Recently, Harbin Institute of Technology in China has led the development of a new type of robot that can swim in human blood vessels for targeted drug therapy. This article is compiled from an article by New Scientist entitled "Tiny robots swim the front crawl through your veins".

It is not swimming swimmer Michael Phelps, but this miniature magnetic robot can move through the liquid at a rate of 10 microns per second. It is small and powerful enough to deliver drugs from the inside of human veins through more viscous fluids such as blood.

Freestyle is the fastest way for humans to swim. Therefore, Tianlong Li of Harbin Institute of Technology in China and his colleagues let game robots imitate this action.

Each nano swimmer is 5 meters long and has three main parts, such as two silver hinged sausages joined together. Its body is made of gold, with two magnetic arms made of nickel on both sides, and a magnetic field is applied to the micro-robot to move the arm.

As the researchers switch the direction of the magnetic field back and forth, the nano swimmer's arm will rotate and move forward, just like the human crawler's arm crawling forward in the freestyle.

Eric Diller of the University of Toronto, Canada, said: "The invention is exciting because of its small size and size, and the size of the blood vessels. It is small enough to go to any body. local."

Because body fluids are more viscous than water and difficult to swim, the researchers also tested their nano swimmers in serum. The robot can only swim 5.5 microns per second, but it is still faster than other similar micro-machines.

For targeted drug delivery without invasive surgery, these nano swimmers can be coated with drugs and injected into the bloodstream, the trajectory of which can be roughly controlled by an external magnetic field.

Because of its small size, a single nano swimmer will not be able to carry enough medication to actually help. "Maybe you have to use a thousand robots," Diller said. "We have no way to track all of these robots, so there are a lot of questions about safety and toxicity."

In the future, these micromachines must be made of biodegradable materials before they can be used in the blood. However, Diller said clinical trials could begin in the next five to ten years for areas of the human body that are less complex in the urinary tract or eyeballs. Injecting a single swimmer into the eye, where it is possible to deliver the drug directly to the retina and then perform a removal procedure is much simpler than getting a group of swimming robots into the entire circulatory system.

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