Nonreusable medical device with front retraction

A - Human Necessities – 61 – M

Patent

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Details

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

Patent

CA 2172074

A nonreusable medical device has a needle (34) for injecting or collecting fluid which is retractable by depression of a plunger (54) slidingly mounted in the medical device. A front- mounted retraction mechanism (22) has a needle holder connected to the needle. The needle holder is supported along the axis of the device by means of a frictionally engaged retainer ring (102) member coupled to the needle holder along an axially aligned sliding interface, The needle holder and retainer ring are positioned in the front portion of a hollow body. The front of a movable member or plunger presses against the retainer member passing around the needle holder which cannot move forward, thereby separating die retainer member from the needle holder. The separation occurs by gradually inducing the extent of the sliding interface area until the retainer member pops loose from the needle holder whereupon the needle holder and needle are retracted into a cavity in the plunger in response to a retraction force applied to the needle holder by a previously compressed spring.

Un dispositif médical non réutilisable présente une aiguille (34 rétractable par dépression d'un piston (54) monté pivotant dans ledit dispositif) et conçue pour injecter ou collecter un liquide. Une mécanisme de rétraction frontale (22) présente un support d'aiguille relié à l'aiguille. Ledit support d'aiguille est supporté le long de l'axe du dispositif par un élément à bague de retenue engagé par friction accouplé au support de l'aiguille le long d'une interface coulissante alignée axialement. Le support de l'aiguille et l'anneau de retenue sont placés dans la partie frontale d'un corps creux. La partie frontale d'un élément mobile ou d'un piston appuie contre l'élément de retenue passant autour du support de l'aiguille qui ne peut être déplacé vers l'avant, l'élément de retenue étant ainsi séparé du support de l'aiguille. La séparation s'effectue par réduction graduelle de l'étendue de la surface de l'interface coulissante jusqu'à ce que l'élément de retenue se détache du support de l'aiguille, ce dernier ainsi que l'aiguille étant rentrés dans une cavité formée dans le piston en réponse à une force de traction appliquée sur le support de l'aiguille par un ressort préalablement comprimé.

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