the transfer of the particles using a needleless syringe yliäänikaasuvirtausta

A needleless syringe having a membrane (34) which is ruptured by gas pressure to generate a gas flow in which particles can be entrained so as to be injected. The invention also provides a product comprising a sealed unit comprising two diaphragms which are directly or indirectly sealed to one another around their edges, and which contain particles for transdermal injection.