| 摘要 |
The nozzle of a gene injection gun is lined inside with a conduit, which has a narrow throat. The throat has a convergent inlet and a divergent outlet. Compressed gas is fed from the inlet, and accelerates to supersonic speed in the throat region. Liquid drug is released to the throat region as droplets, and carried by the accelerated gas flow toward the outlet of the muzzle for injection into a biological body.
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