Syringe for infusion

A - Human Necessities – 61 – M

Patent

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Details

A61M 5/155 (2006.01) A61M 5/315 (2006.01) A61M 5/142 (2006.01)

Patent

CA 2162909

A syringe is modified to permit gradual administration of its contents with reduced problems due to seizing or stiction of its piston by dividing its piston (6) axially into two parts, a front detached part (6A) and a rear part (6B) which is the only part having provision for attachment to a syringe actuator. The rear part has a passage (20) through which fluid can be gradually introduced from an actuator (38) into a chamber (28) between the parts so as to force the front part forward while the rear part is restrained against rearward movement. The passage may be initially closed by a septum (22) which is penetrated by a cannula (42) on the actuator. If the syringe actuator is a plunger, the syringe can be used conventionally.

Seringue modifiée permettant une administration progressive de son contenu en limitant les risques de blocage ou de striction de son piston. Ledit piston (6) est divisé axialement en deux parties: une partie avant séparée (6A) et une partie arrière (6B), seule à pouvoir se fixer à l'actuateur de la seringue. La partie arrière présente un passage (20) par lequel le fluide peut passer progressivement d'un actuateur (38) à une chambre (28) entre les parties du piston, de manière à forcer la partie avant vers l'avant, tandis que la partie arrière ne peut se déplacer vers l'arrière. Le passage peut initialement être fermé par un opercule (22) que vient percer une canule (42) montée sur l'actuateur. Avec un actuateur faisant office de piston, la seringue peut être utilisée de façon usuelle.

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