Recently, a group of South Korean scientists have developed a laser device that will create less pain while inserting an injection into his/her body. Scientists from Seoul National University in South Korea have developed a laser called “Erbium-doped Yttrium Aluminium Garnet”, in short Er:YAG.
The laser is combined with a small adaptor that contains the drug. Besides, there is a chamber that contains water act as a driving fluid. The laser propels the stream of liquid medicine/drugs with the perfect force to enter the skin by creating less pain compared to needles. A flexible membrane separates liquids (drugs and fluids). While injecting medicine/drugs, each laser pulse lasts only 250 millionths of a second. But within this short time, the laser generates a vapor bubble inside the driving fluid. The pressure of that vapor bubble puts elastic strain on the membrane. Due to this elastic strain, drugs are forced to be emerged from a narrow jet via a 150 millionths of a meter (micrometers) miniature nozzle. The jet is a bit larger than the width of a human hair. However, this super slim jet is able to reach the speed of 30m (100ft) per second.
Professor Jack Yoh of Seoul National University said, “The impacting jet pressure is higher than the skin tensile strength and thus causes the jet to smoothly penetrate into the targeted depth underneath the skin, without any splashback of the drug. The laser-driven microjet injector can precisely control dose and the depth of drug penetration underneath the skin.”
The scientists have tested the laser on guinea pigs. While the drugs had been injected few millimeters beneath the skin, the laser didn’t damage any tissue. Already this laser injection is being used in clinics. But the fact is, its very difficult to to control the jet strength and drug dose. However, Yoh is now working with a company to produce low-cost replaceable injectors for clinical use.
Undoubtedly, this is a great achievement for the South Korean scientists. People who are afraid of injecting syringe into their body would raise no objection, if all the clinics adopt this laser injection. To know more details about the laser injection, head over to Optical Society’s journal Optics Letters, where the scientists have described the entire process.