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The pulses of energy vibrate the microbubbles, which loosen gaps in the barrier enough for medications to slip in.

As the researchers have now shown, these microbubbles can be guided through blood vessels.

Another benefit of the ultrasound-guided microbubbles is that they dissolve in the body once they've done their job.

Moreover, the microbubbles developed by the ETH Zurich researchers are small and smooth.

Over the past few years, Ahmed and his group have been working in the lab to develop their method for guiding microbubbles through narrow vessels.