Health
New AI-Enhanced Bandages Poised to Transform Wound Treatment
Sept. 6, 2023 — You cut yourself. You put on a bandage. In a week or so, your wound heals.
Most people take this routine for granted. But for the more than 8.2 million Americans who have chronic wounds, it’s not so simple.
Traumatic injuries, post-surgical complications, advanced age, and chronic illnesses like diabetes and vascular disease can all disrupt the delicate healing process, leading to wounds that last months or years.
Left untreated, about 30% lead to amputation. And recent studies show the risk of dying from a chronic wound complication within 5 years rivals that of most cancers.
Yet until recently, medical technology had not kept up with what experts say is a snowballing threat to public health.
“Wound care — even with all of the billions of products that are sold — still exists on kind of a medieval level,” said Geoffrey Gurtner, MD, chair of the department of surgery and professor of biomedical engineering at the University of Arizona College of Medicine. “We’re still putting on poultices and salves … and when it comes to diagnosing infection, it’s really an art. I think we can do better.”
Old-School Bandage Meets AI
Gurtner is among dozens of clinicians and researchers reimagining the humble bandage — combining cutting-edge materials science with artificial intelligence, or AI, and patient data to develop “smart bandages” that do far more than shield a wound.
Someday soon, these paper-thin bandages embedded with miniaturized electronics could monitor the healing process in real time, alerting the patient — or a doctor— when things go wrong. With the press of a smartphone button, that bandage could deliver medicine to fight an infection or an electrical pulse to stimulate healing.
Some “closed-loop” designs need no prompting, instead monitoring the wound and automatically giving it what it needs.
Others in development could halt a battlefield wound from hemorrhaging or kick-start healing in a blast wound, preventing longer-term disability.
The same technologies could — if the price is right — speed up healing and reduce scarring in minor cuts and scrapes, too, said Gurtner.
And unlike many cutting-edge medical innovations, these next-generation bandages could be made relatively cheaply and benefit some of the most vulnerable populations, including older adults, people with low incomes, and those in developing countries.
They could also save the health care system money, as the U.S. spends more than $28 billion annually treating chronic wounds.
“This is a condition that many patients find shameful and embarrassing, so there hasn’t been a lot of advocacy,” said Gurtner, outgoing board president of the Wound Healing Society. “It’s a relatively ignored problem afflicting an underserved population that has a huge cost. It’s a perfect storm.”
How Wounds Heal, or Don’t
Wound healing is one of the most complex processes in the human body.
First platelets rush to the injury, prompting blood to clot. Then immune cells emit compounds called inflammatory cytokines, helping to fight off pathogens and keep infection at bay. Other compounds, including nitric oxide, spark the growth of new blood vessels and collagen to rebuild skin and connective tissue. As inflammation slows and stops, the flesh continues to reform.
But some conditions can stall the process, often in the inflammatory stage.
In people with diabetes, high glucose levels and poor circulation tend to sabotage the process. And people with nerve damage from spinal cord injuries, diabetes, or other ailments may not be able to feel it when a wound is getting worse or reinjured.
“We end up with patients going months with open wounds that are festering and infected,” said Roslyn Rivkah Isseroff, MD, professor of dermatology at the University of California Davis and head of the VA Northern California Health Care System’s wound healing clinic. “The patients are upset with the smell. These open ulcers put the patient at risk for systemic infection, like sepsis.” It can impact mental health, draining the patient’s ability to care for their wound.
“We see them once a week and send them home and say change your dressing every day, and they say, ‘I can barely move. I can’t do this,’” said Isseroff.
Checking for infection means removing bandages and culturing the wound. That can be painful, and results take time.
A lot can happen to a wound in a week.
“Sometimes, they come back and it’s a disaster and they have to be admitted to the ER or even get an amputation,” Gurtner said.
People who are housing insecure or lack access to health care are even more vulnerable to complications.
“If you had the ability to say ‘there is something bad happening,’ you could do a lot to prevent this cascade and downward spiral.”
Bandages 2.0
In 2019, the Defense Advanced Research Projects Agency (DARPA) — the research arm of the Department of Defense — launched the Bioelectronics for Tissue Regeneration (BETR) program to encourage scientists to develop a “closed-loop” bandage capable of both monitoring and hastening healing.
Tens of millions in funding has kick-started a flood of innovation since.
“It’s kind of a race to the finish,” said Marco Rolandi, PhD, associate professor of electrical and computer engineering at the University of California Santa Cruz and the principal investigator for a team including engineers, medical doctors, and computer scientists from UC Santa Cruz, UC Davis, and Tufts. “I’ve been amazed and impressed at all the work coming out.”
His team’s goal is to cut healing time in half by using (a) real-time monitoring of how a wound is healing – using indicators like temperature, pH level, oxygen, moisture, glucose, electrical activity, and certain proteins, and (b) appropriate stimulation.
“Every wound is different, so there is no one solution,” said Isseroff, the team’s clinical lead. “The idea is that it will be able to sense different parameters unique to the wound, use AI to figure out what stage it is in, and provide the right stimulus to kick it out of that stalled stage.”
The team has developed a proof-of-concept prototype: a bandage embedded with a tiny camera that takes pictures and transmits them to a computer algorithm to assess the wound’s progress. Miniaturized battery-powered actuators, or motors, automatically deliver medication.
Phase I trials in rodents went well, Rolandi said. The team is now testing the bandage on pigs.
Across the globe, other promising developments are underway.
In a scientific paper published in May, researchers at the University of Glasgow, Scotland, described a new “low-cost, environmentally friendly” bandage embedded with light-emitting diodes (LEDs) that use ultraviolet light to kill bacteria — no antibiotics needed. The fabric is stitched with a slim, flexible coil that powers the lights without a battery using wireless power transfer. In lab studies, it eradicated gram-negative bacteria (some of the nastiest bugs) in 6 hours.
Also in May, in the journal Bioactive Materials, a Penn State team detailed a bandage with medicine-injecting microneedles that can halt bleeding immediately after injury. In lab and animal tests, it reduced clotting time from 11.5 minutes to 1.3 minutes and bleeding by 90%.
“With hemorrhaging injuries, it is often the loss of blood — not the injury itself — that causes death,” said study author Amir Sheikhi, PhD, assistant professor of chemical and biomedical engineering at Penn State. “Those 10 minutes could be the difference between life and death.”
Another smart bandage, developed at Northwestern University, harmlessly dissolves — electrodes and all — into the body after it is no longer needed, eliminating what can be a painful removal.
Guillermo Ameer, DSc, a study author reporting on the technology in Science Advances, hopes it could be made cheaply and used in developing countries.
“We’d like to create something that you could use in your home, even in a very remote village,” said Ameer, professor of biomedical engineering at Northwestern.
Timeline for Clinical Use
These are early days for the smart bandage, scientists say. Most studies have been in rodents and more work is needed to develop human-scale bandages, reduce cost, solve long-term data storage, and ensure material adheres well without irritating the skin.
But Gurtner is hopeful that some iteration could be used in clinical practice within a few years.
In May, he and colleagues at Stanford University published a paper in Nature Biotechnology describing their smart bandage. It includes a microcontroller unit, a radio antenna, biosensors, and an electrical stimulator all affixed to a rubbery, skin-like polymer (or hydrogel) about the thickness of a single coat of latex paint.
The bandage senses changes in temperature and electrical conductivity as the wound heals. And it gives electrical stimulation to accelerate healing.
Animals treated with the bandage healed 25% faster, with 50% less scarring.
Electrical currents are already used for wound healing in clinical practice, Gurtner said. Because the stimulus is already approved and the cost to make the bandage could be low (as little as $10 to $50), he believes it could be ushered through the approval processes relatively quickly.
“Is this the ultimate embodiment of all the bells and whistles that are possible in a smart bandage? No. Not yet,” he said. “But we think it will help people. And right now, that’s good enough.”
May 10, 2024 – When we’re young, we take our macula for granted. At the center of our retina – the deepest layer of the eye that’s chock-full of photoreceptors and that confers color to our world – the macula is like a high-resolution camera. As light hits our eyes, the retina’s macula recasts our world in a bloom of color with astoundingly high visual sharpness.
But as you age, your vision dulls. What once stood out sharply becomes foggy, like condensation on a windowpane. After some time, a coal-black smudge or cloudy circular area begins to affect your central vision.
This effective blind spot widens over time if left untreated. What remains is a “macular hole” in the center of your retina.
This unfortunate series of events marks the advanced stage of age-related macular degeneration, a dangerous retinal disease that affects about 20 million people in the U.S., and nearly 200 million people worldwide.
And it’s not getting better. Estimates are that by 2040, the disease may affect nearly 300 million people worldwide. We are very limited in our ability to treat or prevent it. Read on for what to know.
First, What Causes Age-Related Macular Degeneration?
AMD’s causes are varied, and whether it will affect you is mostly determined by age and genetics, said Marco Alejandro Gonzalez, MD, an ophthalmologist and vitreoretinal specialist in Delray Beach, FL.
Because of the different cocktails that we have in terms of our genetic makeup, some people’s photoreceptor cells in the macula “basically start to shut down,” he said.
AMD’s development involves over 30 genes, and if you have a first-degree relative – parent, sibling, child – who has the disease, you’re three times more likely to get it, too.
Gonzalez explained how the expected rise to 300 million cases by 2040 is due mostly to improved diagnostic tools, along with the fact that the world is getting older and living longer. (Usually, an optometrist can detect signs of AMD during a routine eye exam.)
Eye experts still struggle to stop AMD’s most harmful sign – the cause of those muddy, milky, or even coal-colored circles in your central vision: geographic atrophy.
Geographic atrophy can occur in either of the two forms of age-related AMD: “dry” AMD and “wet” AMD.
Nearly every case of AMD begins as the dry kind, affecting 80% to 90% of AMD patients.
Retinal disease expert Tiarnán Keenan, MD, PhD, offered a vivid image of geographic atrophy for those who have dry AMD.
“As time passes, the circular patches of GA expand like a brushfire, taking more and more vision with it, often to the point of legal blindness,” he said.
A researcher in the Division of Epidemiology and Clinical Applications at the National Eye Institute, Keenan recently led a study that tested the efficacy of the antibiotic minocycline in slowing geographic atrophy expansion in dry AMD. The study operated on the grounds that the body’s immune system could be at play in developing the disease.
When your body’s immune system is overactive, microglial cells (central nervous system immune cells) can get into the sub-retinal space and possibly eat away at the macula and its sensitive photoreceptors.
Though minocycline had been shown to reduce inflammation and microglial activity in the eye in diabetic retinopathy, it didn’t slow the expansion of geographic atrophy or vision loss in patients with dry AMD during Keenan’s study.
When asked if microglial activity could have very little to do with the atrophy expansion, Keenan said it’s something to consider: “Maybe microglia are just there as bystanders clearing up the debris … so inhibiting them is less likely to slow down progression.”
In future drug trials, “maybe it’s possible the minocycline or another approach to target microglia would be helpful, but it would be needed in combination with some other therapy and be ineffective by itself,” he said.
Two Sides of the Same Disease
In dry AMD, Gonzalez compares macular degeneration to the loss of pixels on a screen. “Some of those pixels burn out … and that’s the way you lose vision classically in the dry form.”
Wet AMD is a more progressive form of the disease. It causes abrupt vision loss due to abnormal blood vessel growth.
“If you don’t treat wet AMD quickly, it’s game over,” warned Gonzalez. “Wet macular degeneration is the quicker process of vision loss because these blood vessels wreak havoc.” These new blood vessels bleed, causing fluid to build in the macula, which ultimately leads to scarring.
Gonzalez shed light on why wet AMD develops. “The wet form, for some reason, is the body’s last-ditch effort to try to kind of ‘help’ a dying macula. … When these blood vessels start to grow under the retina, they quickly destroy the architecture of the macula.”
Stopping the Bleeding in Wet AMD
Though wet AMD is rarer, it’s more treatable than dry AMD. Signs and symptoms can be eased with various therapies injected into the eye.
Putting it simply, Gonzalez said these therapies to treat wet AMD “all basically do the same thing. They make these new blood vessels regress temporarily before they cause damage to the macula.”
The injected medication clears away those blood vessels and restores the architecture of the macula. People can recover some vision in this way, but it’s only a temporary tune-up, and shots must be given as often as once a month.
“Degeneration of the cells is still the main problem. You’re not stopping that. But degeneration itself is a lot slower than actual vision loss associated with these blood vessels.”
The Struggle in Developing New Treatments
According to Keenan, “nobody has been able to stop geographic atrophy from happening” in either form of AMD. “So, that’s the main work in the field with trials.”
In December 2023, the FDA approved two new drugs: Syfovre and Izervay, both of which only slow geographic atrophy. Degeneration still happens, regardless.
Keenan explained how these two new drugs are “complement inhibitors … given by injection into the eye once a month or so.”
“Complement” refers to the body’s complement pathway, a trigger that activates a cascade of proteins in enhancing immune response.
Clinical trials showed Syfovre slowing the rate of geographic atrophy by up to 22% over 2 years, and Izervay up to 14% over 1 year.
Though these drugs are a new weapon against this troublesome affliction, they aren’t without their complications.
“Anytime you give an injection in the eye, there’s always the risk of an infection because you’re introducing something from the outside. So that’s the biggest risk,” explained Gonzalez.
An infection is uncommon, but potentially devastating, as you can lose your eye altogether. There’s also the chance of a damaging reaction to the shot.
“You have to pick and choose your patients,” said Gonzalez. “Not everybody is a good candidate for those new shots … and the patient is never going to see better. … It’s a harder sell than the ones for wet AMD.”
A Common Protective Measure
Keenan and Gonzalez both have a fair degree of confidence in reducing the risk of AMD with vitamin therapy.
As a bit of background on how vitamins were found to act as a sort of preventive measure, Gonzalez said, “In the early and late ‘90s, there were series of studies which were called the age-related eye disease studies.” These are now referred to as AREDS 1 and AREDS 2.
Researchers proved that a certain cocktail of vitamins slowed down degeneration. The most is a combo of antioxidants: vitamins C and E and lutein and zeaxanthin, all of which are in the AREDS 2 formula.
People who took these vitamins had a lower chance of losing their vision over the next 2 to 5 years. “[The combo] seems to be complementary and additive … with a combined treatment effect of 55% to 60%, an excellent safety record, and very low cost,” Keenan said.
Gonzalez recommends the AREDS 2 formula of vitamins to every patient of his. “It’s such an easy thing to take, and the downside is minimal.”
Unfortunately, if your genes make you more likely to have the condition, a change in diet or vitamin use could have no effect.
Dire? Possibly. But not all is lost in this fight.
Vigilance with AMD and What to Do Next if You’re Diagnosed
Gonzalez is adamant in educating his patients before time has run out on treating AMD. Recognition is key. “The most common reason a lot of these people get to me ‘too late’ is they don’t realize there’s a problem.”
He explained a typical scenario: “Let’s say you have macular degeneration in both eyes at different stages. One of your eyes starts developing wet macular degeneration … so the better eye takes over and you may not notice there’s a problem.”
Even after a patient is diagnosed with AMD, they usually see a specialist only twice a year. Gonzalez often tells his patients to cover one of their eyes to make sure their vision is intact in both eyes. “You’ll be able to pick up on subtle differences” in each eye, he said.
This type of self-care and vigilance can be the difference between successfully living with and treating the disease for the rest of your life, and trying to get help when it’s simply too late.
For wet AMD, as mentioned before, a round of injections is basically what everyone does. Without quick, invasive treatment, the point of no return approaches rapidly.
May 16, 2024 – Multiple U.S. agencies are working to contain the recent bird flu outbreak among cattle to prevent further spread to humans (beyond one case reported in early April) and use what we learned before, during, and after the COVID-19 pandemic to keep farm workers and the general public safe.
Fingers crossed, the bird flu will be contained and peter out. Or the outbreak could continue to spread among dairy cattle and other animals, threatening the health and livelihoods of farmers and others who work with livestock.
Or the virus could change in a way that makes it easier to infect and spread among people. If this happens, the worst-case scenario could be a new influenza pandemic.
With so many unknowns, WebMD brought together experts from four federal agencies to talk prevention, monitoring, and what the “what ifs” of bird flu might look like.
Communication with the public “about what we know, what we don’t know, and ways you and your family can stay safe is a priority for us at CDC,” said Nirav D. Shah, MD, JD, the CDC’s principal deputy director. “We at the federal level are responding, and we want the public to be following along.”
People should consult the websites for the CDC, FDA, U.S. Department of Agriculture (USDA), and the Administration for Strategic Preparedness and Response (ASPR) for updates.
It is essential to not only stay informed, but to seek trusted sources of information, Shah said during “Bird Flu 2024 – What You Need to Know,” an online briefing jointly sponsored by the CDC and WebMD.
An ‘Experimental Hamburger’
If one take-home message emerged from the event, it was that the threat to the general public remains low.
The retail milk supply is safe, although consuming raw or unpasteurized milk is not recommended. “While commercial milk supply is safe, we strongly advise against drinking raw milk,” said Donald A. Prater, DVM, acting director for the FDA’s Center for Food Safety and Applied Nutrition.
As for other foods, thoroughly cooked eggs are less risky than raw eggs, and the nation’s beef supply remains free of the virus as well.
For years, federal inspectors have purchased and tested meat at retail stores, said Eric Deeble, DVM, USDA deputy assistant secretary for the Office of Congressional Relations. So far, H5N1, the virus behind bird flu, has not been detected in beef.
The USDA took testing a step further and recently cooked ground beef from dairy cows in their lab. Using what Deeble described as an “experimental hamburger,” the agency showed cooking beef to 165 F or higher kills the virus if it ever becomes necessary.
The federal government now requires all cattle be tested and be free of bird flu virus before crossing any state lines. The government is also reimbursing farmers for veterinary care and loss of business related to the outbreak, and supply personal protective equipment (PPE) like gloves, masks, and face shields to workers.
Vaccination Not Recommended Now
Federal scientists know enough about H5N1 virus to create vaccines against it quickly if the need arises. It’s more about planning ahead at this point. “Vaccines are not part of our response right now,” said David Boucher, PhD, director of infectious diseases preparedness and response at the Administration for Strategic Preparedness and Response.
If the virus changes and becomes a bigger threat to people, “we have the building blocks to produce a vaccine,” Boucher added.
An event attendee asked if the seasonal flu shot offers any protection. “Unfortunately, the flu shot you got last year does not provide great protection from the avian flu,” Shah responded. “It might do a little bit … but that is the vaccine for seasonal flu. This is something more novel.”
Treatments Stockpiled and Ready
Antiviral medications, which if given early in the course of bird flu infection could shorten the severity or duration of illness, are available now, Shah said. The dairy farmer who was infected with bird flu earlier this year responded to oseltamivir (Tamiflu) treatment, for example.
When it comes to bird flu symptoms, the fact that the only infected person reported so far this year developed pink eye, also known as conjunctivitis, is interesting, Shah said. Officials would have expected to see more typical seasonal flu symptoms, he added.
“Influenza is not a new virus,” Boucher said. “With this strain of influenza, we are not seeing any genetic markers associated with resistance to antivirals. That means the antivirals we take for seasonal influenza would also be available if needed to treat H5N1.”
ASPR has stockpiled Tamiflu and three other antivirals. “We do have tens of millions of courses that can be distributed around the country if we need them,” he added.
“Influenza is an enemy we know well,” Boucher said. That is why “we have antivirals ready to go now and many types of PPE.”
Science in Action
The feds intend to stay on the case. They will continue to monitor emergency department visits, lab test orders, and wastewater samples for any changes suggesting a human pandemic risk is growing.
“While we’ve learned a great deal, there are still many things we do not know,” Deeble said.
Shah added, “As in any outbreak, this is an evolving situation and things can change. What you are seeing now is science in action.”
For the latest updates on bird flu in the United States, visit the CDC’s H5N1 Bird Flu: Current Situation Summary website.
May 16, 2024 – Multiple U.S. agencies are working to contain the recent bird flu outbreak among cattle to prevent further spread to humans (beyond one case reported in early April) and use what we learned before, during, and after the COVID-19 pandemic to keep farm workers and the general public safe.
Fingers crossed, the bird flu will be contained and peter out. Or the outbreak could continue to spread among dairy cattle and other animals, threatening the health and livelihoods of farmers and others who work with livestock.
Or the virus could change in a way that makes it easier to infect and spread among people. If this happens, the worst-case scenario could be a new influenza pandemic.
With so many unknowns, WebMD brought together experts from four federal agencies to talk prevention, monitoring, and what the “what ifs” of bird flu might look like.
Communication with the public “about what we know, what we don’t know, and ways you and your family can stay safe is a priority for us at CDC,” said Nirav D. Shah, MD, JD, the CDC’s principal deputy director. “We at the federal level are responding, and we want the public to be following along.”
People should consult the websites for the CDC, FDA, U.S. Department of Agriculture (USDA), and the Administration for Strategic Preparedness and Response (ASPR) for updates.
It is essential to not only stay informed, but to seek trusted sources of information, Shah said during “Bird Flu 2024 – What You Need to Know,” an online briefing jointly sponsored by the CDC and WebMD.
An ‘Experimental Hamburger’
If one take-home message emerged from the event, it was that the threat to the general public remains low.
The retail milk supply is safe, although consuming raw or unpasteurized milk is not recommended. “While commercial milk supply is safe, we strongly advise against drinking raw milk,” said Donald A. Prater, DVM, acting director for the FDA’s Center for Food Safety and Applied Nutrition.
As for other foods, thoroughly cooked eggs are less risky than raw eggs, and the nation’s beef supply remains free of the virus as well.
For years, federal inspectors have purchased and tested meat at retail stores, said Eric Deeble, DVM, USDA deputy assistant secretary for the Office of Congressional Relations. So far, H5N1, the virus behind bird flu, has not been detected in beef.
The USDA took testing a step further and recently cooked ground beef from dairy cows in their lab. Using what Deeble described as an “experimental hamburger,” the agency showed cooking beef to 165 F or higher kills the virus if it ever becomes necessary.
The federal government now requires all cattle be tested and be free of bird flu virus before crossing any state lines. The government is also reimbursing farmers for veterinary care and loss of business related to the outbreak, and supply personal protective equipment (PPE) like gloves, masks, and face shields to workers.
Vaccination Not Recommended Now
Federal scientists know enough about H5N1 virus to create vaccines against it quickly if the need arises. It’s more about planning ahead at this point. “Vaccines are not part of our response right now,” said David Boucher, PhD, director of infectious diseases preparedness and response at the Administration for Strategic Preparedness and Response.
If the virus changes and becomes a bigger threat to people, “we have the building blocks to produce a vaccine,” Boucher added.
An event attendee asked if the seasonal flu shot offers any protection. “Unfortunately, the flu shot you got last year does not provide great protection from the avian flu,” Shah responded. “It might do a little bit … but that is the vaccine for seasonal flu. This is something more novel.”
Treatments Stockpiled and Ready
Antiviral medications, which if given early in the course of bird flu infection could shorten the severity or duration of illness, are available now, Shah said. The dairy farmer who was infected with bird flu earlier this year responded to oseltamivir (Tamiflu) treatment, for example.
When it comes to bird flu symptoms, the fact that the only infected person reported so far this year developed pink eye, also known as conjunctivitis, is interesting, Shah said. Officials would have expected to see more typical seasonal flu symptoms, he added.
“Influenza is not a new virus,” Boucher said. “With this strain of influenza, we are not seeing any genetic markers associated with resistance to antivirals. That means the antivirals we take for seasonal influenza would also be available if needed to treat H5N1.”
ASPR has stockpiled Tamiflu and three other antivirals. “We do have tens of millions of courses that can be distributed around the country if we need them,” he added.
“Influenza is an enemy we know well,” Boucher said. That is why “we have antivirals ready to go now and many types of PPE.”
Science in Action
The feds intend to stay on the case. They will continue to monitor emergency department visits, lab test orders, and wastewater samples for any changes suggesting a human pandemic risk is growing.
“While we’ve learned a great deal, there are still many things we do not know,” Deeble said.
Shah added, “As in any outbreak, this is an evolving situation and things can change. What you are seeing now is science in action.”
For the latest updates on bird flu in the United States, visit the CDC’s H5N1 Bird Flu: Current Situation Summary website.
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