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Hair-Sized Fiber-Optic Probe Can Measure Temperatures Deep Inside the Body

April 16th, 2018 Conn Hastings Materials, Medicine, Oncology

Researchers at the University of Adelaide have developed a tiny fiber-optic probe that can measure temperatures deep inside the body, while imaging structures in the region of interest. The probe, which has a similar thickness to a human hair, could help researchers to investigate the effects of drugs that raise temperatures in specific parts of the body, or optimize thermal treatments for cancers. Because the probe is so thin, it is minimally invasive and could also help researchers to record other types of physiological data.

The research team wanted to develop a way to find better treatments for drug-induced brain overheating. “Using some drugs such as ecstasy can make certain brain regions overheat and then become damaged,” said Jiawen Li, a researcher involved in the study. To do this, the team needed to precisely measure temperatures in specific brain regions.

Their solution is an ultra-thin fiber-optic probe with a lens at its tip. To allow it to measure temperature, the probe includes a layer of rare-earth-doped tellurite glass. The lens can perform optical coherence tomography imaging, while the probe simultaneously senses temperature.

“With an outer diameter of only 130 microns, the probe is as thin as a single strand of human hair,” said Li. “This means it can be delivered deep inside the body in a minimally invasive way. It also allows us to see and record physiological data in real time that we weren’t able to access before.”

The research team has tested the probe’s sensing capabilities in rat brains. In the future, they hope to study the hyperthermic effects of drugs in the brain, with a view to developing new treatments. Other applications include optimizing hyperthermic treatments used to destroy solid tumors.

While this first-generation probe can image tissue and sense temperature, the researchers hope that future versions may be able to make other measurements, such as oxygen saturation and pH, allowing insight into a wider array of disease states.

Study in Optics Letters: Miniaturized single-fiber-based needle probe for combined imaging and sensing in deep tissue…

Via: University of Adelaide…

Conn Hastings

Conn Hastings received a PhD from the Royal College of Surgeons in Ireland for his work in drug delivery, investigating the potential of injectable hydrogels to deliver cells, drugs and nanoparticles in the treatment of cancer and cardiovascular diseases. After achieving his PhD and completing a year of postdoctoral research, Conn pursued a career in academic publishing, before becoming a full-time science writer and editor, combining his experience within the biomedical sciences with his passion for written communication.

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