Hypodermic syringe with selectively retractable needle

A - Human Necessities – 61 – M

Patent

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Details

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

Patent

CA 2354813

A retractable needle syringe includes a barrel defining a receiver. There is a plunger having an inner rod extending distally from the proximal end. The plunger includes a hollow sleeve that is disposed over and extend beyond an inner rod. The plunger includes a hollow cutter extending from the inner rod and a stopper disposed over the end of the sleeve. The plunger has a displaceable collar to prevent movement of the inner rod with respect to the sleeve, that is by distal force to the plunger by engagement with the proximal end of the barrel allowing the cutting surface to cut through the stopper. There is a hub with a stem, a proximal flange and an engagement. A clip having a proximal foot with an opening therethrough and a distal grip is disposed on the stem of the hub. The proximal foot of the clip is disposed at the distal surface of the flange and the grip at the engagement on the stem. There is a spring disposed about the stem compressed between the receiver and the clip to provide a bias, so that when sufficient force is applied to the plunger causing; the cutting surface to cut through the stopper, the cutting surface then engages, cuts through the flange to engage the clip and cause the clip to release the engagement on the stem. This allows the spring to urge the hub to a position within the syringe.

L'invention concerne une seringue hypodermique avec aiguille rétractable qui comprend un corps définissant un receveur. Un piston doté d'une tige interne s'étend de manière distale de l'extrémité proximale. Le piston comprend un rodet creux qui est disposé sur une tige interne et qui en fait saillie. Le piston comporte un tranchant en pointe qui s'étend de la tige interne et un butoir disposé sur l'extrémité du rodet. Le piston est pourvu d'un col déplaçable pour prévenir le mouvement de la tige interne par rapport au rodet, c'est-à-dire par force distale sur le piston par l'engagement avec l'extrémité proximale du corps permettant à la surface tranchante de passer à travers le butoir. Il y a un mandrin avec une tige, un rabat proximal et un engagement. Une broche munie d'un pied proximal doté d'une ouverture et d'une prise distale est disposée sur la tige du mandrin. Le pied proximal de la broche est disposé à la surface distale du rabat et de la prise sur l'engagement sur la tige. Un ressort est disposé autour de la tige et comprimé entre le receveur et la broche pour fournir une polarisation. Ainsi, lorsqu'une force suffisante est exercée sur le piston, le plan de coupe traverse le butoir, puis passe à travers le rabat pour entrer en prise avec la broche, qui libère alors l'engagement sur la tige. Cela permet au ressort de pousser le mandrin à une position à l'intérieur de la seringue.

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