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Jet propels medicine syringe to 500 kilometers per hour

September 20 2005

Needleless syringe, like, not a novelty. But something (besides the price, of course) prevents them supplant traditional syringes. Because new developments in this area physicians are always greeted with interest. How do the present needleless injectors? A powerful spring (or compressed air) as a source of power piston, a closed volume of drugs descent: developing high blood pressure and drug penetrates through the pores in the skin, actually pushing it a bit for some brief moment. The advantages are obvious - there is almost no pain. No needles, so there is no risk of infection. People who are afraid of shots (children, for example) willingly agree to such an injection. Yet these systems are not perfect. Least because a contact device with the skin still going on. And most importantly - in such systems can achieve high precision dosing medication - how it gets inside? More recently, a group of students from the University of California (University of California, Berkeley) has developed a precision hypodermic needle, which does not require not only a needle, but in general contact with the patient. Called machine MicroJet. On your device is akin to ink-jet printers, but is made much more "subtle". High pressure in the microscopic chamber with the drug develop piezoelectric head, computer controlled. Of the profiled nozzle device, as the nozzle of the jet engine, a trickle of fluid emitted at a rate of 140 meters per second (504 kilometers per hour), with the jet diameter is only 0.07 millimeters. And it is three times less than the thinnest of the currently existing hypodermic needles injections. Which means - an area of skin affected by injection of less than nine times less than the number of affected nerve endings, that is - almost no pain. Do I need to explain that at this speed, the medicine just pierces the skin? The main thing - precision machinery, coupled with computer control allows accurate dosing is not available before "shot." "Other systems injections without needles have only three or four factory replacement setup, but human skin is very different - said Associate Professor Dan Fletcher (Dan Fletcher), adviser of student groups. - Skin is not only from person to person, but one rights in different places. " The new injector allows very smoothly pick up the parameters of the jet. Students manage its speed from the modest 33 meters per second to a maximum of 140. A quantity of liquid, which threw a syringe at a "shot", and ranged from 45 to 140 nanolitrov. While students tested jet action on the gel, similar to the mechanical parameters of the skin, and found that, depending on the settings of the jet medication penetrates to a depth of 1 to 8 millimeters. With regard to feelings, I believe the authors of the project, setting the parameters of the jet would pick the most comfortable conditions for the injection. Advertisement MicroJet not believe that it will completely replace conventional syringes, but good news is that physicians will receive high-tech alternative that can be very useful in some cases. For example, in microsurgery or in drug-treated joints (arthritis, etc.) may need a unique precision flying jets drugs. But this - in the future. In the meantime, students plan to go to experiments on animals and cadavers - to accurately debug the device, according to MEMBRANA.RU.

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