Vytautas Ostaševičius and his team at Kaunas University of Technology made an unexpected discovery: the same sound waves doctors use to peek inside the human body can also be harnessed to improve how blood flows through our veins. For decades, ultrasound has been confined to the diagnostic realm—grainy images on a monitor, a snapshot of a developing baby, a routine scan in a hospital. But KTU researchers have cracked open a new possibility, one that could reshape how we treat heart disease, Alzheimer's, and diabetes without reaching for a scalpel or a prescription bottle.
The breakthrough centers on red blood cells, which naturally tend to clump together in reversible clusters called aggregates. This clustering matters enormously because it thickens the blood and chokes off oxygen exchange—imagine traffic slowing to a crawl when cars bunch too tightly together. High-frequency ultrasound, the researchers found, actually makes this problem worse, driving red blood cells toward low-pressure regions and forcing them to aggregate. But low-frequency ultrasound does the opposite: it generates traveling acoustic waves that create shear forces powerful enough to separate clustered cells back into single units.
"When erythrocytes cluster together under the influence of high-frequency ultrasound, blood viscosity increases, blood pressure and pulse may rise, and oxygen exchange becomes less efficient," explains Ostaševičius, director of the KTU Institute of Mechatronics and lead author of the study, published in the journal Sensors. What stunned the researchers was that this dissociation effect—breaking apart red blood cell clusters with low-frequency ultrasound—had never been demonstrated before. When those cells separate, gaps open between them, blood flows more freely, and the entire surface of each cell can participate in oxygen delivery throughout the body.
The research journey began during the COVID-19 pandemic, when Ostaševičius and his colleagues urgently sought non-invasive ways to help patients battling severe respiratory complications. Could ultrasound somehow intensify the interaction between hemoglobin and oxygen in the lungs? To test the idea, the team exposed hundreds of blood samples to ultrasound of varying intensities, methodically mapping how erythrocytes respond. The work revealed something remarkable: they designed a low-frequency ultrasound transducer capable of penetrating biological tissues roughly four times deeper than conventional devices. This innovation is now protected by international patent.
Though still in early research stages, the potential applications ripple across medicine. Ostaševičius and his colleagues are exploring whether improved oxygen delivery could enhance cancer therapy—tumors are notoriously oxygen-starved, and this limitation often blocks treatment effectiveness. The same technology might someday support Alzheimer's treatment, where blood circulation and oxygen supply to brain tissue play crucial roles. For patients with diabetes, improved microcirculation could mean better oxygen exchange in tissues that often suffer from circulatory compromise.
The road from laboratory breakthrough to bedside is always long, but what began as a pandemic-era scramble for non-invasive solutions has opened a door. If low-frequency ultrasound can be safely translated to clinical use, it could transform treatment for diseases where oxygen delivery and blood flow are the hidden culprits. The researchers have already proven the science works. Now comes the harder work of bringing it to patients.