Gas powered self contained syringe
First Claim
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1. A syringe comprising a piston housing having distal and proximal ends;
- a piston in said piston housing adapted for reciprocal movement therein, said piston having a central opening and a co-axially aligned elongated tubular portion extending out of the lower end of said piston housing adapted to be inserted into a syringe cartridge to expel medication therefrom, a power cap on the proximal end of said piston housing having a central opening;
a step passing through the central opening in said power cap and the central opening in said piston, said stem being disconnectably connectable to said piston for moving said piston in said piston housing;
a reagent means which can be rapidly converted to gas located in said power cap adjacent to the proximal end of said piston housing for driving said piston down said piston chamber; and
a means for activating said reagent means to gas when said stem is disconnected from said piston.
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Abstract
The present invention is directed to a syringe that includes a gas driven piston to force liquid medication from a syringe cartridge through a variety of injection nozzles. The syringe may be mechanically operated for loading or aspirating the syringe.
122 Citations
14 Claims
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1. A syringe comprising a piston housing having distal and proximal ends;
- a piston in said piston housing adapted for reciprocal movement therein, said piston having a central opening and a co-axially aligned elongated tubular portion extending out of the lower end of said piston housing adapted to be inserted into a syringe cartridge to expel medication therefrom, a power cap on the proximal end of said piston housing having a central opening;
a step passing through the central opening in said power cap and the central opening in said piston, said stem being disconnectably connectable to said piston for moving said piston in said piston housing;
a reagent means which can be rapidly converted to gas located in said power cap adjacent to the proximal end of said piston housing for driving said piston down said piston chamber; and
a means for activating said reagent means to gas when said stem is disconnected from said piston.
- a piston in said piston housing adapted for reciprocal movement therein, said piston having a central opening and a co-axially aligned elongated tubular portion extending out of the lower end of said piston housing adapted to be inserted into a syringe cartridge to expel medication therefrom, a power cap on the proximal end of said piston housing having a central opening;
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2. A syringe comprising a piston housing having distal and proximal ends;
- a syringe cartridge attached to the distal end of said piston housing, an injection tip disconnectably connected to said syringe cartridge, a piston in said piston housing adapted for reciprocal movement therein, said piston having a central opening and an elongated portion extending out of the distal end of said piston housing into said syringe cartridge and adapted to expel medication therefrom, a power cap on the proximal end of said piston housing having a central opening;
a stem passing in sealing engagement through the central opening in said power cap and the central opening in said piston, said stem being disconnectably connectable to said piston for moving said piston in said piston housing and the elongated portion in aid syringe cartridge;
a reagent means located in said power cap adjacent to the proximal end of said piston housing for driving said piston down said piston chamber and the elongated portion down said syringe cartridge to eject medication therefrom; and
activating means for converting said reagent to gas when said stem is disconnected from said piston. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
- a syringe cartridge attached to the distal end of said piston housing, an injection tip disconnectably connected to said syringe cartridge, a piston in said piston housing adapted for reciprocal movement therein, said piston having a central opening and an elongated portion extending out of the distal end of said piston housing into said syringe cartridge and adapted to expel medication therefrom, a power cap on the proximal end of said piston housing having a central opening;
- 10. A method of giving an injection to a person comprising connecting a syringe cartridge to the distal end of a syringe, disconnectably connecting a syringe stem to a piston located in a piston housing of the syringe, loading the syringe cartridge with medication by extending the syringe stem out of the proximal end of the piston housing, disconnecting the syringe stem from the piston, placing the syringe against the desired location of the person to be injected, causing gas to expand in the piston housing to drive the piston toward the loaded syringe cartridge whereby medication is expelled from the cartridge and injected into the desired location of the person to be injected.
Specification