Actuation mechanisms for dual chamber mixing syringes

摘要

An automatic mixing device, an actuating device having integrated plunger and configured to be removably mounted to the automatic mixing device, and a retractable syringe having the automatic mixing device are provided. The actuating device has an initially compressed spring and a trigger member that is rotatable to initiate spring decompression to drive depression of a mixing plunger seal of the automatic mixing device. Another seal located in an outer chamber of the mixing device is capable of axial movement upon depression of the mixing plunger, from a first position in sealing engagement with one or more apertures in an inner barrel to a second position intermediate the apertures and vents in an outer barrel. This allows depression of the mixing plunger to force a first substance from the outer chamber through the apertures to mix with a second substance in an inner chamber of the inner barrel. The mixed substance in the inner barrel is then delivered by the syringe with subsequent needle retraction.

主权项

1. An actuating device removably mountable to an automatic mixing syringe, said syringe including an inner barrel, an outer barrel, an outer chamber between the inner barrel and the outer barrel, a deliver plunger seal disposed in the inner barrel, and at least one mixing plunger seal, disposed in the outer chamber, the actuating device comprising a housing releasably connectable to the syringe, a rotatable trigger member, a biasing member, a delivery plunger engageable with the delivery plunger seal of the syringe, and a mixing plunger releasably engaged with the trigger member in an initially locked state and engageable with the at least one mixing plunger seal of the syringe, wherein said trigger member is operable to initiate said biasing member to facilitate depression of said mixing plunger when engaged with said at least one mixing plunger seal, wherein the mixing plunger comprises at least one prong, and wherein the trigger member comprises at least one slot member, and wherein in the initially locked state the at least one prong initially engages the at least one slot member and is rotatable out of engagement with the at least one slot member to initiate said biasing member to facilitate depression of said mixing plunger when engaged with said at least one mixing plunger seal to thereby mix a plurality of substances in said syringe.