초록

Injection devices, such as needleless injection devices, and methods of making and using the same are disclosed.

대표청구항 ▼

1. An injection device comprising:a first housing having a gas chamber containing a source of gas, a port in fluid communication with the source of gas, and a displacement mechanism; a movable plunger in the first housing, the plunger being in fluid communication with the port and the source of gas;

1. An injection device comprising:a first housing having a gas chamber containing a source of gas, a port in fluid communication with the source of gas, and a displacement mechanism; a movable plunger in the first housing, the plunger being in fluid communication with the port and the source of gas; and a second housing defining an orifice configured for needless injection, the second housing including a first piston and a second piston slidably positioned in the second housing, the first and second pistons being movable by the displacement mechanism independently of the motive power of the source of gas, the second housing, the first piston, and the second piston defining a first chamber capable of storing a fluid, the second housing and the second piston defining a second chamber capable of storing and mixing a drug, the second chamber being in fluid communication with the orifice, the plunger being configured to move the first piston toward the second piston, and to move the second piston to a position providing fluid communication between the first chamber and the second chamber, the first chamber capable of decreasing in volume and the fluid in the first chamber capable of transferring to the second chamber, and the plunger configured to move the second piston upon release of gas from the source of gas, to decrease the volume of the second chamber, and to expel the fluid from the second chamber and through the orifice.