Actuation mechanisms for dual chamber mixing syringes
First Claim
1. An actuating device 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 delivery plunger seal disposed in the inner barrel, and at least one mixing plunger seal disposed in the outer chamber between the inner barrel and the outer barrel, the actuating device comprising a housing connectable to the syringe, a rotatable trigger member, a biasing member, a delivery plunger disposed to bear against the delivery plunger seal of the syringe, and a mixing plunger releasably engaged with the trigger member in an initially locked state, the mixing plunger being disposed to bear against 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.
3 Assignments
0 Petitions
Accused Products
Abstract
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.
58 Citations
20 Claims
- 1. An actuating device 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 delivery plunger seal disposed in the inner barrel, and at least one mixing plunger seal disposed in the outer chamber between the inner barrel and the outer barrel, the actuating device comprising a housing connectable to the syringe, a rotatable trigger member, a biasing member, a delivery plunger disposed to bear against the delivery plunger seal of the syringe, and a mixing plunger releasably engaged with the trigger member in an initially locked state, the mixing plunger being disposed to bear against 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.
Specification