Protistic limbs are life-changing technology for those who have lost limbs through various causes. It became clear that there was a lot of focus on protistic legs and technologies to make them as comfortable and life-like as possible. The engineers have managed to design such a personalized model for making the legs, they can alter the types of legs for the different lifestyles and needs of the patients.

Arm and hand protistic seemed to be a lot more complicated due to the nature of hands having such complex sensory and dexterity properties. This got me thinking about how they can improve the technology, with sensors to help with gaining back complete function. While looking online about the research going on into hand and arm protistic, I came across a man who had recently had a double forearm and hand transplant. I was surprised and interested in this, the fact that they can transplant arms from donors and that this works giving patients back the use of hands that they have lost.

In the UK there is a specialist hand transplant team located at Leeds hospital. In a BBC documentary that has just come out called “Saving lives in Leeds”, in episode one they follow a story of a man who has a double hand transplant. In the documentary, the surgeon talks about the complexity of the surgery and the risk of rejection. Organ donors have always been something that I have known about, so many people would give consent for loved ones to donate a kidney or liver, or heart when they pass away but it had never occurred to me that someone would donate their hands.

The intricate nature of the function of the hands is important to maintain when doing a transplant otherwise it isn’t worth it for the patient. In Saving lives in Leeds the head surgeon talks about how they must connect the blood vessels and replace and sew together bones to allow the donor limb to become part of the recipient’s body. The hands regain sensory over a minimum period of 3 years. The nerve regeneration takes up to 6 weeks before patients start getting feeling in their new limb.

In the documentary, the mother of the patient touches on the impact that this will have on her son’s life. The ability to have full functioning hands again, the doors that will re-open for him, and the quality of life he will now be able to have. The significance of someone’s family allowing the donation of hands is also mentioned. Hands are a very personal feature of our bodies and to allow the donation of these to another person does not go unnoticed.

The UK’s first double hand transplant happened in 2016 at Leeds Hospital with a patient called Chris King. The YouTube video below is him talking about his experience of how a double hand transplant has changed his life.

Listening to these peoples’ stories and reading more about how these procedures are done, got me thinking about how I would feel if someone was to ask my permission for my loved one’s hands or if I would want someone to have my own. It is such a life-changing thing that some can do for another, it is like consenting to a kidney, liver, or heart but in some way, it feels a lot more personal. An interesting and thought-provoking transplant that will hopefully inspire more of these life-changing surgeries. It made me think of all the potential for other body parts that might be able to transplant in the future, such as legs, ones we’ve never thought of before.

Type 1 diabetes is a prevalent chronic illness with 1.4 million new cases in the USA per year. (ADA). It is a product of an insufficiency of insulin, caused by the autoimmune destruction of the insulin-secreting pancreatic β-cells. There is no current cure for Type 1 diabetes, however, there are a number of treatments to help cope with it.

Islets of Langerhans are cells from human donors in the pancreas that secrete insulin and glucose and can continually control blood sugar levels when implanted in the liver. Islet transplantation for diabetes has shown to be less invasive and result in fewer complications in comparison to traditional transplantations.

One potential cure for Type 1 diabetes is human embryonic stem cells (hES), which are cells that have the ability to efficiently and rapidly differentiate and are functionally similar to adult human islets. This suggests that hES cells may be a  renewable supply of human β-cells that can aid to the development of cell therapy for diabetes (Kroon et al. 2008). A limitation in this domain is that there is a scarcity of donor tissue (Champeris Tsaniras and Jones, 2010), which can restrict the use of such therapies. This reflects the need for more donors to help treat those with this chronic illness.

In more recent literature, protocols have been created/improved to drive human pluripotent stem cell–derived pancreatic β cell growth (SC-β cells) through the stages of its development (definitive endoderm, primitive gut tube, pancreatic progenitors, endocrine, and β cells). Hogrebe et al. (2021) postulated the importance of the influence of microenvironment and cytoskeletal signalling on endocrine induction (both of which can influence the generation of these cells) that generate highly functional SC-β cells.

This not only simplifies differentiation methodology, but also improves outcomes for multiple cell lines. This is advantageous as cell lines have a longer life span, proliferate more quickly and are easily manipulated. These are important for complex tissues and allow for better examinations of alterations in structure, genetic makeup, and biology of the cell. Using this new information, Hogrebe et al. (2021) created the six-stage SC-β cell differentiation protocol for generating highly functional SC-β cells. This protocol recreates stages of embryonic development to achieve high SC-β cells maturity and differentiation efficiency. A limitation to note, however, is that this multi-stage process takes 5 weeks to complete, which can create possible problems that affect the successful generation of stage SC-β cells. Despite this, this paper has lay the groundwork for effectively generating stage SC-β cells from cell lines that didn’t work for other protocols. Overall, this has posed a positive impact on this research field and has pathed the way for improved protocols for cell generation and potential cures for Type 1 diabetes.

Final considerations:

Earlier in the module, my interest was captured when the lecturer mentioned stem cells and diabetes in week 2. With family attachments to diabetes, I felt an appeal to research further into this field. I never fully understood the burden diabetes can have on an individual, and I feel as if others don’t quite understand either. Therefore, reading more into this literature has only enriched my knowledge further and given me the opportunity to better understand the struggle.

One aspect that sparked my interest when doing my research is that there are developments for potential cures, which I didn’t realise there could be one. With advancing technology anything is clearly possible!

My take home message from doing this research is to encourage more people to donate donor tissue to help those with diabetes and that bioengineering technology and developments are only growing, which gives hope to those currently suffering with this chronic illness.

Reference list:

Champeris Tsaniras, S., & Jones, P. M. (2010). Generating pancreatic β-cells from embryonic stem cells by manipulating signaling pathways, Journal of Endocrinology, 206(1), 13-26. Retrieved Mar 6, 2023, from https://joe.bioscientifica.com/view/journals/joe/206/1/13.xml

Hogrebe, N.J., Maxwell, K.G., Augsornworawat, P. et al. Generation of insulin-producing pancreatic β cells from multiple human stem cell lines. Nat Protoc 16, 4109–4143 (2021). https://doi.org/10.1038/s41596-021-00560-y

https://diabetes.org/about-us/statistics/about-diabetes#sthash.F8fRkPqd.dpuf#:~:text=Prevalence%3A%20In%202015%2C%2030.3%20million%20Americans%2C%20or%209.4%25,American%20children%20and%20adults%20have%20type%201%20diabetes. accessed 6th March, 2023.

Kroon, E. et al. Pancreatic endoderm derived from human embryonic stem cells generates glucose-responsive insulin-secreting cells in vivo. Nat. Biotechnol. 26, 443–452 (2008).

Xin-Xin Yu, Cheng-Ran Xu; Understanding generation and regeneration of pancreatic β cells from a single-cell perspective. Development 1 April 2020; 147 (7): dev179051. doi: https://doi.org/10.1242/dev.179051

“The wrongs which we seek to condemn and punish have been so calculated, so malignant, and so devastating, that civilization cannot tolerate their being ignored, because it cannot survive their being repeated.”

Nuremberg Trials

During the last lecture of Engineering Replacement Body Parts, the main topic was bioethics. Although I was never introduced to this topic before, in high school I had already heard about the “Nuremberg Trials”, and their importance in condemning people responsible for such atrocities during World War II. This is the reason why I decided to write this post about this historical event that completely changed our views about scientific progress and research. 

Crimes against humanity

Crimes against humanity refer to specific crimes against a large-scale attack targeting civilians, regardless of their nationality. These can include persecution, murder, sexual violence, enslavement, torture, enforced disappearance, etc. Unlike genocide, crimes are not necessarily committed against a specific national, ethnical, racial or religious group. These crimes can also be committed in peacetime by legal State policies as well as non-State armed groups or paramilitary forces. 

Since the 1945 Nuremberg Charter, the list of crimes against humanity expanded via diverse international treaties, such as the Statute of the International Criminal Tribunal for the former Yugoslavia (1993), the Statute of the International Tribunal for Rwanda (1994) and the Rome Statute of the International Criminal Court (1998). The Rome Statute is the most recent and expansive list of specific acts that may be considered against humanity.

Video introducing the Nuremberg Trials

18th October 1945

The International Military Tribunal (IMT) was composed of both Allied countries and representatives of Nazi-occupied countries and aimed at punishing the leaders and army of a regime. This was the first time in history. 22 Nazi Germany’s military, economic and political leaders were brought to trial in Nuremberg for crimes against peace, war crimes, and crimes against humanity. The tribunal delivered its judgement against the Nazi leaders on 30th September and 1st October 1946: 12 were sentenced to death, 3 to life imprisonment, 4 to imprisonment ranging from 10 to 20 years, and 3 were acquitted.

Subsequent Nuremberg Proceedings

Subsequent Nuremberg Proceedings were trials to determine the guilt for crimes against peace, war crimes, and crimes against humanity of defendants who represented many parts of German society, from jurists and politicians to businessmen, physicians, army officers and collaborators.

These trials included 23 leading German physicians and administrators who were accused of human experimentation utilising thousands of concentration camp prisoners without their consent or were involved in the Euthanasia Program. This programme aimed at systematically killing those they considered “unworthy of life” due to severe psychiatric, neurological, or physical disabilities. On 20th August 1947, after almost 140 days of proceedings, including the testimony of 85 witnesses and around 1,500 documents, the judges found 16 physicians guilty, and 7 were sentenced to death. 

I already knew about the Euthanasia Programme due to a school journey in Germany and Austria aimed at “experiencing” the journey of survivors of WWII. In this journey, I also visited an actual centre that was used during the Euthanasia Programme to exterminate all German and Austrian children with severe neurological disorders and autism: the “Hartheim Castle”. I still remember the net contrast between the appealing aspect of that castle and the very dark atmosphere inside.

In the ground floor of this castle, there is a very impressive memorial that was made after Americans occupied that place at the end of the war. This memorial is a continuous screen positioned along the walls and in the centre of a room. This screen quotes names of all people killed there, at least the ones we have memories of. These names were written very close to each other with a very small size, and still occupied an entire room. This view is still so vivid in memory and continues to impress me.  

While researching more about “crimes against humanity”, I realised that the Nuremberg code is not the only one that codifies specifically for crimes against humanity but there are more recent codes I had never heard of! Moreover, I had no idea about the existence of so many different types of crimes that can be considered against humanity. I thought that the only one was basically the extermination of part of society with specific traits or ethnicity (e.g., extermination of black people or Jewish). This proves that it is never wrong to reiterate such important ethical concepts. I felt also shocked by the very small number of people actually sentenced for those crimes, compared to the real number of people that should be held responsible. 

In conclusion, it is still incredible to me how the Nuremberg Trials, held more than 70 years ago, can still affect so much our scientific progress and research. I believe that this knowledge is essential for me to become a good biomedical scientist. I will always keep in mind this determining historical event while designing my own experiments as well as reviewing other scientists’ papers to avoid committing the errors of the past. That way, I can positively contribute to the scientific community in an ethical and respectful way. 

References

1. United States Holocaust Memorial Museum, “The Nuremberg Trials”: https://www.ushmm.org/collections/bibliography/the-nuremberg-trials

2. TRIAL International, “Crimes against humanity”:

Recently I read a news article about a man called Adam Castillejo who was cured from HIV by a stem cell transplant he received for a cancer that he had and is still virus free 30 months after stopping HIV medication! This compelled me to research further into this, as I personally would have never made this link. 

Stem cells are known for their ability to change into specialised cells that later develop to become blood cells, bones, and all human organs. Stem cells are cells produced by bone marrow and utilised to treat many medical diseases and conditions with their potential to repair, replace, restore and regenerate cells. They are most commonly used to replace damaged cells in cancer patients to fight such diseases.

I’m sure almost everyone has heard of HIV, but just to recap, HIV stands for a Human Immunodeficiency Virus that weakens people’s defence against infections and is most prevalent in male homosexual contact. At the end of 2018, it was found that an estimate of 1.2 million Americanshad HIV, with 76% of those being men. To shock you even more, HIV is top 15 for the leading causes of death globally in 2016. Now with that background knowledge of both, have you ever thought that stem cells can cure HIV? 

I particularly have never put two and two together, however, with recent news, it is stated that there are currently five people cured of HIV – most of them cured as a result of stem cell transplants. Current research has illustrated that stem cell transplants stop the HIV virus being able to replicate by replacing the patient’s damaged immune cells with specialised donor immune cells that resist the HIV infection. However, this treatment is aggressive and primarily used for cancer patients, and health professionals suggest not using this therapy for those on successful anti-retroviral treatment for HIV. 

The primary goal for treating HIV is the clearance of the virus from the body through augmentation of immune responses. For those who don’t know, CCR5 is a receptor that HIV uses to enter cells in the body. Those who are resistant to HIV appear to have two mutated copies of the CCR5 receptor, which means that the virus cannot penetrate the cells. Researchers have suggested the use of gene therapy (gene modification) to target the CCR5 receptor in HIV patients. Researchers are currently developing strategies to cure HIV, with the idea that stem cells are resistant to the virus, the cells produce lower amounts of infectious virus, or the cells specifically target the immune response against the virus.

Previous clinical trials have shown new advances in these stem cell-based approaches to curing HIV, with onein particular demonstrating that large-scale gene therapy trials can be done in a conventional and reproducible way. This efficient way to produce these specialised stem cells is ground-breaking and only further paves the way for a promising cure!

For me, I would have never thought stem cells to be the cure for HIV, or even the fact that this disease is curable with, although very few, survivors. I feel that this topic is very underdiscussed, especially since reading into this field, I have only further enriched my knowledge. New and current emerging information on HIV and gene therapy has laid the groundwork for the potential development of a cure for HIV, however, long-term follow-up is needed.

Manuel is only four-year-old when he is diagnosed with acute myeloid leukemia. Manuel is an Italian boy who survived cancer thanks to a stem cell transfusion from a Spanish donor and ten years after the transplantation, his family decided to visit the center where the stem cells that gave Manuel a second life originated. A moving moment for Mother Simona, who received a token of love in the form of a contribution that she, too, decided to make in 2007, with the birth of her second child.

For about 35 years now, in a completely non-invasive and safe way, it has been possible to donate mother’s umbilical cord from which special cells are taken, stored, and used to treat diseases of people from anywhere in the world. These “special cells” are called Hematopoietic stem cells and can change into any sort of blood cell and can be utilized for transplants that help cure diseases such as blood problems, immunological deficiencies, metabolic diseases, and some forms of malignancies. At the end of the birth, after the cut, about 1 liter of blood is taken through a puncture to the umbilical cord. The sample obtained is sent to the collection bank, assessed if suitable and then frozen pending use. Banking cord blood has been compared to a “biological insurance policy” and there are two types of banks to go to: private and public, but which is the best solution to ensure safety for your child?

The choice should always lean towards donation and the reason is primarily scientific as there is no scientific evidence that private conservation is useful in the treatment of various diseases treatable through transplantation (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1601996/). When a mother decides to donate to a private bank, the treatment is carried out for a fee and the cells are kept for a period of about 20 years, after which, by paying a further amount, the storage time can be extended. The cells are accessible only to the patient from whom they were taken or from a family member, with the intention of treating a possible future disease. The point is that in the case of oncological or genetic diseases, one’s cord blood cells could already be carriers of those genetic “defects” that have led to the disease. In these cases, the persistence of diseased cells in the product which is reinfused involves the risk of the disease reappearing. The only justified case for turning to private banks could be the presence of a hereditary risk, which can be treated with autologous stem cells. On the other side, donating to a public institution is free and guarantees a second life to a patient with a match who really needs it. If every mother decided to turn to public bodies, the material kept in the banks would increase and there would be much more chances that every applicant could find a compatible donor.

Donate is life, love and a responsible gesture towards the world and everyone should be aware of it.

The video below shows the process of how to harvest stem cells from umbilical cord blood and keep them in the bank

In 2002, a woman called Karen Keegan underwent a genetic test to find a suitable kidney donor within her family. Results were astonishing: Karen was not the mother of her sons.

Karen was later discovered to be a human chimaera with 2 distinct sets of DNA, with that in her blood cells different compared that of the other tissues.

The video below explains in more detail Karen’s story and introduces the phenomenon of chimerism

A chimaera is a single organism or a tissue which contains cells with at least two different sets of DNA. Since all animals develop from a single fertilised egg, every single cell of the body is supposed to have exactly the same DNA. 

Researchers have developed chimaeras, whose bodies are a mix of cells from diverse species, in order to study human disease and find effective treatments. In fact, the most common organisms used to make chimaeras are mice, rats, pigs and monkeys, which all share a significant number of homologous genes with us. 

However, chimaeras are not always man-made, as there are at least three examples of already existing human chimaeras: 

1. When a foetus absorbs its twin 
2. When a patient undergoes a bone marrow transplant – e.g., to treat leukaemia  
3. When a small fraction of cells are from someone else, so-called “Microchimerism”

1) When a foetus absorbs its twin

This occurs during a fraternal pregnancy when one embryo dies very early, and the remaining one “absorbs” some cells from its twin in the womb. Therefore, the remaining foetus has two sets of cells: its original and the one acquired from its twin. These individuals very often do not even realise they are a chimaera. 

People with this form of chimerism very often do not even realise they are a chimaera because they can appear entirely normal. Most of the time, this is discovered by accident, and makes this particular phenomenon very difficult to quantify. More rarely, individuals show visible signs, such as diverse eye colours, patches of skin of different shades, or even a mixture of female and male cells which can cause abnormalities in their reproductive organs.

2) Bone marrow transplant

Human bone marrow contains haematopoietic stem cells, which give rise to all types of blood cells in our body (e.g., white and red blood cells). When a person undergoes a bone marrow transplant, their own bone is destroyed and replaced with a new one from another person, therefore acquiring “foreign” blood cells for the rest of their life. In fact, these haematopoietic stem cells are genetically identical to those of the donor but are different from the rest of the patient receiving the transplant!

3) Microchimerism

This phenomenon seems to occur in almost all pregnant women (at least temporarily), as a very tiny number of cells from the foetus migrate into her blood and travel to diverse organs. 

In 2015, researchers took samples on 26 women from their kidneys, livers, spleens, lungs, hearts, and brains. Results showed that all women, who had all been carrying sons, had foetal cells in all of these tissues, as these contained a Y chromosome (found only in males). 

Another study in 2012 found foetal cells in 63% of the brains of 59 women ages 32 to 101, including the oldest who was 94 years ago. This could suggest that most mothers have cells from their babies growing in various parts of their body after pregnancy, and these cells can survive in a lifetime.

Final considerations

Before hearing Karen’s story during a university lecture held a week ago, I had no idea about the existence of human chimaeras. Her story quite shocked me as I couldn’t believe that she was not really the mother of her son, and therefore I decided to dig down the topic of chimaerism. 

In the past, I had heard the term “chimaera” in some fantasy movies, as I am very passionate about this genre. However, I had never thought that this was possibly achievable in the real world, not even artificial chimaeras made in the laboratory. 

Through this research, I learned that Karen’s story is not the only one of human chimaeras but there are many other instances. Thinking about what to write in the final considerations for this post, I had an epiphany, which inspired the title of this post: at least temporarily, we all are chimaeras! 

We exchange living cells between us more often than we think, ranging from kissing or touching to sexual intercourse or a more invasive transplant! Yes, you read it right, but you probably didn’t know that even a very passionate kiss is able to transfer living cells from you to your partner and vice versa, making both of you temporary chimaeras! So I’ll be very careful the next time I choose who I’ll kiss … 

Now, I recognise that chimaerism can come in various forms and quantities. More often, we contain only a few living cells from another person, and more rarely a single person can be a fairly equal mix of cells with distinct sets of DNA. 

Building the first layer of knowledge on a completely new topic has completely challenged my previous understanding. I learned that hearing something for the first time can be quite shocking at first but I should make use of this experience positively to expand my views and opinions, rather than as a way to discourage myself. In the future, I will keep this positive attitude to get to know new topics, which could completely challenge the knowledge I have just acquired!

References:

1. Scientific American article written by Rachael Rettner, LiveScience on August 8, 2016

https://www.scientificamerican.com/article/3-human-chimeras-that-already-exist/

2. MCSM RAMPAGE article written by Fariha Fawziah on January 31, 2017

“It just looked like any transplant I’ve ever done from a living donor. A lot of kidneys from deceased people don’t work right away, and take days or weeks to start. This worked immediately.”

Dr. Montgomery, director of the N.Y.U. Langone Transplant Institute in Manhattan. 

Currently, more than 100,000 Americans are on the waiting list for a transplant, with more than 90,000 only needing a kidney. 12 people on this waiting list die each day. 

Researchers have been studying to grow human organs in pigs to create perfectly suitable tools for transplantation into humans. So far, pig hearts and kidneys have been successfully transplanted into baboons and monkeys but never in humans.

In 2021, an incredible surgery was performed in N.Y.U. Langone Health. The aim was to “simulate” an actual transplant procedure to prove that a genetically engineered pig’s kidney is able to avoid rejection by a human’s body. This specific kidney was obtained by knocking out a gene that encodes a sugar able to elicit an aggressive human rejection response. This was done because rejection occurs very often in the so-called “xenotransplants”: transplants from animals like pigs and primates to human beings.

A pig’s kidney was attached to blood vessels in a brain-dead patient’s upper leg, outside the abdomen. Then, the surgeons covered it with a protective shield in order to allow constant observation. Kidney’s function was measured by taking samples over the following 54 hours study period. It was the first operation of this kind ever in human history.

Results are astonishing: the kidney was working normally “almost immediately” by starting to make urine and the waste product creatinine. Importantly, there were no signs of rejection.

Video showing the successful transplant on local news 

Reactions among the transplantation experts

According to the experts, this is a very good sign as an organ functioning outside the body is a strong indication that it will work inside the body. While some surgeons speculated that this practice will become ordinary in the next few years, others argue that still much more work is needed. Anyway, all transplantation experts acknowledged the importance of this mind blowing surgery. Among them, reactions ranged from extremely optimistic to very careful and warning.

“This is really cutting-edge translational surgery and transplantation that is on the brink of being able to do it in living human beings”

Dr. Amy Friedman, former transplant surgeon and chief medical officer of LiveOnNY

However, this looks too good to be true …

Testing experimental kidneys in humans has presented several daunting concerns:

1. We still do not have studies and answers about long-term consequences of such an operation 
2. Animal welfare and exploitation, as thousands of pigs will be raised with the unique aim of getting their organs harvested for a “better” human receiver 
3. Pigs can get affected by some viruses which do not affect humans. Can then humans develop these viruses or are they protected? 
4. Last but not least, we need to make sure that the person fully consents to the practice, knowing all the benefits and risks. In this specific experiment, the family gave the consent and the person themselves, as they were brain-dead. How could this work in practice in the future?

This opens the door for using genetically engineered pigs as a sustainable renewable source of organs for severely ill patients, as the current clinical need is still unmet. However, this procedure will not be available to any patient any time soon due to many relevant medical and regulatory hurdles that still need to be overcome.

In the future, not only kidneys, but also other organs could be transplanted, including hearts, lungs, livers … potentially every organ in our body also present in the pig! All these organs could save the life of thousands of people who die everyday waiting for a suitable human donor, as there is scarcity of human organs. For instance, most dialysis patients do not qualify for transplants, which are reserved for those more likely to survive after the procedure.

Final considerations

At the end of a university lecture, the professor briefly quoted a recent research which tried to create a complete human organ into a pig by combining human iPSCs (Induced Pluripotent Stem Cells) with a pig embryo. The experiment actually failed, as there were pig cells stained in the human-like organ. However, this sparked my curiosity to find out more about xenotransplantation between pigs and humans to see if there have been more recent successful experiments. 

One shocking aspect I discovered while writing this post is that an organ is able to properly function without even being “internally” transplanted but simply being linked with blood vessels to the natural functioning organ. I had never thought this was possible, nor had I never read about  a similar experience. 

My expectation was to discover that someone was at least being transplanted with a very small and simple organ from a pig. Although the surgery is not an actual “transplantation”, it clearly represents a sea change for the organ transplant’s knowledge. Through this research, I have challenged my previous viewpoint about scientific research because I learned that progress sometimes requires “intermediate” steps to achieve the final goal. In the future, I will positively approach all research and experiments, although these don’t necessarily meet my initial expectations.  

What about you, would you ever receive a organ from a pig, or a primate?

Reference

“The New York Times”, article written by Roni Caryn Rabin on October 19, 2021

An ongoing experiment

The “Esper Hand”

“We sought to create a light and durable hand with human-like dexterity that learns over time and can help people with limb differences live their best lives confidently.”

Dima Gazda, co-founder of Esper Bionics

In 2021, New York-based engineering startup Esper Bionics developed a new incredible bionic hand that seems to work three times faster than many of all its other competitors currently available on the market. 

In the video below, a user called Nika performs a series of tasks with her bionic Esper Hand, ranging from grabbing small objects to wielding a beefy knife.

Esper Hand has 5 flexible and modular fingers and weighs only 380 grams, making it lighter than a human hand and many limb prosthetics on the market. It is composed of a combination of aluminium, fluoroplastics, polyoxymethylene plastic, titan, nylon, bronze, steel and 3 different types of silicone. On top of interfacing seamlessly with its wearer, Esper hand has also 4 different sizes and 5 colours.

This hand can rotate and grip in several ways and the modular fingers can form multiple common grasps including cupping, flexing, making a fist and pinching fingers together. This allows the wearer to perform a wide range of movements for day-to-day tasks, including using kitchen utensils, opening bottles, tapping a phone screen or even driving a car!

This prosthetic can also be easily disconnected via a further mechanism so that the wearer can switch it on and off according to their needs, such as while changing clothes. 

How does “Esper Hand” work?

This bionic hand was developed by conducting durability tests on 3D-printed versions of the hand to adjust its size and shape. Esper Hand makes use of an electromyography-based brain-computer interface (BCI), a computer-based technology system that collects brain information or activity, in order to trigger muscle contraction. This type of technology is not completely new, as it has already been used by paralysis patients to control machines by simply their thoughts.

When the wearer wants to control their hand, the brain sends electrical signals to specific muscles in order to activate them. Esper hand is able to simulate this brain control through  over 30 non-invasive myoelectric sensors that connect the stump socket to the wearer’s skin. These are the myoelectric inputs for movement which generate electrical signals exactly as those naturally generated by one’s muscles to trigger action in the hand. 

What makes “Esper Hand” so special?

“Thanks to all the collected data, the platform updates the control algorithms of the hand so that next time the preferred grip will have a higher priority to be chosen in the same situation”

Dima Gazda, co-founder of Esper Bionics

This prosthetic works with intuitive self-learning technology that can predict intended movement faster than similar prosthetics, therefore improving its performance over time on the same user. 

This occurs via a specific phone app that sends all the myoelectric inputs to Dubbed Esper Platform, a cloud based-platform managed directly by Esper Bionics, which collects and stores data about the user’s movements. This allows its creators to study and improve the algorithms that translate those inputs into digit movements so that the wearer’s next action will be quicker predicted and performed, basically like a “learning” mechanism. 

Personal reflection

After attending a university workshop where the professor showed us examples of prosthetics, I felt quite fascinated by the unrealistic appearance of a prosthetic hand that was used by a double amputee to cut a carrot. A example of this hand is shown in the picture on the right. It is very common in US rural areas because it is extremely functional. However, it is not very aesthetic in appearance since it looks more like a very old hook than a beautiful human hand.

The same day of the workshop, the video about Nika using Esper Hand appeared on top of my YouTube page. That girl seemed so happy and comfortable using Esper hand (which really resembles a human hand!) that I chose to dig down the topic.

During the research, I felt quite shocked by knowing the possibility of a way to improve a prosthetic’s performance via more efficient algorithms. I had never thought about it before, and I realised that this is a very clever and non-invasive method not only to improve the prosthetic, but also to learn more about research of human movements in order to increase scientific output!   

This realisation inspired the title of this post: “Can prosthetics learn over time?”. Incredibly, the simple answer was: “Yes!”. However, this was not enough for me, and I started to wonder about humans made by prosthetics that I had seen in Marvel movies, such as incredible superheroes fighting against the most powerful devils in the world to eventually restore peace.

What if this bionic hand could actually perform even BETTER than the natural hand? 

I thought that if prosthetics not only could really improve their performance over time to equate that of the natural hand, but also overcome the performance of the natural hand thanks to outstandingly efficient algorithms… This might open the doors for a new technological era in the AI and robotics field. 

However, computers and AIs are much quicker at performing logical calculations and computations but not interpreting signals from the outside world to generate an adequate response, as our brain does continuously. Some studies have actually proved that the brain has higher computational power efficiency than electronic computers by orders of magnitude. This is why computers and AI architectures are all modelled in an attempt to better emulate the human brain! 

Getting to know the Esper hand story has completely challenged my previous understanding of the potential of prosthetics. I learned that prosthetics are not static entities but can “learn” over time, although in a completely different way than a human brain. This triggered me so many unsolvable questions and made me wonder in my fantasy. In the future, I will keep this curious attitude by letting my thoughts wander for a while to come up with interesting observations that can lead me to further research and understanding, which is not necessarily related to the initial topic. 

Anyway, I will also need to be careful when I should stop my fantasy to be more realistic in order to avoid an unproductive combination between fantasy and reality. For example, the presence of “superhumans” looks still very far from reality, as many of our brain’s processes are still unknown. This strongly affects our knowledge of even the most powerful and quickest prosthetic AI. But in the future, who knows, maybe the “superman” from the comics will exist for real!

References

Dezeen article, written by Alice Finney, on February 24, 2022

https://www.dezeen.com/2022/02/24/esper-bionics-human-prosthetic-arm-mind-control/#:~:text=Esper%20Hand%20is%20a%20prosthetic%20arm%20that%20can%20be%20controlled,an%20action%20in%20the%20hand.

If you are interested to know about the “Esper Bionics” company, you can find more information in the following link: https://esperbionics.com/.