Medical needle safety devices

A - Human Necessities – 61 – M

Patent

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Details

A61M 5/32 (2006.01)

Patent

CA 2667455

A safety device for shielding the sharp tip (36) of a medical needle (12) has a needle mount (10) which either directly supports a medical needle, or indirectly supports the needle for instance where the needle is provided as a part of a syringe. A sleeve (20) is carried directly or indirectly on the needle mount (10) and is slidably movable to a needle shielding position where the sleeve surrounds the needle sharp tip. A spring (30) including forwardly projecting spring blades (32) when sufficiently loaded acts on an internal conical surface (24) of the sleeve to drive the sleeve to its shielding position and a locking mechanism (26, 34) then locks the sleeve in that position. A camming mechanism (18,33) serves to load the spring blades (32) in the course of the use of the safety device such that thereafter the interaction of the blades (32) with the conical surface (24) urges the sleeve to its shielding position, the camming mechanism (18,33) being activated by movement of the sleeve to expose the needle for use.

L'invention concerne un dispositif de sécurité pour couvrir le bout pointu (36) d'une aiguille médicale (12), qui présente une fixation d'aiguille (10) qui soit supporte directement une aiguille médicale, soit supporte indirectement l'aiguille par exemple lorsque l'aiguille fait déjà partie d'une seringue. Un manchon (20) est disposé directement ou indirectement sur la fixation d'aiguille (10) et est capable de glisser dans une position de protection d'aiguille dans laquelle le manchon entoure le bout pointu de l'aiguille. Un ressort (30) comprenant des lames de ressort (32) saillant vers l'avant lorsqu'il est suffisamment chargé, agit sur une surface conique interne (24) du manchon pour pousser le manchon dans sa position de protection et un mécanisme de verrouillage (26, 34) verrouille alors le manchon dans cette position. Un mécanisme à came (18, 33) sert à charger les lames de ressort (32) pendant l'utilisation du dispositif de sécurité de telle sorte que par la suite, l'interaction des lames 23 avec la surface conique 24 pousse le manchon dans sa position de recouvrement, tandis que le mécanisme à came (18, 33) est activé par le mouvement du manchon, de manière à exposer l'aiguille en vue de son utilisation.

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