Needlefree injections are used to reduce the pain
and lower tissue damage. The dose of liquid is ejected
under the action of a gas under pressure or a spring on
a piston. The efficiency of the method is higher, the
higher the pressure increase velocity at the piston. In
this connection, the proposals appeared to use the
energy of a microexplosion of a solid explosive for nee
dlefree injections [1] to accelerate the microcapsules
of drugs when they are introduced into the epidermis.
The explosive charge is placed in a tube, at the end of
which the container with the drug is put, separated
from the tube by a metal membrane. The membrane is
bent upon the explosion of the explosive, the drug is
thrown through a hole in the butt end of the tube and
forms a thin streamlet. The measured streamlet veloc
ity is 100 m/s, which is enough for performing the
painless needlefree injection [1]. The drawback of
such a method is the necessity to use a solid explosive,
the combustion products of which are toxic. In this
work, we study the possibility to replace the solid
explosive in needlefree injection devices with a
hydrogen–air mixture, the combustion product of
which is water. This will make it possible to strongly
increase the region of the application of this method.
To this end, it is necessary to design a device that trans
fers the energy of the gas detonation products to the
drug in order to produce the same steep pressure front
as that during the explosion of the solid explosive.
For t