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

Product Information

This modified arrangement was tested with a 3 mg payload of lidacaine powder using a 5 ml cylinder of helium at 30 bar. the bursting of the rupturable membrane can make operation of the syringe fairly noisy, which can be a disadvantage when treating small children for example. the right-hand end (as drawn) of the gas cylinder 44 is provided with a longitudinally extending nose 49 , which nose is capable of being fractured, so as to allow the escape of gas from the interior of the cylinder 44 , upon the application of lateral pressure to the nose 45 in the direction identified by the arrow referenced 46 . These particles have a lower density than either polystyrene or lidocaine and consequently they do not penetrate as deeply for a given velocity.

the Venturi effect means that the position 73 of lower cross-sectional area will have a reduced pressure as compared to the position 72 of higher cross-sectional area. a known volume of gas at a known pressure is suddenly released from the gas source (not shown) into the central aperture of the main body to the upstream side of the sonic nozzle 4 . the present invention is primarily concerned with the reduction of noise and improved uniform particle spread that can be achieved by using the Venturi effect to draw the particles into the gas flow path. The term " hypospray", although better known within science fiction, originates from a jet injector known as the Hypospray; it has been cited within several scientific articles. the eighth embodiment provides a further modification to the divergent section 17 of the exit nozzle which can ameliorate this effect.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.

Such filters have an upper limit to gas velocity through the filter so as to ensure that they operate to the specification. the passage through the nozzle has an upstream convergent portion, leading through a throat to a downstream, divergent portion. is a schematic cross-section along the central longitudinal axis of the downstream end of a first embodiment of needless syringe in accordance with the present invention. a gas source is necessary to pressurize the central aperture of the main body 1 upstream of the sonic nozzle 4 (ie. If you’ve had a needle-free filler and developed a side effect, it’s best to get checked by a medical doctor like a board-certified dermatologist.This embodiment has the further advantage that no atmospheric air is induced into the gas flow meaning that the device is self-contained in use. 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 . The subjects were thirty-four children ranging in age between 5 and 15 years, on whom forty-five dental procedures were completed. the lever 66 In the final stages of pressing the actuating lever 66 , the lever 66 abuts the actuating pin 47 and further pressure causes the frangible tip 49 of the gas cylinder 44 to fracture and thereby triggers the device ( FIG.

A jet injector, also known as a jet gun injector, air gun, or pneumatic injector, is a medical instrument that uses a high-pressure jet of liquid medication to penetrate the skin and deliver medication under the skin without a needle. the sonic nozzle 4 may be held in place within the central aperture of the main body 1 by cooperating screwthreads, or an interference fit in combination with a downstream shoulder formed by the main body 1 .

A variation in particle velocity can make it difficult to deliver high-potency powdered drugs, vaccines etc to specific target layers within the skin.

is a schematic cross-section along the central longitudinal axis of a needleless syringe of the first embodiment of the invention, showing a push-button gas cylinder.A CDC investigation found 57 out of 239 people who had received the jet injection tested positive for hepatitis B. the sonic nozzle constriction 5 b has a significantly reduced flow cross-section relative to the flow cross-section of the particle entrainment chamber 8 . the particles are introduced in this chamber and in fact they may be introduced at any position in the device where there is a reduced pressure region in the gas flow path.