Dual chamber syringe apparatus

Details Dual chamber syringe apparatus Dual chamber syringe apparatus

1998-01-09

1999-10-26

Stright, Ronald

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604 89, 604181, 604187, 604191, A61M 3700

Patent

active

059719532

ABSTRACT:
A dual chamber syringe for dispensing a dry medicine that is to be reconstituted just prior to administration to a patient includes a syringe housing having an outer wall and proximal and distal end portions. A syringe bore extends between the proximal and distal end portions. The bore is divided during use into upper and lower chambers for containing medicinal contents that are to be first mixed and then dispensed. In the preferred embodiment, the chambers contain an upper liquid component and a lower dry component. A first lower piston occupies a position generally in between the upper and lower chambers. The first lower piston engages a plurality of ribs at an enlarged diameter bypass portal section of the syringe housing with multiple longitudinally extending channels after the user applies pressure to a second upper piston in the bore and above the upper chamber. Continued downward movement of the two pistons causes the two components to mix to be dispensed from the distal end of the syringe. The ribs have recess portions that form a dampening slot for engaging the periphery of the first lower piston as it travels distally. This enables the diluent fluid to completely mix with the dry drug product before the second, upper piston engages the lower piston to force it down during administration of the reconstituted product to the patient.

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