3D Printing Organs: How Far Are We?
Imagine how fortunate many people would be if 3D printing technology could print functional organs for human beings. It would normalize life for people afflicted with loss or dysfunction of organs.
What is Organ 3D Printing, and What are the Steps Involved?
With the use of specialized printers, bioprinting or simply organ printing, is a cutting-edge technique that makes it possible to create three-dimensional biological structures out of layers of living cells, biomaterials, and other components. In the areas of medicine, tissue engineering, and regenerative medicine, it has enormous potential. Bioprinting enables the generation of intricate, functioning tissue and organ-like structures by accurately depositing cells and bio-inks in a controlled manner. With this technology, it may be possible to construct in vitro drug testing models, develop patient-specific organs for transplantation, and better understand how diseases arise and change over time. Bioprinting, albeit still in its infancy, has the potential to revolutionize healthcare by opening up new doors for personalized therapy and organ replacement.
It's a fascinating area of study that might transform medicine and offer a fresh approach to treating various disorders. The first 3D-printed human bladder was produced by Wake Forest Institute for Regenerative Medicine (WFIRM) researchers. A patient's cells were used to create the bladder, successfully implanted into the patient. It had never been accomplished to transplant a 3D-printed organ into a person before successfully.
Organ 3D printing comprises numerous processes, including:
- Making a 3D organ model: Computer-aided design (CAD) software is used to make a 3D organ model. This model serves as a 3D printing procedure manual.
- Choosing the right materials: The right materials are chosen to 3D print the organ. These substances must be biocompatible, meaning they can interact with the body without causing harm.
- Organ 3D printing: Using the chosen materials, the 3D printer builds the organ layer by layer.
- Engineering the organ: After printing the organ, it must be designed to perform as intended. This might entail adding new nerves, blood arteries, and other structures.
- Testing the organ: The organ is examined to determine its viability and suitability for transplantation into a recipient.
Best 3D Printing Software
Creating 3D models of organs is not as easy as creating 3D models of other objects. Organs require intricate detailing compared to other models because every inch of an organ has a function. To create 3D models like that, you need software with tools good for organic modeling, like 3D sculpting and other modification tools, and it should also be easy to use. There are many available, but a good example is SelfCAD. SelfCAD is a 3D modeling software that you can use to create both simple and complex designs with ease even if you don’t have previous experience in 3D designing.
It comes with powerful sculpting brushes that you can use to create any organic design with ease and you can modify them based on your needs. There are also basic 3D shapes available which you can use as the basis of creating your models. Also, if you have 3D scans of your organs and you would like to fix them, you can use the tools of SelfCAD, like the magic fix to fix the meshes and ensure that they are ready for 3D printing. After you are done creating models and you want to 3D print, you can use the in-built online slicer of the software to do so without having to switch to another separate program. The slicer of SelfCAD is also compatible with most of the common FDM 3D printers.
What are the Best Examples of 3D-Printed Organs?
1. Beating Heart
A Boston University research team has created a tiny replicate of a human heart using 3D printing technology. Human stem cell-derived cardiac cells and microscale 3D-printed acrylic pieces were combined to make this model. It is a "precision-enabled miniaturized unidirectional cardiac microfluidic pump," known as miniPUMP when expanded. Because of its living tissue, the miniPUMP can beat independently, exactly like a human heart.
Researchers will use this heart chamber model to examine how the heart functions in the human body. For instance, the device might be used to learn more about how the heart develops in an embryo, how diseases damage heart tissue, or how well new medications work to treat certain conditions. A genuine revolution might do away with the requirement for future human testing.
2. Kidney Tissue
Kidney failure affects countless people worldwide, yet few therapy choices are available. Trestle Biotherapeutics, a company based in the United States, has been striving to create 3D-printed tissue to treat patients with end-stage renal illness. In particular, this is fully functional kidney tissue intended to augment and replace earlier lost renal function.
Trestle Biotherapeutics asserts that the combination of stem cell biology and 3D bioprinting underlies the efficacy of this novel therapy. The Trestle team wants to use this bioprinted kidney tissue as a functional substitute in addition to releasing patients from their dialysis regimen and extending their time before transplantation.
2. 3D Printed Ovary
Women's health is frequently regarded as an area of medicine that needs more study because many problems are still poorly understood. However, 3D bioprinting of reproductive system components could aid researchers in their quest to comprehend cell activity better and, in turn, various disorders. Gelatin methacryloyl (GelMA), a popular hydrogel used in bioengineering, and mouse cells were utilized by a team of researchers at Tongi Hospital in China in 2022 to create a 3D-printed artificial ovary. They discovered that this hydrogel was an appropriate material for 3D bioprinting. The findings revealed that it wasn't appropriate for primary or ovarian cells taken straight from tissue. However, it was appropriate for the in vitro development of ovarian follicles, a collection of cells that includes an immature egg cell and other cells. The researchers claim their findings could be therapeutically used to treat female endocrine and reproductive disorders.
3. Mini Liver
Scientists at the University of Sao Paulo in Brazil have successfully created miniature replicas of a human liver made from blood cells. From the time the patient's blood was drawn until the tissue was created, the procedure only required 90 days. These liver organoids were created using 3D bioprinting techniques and incorporated the functions of the 3D-printed organ. These consist of the synthesis of essential proteins, the storage of vitamins, and bile secretion. The group employed the Inkredible bioprinter, marketed by one of the most well-known manufacturers in the field, CELLINK, to produce the liver tissue.
4. Bioprinted Pancreas
Since it produces insulin, the pancreas has a significant function in the body. As a result, when it fails, it can have major repercussions, including the development of diabetes. The search for more long-lasting and efficient diabetes cures is growing more crucial, given that the disease affects more than 463 million people globally, and 3D printing, in particular, may have a role in this.
For instance, the Polish company Polbioonica, a spin-off from the Foundation for Research and Development of Science, was the first to use bioprinting to create a bionic pancreas with a full vascular system back in March 2019. The company is committed to creating these fully functional organs from proprietary bio-inks, pancreatic islets, and the patient's stem cells. They anticipate that the customized solution will not only address the world's growing organ shortage but it may also stop diabetic patients from developing complications and lower healthcare costs.
5. 3D Printed Ear
A 3D-printed ear was transplanted onto a young American woman with microtia. It is a congenital abnormality that prevents the outer ear from developing normally. The implant was created by the business 3DBio Therapeutics using the patient's cartilage cells and collagen hydrogel. The ear can be harvested with as little as half a gram of cartilage. A proprietary nutrition mixture is used to develop cartilage-forming cells, which grow as a result. The bio-ink is then added to these. For patients, an ear may be produced in about ten minutes. After printing, the ear is sent to the surgeon, who carries out the transplantation after receiving it in a protective casing.
The cost of this procedure is lower than the standard method of care, which involves creating a prosthesis from rib cartilage. The Wake Forest Institute for Regenerative Medicine's Director, Professor Anthony Atala, highlights the significance of this endeavor as a tremendous milestone for regenerative medicine. Scaling, greater design precision, and reduced cost are just a few benefits that 3D printing intends to provide over manually created artificial tissue.
6. 3D Printed Nose
There are several reasons why a patient can need prostheses, especially if they have conditions that might necessitate surgery. It might be challenging for the sufferer to drastically alter their appearance, even if addressing the ailment is paramount. Fortunately, bioprinting might also be able to address this problem. In a case from the Toulouse University Cancer Institute and CERHUM, a patient who underwent treatment for nasal cavity cancer lost a significant portion of her nose as well as the front part of her palate was able to essentially grow her nose, enabling a full reconstruction to be performed by Drs. Agnes Dupret-Bories and Benjamin Vairel. The procedure involved several phases, beginning with the implantation of a 3D-printed biomaterial beneath the patient's forearm's skin to facilitate vascularization or the process of forming blood veins in a tissue. The medical device had effectively colonized after two months, at which point it was transplanted to the nasal region and completely revascularized, providing the patient a fully functional nose manufactured from her own cells.
7. 3D Printed Skin
A French startup called Poietis specializes in 3D bioprinting technologies. It creates and sells a line of Next Generation Bioprinting 3D bioprinters. This organization is particularly well known for its skin-related studies. Poietis introduces the Poieskin, a full-thickness 3D bioprinted model of human skin. The dermal compartment, one of the three layers of skin that lies between the epidermis and the hypodermis, is made up of fibroblasts, cells from the dermis, encased in type 1 collagen, and it is covered by an epidermis that is structured in layers that are stacked to create a 3D pattern.
Anyone with serious burns, cancer, or other accidents may use this 3D bioprinted skin. Poietis claims that its 3D bioprinter's high precision and resolution enable the creation of controlled 3D cellular structures and replicable skin tissue models. The French manufacturer's 3D bioprinter has enabled them to start their first clinical trial. Additionally, it has set up the Next Generation Bioprinting platform at a hospital to produce biological implants.
Important Milestones in Organ 3D Printing
Since 2021, there have been considerable developments in the 3D printing of organs. Progress has been made, in particular, in creating bio-inks that can be used to print functional organs and in creating printers that can produce organs at a scale suitable for human use.
Creating bio-inks that can be used to print functional organs has been one of the most significant developments. Bio inks are substances that have living cells and a matrix that supports the cells. The bioink's cells can be designed to develop into particular cell types, such as blood, muscle, or nerve cells. As a result, functional organs like kidneys, livers, and hearts can be printed using bioink. Creating printers that can produce organs at a scale large enough for human use represents another significant achievement. Small things were the only thing that 3D printers could print in the past. However, new printers have been developed that can print items several centimeters in size. As a result, it is now possible to print large enough organs to be transplanted into humans.
The development of 3D printing organs has the potential to transform medicine. Many individuals today rely on organ transplantation as a life-saving procedure, but the supply of donor organs currently constrains it. This issue might be resolved by 3D printing organs, enabling the creation of unique organs for every patient. Millions of lives could be saved via organ transplantation as a result of this.
Before 3D-printed organs may be used in human transplantation, a few obstacles remain to be addressed. The fact that the bio-inks on the market are not as durable as the tissues in the human body presents one difficulty. This indicates that organs created by 3D printing are not yet as robust as they should be for long-term use. Another difficulty is that printing organs in 3D is still expensive. This means that most individuals cannot currently afford 3D-printed organs.
Researchers at 3DBio Therapeutics reported in June 2022 that they had successfully used a patient's cells to 3D bioprint a functional human ear. It has never been done before to 3D bioprint a functioning organ from a patient's cells. Faster and more accurate 3D printers have been created, making them better suited for usage in 3D bioprinting. New 3D printing methods have also been created to manufacture more intricate structures like blood arteries and neurons. In 2023, new bio-inks were created. These bio-inks are more biocompatible, meaning an immunological reaction to them is less likely to occur in the body. Also, stronger and more resilient bio-inks have been created, making them better suited for organ transplants.
Conclusion
A new discipline called "bioprinting" is being developed at the nexus of biology, engineering, and 3D printing. In order to build three-dimensional structures that closely resemble the structure and operation of human tissues and organs, it entails the precise deposition of living cells, biomaterials, and growth factors. Bioprinting has the enormous potential to be used in regenerative medicine, tissue engineering, and drug discovery by carefully layering these components. The production of bioink, a printable substance made of living cells and a binding biomaterial, is the traditional first step in the bioprinting process. The bioink is then applied layer by layer using specialized bioprinters that adhere to a computer-generated design.
After printing, the bioink's cells can multiply, differentiate, and eventually develop into useful tissues. By meeting the rising need for organ transplants, bioprinting has the potential to transform healthcare. It may be able to develop tailored organs using a patient's own cells, lowering the possibility of organ rejection and doing away with the requirement for donor organs. Additionally, bioprinting can produce disease models for medication testing, allowing for a more precise and effective screening of prospective treatments. Although there are still issues to be resolved, such as vascularization and long-term functionality, bioprinting is a revolutionary technique that can potentially change the course of medicine and enhance many people's lives.
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