Single-use pneumatic safety syringe with retractable needle

Details Single-use pneumatic safety syringe with retractable needle Single-use pneumatic safety syringe with retractable needle

A - Human Necessities

61

M

A61M 5/32 (2006.01) A61M 5/34 (2006.01) A61M 5/50 (2006.01)

Patent

CA 2580092

A pneumatic retractable syringe has a plunger having an interior retraction lumen. The plunger and syringe barrel have cooperating locking elements so that the plunger is locked after use within the syringe barrel. After injection of medicament is completed, the needle is retracted into the lumen by compressed gas that is released from a gas cell within the syringe when the gas cell is ruptured just before the plunger reaches the end of its downstream path of travel.

Cette invention a pour objet une seringue pneumatique rétractable dotée d'un piston muni d'une lumière de rétraction interne. Le piston et le corps de seringue possèdent des éléments de blocage fonctionnant en coopération de telle manière que le piston se bloque dans le corps de seringue après utilisation. Une fois l'injection du médicament terminée, l'aiguille est rétractée dans la lumière à l'aide d'un gaz comprimé libéré par une cellule à gaz dans la seringue lorsque cette cellule à gaz est rompue juste avant que le piston n'atteigne la fin de sa trajectoire descendante.

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