N / C 100 5ml needleless plastic syringes, can be used multiple times, suitable for scientific laboratory, metering, watering, adding water, refueling

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a large divergent portion 17 of the exit nozzle 2 can cause “coring” whereby the boundary layer separates from the nozzle walls and the majority of the jet power is concentrated along a central longitudinal axis such that the particles are not evenly distributed across the full area of the nozzle at the nozzle exit plane. This device also has a 10 mm diameter exit plane and the downstream parallel extension 65 is 30 mm long. This embodiment can therefore be utilized to provide a more even spread of particles and less “coring” of the gas stream.

When the cassette is engaged in a recess provided in the exterior side wall of the main body 1, for example to form an interference fit therewith, a hole in the cassette provided at the base of the reservoir 12 lines up in communication with the particle inlet passage 10. a closed gas cylinder containing a single dose of gas sufficient for a single needleless injection may be provided. Preventing contamination between injections with multiple-use nozzle needle-free injectors: a safety trial". the first and third embodiments (with a parallel sided nozzle bore 3 ) are thought to have particular application in dentistry where it is useful to achieve penetration of a small target area and where the mucosal surfaces are relatively easy to penetrate. mm for the first and second convergences respectively, equating to a flow cross-sectional area ratio of 1:5.

the surface area of such a filter could clearly be chosen to match the gas velocity therethrough that will be encountered in use. this embodiment because there is no chamber 8 , there is no second convergence as such and the gas flow path diverges from the point of minimum cross-section of the first convergence 5 ′ to the cross-section of the nozzle bore 3 . Oscar Banker, an engineer, patented his invention of a portable multi-use nozzle jet injector that utilizes CO 2 as its energy source. particles can be delivered at a large range of velocities with potentially non-uniform spatial distribution across the target surface. It is thought that this relative positioning is relevant if, as is described below, particles are to be drawn into the particle entrainment chamber 8 as a result of the creation of a reduced (sub-atmospheric in this embodiment) pressure region within the chamber 8 .

shows a sixth embodiment of the invention which combines many of The features of the previously described embodiments but also has a novel actuating Mechanism which serves to align the powder cassette plug 52 into the operating position and Actuates the cylinder fracturing mechanism in one simple operation. the nozzle 2 bounds the gas flow path, that is to say it surrounds and defines the space through which the gas may flow. The preferred driver gas is helium because it gives much higher gas velocity than air, nitrogen or CO 2.g. needle pain, the risk of introducing infection to treated individuals, the risk of contamination or infection of health care workers caused by accidental needle-sticks and the disposal of used needles). Free to everyone, these materials teach young people about common skin conditions, which can prevent misunderstanding and bullying.