초록 ▼

A single use needless syringe for administering a fluid medication. The syringe comprises a hollow, tubular body which includes a gas storage portion defining a storage chamber containing a quantity of pressurized gas. The body also includes an ejector portion defining a piston chamber which is sele

A single use needless syringe for administering a fluid medication. The syringe comprises a hollow, tubular body which includes a gas storage portion defining a storage chamber containing a quantity of pressurized gas. The body also includes an ejector portion defining a piston chamber which is selectively placeable into fluid communication with the storage chamber and has a piston movably disposed therein. In addition to the gas storage and ejector portions, the body has a barrel portion defining a delivery chamber for receiving a prescribed dosage of the fluid medication, with the delivery chamber being oriented relative to the piston chamber such that the piston is advanceable into the delivery chamber. A discharge orifice of the body fluidly communicates with the delivery chamber and allows the fluid medication to be filled thereinto and expelled therefrom. The syringe further comprises a fracturable release member which is disposed within the body and normally prevents the flow of the compressed gas from the storage chamber into the piston chamber. Removably attachable to the body is a trigger mechanism of the syringe which includes a stem portion partially insertable into the body and engagable to the release member, and a head portion attached to the stem portion. The application of compressive pressure to the head portion subsequent to the insertion of the stem portion into the body facilitates the fracture of the release member and resultant flow of the pressurized gas into the piston chamber. The compressed gas acts against the piston in a manner forcing the piston into the delivery chamber which causes the fluid medication to be expelled therefrom via the discharge orifice.

대표청구항 ▼

[What is claimed is:] [1.]a hollow, tubular body comprising:a gas storage portion defining a storage chamber containing a quantity of a compressed gas;an ejector portion defining a piston chamber which is selectively placeable into fluid communication with the storage chamber and has a piston movabl

[What is claimed is:] [1.]a hollow, tubular body comprising:a gas storage portion defining a storage chamber containing a quantity of a compressed gas;an ejector portion defining a piston chamber which is selectively placeable into fluid communication with the storage chamber and has a piston movably disposed therein;a barrel portion defining a delivery chamber for receiving a prescribed dosage of the fluid medication, the delivery chamber being oriented relative to the piston chamber such that the piston is advanceable into the delivery chamber; anda discharge orifice in fluid communication with the delivery chamber for allowing the fluid medication to be filled thereinto and expelled therefrom;a fracturable release member disposed within the body for preventing the flow of the compressed gas from the storage chamber into the piston chamber; anda trigger mechanism removably attachable to the body and comprising:a stem portion partially insertable into the body and engagable to the release member; anda head portion attached to the stem portion;wherein the application of compressive pressure to the head portion subsequent to the insertion of the stem portion into the body facilitates the fracture of the release member and resultant flow of the compressed gas into the piston chamber, the compressed gas acting against the piston in a manner forcing the piston into the delivery chamber which causes the fluid medication to be expelled therefrom via the discharge orifice.