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

Product Information

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 .

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). A hepatitis B outbreak occurs amongst 57 patients at a Los Angeles clinic due to a Med-E-Jet injector. In addition to getting medical care, anyone who has developed a side effect caused by a needle-free filler is asked to report this to the FDA. In addition, flow considerations inside the syringes can limit the maximum size of the target area on the target tissue over which the particles may be spread, limiting the maximum particle payload size. the aperture of the first convergence is coaxial with the central longitudinal axis of the bore 3 of the nozzle 2 .the gas source may advantageously take the form of a single shot gas canister, preferably a helium gas canister. a mechanism is provided whereby the powder can be moved from the storage position to the operating position and the device can be triggered in one easy movement.

Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list. Particles larger than about 250 μm can also be delivered from these devices, with the upper limitation being the point at which the size of the particles would cause untoward pain and/or damage to the target tissue. the idea behind it is that the gas should be expanded as quickly as possible so as to ensure that particles are accelerated by the fast moving gas stream for the longest time period possible.and 20 show an exit nozzle 2 having a relatively short parallel section 16 followed by a divergent section 17 .

shows a fourth embodiment of needleless syringe in accordance with the present invention in which the chamber 8 has been replaced by a divergent section 60 .

the gas issuing from the device is actually a mixture of helium and air, due to the air that is drawn in along with the particles via the particle inlet passage 10 . This device also has a 10 mm diameter exit plane and the downstream parallel extension 65 is 30 mm long. low driving pressures (5 ml at 25 bar) give very uniform distribution of the particles on the target but with relatively low penetrations (160 to 180 ⁇ m) of 47 ⁇ m diameter polystyrene beads into a 3% agar gel target.

has been developed in which a short parallel section 16 is followed by a divergent section 17 which in turn is followed by a parallel section 65 . is a reconstruction of a diametral 10 mm wide slice through the agar target, showing the uniformity of distribution and penetration of the particles across the full width of the target.Although penetration depth has again fallen slightly (to 140 ⁇ m), the powder was still found to be substantially uniformly distributed over the full target area, the target area of course this time having a diameter of approximately 14 mm. Retrograde flow happens after the jet stream penetrates the skin and creates a hole, if the pressure of the jet stream causes the spray, after mixing with tissue fluids and blood, to rebound back out of the hole, against the incoming jet stream and back into the nozzle orifice.