Researchers in Hong Kong have developed an experimental nasal spray that may one day help protect the brain during a stroke before a patient even reaches the hospital.
The new technology could represent a major breakthrough in emergency stroke treatment by delivering medicine directly into the brain within minutes.
The invention was created by scientists from the University of Hong Kong’s LKS Faculty of Medicine together with the InnoHK Advanced Biomedical Instrumentation Centre.
The technology has already won international innovation awards because experts believe it could transform the treatment of stroke and other brain diseases.
The findings come at an important time because stroke remains one of the world’s biggest health problems. Every year, millions of people suffer strokes, and many survivors are left with serious disabilities involving movement, speech, memory, or thinking.
The most common form of stroke is ischemic stroke, which happens when blood flow to part of the brain becomes blocked by a clot. Brain cells begin dying very quickly once oxygen supply is interrupted.
Current medical treatments aim to reopen blocked blood vessels using clot-dissolving drugs or mechanical clot removal procedures called thrombectomy.
But there is a major problem. These treatments only work well if patients receive help very quickly. In many regions of the world, patients cannot access treatment within the narrow treatment window.
Scientists estimate that most stroke patients never receive optimal treatment in time.
The Hong Kong research team wanted to create a fast emergency treatment that could protect the brain during those critical first moments after stroke symptoms appear.
Their solution was the NanoPowder nasal spray.
The spray uses a special drug-delivery technology called “Nano-in-Micron.” Scientists spent more than a decade developing the platform.
One of the biggest obstacles in brain medicine is the blood-brain barrier. This protective barrier shields the brain from dangerous substances circulating in the blood. However, it also prevents many medicines from entering brain tissue.
As a result, many experimental brain treatments fail before they can become useful therapies.
The new spray avoids this problem by delivering medicine through the nose directly into the brain.
The spray contains microscopic powder particles carrying tiny nanoparticles filled with neuroprotective medicine. After the powder is inhaled through the nose, it settles in the nasal cavity and quickly breaks apart into nanoparticles.
These nanoparticles then travel along natural pathways connecting the nose and brain, allowing the medicine to bypass the blood-brain barrier.
This direct delivery system allows the medicine to act much faster than many traditional approaches.
Professor Aviva Chow Shing-fung, one of the lead researchers, explained that the spray was designed to be simple, portable, and easy to use in emergency situations.
The scientists hope the treatment could eventually be used in ambulances, pharmacies, or even homes to begin protecting the brain immediately after stroke symptoms appear.
Animal studies produced highly encouraging results. When the spray was given within 30 minutes after stroke onset, the amount of damaged brain tissue was reduced by more than 80%.
The treated animals also showed better neurological and motor function compared with untreated animals.
The researchers believe the spray may help reduce inflammation, prevent brain cell death, and protect the structure of the brain’s blood vessels.
Dr. Shao Zitong, another researcher involved in the project, said the spray is not meant to replace existing hospital procedures. Instead, it is intended to provide early support before patients receive full medical treatment.
This approach may be especially valuable because even short delays during a stroke can permanently damage brain tissue.
Doctors often describe stroke treatment with the phrase “time is brain” because every minute matters.
The researchers say their biggest achievement is shifting treatment from the hospital stage to the prehospital stage. Instead of waiting for patients to arrive at specialized medical centers, doctors may eventually be able to begin protecting the brain immediately.
The technology may also have applications beyond stroke.
Scientists believe the same nose-to-brain delivery system could potentially help deliver medicines for Alzheimer’s disease, motor neuron diseases, meningitis, and other neurological conditions that are difficult to treat because of the blood-brain barrier.
The next step will involve additional safety testing and clinical trials in humans.
Although the early results are exciting, experts caution that animal studies do not always translate perfectly into human treatment. Researchers must still prove the spray is safe and effective for patients.
Even so, the study highlights how advances in drug delivery technology may create completely new ways to treat brain diseases in the future.
If successful, the NanoPowder nasal spray could eventually become one of the first emergency treatments designed to protect brain tissue before patients even arrive at the hospital.
If you care about stroke, please read studies about how to eat to prevent stroke, and diets high in flavonoids could help reduce stroke risk.
For more health information, please see recent studies about how Mediterranean diet could protect your brain health, and wild blueberries can benefit your heart and brain.
Source: University of Hong Kong.
