The pain is gone!

When you have been a kid were you scared of needles? Were you scared of going and seeing a doctor because of pain then medicine is injected? Well this pain is the past. You won't need to worry about your kids as they simply won't feel it! And it is not because their pain genes will be changed but due to physics stepping into medicine. In the nearby future drugs will be injected without a pain at all. How will they do this? It is extremely hard to believe but lasers will be used for this reason. You may think that lasers will burn a hole in you to inject medicine, but this is not so straight forward. Anyway mechanism actually is not too hard. To form 150 millionths of a meter, just slightly thicker than a hair, diameter jets of drugs a micronozzle is used. It is attached to the water chamber by a flexible membrane. Process starts when laser heats water which vaporises so the pressure builds up as water vapor needs more space compared than it is in liquid phase. After pressure reaches a certain value, flexible membrane is pushed into the micronozzle. This happens so quickly that drugs are pushed out with a very big velocity. Due to speed and thickness jets passes through the protective layer of skin. Depending on the power of the laser everything changes: the time how quickly water is vaporized, speed of the jet of drugs and its penetration depth in the skin. Scientists had to overcome a lot of challenges to get proper results. They had to choose laser with right energy, duration of the laser pulse, diameter of the nozzle and hundreds of other parameters to make this perfect for use. For example diameter of the nozzle should be as small as possible to make penetration easier. At the same time if it is too thin there will occur some unwanted effects. Sadly this won't be applied for taking blood as it requires a constant withdrawal and this new method helps only for single injections. Hopefully in the future giving blood will become easy as these shots of medicine and everyone will donate it. This could make possible to heal everyone who got into any kind of accident, lost a lot of blood and prevent a lot of deaths.