̽��ֱ�� of Cambridge - George Malliaras

Cambridge researchers developing brain implants for treating Parkinson’s disease

sc604 — Thu, 23 Jan 2025 10:33:21 +0000

As part of a £69 million funding programme supported by the Advanced Research + Invention Agency (ARIA), Professor George Malliaras from Cambridge’s Department of Engineering will co-lead a project that uses small clusters of brain cells called midbrain organoids to develop a new type of brain implant, which will be tested in animal models of Parkinson’s disease.

̽��ֱ��project led by Malliaras and Professor Roger Barker from the Department of Clinical Neurosciences, which involves colleagues from the ̽��ֱ�� of Oxford, the ̽��ֱ�� of Lund and BIOS Health, is one of 18 projects funded by ARIA as part of its Precision Neurotechnologies programme, which is supporting research teams across academia, non-profit R&D organisations, and startups dedicated to advancing brain-computer interface technologies.

̽��ֱ��programme will direct £69 million over four years to unlock new methods for interfacing with the human brain at the neural circuit level, to treat many of the most complex neurological and neuropsychiatric disorders, from Alzheimer’s to epilepsy to depression.

By addressing bottlenecks in funding and the lack of precision offered by current approaches, the outputs of this programme will pave the way for addressing a much broader range of conditions than ever before, significantly reducing the social and economic impact of brain disorders across the UK.

Parkinson’s disease occurs when the brain cells that make dopamine (a chemical that helps control movement) die off, causing movement problems and other symptoms. Current treatments, like dopamine-based drugs, work well early on, but can cause serious side effects over time.

In the UK, 130,000 people have Parkinson’s disease, and it costs affected families about £16,000 per year on average – more than £2 billion in the UK annually. As more people age, the number of cases will grow, and new treatments are urgently needed.

One idea is to replace the lost dopamine cells by transplanting new ones into the brain. But these cells need to connect properly to the brain’s network to fix the problem, and current methods don’t fully achieve that.

In the ARIA-funded project, Malliaras and his colleagues are working on a new approach using small clusters of brain cells called midbrain organoids. These will be placed in the right part of the brain in an animal model of Parkinson’s disease. They’ll also use advanced materials and electrical stimulation to help the new cells connect and rebuild the damaged pathways.

“Our ultimate goal is to create precise brain therapies that can restore normal brain function in people with Parkinson’s,” said Malliaras.

“To date, there’s been little serious investment into methodologies that interface precisely with the human brain, beyond ‘brute force’ approaches or highly invasive implants,” said ARIA Programme Director Jacques Carolan. “We’re showing that it’s possible to develop elegant means of understanding, identifying, and treating many of the most complex and devastating brain disorders. Ultimately, this could deliver transformative impact for people with lived experiences of brain disorders.”

Other teams funded by the programme include one at Imperial College London who is developing an entirely new class of biohybridised technology focused on engineering transplanted neurons with bioelectric components. A Glasgow-led team will build advanced neural robots for closed-loop neuromodulation, specifically targeting epilepsy treatment, while London-based Navira will develop a technology for delivering gene therapies across the blood-brain barrier, a crucial step towards developing safer and more effective treatments.

Adapted from an ARIA media release.

Cambridge researchers are developing implants that could help repair the brain pathways damaged by Parkinson’s disease.

Our ultimate goal is to create precise brain therapies that can restore normal brain function in people with Parkinson’s

George Malliaras

Science Photo Library via Getty Images

Substantia nigra in the human brain, illustration

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Yes

Cambridge joins forces with ARIA to fast-track radical new technologies to revolutionise brain health

Anonymous — Wed, 09 Oct 2024 12:57:22 +0000

̽��ֱ��collaboration, which includes researchers from the ̽��ֱ�� of Cambridge, aims to accelerate progress on new neuro-technologies, including miniaturised brain implants designed to treat depression, dementia, chronic pain, epilepsy and injuries to the nervous system.

Neurological and mental health disorders will affect four in every five people in their lifetimes, and present a greater overall health burden than cancer and cardiovascular disease combined. For example, 28 million people in the UK are living with chronic pain and 1.3 million people with traumatic brain injury.

Neuro-technology – where technology is used to control the nervous system - has the potential to deliver new treatments for these disorders, in much the same way that heart pacemakers, cochlear implants and spinal implants have transformed medicine in recent decades.

̽��ֱ��technology can be in the form of electronic brain implants that reset abnormal brain activity or help deliver targeted drugs more effectively, brain-computer interfaces that control prosthetic limbs, or technologies that train the patient’s own cells to fight disease. ARIA’s Scalable Neural Interfaces opportunity space is exploring ways to make the technology more precise, less invasive, and applicable to a broader range of diseases.

Currently, an implant can only interact with large groups of neurons, the cells that transmit information around the brain. Building devices that interact with single neurons will mean a more accurate treatment. Neuro-technologies also have the potential to treat autoimmune disorders, including rheumatoid arthritis, Crohn’s disease and type-1 diabetes.

̽��ֱ��science of building technology small enough, precise enough and cheap enough to make a global impact requires an environment where the best minds from across the UK can collaborate, dream up radical, risky ideas and test them without fear of failure.

Professor George Malliaras from the ̽��ֱ�� of Cambridge’s Department of Engineering is one of the project leaders. “Miniaturised devices have the potential to change the lives of millions of people currently suffering from neurological conditions and diseases where drugs have no effect,” he said. “But we are working at the very edge of what is possible in medicine, and it is hard to find the support and funding to try radical, new things. That is why the partnership with ARIA is so exhilarating, because it is giving brilliant people the tools to turn their original ideas into commercially viable devices that are cheap enough to have a global impact.”

Cambridge’s partnership with ARIA will create a home for original thinkers who are struggling to find the funding, space and mentoring needed to stress-test their radical ideas. ̽��ֱ��three-year partnership is made up of two programmes:

̽��ֱ��Fellowship Programme (up to 18 fellowships)

Blue Sky Fellows – a UK-wide offer - we will search the UK for people from any background, with a radical idea in this field and the plan and personal skills to develop it. ̽��ֱ��best people will be offered a fellowship with the funding to test their ideas in Cambridge rapidly. These Blue Sky Fellows will receive mentorship from our best medical, scientific and business experts and potentially be offered accommodation at a Cambridge college. We will be looking for a specific type of person to be a Blue Sky Fellow. They must be the kind of character who thinks at the very edge of the possible, who doesn’t fear failure, and whose ideas have the potential to change billions of lives, yet would struggle to find funding from existing sources. Not people who think outside the box, more people who don’t see a box at all.

Activator Fellows - a UK-wide offer - those who have already proved that their idea can work, yet need support to turn it into a business, will be invited to become Activator Fellows. They will be offered training in entrepreneurial skills including grant writing, IP management and clinical validation, so their innovation can be ready for investment.

̽��ֱ��Ecosystem Programme

̽��ֱ��Ecosystem Programme is about creating a vibrant, UK-wide neurotechnology community where leaders from business, science, engineering, academia and the NHS can meet, spark ideas and form collaborations. This will involve quarterly events in Cambridge, road trip events across the UK and access to the thriving online Cambridge network, Connect: Health Tech.

“This unique partnership is all about turning radical ideas into practical, low-cost solutions that change lives,” said Kristin-Anne Rutter, Executive Director of Cambridge ̽��ֱ�� Health Partners. “Cambridge is fielding its best team to make this work and using its networks to bring in the best people from all over the UK. From brilliant scientists to world-leading institutes, hospitals and business experts, everyone in this collaboration is committed to the ARIA partnership because, by working together, we all see an unprecedented opportunity to make a real difference in the world.”

“Physical and mental illnesses and diseases that affect the brain such as dementia are some of the biggest challenges we face both as individuals and as a society,” said Dr Ben Underwood, Associate Professor of Psychiatry at the ̽��ֱ�� of Cambridge and Honorary Consultant Psychiatrist at Cambridgeshire and Peterborough NHS Foundation Trust. “This funding will bring together different experts doing things at the very limits of science and developing new technology to improve healthcare. We hope this new partnership with the NHS will lead to better care and treatment for people experiencing health conditions.”

Cambridge partners in the project include the Departments of Engineering and Psychiatry, Cambridge Neuroscience, the Milner Therapeutics Institute, the Maxwell Centre, Cambridge ̽��ֱ�� Health Partners (CUHP), Cambridge Network, the Babraham Research Campus, Cambridgeshire and Peterborough NHS Foundation Trust, and Vellos.

A team from across the Cambridge life sciences, technology and business worlds has announced a multi-million-pound, three-year collaboration with the Advanced Research and Invention Agency (ARIA), the UK government’s new research funding agency.

Science Photo Library via Getty Images

Illustration of human brain

Yes

Soft, stretchy ‘jelly batteries’ inspired by electric eels

sc604 — Wed, 17 Jul 2024 18:00:00 +0000

̽��ֱ��researchers, from the ̽��ֱ�� of Cambridge, took their inspiration from electric eels, which stun their prey with modified muscle cells called electrocytes.

Like electrocytes, the jelly-like materials developed by the Cambridge researchers have a layered structure, like sticky Lego, that makes them capable of delivering an electric current.

̽��ֱ��self-healing jelly batteries can stretch to over ten times their original length without affecting their conductivity – the first time that such stretchability and conductivity has been combined in a single material. ̽��ֱ��results are reported in the journal Science Advances.

̽��ֱ��jelly batteries are made from hydrogels: 3D networks of polymers that contain over 60% water. ̽��ֱ��polymers are held together by reversible on/off interactions that control the jelly’s mechanical properties.

̽��ֱ��ability to precisely control mechanical properties and mimic the characteristics of human tissue makes hydrogels ideal candidates for soft robotics and bioelectronics; however, they need to be both conductive and stretchy for such applications.

“It’s difficult to design a material that is both highly stretchable and highly conductive, since those two properties are normally at odds with one another,” said first author Stephen O’Neill, from Cambridge’s Yusuf Hamied Department of Chemistry. “Typically, conductivity decreases when a material is stretched.”

“Normally, hydrogels are made of polymers that have a neutral charge, but if we charge them, they can become conductive,” said co-author Dr Jade McCune, also from the Department of Chemistry. “And by changing the salt component of each gel, we can make them sticky and squish them together in multiple layers, so we can build up a larger energy potential.”

Conventional electronics use rigid metallic materials with electrons as charge carriers, while the jelly batteries use ions to carry charge, like electric eels.

̽��ֱ��hydrogels stick strongly to each other because of reversible bonds that can form between the different layers, using barrel-shaped molecules called cucurbiturils that are like molecular handcuffs. ̽��ֱ��strong adhesion between layers provided by the molecular handcuffs allows for the jelly batteries to be stretched, without the layers coming apart and crucially, without any loss of conductivity.

̽��ֱ��properties of the jelly batteries make them promising for future use in biomedical implants, since they are soft and mould to human tissue. “We can customise the mechanical properties of the hydrogels so they match human tissue,” said Professor Oren Scherman, Director of the Melville Laboratory for Polymer Synthesis, who led the research in collaboration with Professor George Malliaras from the Department of Engineering. “Since they contain no rigid components such as metal, a hydrogel implant would be much less likely to be rejected by the body or cause the build-up of scar tissue.”

In addition to their softness, the hydrogels are also surprisingly tough. They can withstand being squashed without permanently losing their original shape, and can self-heal when damaged.

̽��ֱ��researchers are planning future experiments to test the hydrogels in living organisms to assess their suitability for a range of medical applications.

̽��ֱ��research was funded by the European Research Council and the Engineering and Physical Sciences Research Council (EPSRC), part of UK Research and Innovation (UKRI). Oren Scherman is a Fellow of Jesus College, Cambridge.

Reference:
Stephen J.K. O’Neill et al. ‘Highly Stretchable Dynamic Hydrogels for Soft Multilayer Electronics.’ Science Advances (2024). DOI: 10.1126/sciadv.adn5142

Researchers have developed soft, stretchable ‘jelly batteries’ that could be used for wearable devices or soft robotics, or even implanted in the brain to deliver drugs or treat conditions such as epilepsy.

Scherman Lab

Jelly batteries

Yes

Ten Cambridge scientists elected as Fellows of the Royal Society 2024

Anonymous — Thu, 16 May 2024 08:51:02 +0000

̽��ֱ��Royal Society is a self-governing Fellowship of many of the world’s most distinguished scientists drawn from all areas of science, engineering and medicine.

̽��ֱ��Society’s fundamental purpose, as it has been since its foundation in 1660, is to recognise, promote and support excellence in science and to encourage the development and use of science for the benefit of humanity.

This year, over 90 researchers, innovators and communicators from around the world have been elected as Fellows of the Royal Society for their substantial contribution to the advancement of science. Nine of these are from the ̽��ֱ�� of Cambridge.

Sir Adrian Smith, President of the Royal Society said: “I am pleased to welcome such an outstanding group into the Fellowship of the Royal Society.

“This new cohort have already made significant contributions to our understanding of the world around us and continue to push the boundaries of possibility in academic research and industry.

“From visualising the sharp rise in global temperatures since the industrial revolution to leading the response to the Covid-19 pandemic, their diverse range of expertise is furthering human understanding and helping to address some of our greatest challenges. It is an honour to have them join the Fellowship.”

̽��ֱ��Fellows and Foreign Members join the ranks of Stephen Hawking, Isaac Newton, Charles Darwin, Albert Einstein, Lise Meitner, Subrahmanyan Chandrasekhar and Dorothy Hodgkin.

̽��ֱ��new Cambridge fellows are:

Professor Sir John Aston Kt FRS

Aston is the Harding Professor of Statistics in Public Life at the Statistical Laboratory, Department of Pure Mathematics and Mathematical Statistics, where he develops techniques for public policy and improves the use of quantitative methods in public policy debates.

From 2017 to 2020 he was the Chief Scientific Adviser to the Home Office, providing statistical and scientific advice to ministers and officials, and was involved in the UK’s response to the Covid pandemic. He was knighted in 2021 for services to statistics and public policymaking, and is a Fellow of Churchill College.

Professor Sarah-Jayne Blakemore FBA FMedSci FRS

Blakemore is the Professor of Psychology and Cognitive Neuroscience, Department of Psychology, and leader of the Developmental Cognitive Neuroscience Group. Her research focuses on the development of social cognition and decision making in the human adolescent brain, and adolescent mental health.

Blakemore has been awarded several national and international prizes for her research, and is a Fellow of the British Academy, the American Association of Psychological Science and the Academy of Medical Sciences.

Professor Patrick Chinnery FMedSci FRS

Chinnery is Professor of Neurology and head of the ̽��ֱ��’s Department of Clinical Neurosciences, and a Fellow of Gonville & Caius College. He was appointed Executive Chair of the Medical Research Council last year, having previously been MRC Clinical Director since 2019.

His principal research is the role of mitochondria in human disease and developing new treatments for mitochondrial disorders. Chinnery is a Wellcome Principal Research Fellow with a lab based in the MRC Mitochondrial Biology Unit and jointly chairs the NIHR BioResource for Translational Research in Common and Rare Diseases. He is a Fellow of the Academy of Medical Sciences.

Professor Rebecca Fitzgerald OBE FMedSci FRS

Fitzgerald is Professor of Cancer Prevention in the Department of Oncology and the inaugural Director of the ̽��ֱ��’s new Early Cancer Institute, which launched in 2022. She is a Fellow of Trinity College.

Her pioneering work to devise a first-in-class, non-endoscopic capsule sponge test for identifying individuals at high risk for oesophageal cancer has won numerous prizes, including the Westminster Medal, and this test is now being rolled out in the NHS and beyond by her spin-out Cyted Ltd.

Professor David Hodell FRS

Hodell is the Woodwardian Professor of Geology and Director of the Godwin Laboratory for Palaeoclimate Research in the Department of Earth Sciences, and a Fellow of Clare College.

A marine geologist and paleoclimatologist, his research focuses on high-resolution paleoclimate records from marine and lake sediments, as well as mineral deposits, to better understand past climate dynamics. Hodell is a fellow of the American Geophysical Union and the American Association for the Advancement of Science. He has received the Milutin Milankovic Medal.

Professor Eric Lauga FRS

Lauga is Professor of Applied Mathematics in the Department of Applied Mathematics and Theoretical Physics, where his research is in fluid mechanics, biophysics and soft matter. Lauga is the author, or co-author, of over 180 publications and currently serves as Associate Editor for the journal Physical Review Fluids.

He is a recipient of three awards from the American Physical Society: the Andreas Acrivos Dissertation Award in Fluid Dynamics, the François Frenkiel Award for Fluid Mechanics and the Early Career Award for Soft Matter Research. He is a Fellow of the American Physical Society and of Trinity College.

Professor George Malliaras FRS

Malliaras is the Prince Philip Professor of Technology in the Department of Engineering, where he leads a group that works on the development and translation of implantable and wearable devices that interface with electrically active tissues, with applications in neurological disorders and brain cancer.

Research conducted by Malliaras has received awards from the European Academy of Sciences, the New York Academy of Sciences, and the US National Science Foundation among others. He is a Fellow of the Materials Research Society and of the Royal Society of Chemistry.

Professor Lloyd Peck FRI FRSB FRS

Peck is a marine biologist at the British Antarctic Survey and a fellow at Wolfson College, Cambridge.

He identified oxygen as a factor in polar gigantism and identified problems with protein synthesis as the cause of slow development and growth in polar marine species. He was awareded a Polar Medal in 2009, the PLYMSEF Silver medal in 2015 and an Erskine Fellowship at the ̽��ֱ�� of Canterbury, Christchurch in 2016-2017.

Professor Oscar Randal-Williams FRS

Randal-Williams is the Sadleirian Professor of Pure Mathematics in the Department of Pure Mathematics and Mathematical Statistics.

He has received the Whitehead Prize from the London Mathematical Society, a Philip Leverhulme Prize, the Oberwolfach Prize, the Dannie Heineman Prize of the Göttingen Academy of Sciences and Humanities, and was jointly awarded the Clay Research Award.

Randal-Williams is one of two managing editors of the Proceedings of the London Mathematical Society, and an editor of the Journal of Topology.

Professor Mihaela van der Schaar FRS

Van der Schaar is the John Humphrey Plummer Professor of Machine Learning, Artificial Intelligence and Medicine in the Departments of Applied Mathematics and Theoretical Physics, Engineering and Medicine.

She is the founder and director of the Cambridge Centre for AI in Medicine, and a Fellow at ̽��ֱ��Alan Turing Institute. Her work has received numerous awards, including the Oon Prize on Preventative Medicine, a National Science Foundation CAREER Award, and the IEEE Darlington Award.

Van der Schaar is credited as inventor on 35 US patents, and has made over 45 contributions to international standards for which she received three ISO Awards. In 2019, a Nesta report declared her the most-cited female AI researcher in the UK.

Ten outstanding Cambridge researchers have been elected as Fellows of the Royal Society, the UK’s national academy of sciences and the oldest science academy in continuous existence.

Royal Society

̽��ֱ��Royal Society in central London

Yes

‘Wraparound’ implants represent new approach to treating spinal cord injuries

sc604 — Wed, 08 May 2024 18:01:25 +0000

A team of engineers, neuroscientists and surgeons from the ̽��ֱ�� of Cambridge developed the devices and used them to record the nerve signals going back and forth between the brain and the spinal cord. Unlike current approaches, the Cambridge devices can record 360-degree information, giving a complete picture of spinal cord activity.

Tests in live animal and human cadaver models showed the devices could also stimulate limb movement and bypass complete spinal cord injuries where communication between the brain and spinal cord had been completely interrupted.

Most current approaches to treating spinal injuries involve both piercing the spinal cord with electrodes and placing implants in the brain, which are both high-risk surgeries. ̽��ֱ��Cambridge-developed devices could lead to treatments for spinal injuries without the need for brain surgery, which would be far safer for patients.

While such treatments are still at least several years away, the researchers say the devices could be useful in the near-term for monitoring spinal cord activity during surgery. Better understanding of the spinal cord, which is difficult to study, could lead to improved treatments for a range of conditions, including chronic pain, inflammation and hypertension. ̽��ֱ��results are reported in the journal Science Advances.

“ ̽��ֱ��spinal cord is like a highway, carrying information in the form of nerve impulses to and from the brain,” said Professor George Malliaras from the Department of Engineering, who co-led the research. “Damage to the spinal cord causes that traffic to be interrupted, resulting in profound disability, including irreversible loss of sensory and motor functions.”

̽��ֱ��ability to monitor signals going to and from the spinal cord could dramatically aid in the development of treatments for spinal injuries, and could also be useful in the nearer term for better monitoring of the spinal cord during surgery.

“Most technologies for monitoring or stimulating the spinal cord only interact with motor neurons along the back, or dorsal, part of the spinal cord,” said Dr Damiano Barone from the Department of Clinical Neurosciences, who co-led the research. “These approaches can only reach between 20 and 30 percent of the spine, so you’re getting an incomplete picture.”

By taking their inspiration from microelectronics, the researchers developed a way to gain information from the whole spine, by wrapping very thin, high-resolution implants around the spinal cord’s circumference. This is the first time that safe 360-degree recording of the spinal cord has been possible – earlier approaches for 360-degree monitoring use electrodes that pierce the spine, which can cause spinal injury.

̽��ֱ��Cambridge-developed biocompatible devices – just a few millionths of a metre thick – are made using advanced photolithography and thin film deposition techniques, and require minimal power to function.

̽��ֱ��devices intercept the signals travelling on the axons, or nerve fibres, of the spinal cord, allowing the signals to be recorded. ̽��ֱ��thinness of the devices means they can record the signals without causing any damage to the nerves, since they do not penetrate the spinal cord itself.

“It was a difficult process, because we haven’t made spinal implants in this way before, and it wasn’t clear that we could safely and successfully place them around the spine,” said Malliaras. “But because of recent advances in both engineering and neurosurgery, the planets have aligned and we’ve made major progress in this important area.”

̽��ֱ��devices were implanted using an adaptation to routine surgical procedure so they could be slid under the spinal cord without damaging it. In tests using rat models, the researchers successfully used the devices to stimulate limb movement. ̽��ֱ��devices showed very low latency – that is, their reaction time was close to human reflexive movement. Further tests in human cadaver models showed that the devices can be successfully placed in humans.

̽��ֱ��researchers say their approach could change how spinal injuries are treated in future. Current attempts to treat spinal injuries involve both brain and spinal implants, but the Cambridge researchers say the brain implants may not be necessary.

“If someone has a spinal injury, their brain is fine, but it’s the connection that’s been interrupted,” said Barone. “As a surgeon, you want to go where the problem is, so adding brain surgery on top of spinal surgery just increases the risk to the patient. We can collect all the information we need from the spinal cord in a far less invasive way, so this would be a much safer approach for treating spinal injuries.”

While a treatment for spinal injuries is still years away, in the nearer term, the devices could be useful for researchers and surgeons to learn more about this vital, but understudied, part of human anatomy in a non-invasive way. ̽��ֱ��Cambridge researchers are currently planning to use the devices to monitor nerve activity in the spinal cord during surgery.

“It’s been almost impossible to study the whole of the spinal cord directly in a human, because it’s so delicate and complex,” said Barone. “Monitoring during surgery will help us to understand the spinal cord better without damaging it, which in turn will help us develop better therapies for conditions like chronic pain, hypertension or inflammation. This approach shows enormous potential for helping patients.”

̽��ֱ��research was supported in part by the Royal College of Surgeons, the Academy of Medical Sciences, Health Education England, the National Institute for Health Research, MRC Confidence in Concept, and the Engineering and Physical Sciences Research Council (EPSRC), part of UK Research and Innovation (UKRI).

Reference:
Ben J Woodington, Jiang Lei et al. ‘Flexible Circumferential Bioelectronics to Enable 360-degree Recording and Stimulation of the Spinal Cord.’ Science Advances (2024). DOI: 10.1126/sciadv.adl1230

A tiny, flexible electronic device that wraps around the spinal cord could represent a new approach to the treatment of spinal injuries, which can cause profound disability and paralysis.

Because of recent advances in both engineering and neurosurgery, the planets have aligned and we’ve made major progress in this important area

George Malliaras

SEBASTIAN KAULITZKI/SCIENCE PHOTO LIBRARY

Illustration of spinal cord

Yes

Robotic nerve ‘cuffs’ could help treat a range of neurological conditions

sc604 — Fri, 26 Apr 2024 08:55:34 +0000

̽��ֱ��researchers, from the ̽��ֱ�� of Cambridge, combined flexible electronics and soft robotics techniques to develop the devices, which could be used for the diagnosis and treatment of a range of disorders, including epilepsy and chronic pain, or the control of prosthetic limbs.

Current tools for interfacing with the peripheral nerves – the 43 pairs of motor and sensory nerves that connect the brain and the spinal cord – are outdated, bulky and carry a high risk of nerve injury. However, the robotic nerve ‘cuffs’ developed by the Cambridge team are sensitive enough to grasp or wrap around delicate nerve fibres without causing any damage.

Tests of the nerve cuffs in rats showed that the devices only require tiny voltages to change shape in a controlled way, forming a self-closing loop around nerves without the need for surgical sutures or glues.

̽��ֱ��researchers say the combination of soft electrical actuators with neurotechnology could be an answer to minimally invasive monitoring and treatment for a range of neurological conditions. ̽��ֱ��results are reported in the journal Nature Materials.

Electric nerve implants can be used to either stimulate or block signals in target nerves. For example, they might help relieve pain by blocking pain signals, or they could be used to restore movement in paralysed limbs by sending electrical signals to the nerves. Nerve monitoring is also standard surgical procedure when operating in areas of the body containing a high concentration of nerve fibres, such as anywhere near the spinal cord.

These implants allow direct access to nerve fibres, but they come with certain risks. “Nerve implants come with a high risk of nerve injury,” said Professor George Malliaras from Cambridge’s Department of Engineering, who led the research. “Nerves are small and highly delicate, so anytime you put something large, like an electrode, in contact with them, it represents a danger to the nerves.”

“Nerve cuffs that wrap around nerves are the least invasive implants currently available, but despite this they are still too bulky, stiff and difficult to implant, requiring significant handling and potential trauma to the nerve,” said co-author Dr Damiano Barone from Cambridge’s Department of Clinical Neurosciences.

̽��ֱ��researchers designed a new type of nerve cuff made from conducting polymers, normally used in soft robotics. ̽��ֱ��ultra-thin cuffs are engineered in two separate layers. Applying tiny amounts of electricity – just a few hundred millivolts – causes the devices to swell or shrink.

̽��ֱ��cuffs are small enough that they could be rolled up into a needle and injected near the target nerve. When activated electrically, the cuffs will change their shape to wrap around the nerve, allowing nerve activity to be monitored or altered.

“To ensure the safe use of these devices inside the body, we have managed to reduce the voltage required for actuation to very low values,” said Dr Chaoqun Dong, the paper’s first author. “What's even more significant is that these cuffs can change shape in both directions and be reprogrammed. This means surgeons can adjust how tightly the device fits around a nerve until they get the best results for recording and stimulating the nerve.”

Tests in rats showed that the cuffs could be successfully placed without surgery, and formed a self-closing loop around the target nerve. ̽��ֱ��researchers are planning further testing of the devices in animal models, and are hoping to begin testing in humans within the next few years.

“Using this approach, we can reach nerves that are difficult to reach through open surgery, such as the nerves that control, pain, vision or hearing, but without the need to implant anything inside the brain,” said Barone. “ ̽��ֱ��ability to place these cuffs so they wrap around the nerves makes this a much easier procedure for surgeons, and it’s less risky for patients.”

“ ̽��ֱ��ability to make an implant that can change shape through electrical activation opens up a range of future possibilities for highly targeted treatments,” said Malliaras. “In future, we might be able to have implants that can move through the body, or even into the brain – it makes you dream how we could use technology to benefit patients in future.”

̽��ֱ��research was supported in part by the Swiss National Science Foundation, the Cambridge Trust, and the Engineering and Physical Sciences Research Council (EPSRC), part of UK Research and Innovation (UKRI).

Reference:
Chaoqun Dong et al. ‘Electrochemically actuated microelectrodes for minimally invasive peripheral nerve interfaces.’ Nature Materials (2024). DOI: 10.1038/s41563-024-01886-0

Researchers have developed tiny, flexible devices that can wrap around individual nerve fibres without damaging them.

̽��ֱ��ability to make an implant that can change shape through electrical activation opens up a range of future possibilities for highly targeted treatments

George Malliaras

XH4D via iStock / Getty Images Plus

Illustration of the human nervous system

Yes

‘Biohybrid’ device could restore function in paralysed limbs

sc604 — Wed, 22 Mar 2023 17:55:29 +0000

Researchers have developed a new type of neural implant that could restore limb function to amputees and others who have lost the use of their arms or legs.

Wireless limb control

jg533 — Mon, 17 May 2021 08:21:14 +0000

Researchers in Cambridge’s Bioelectronics Lab are developing implantable devices to bypass nerve damage and restore movement to paralysed limbs.