One use syringe with ratchet on plunger and pawl on body

Details One use syringe with ratchet on plunger and pawl on body One use syringe with ratchet on plunger and pawl on body

A - Human Necessities

61

M

A61M 5/315 (2006.01)

Patent

CA 2554427

A syringe (10) has a plunger (20), a barrel (11) and a collar (40, 50) with two pawls (42A, 42B). The plunger has two opposed ratchets (23A, 23B) that align with the one each of the the pawls and thereby or impede, withdrawal of the plunger during or following depression of the plunger. The barrel has a collar with an inner (50)and an outer member (40) that are incapable of rotation relative with respect to each other. The outer member has the two pawls (42A, 42B) and two fingers that slidably engage opposed guide slots (28) on the plunger to thereby prevent or minimize rotation of the plunger relative to the collar. The inner member of the collar is operable to prevent engagement of the plunger ratchet by the two pawls until the plunger is depressed.

L'invention concerne une seringue (10) comprenant un piston (20), un cylindre (11) et un collier (40, 50) doté de deux cliquets (42A, 42B). Le piston comprend deux rochets opposés (23A, 23B) s'alignant avec un cliquet respectif et empêchant ou entravant le retrait du piston pendant ou après la dépression de celui-ci. Le cylindre comprend un collier doté d'éléments interne (50) et externe (40) ne pouvant tourner l'un par rapport à l'autre. L'élément externe comprend deux cliquets (42A, 42B) et deux doigts venant en prise coulissante avec des fentes de guidage opposées (28) sur le piston, de manière à empêcher ou minimiser la rotation du piston par rapport au collier. L'élément interne du collier permet d'empêcher le rochet du piston de venir en prise avec les deux cliquets jusqu'à la dépression du piston.

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