Needleless hypodermic injection device

A needleless hypodermic injection device for injecting a liquid medication comprising

• a rigid housing,
• said housing having therewithin a nozzle body defining a cavity and projecting outwardly from a first open end adapted to receive and be connected with the nozzle body and a second closed end,
• said housing having an interior defining a chamber extending between said open end and said closed end said chamber being adapted to receive
• a first deformable diaphragm which together with said cavity of said nozzle body forming a medication chamber suitable for receiving a predetermined amount of a medication, and
• a second deformable diaphragm at least a portion of which extends around a portion of said first deformable diaphragm, said second deformable diaphragm and said housing thereby forming together a chamber for receiving pyrotechnic means for generating gas and ignition means for igniting said pyrotechnic means,
• said nozzle body having at its outer end an orifice which is the outlet of a channel for loading a liquid medication into the medication chamber and for ejecting said medication out of said chamber when a gas pressure generated by an ignition of said pyrotechnic means is applied to said second deformable diaphragm and thereby to said first deformable diaphragm.

A device for performing a needleless hypodermic injection of a liquid medication contained in a medication unit within the device, said device including pyrotechnical means for generating sufficient gas within the device to provide a predetermined pressure value necessary for injecting the medication, said device comprising

• (a) a medication unit for storing a volume of liquid medication to be injected, said medication unit having a first region and a second region that are in liquid communication with each other, said first region being deformable and said second region having an ejection outlet,
• (b) a first rigid housing part having a first zone for receiving said medication unit,
• (c) a second rigid housing part comprising pyrotechnical means comprising a propellant,
• said first and second housing parts being connectable with each other and defining a single chamber, and
• (d) a deformable barrier arranged within said single chamber for dividing said chamber in two zones, a first zone wherein said medication unit is located and a second zone where said propellant is located,
• a gas pressure generated by a selective ignition of said propellant being directly applied to said deformable barrier and thereby to said deformable region of said medication unit for ejecting said medication through said ejection outlet of said second region of said medication unit.