초록 ▼

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 du

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.

대표청구항 ▼

[ What is claimed as invention is:] [1.] A dual chamber syringe for dispensing a dry medicine that is to be reconstituted just prior to administration to a patient comprising:a) a syringe housing having an outer wall and proximal and distal end portions;b) a bore that extends between the proximal an

[ What is claimed as invention is:] [1.] A dual chamber syringe for dispensing a dry medicine that is to be reconstituted just prior to administration to a patient comprising:a) a syringe housing having an outer wall and proximal and distal end portions;b) a bore that extends between the proximal and distal end portions, the bore including upper and lower chambers for containing medicine contents to be dispensed including an upper liquid component and a lower dry component;c) a dispensing portion at the distal end of the housing for receiving the medicine contents of the bore;d) a first piston that occupies a position generally in between the upper chamber and the lower chamber, the first piston being movable within the bore between upper and lower positions during use;e) a second piston positioned at the proximal end of the housing and movable within the bore between upper and lower positions during use;f) an enlarged diameter section of the housing defining a bypass bore section for enabling fluid travel between the upper and lower chambers;g) a plurality of bypass channels positioned in the bypass bore separated by a plurality of ribs, the ribs having recessed portions for receiving the periphery of the first piston as fluid flows through the longitudinal channels; andh) wherein the first piston seals the contents of the upper chamber away from the channels and lower chamber in the upper position.