| 主权项 |
1. A device for administering injections comprising:
a housing having an upper end, a lower end including a bottom surface with an injection needle opening, and an axis extending between said upper and lower ends of said housing; an injection needle disposed within said housing for moving along said axis between a retracted position in which said injection needle is disposed within said housing and an extended position in which a distal end of said injection needle extends through said injection needle opening at said bottom surface of said housing; a first conduit for directing a first liquid component toward said injection needle; a second conduit for directing a second liquid component toward said injection needle; an injection actuator coupled with said injection needle for moving said injection needle from said retracted position to said extended position and advancing said first and second liquid components toward said injection needle for dispensing a liquid solution including said first and second liquid components from said distal end of said injection needle; a first syringe barrel in fluid communication with said first conduit, and a first plunger in said first barrel for alternatively drawing said first liquid component into said first barrel and dispensing said first liquid component from said first barrel and into said first conduit; a second syringe barrel in fluid communication with said second conduit, and a second plunger in said second barrel for alternatively drawing said second liquid component into said second barrel and dispensing said second liquid component from said second barrel and into said second conduit; a plunger base moveable along said axis of said housing and being connected with said first and second plungers for ensuring simultaneous movement of said first and second plungers between said upper and lower ends of said housing so that said first and second liquid components are simultaneously drawn into and dispensed from said first and second syringe barrels; wherein said first conduit comprises a first one-way check valve for directing flow of said first liquid component in a single downstream direction, said first one-way check valve including an upstream opening coupled with said first reservoir and a downstream opening, a first T-connector having a first opening in fluid communication with said downstream opening of said first one-way check valve, a second opening in fluid communication with said first syringe barrel, and a third opening, and a first tube having a proximal end in fluid communication with said third opening of said first T-connector and a downstream end in fluid communication with said injection needle, wherein said first liquid component flows between said first and second openings of said first T-connector as said first liquid component is drawn into said first syringe barrel and flows between said second and third openings of said first T-connector and into said proximal end of said first tube as said first liquid component is dispensed from said first syringe barrel; wherein said second conduit comprises a second one-way check valve for directing flow of said second liquid component in a single downstream direction, said second one-way check valve including an upstream opening coupled with said second reservoir and a downstream opening, a second T-connector having a first opening in fluid communication with said downstream opening of said second one-way check valve, a second opening in fluid communication with said second syringe barrel, and a third opening, and a second tube having a proximal end in fluid communication with said third opening of said second T-connector and a downstream end in fluid communication with said injection needle, wherein said second liquid component flows between said first and second openings of said second T-connector as said second liquid component is drawn into said second syringe barrel and flows between said second and third openings of said second T-connector and into said proximal end of said second tube as said second liquid component is dispensed from said second syringe barrel; at least one catch projecting from an outer surface of a needle housing for selectively coupling said needle housing and said plunger base together for providing simultaneous movement of said needle housing and said plunger base along said axis of said housing; at least one catch actuator coupled with said at least one catch for selectively decoupling said needle housing from said plunger base so that said needle housing and said plunger base are capable of moving independently of one another along said axis of said housing; and a plunger spring having an upper end in contact with said plunger base and a lower end in contact with said housing, wherein said plunger spring is compressed when said at least one catch of said needle housing is coupled with said plunger base for storing energy in said plunger spring, wherein said at least one catch is adapted for being decoupled from said plunger base so that said energy stored in said plunger spring urges said plunger base away from said bottom surface of said housing for driving said first and second plungers into said respective first and second syringe barrels as said plunger base moves away from said bottom surface of said housing. |
