Controlled retraction syringe and plunger therefor

Details Controlled retraction syringe and plunger therefor Controlled retraction syringe and plunger therefor

A - Human Necessities

61

M

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

Patent

CA 2604322

A retractable syringe (11) and plunger (20) therefore are provided, whereby the plunger comprises a controlling means (62) which facilitates control of the rate of retraction of the retractable needle. By controlling the rate of needle retraction, the likelihood of blood spattering is reduced, thereby improving the user-friendliness and appeal of the retractable syringe. Typically, the syringe is a prefilled syringe. Following plunger depression, a symmetrical ejector member (92) releases the retractable needle (40) from a retaining member (30) to thereby allow retraction of the retractable needle. Needle retraction is facilitated by a biasing means (70), such as a spring or other compressible and/or de-compressible device. The plunger comprises a plunger housing (21), in which is located the controlling means. The controlling means may be a pneumatic air space (324) inside the plunger housing which automatically acts against the retracting needle to thereby control or regulate the rate of retraction.

L'invention concerne une seringue rétractable (11) et un piston (20) associé, ce piston comprenant un moyen de commande (62) facilitant la commande de la vitesse de rétraction de l'aiguille rétractable. La commande de la vitesse de rétraction de l'aiguille permet de réduire le risque de giclement de sang, d'où une convivialité et un attrait améliorés pour cette seringue rétractable. Habituellement, la seringue est une seringue pré-remplie. Après l'abaissement du piston, un élément d'éjection symétrique (92) libère l'aiguille rétractable (40) d'un élément de retenue (30), ce qui permet la rétraction de l'aiguille rétractable. La rétraction de l'aiguille est facilitée par un moyen de sollicitation (70), tel qu'un ressort ou un autre dispositif compressible et/ou décompressible. Le piston comprend un logement de piston (21) dans lequel le moyen de commande est logé. Le moyen de commande peut être une cavité pneumatique (324) à l'intérieur du logement de piston qui agit automatiquement contre l'aiguille rétractable en vue d'une commande ou d'une régulation de la vitesse de rétraction.

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