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Lancing tumours into the body

ody, Ishiyama says the devices could carry drugs to the sites of infection. His latest prototype is even armed with a tiny metal spike that heats up when you apply a second magnetic field vibrating at 100 kHz.

The hot spike could be useful for destroying cancerous tissue, Ishiyama believes. The high frequency field used to heat the metal tip doesn’t interfere with steering the device, he adds.Says Edwin Jager at Linkoping University in Sweden, who is designing tiny robots to manipulate single cells in the body that “surgeons are understandably cautious about the idea of microbots floating free in the body.

If one blocked a blood vessel,” for example, it could be disastrous.He also says that Ishiyama’s prototypes might be too long to safely navigate some of the tighter turns in blood vessels.While Ishiyama concedes that his swimming machines won’t replace standard tools such as catheters for medical operations any time soon, he thinks that nanobots even smaller than this could have a distinct advantage.

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