| 摘要 |
A needle-less injector (10) suitable for injecting liquid medication through a skin surface of a patient includes a housing (12), a driver (50), a pop valve (108) and a trigger. The housing containing the liquid medication and a gas storage chamber with the pop valve sealing the gas in the housing. The resistance sensitive trigger is coupled to the pop valve and is used to release the pop valve, such that it pops open into the gas storage chamber to release the gas to activate the driver to force the liquid medication out of the housing. The resistance sensitive trigger is activated upon application of a predetermined amount of pressure to the resistance sensitive trigger that is opposed by a predetermined amount of resistance. The predetermined amount of resistance results from the contact with the skin surface, and when this predetermined level is reached the liquid medication pierces the skin surface.
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