COMBINATION PLUNGER DEVICE FOR A DUAL CHAMBER MIXING SYRINGE

摘要

A combination plunger, a mixing device and a mixing syringe including the same are provided. The mixing syringe includes concentric outer and inner barrels that form an outer chamber, the inner barrel having an inner chamber. The combination plunger includes a mixing plunger and a delivery plunger and a biasing means. The mixing plunger is slidably located in the outer chamber and translated by coordinated depression of the delivery plunger to transfer a first substance from the outer chamber to mix with a second substance in the inner chamber. After the mixing stage is complete, the delivery plunger is disengaged from the mixing plunger and permitted, such as by rotation, to be further depressed in the axial direction to deliver fluid contents of the mixing syringe to a recipient. The mixing syringe needle is then retracted as result of engagement by the delivery plunger and activation of the biasing means.

主权项

1. A combination plunger for a syringe mixing device, said combination plunger comprising: a mixing plunger and a delivery plunger are releasably engaged to facilitate coordinated or synchronous axial movement of the mixing plunger and the delivery plunger for at least a portion of operation of the combination plunger; and a pill housing having a biasing member.