NEEDLE FREE INJECTORS

摘要

Improved needle free injectors comprising of a energy sources, triggering mechanisms, impact members, and drug delivery pistons are disclosed. In one preferred embodiment, the triggering mechanism comprises a spool which seals an energy source comprised of compressed gas and a component for releasing the spool to release the pressurized gas and urge a ram forward to force a drug containing formulation through a drug delivery orifice. The device may include a cap covering the orifice and safety mechanisms to prevent accidental delivery

主权项

1. A needle free injector, comprising:
a pressurized gas cylinder; a spool comprising a storage seal that maintains the gas cylinder in a pressurized state during storage; a means for releasing the spool in a manner which releases the pressurized gas into a chamber; a ram slidably positioned in the chamber in a manner such that the ram is urged forward by released pressurized gas; and a drug container holding a liquid drug formulation in fluid connection with a drug delivery orifice; wherein the ram is forced to move by released pressurized gas, causing the liquid formulation to be delivered through the drug delivery orifice.