartridge. The retraction assembly includes an end cap, a hypodermic needle, a retraction spring, and an upper seal. The retraction spring is maintained in a partially compressed condition between the needle hub and the end cap. The upper seal is urged against a sealing surface by the retraction spring in the partially compressed condition to form a hermetic seal. In some embodiments, the injection assembly includes an injection spring, a plunger engaged to the injection spring, and a safety element to prevent the plunger from escaping the injection assembly if the injection spring is released from the normally stressed condition before the assemblies are secured to one another.

L'invention concerne une seringue à injection et à rétraction automatique comprenant une cartouche de médicament, un ensemble d'injection et un ensemble de rétraction. L'ensemble de rétraction peut être fixé sélectivement sur l'ensemble d'injection, la cartouche de médicament est logée dans l'ensemble de rétraction. L'ensemble de rétraction comprend un capuchon terminal, une aiguille hypodermique, un ressort de rappel, et un joint d'étanchéité supérieur. Le ressort de rappel est maintenu dans une position partiellement comprimée entre l'embase de l'aiguille et le capuchon terminal. Le joint d'étanchéité supérieur est pressé contre une surface d'étanchéité par le ressort de rappel dans sa position partiellement comprimée, de manière à former une fermeture hermétique. Dans certaines formes de réalisation, l'ensemble d'injection comprend un ressort d'injection, un piston inséré dans le ressort d'injection, et un élément de sécurité empêchant le piston de sortir de l'ensemble d'injection au cas où le ressort serait libéré de sa position de contrainte normale avant que les ensembles d'injection et de rétraction ne soient assemblés.

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