3D Printers in Medicine: Amazing Technology and Uses

Updated on May 30, 2018
AliciaC profile image

Linda Crampton teaches science and information technology. She enjoys learning about new technology and exploring its applications.

Researchers have made ears with the help of a 3D printer.
Researchers have made ears with the help of a 3D printer. | Source

Exciting Creations

3D printing is an exciting innovation in technology that has many useful applications. One fascinating and potentially very important application of 3D printers is the creation of materials that can be used in medicine. These materials include implantable medical devices, artificial body parts or prosthetics, and customized medical instruments. They also include printed patches of living human tissue as well as mini organs. In the future, implantable organs may be printed.

3D printers have the ability to print solid, three dimensional objects based on a digital model stored in a computer's memory. A common printing medium is liquid plastic that solidifies after printing, but other media are available. These include powdered metal and "inks" containing living cells.

The ability of printers to produce materials that are compatible with the human body is improving rapidly. Some of the materials are already used in medicine while others are still in the experimental stage. Many researchers are involved in the investigation. 3D printing has the tantalizing potential to transform medical treatment.

A 3D Printer in Action

How Does a 3D Printer Work?

The first step in the creation of a three dimensional object by a printer is to design the object. This is done in a CAD (Computer Aided Design) program. Once the design is finished, another program creates instructions for producing the object in a series of layers. This second program is sometimes known as a slicing program or as slicer software, since it converts the CAD code for the entire object into code for a series of slices or horizontal layers. The layers may number in the hundreds or even in the thousands.

The printer creates the object by depositing layers of material according to the slicer program's instructions, starting at the bottom of the object and working upwards. Successive layers are fused together. The process is referred to as additive manufacturing.

Plastic filament is often used as a medium for 3D printing, especially in consumer-oriented printers. The printer melts the filament and then extrudes hot plastic through a nozzle. The nozzle moves in all dimensions as it releases the liquid plastic in order to create an object. The movement of the nozzle and the amount of plastic that is extruded are controlled by the slicer program. The hot plastic solidifies almost immediately after it's released from the nozzle.

The ear consists of more than just the visible part.
The ear consists of more than just the visible part. | Source

The part of the ear that is visible from the outside of the body is known as the pinna or auricle. The rest of the ear is located in the skull. The function of the pinna is to collect sound waves and send them to the next section of the ear.

Making an Ear

In February 2013, scientists at Cornell University in the United States announced that they had been able to make an ear pinna with the aid of 3D printing. The steps followed by the Cornell scientists were as follows.

  • A model of an ear was created in a CAD program. The researchers used photographs of real ears as the basis for this model.
  • The ear model was printed by a 3D printer, using plastic to create a mold with the shape of the ear.
  • A hydrogel containing a protein called collagen was placed inside the mold. A hydrogel is a gel that contains water.
  • Chondrocytes (cells that produce cartilage) were obtained from a cow's ear and added to the collagen.
  • The collagen ear was placed in a nutrient solution in a lab dish. While the ear was in the solution, some of the chondrocytes replaced the collagen.
  • The ear was then implanted in the back of a rat under its skin.
  • After three months, the collagen in the ear had been completed replaced with cartilage and the ear had maintained its shape and distinction from the surrounding rat cells.

Difference Between a Mold and a Scaffold

In the ear creation process described above, the plastic ear was an inert mold. Its sole function was to provide the correct shape for the ear. The collagen ear that formed inside the mold acted as a scaffold for the chondrocytes. In tissue engineering, a scaffold is a biocompatible material with a specific shape on and in which cells grow. The scaffold not only has the correct shape but also has properties that support the life of the cells.

Since the original ear creation process was performed, the Cornell researchers have found a way to print a collagen scaffold with the correct shape needed to make an ear, eliminating the requirement for a plastic mold.

Rib cartilage (shown in red) is sometimes used to make a replacement ear.
Rib cartilage (shown in red) is sometimes used to make a replacement ear. | Source

Potential Benefits of Printed Ears

Ears made with the aid of printers could be useful for people who have lost their own ears due to injury or disease. They could also help people who were born without ears or have ones that haven't developed properly.

At the moment, replacement ears are sometimes made from cartilage in a patient's rib. Obtaining the cartilage is an unpleasant experience for the patient and can damage the rib. In addition, the resulting ear may not look very natural. Ears are also made from an artificial material, but once again the result may not be completely satisfactory. Printed ears have the potential to look more like natural ears and to work more efficiently.

An artificial mandible, or lower jaw, has been created by a 3D printer.
An artificial mandible, or lower jaw, has been created by a 3D printer. | Source

In March 2013, a company called Oxford Performance Materials reported that they had replaced 75% of a man's skull with a printed polymer skull. 3D printers are also used to make health care appliances, such as prosthetic limbs, hearing aids, and dental implants.

Printing a Lower Jaw

In February 2012, Dutch scientists reported that they had created an artificial lower jaw with a 3D printer and implanted it into the face of an 83-year-old woman. The jaw was made from layers of titanium metal powder fused by heat and was covered by a bioceramic coating. Bioceramic materials are compatible with human tissue.

The woman received the artificial jaw because she had a chronic bone infection in her own lower jaw. Doctors felt that traditional facial reconstruction surgery was too risky for the woman because of her age.

The jaw had joints so that it could be moved, as well as cavities for muscle attachment and grooves for blood vessels and nerves. The woman was able to say a few words as soon as she woke up from the anesthetic. The next day she was able to swallow. She went home after four days. False teeth were scheduled to be implanted into the jaw at a later date.

Printed structures are also being used in medical training and in pre-surgical planning. A three dimensional model created from a patient's medical scans can be very useful for surgeons, since it can show the specific conditions inside the patient's body. This may simplify complex surgery.

Prosthetics and Implantable Items

The metal jaw described above is a type of prosthetic, or artificial body part. The production of prosthetics is an area in which 3D printers are becoming important. Some hospitals now have their own printers or are working in cooperation with a medical supply company that has a printer.

The creation of a prosthetic by 3D printing is often a quicker and cheaper process than the creation by conventional manufacturing methods. In addition, it's easier to create a customized fit for a patient when a device is specifically designed and printed for the person. Hospital scans can be used to create tailored devices.

Replacement limbs are often 3D printed today, at least in some parts of the world. In late 2015, printed vertebrae were successfully placed in a patient. Patients have also received a printed sternum and a ribcage. 3D printing is used to produce improved dental implants. Replacement hip joints are often printed. Catheters that fit the specific size and shape of a passage in a patient's body could soon be common.

There are some drawbacks to the 3D printing of prosthetics and implantable items. The printer can be expensive and people that can use appropriate software and hardware are required. The process has many benefits, however.

Bioprinting with Living Cells: A Possible Future

Printing with living cells, or bioprinting, is happening today. It's a delicate process. The cells mustn't get too hot. Most methods of 3D printing involve high temperatures, which would kill cells. In addition, the carrier liquid for the cells mustn't harm them. The liquid and the cells that it contains is known as a bio-ink (or a bioink).

Organ and Tissue Replacement

The replacement of damaged organs with organs made from 3D printers would be a wonderful revolution in medicine. At the moment there aren't enough donated organs available for everyone who needs them.

The plan is to take cells from a patient's own body in order to print an organ that they need. This process should prevent organ rejection. The cells would likely be stem cells, which are unspecialized cells that are capable of producing other cell types when they are stimulated correctly. The different cell types would be deposited by the printer in the correct order. Researchers are discovering that at least some kinds of human cells have an amazing ability to self-organize when they are deposited, which would be very helpful in the process of creating an organ.

A special type of 3D printer known as a bioprinter is used to make living tissue. In a common method of making the tissue, a hydrogel is printed from one printer head to form a scaffold. Tiny liquid droplets, each containing many thousands of cells, are printed on to the scaffold from another printer head. The droplets soon join and the cells become attached to each other. When the desired structure has formed, the hydrogel scaffold is removed. It may be peeled away or it may be washed away if it's water soluble. Biodegradable scaffolds may also be used. These gradually break down inside a living body.

In medicine, a transplant is the transfer of an organ or tissue from a donor to a recipient. An implant is the insertion of an artificial device into the patient's body's. 3D bioprinting falls somewhere between these two extremes. Both "transplant" and "implant" are used when referring to items produced by a bioprinter.

Bioprinting Successes So Far

Non-living implants and prosthetics created by 3D printers are already used in humans. The use of implants containing living cells requires more research, which is being performed. Entire organs can't yet be made by 3D printing, but sections of organs can. Many different structures have been printed, including patches of heart muscle that are able to beat, skin patches, segments of blood vessels, and knee cartilage. These haven't yet been implanted into humans. In 2017, scientists presented a prototype of a printer that can create human skin for implantation, however, and in 2018 other scientists printed corneas in a process that may one day be used to repair damage in eyes.

Some hopeful discoveries were reported in 2016. A team of scientists implanted three types of bioprinted structures under the skin of mice. These included a baby-sized human ear pinna, a piece of muscle, and a section of human jaw bone. Blood vessels from the surroundings extended into all of these structures while they were in the bodies of the mice. This was an exciting development, since a blood supply is necessary in order to keep tissues alive. The blood carries nutrients to living tissues and takes away their wastes.

It was also exciting to note that the implanted structures were able to stay alive until the blood vessels had developed. This feat was accomplished by the existence of tiny pores in the structures that allowed nutrients to enter them.

Printing Parts of the Heart

Creating a Cornea

Scientists at Newcastle University in the UK have created 3D-printed corneas. The cornea is the transparent, outermost covering of our eyes. Serious damage to this covering can cause blindness. A corneal transplant often solves the problem, but there aren’t enough corneas available to help everyone who needs them.

The scientists obtained stem cells from a healthy human cornea. The cells were then placed in a gel made of alginate and collagen. The gel protected the cells as they travelled through the single nozzle of the printer. Less than ten minutes were needed to print the gel and the cells in the correct shape. The shape was obtained by scanning a person's eye. (In a medical situation, the patient's eye would be scanned.) Once the gel and cell mixture was printed, the stem cells produced a complete cornea.

The corneas made by the printing process have not yet been implanted into human eyes. It will probably be some time before they are. They have the potential to help many people, however.

Benefits of Mini Organs, Organoids, or Organs on a Chip

Scientists have been able to create mini organs by 3D printing (and by other methods). "Mini organs" are miniature versions of organs, sections of organs, or patches of tissue from specific organs. They are referred to by various names in addition to the term mini organ. The printed creations may not contain every type of structure found in the full-size organ, but they are good approximations. Research indicates that they could have important uses, even though they aren't implantable.

Mini organs are not always produced from cells supplied by a random donor. Instead, they are often made from the cells of a person who has a disease. Researchers can check the effects of medications on the mini organ. If a drug is found to be helpful and not harmful, it may be given to the patient. There are several advantages to this process. One is that a medication that is likely to be beneficial for the patient's specific version of a disease and for their specific genome can be used, which increases the likelihood of a successful treatment. Another is that doctors may be able to obtain an unusual or normally expensive drug for a patient if they can demonstrate that the drug is likely to be effective. In addition, testing drugs on mini organs may reduce the need for lab animals.

Some Challenges for Bioprinting

Creating an organ that is suitable for implantation is a difficult task. An organ is a complex structure containing different cell types and tissues arranged in a specific pattern. In addition, as organs develop during embryonic development, they receive chemical signals that enable their fine structure and intricate behaviour to develop properly. This signals are lacking when we try to create an organ artificially.

Some scientists think that at first—and perhaps for some time to come—we will print implantable structures that can perform a single function of an organ instead of all of its functions. These simpler structures may be very useful if they compensate for a serious defect in the body.

Though it's likely to be years before bioprinted organs are available for implants, we may well see new benefits of the technology before then. The pace of research seems to be increasing. The future of 3D printing in relation to medicine should be very interesting as well as exciting.

References

  • Stromberg, Joseph. "An Artificial Ear Created By a 3D Printer and Living Cartilage Cells." Smithsonian Magazine. http://www.smithsonianmag.com/science-nature/an-artificial-ear-built-by-a-3d-printer-and-living-cartilage-cells-23720427/ (accessed September 19, 2017).
  • "Transplant jaw made by 3D printer claimed as first." BBC. http://www.bbc.com/news/technology-16907104 (accessed September 19, 2017).
  • Radford, Tim. "Bioprinter creates bespoke lab-grown body parts for transplant." The Guardian. https://www.theguardian.com/science/2016/feb/15/bioprinter-creates-bespoke-lab-grown-body-parts-for-transplant (accessed September 20, 2017).
  • "First 3D-printed human cornea." Eurekalert. https://www.eurekalert.org/pub_releases/2018-05/nu-f3p052918.php (accessed May 30, 2018).
  • Coghlan, Andy. "3D printer makes tiniest human liver ever." New Scientist. https://www.newscientist.com/article/dn23419-3d-printer-makes-tiniest-human-liver-ever/ (accessed September 20, 2017).
  • Ceurstemont, Sandrine. "Mini 3D printed organs mimic beating heart and liver." New Scientist. https://www.newscientist.com/article/dn27383-mini-3d-printed-organs-mimic-beating-heart-and-liver/ (accessed September 20, 2017).
  • "This New 3D Printer Makes Life-Sized Ear, Muscle, and Bone Tissue From Living Cells." Science Alert. https://www.sciencealert.com/new-3d-printer-produces-first-ever-life-sized-ear-muscle-and-bone-tissues-from-living-cells (accessed September 20, 2017).
  • Universidad Carlos III de Madrid - Oficina de Información Científica. "3-D bioprinter to print human skin." ScienceDaily. www.sciencedaily.com/releases/2017/01/170123090630.htm (accessed September 20, 2017).

Questions & Answers

    © 2013 Linda Crampton

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      • AliciaC profile imageAUTHOR

        Linda Crampton 

        17 months ago from British Columbia, Canada

        I think you're right. The technology is exciting!

      • aesta1 profile image

        Mary Norton 

        17 months ago from Ontario, Canada

        I have seen what these printers have done to prosthetics and was very much impressed. This is just the beginning.

      • AliciaC profile imageAUTHOR

        Linda Crampton 

        4 years ago from British Columbia, Canada

        Hi, tammiejo67. I agree - the medical applications of 3D printing are very exciting! Thanks for the comment.

      • tammiejo67 profile image

        Tammie Hardrick 

        4 years ago from Illinois

        The future of 3D printing in medicine is exciting. Thank you!

      • AliciaC profile imageAUTHOR

        Linda Crampton 

        5 years ago from British Columbia, Canada

        3D printing is amazing technology! Thanks for the visit, Ingenira.

      • Ingenira profile image

        Ingenira 

        5 years ago

        Amazing technology and printer !

      • AliciaC profile imageAUTHOR

        Linda Crampton 

        5 years ago from British Columbia, Canada

        Thank you very much for the comment and the vote, Glenn. I agree - there is so much to look forward to in 3D printer technology! The future should be very interesting and very exciting.

      • Glenn Stok profile image

        Glenn Stok 

        5 years ago from Long Island, NY

        I find it interesting that we are already living in an age where the possibilities are becoming "real" for enabling the creation of working body-parts for organ transplants by using stem-cell 3-D printing.

        We have so much to look forward to. You did a great job in researching this and writing about it with so much detail. Voted up.

      • AliciaC profile imageAUTHOR

        Linda Crampton 

        5 years ago from British Columbia, Canada

        Thank you very much for the comment, Insightful Tiger. I've heard about the gun too, but I'm not happy about the use of 3D printers for this purpose. The medical applications of the printers are wonderful, though! I appreciate your visit and votes.

      • Insightful Tiger profile image

        Insightful Tiger 

        5 years ago

        This is absolutely fascinating! I was just watching a show on how one could make a working gun with one of these. From your article I can see that there are many benefits as well. Well done! Voted up and interesting.

      • AliciaC profile imageAUTHOR

        Linda Crampton 

        5 years ago from British Columbia, Canada

        Hi, Beckie. It is amazing to see how far technology has progressed! The future should be exciting. Thanks for the visit.

      • shiningirisheyes profile image

        Shining Irish Eyes 

        5 years ago from Upstate, New York

        Absolutely remarkable how far technological advancements have reached. So many benefit from these beneficial concepts. Great article.

      • AliciaC profile imageAUTHOR

        Linda Crampton 

        5 years ago from British Columbia, Canada

        Hi, Kathi. I agree - this is very promising technology. I'm looking forward to the future!

      • Fossillady profile image

        Kathi 

        5 years ago from Saugatuck Michigan

        This is promising and remarkable information. Just think, a few years from now, if they could replace the lungs and heart. Glad, I learned of this today!

      • AliciaC profile imageAUTHOR

        Linda Crampton 

        5 years ago from British Columbia, Canada

        Hi, Deb. Yes, the abilities - and potential abilities - of 3D printers with respect to medicine are remarkable! Thank you for the visit and the comment.

      • aviannovice profile image

        Deb Hirt 

        5 years ago from Stillwater, OK

        This is quite remarkable, and it sure makes things a lot easier, less chance for errors, too. Great workup!

      • AliciaC profile imageAUTHOR

        Linda Crampton 

        5 years ago from British Columbia, Canada

        Hi, Tom. Yes, these printers are amazing! They have so many uses. I think their medical applications are especially interesting. Thank you very much for the votes and the share!

      • kashmir56 profile image

        Thomas Silvia 

        5 years ago from Massachusetts

        Hi my friend great article, I have see these printers in action on videos and it is pretty amazing what they can do. Thanks for all the informative information it was very interesting to read. Well done !

        Vote up and more !!! Sharing !

      • AliciaC profile imageAUTHOR

        Linda Crampton 

        5 years ago from British Columbia, Canada

        Thanks for the comment, FlourishAnyway. I appreciate it! I hope the medical possibilities of 3D printing become realities. The results obtained so far are very promising.

      • FlourishAnyway profile image

        FlourishAnyway 

        5 years ago from USA

        This is truly amazing, almost beyond comprehension. I heard about this but did not bother to seek out additional information. Thanks for supplying it in an engaging, easy to understand format.

      • AliciaC profile imageAUTHOR

        Linda Crampton 

        5 years ago from British Columbia, Canada

        Hi, Stephanie. "Other-worldly" is a great way to describe the amazing medical possibilities of 3D printers! Thank you very much for the visit and the comment.

      • Stephanie Henkel profile image

        Stephanie Henkel 

        5 years ago from USA

        The whole concept of printed ears and body organs is just other-worldly! The advances in science and medical science are unbelievable! Your article is fascinating, and it's a bit mind boggling, too, to think that these sci fi concepts are actually becoming reality. Great on job writing and researching this article!

      • AliciaC profile imageAUTHOR

        Linda Crampton 

        5 years ago from British Columbia, Canada

        Thanks for sharing the information, Bill. Yes, the technology does offer amazing possibilities! It will be very interesting to see how it develops over time. Thank you very much for the vote and the share.

      • bdegiulio profile image

        Bill De Giulio 

        5 years ago from Massachusetts

        Hi Alicia. I have heard of this technology. In the aerospace industry they are testing this to make solid models. It looks like the sky is the limit for this exciting new technology. Can't wait to see where it takes us? Great job. Voted up, shared, etc.

      • AliciaC profile imageAUTHOR

        Linda Crampton 

        5 years ago from British Columbia, Canada

        Thanks for the comment and the vote, drbj. The potential of 3D printers is mind-blowing! Some people are predicting that as the printers become less expensive more people will buy them, which will change the way in which we obtain manufactured goods in our lives. The early signs with respect to their abilty to treat medical problems are very hopeful, too.

      • drbj profile image

        drbj and sherry 

        5 years ago from south Florida

        This information is truly mind-blowing, Alicia. It's almost as if science has stepped through Alice's Looking Glass to find ways in which 3D printers can benefit human beings with new ears, jaws, prosthetics and who knows, perhaps one day even human organs. Excellent research, m'dear, and voted Up!

      • AliciaC profile imageAUTHOR

        Linda Crampton 

        5 years ago from British Columbia, Canada

        I agree, Bill - this is incredible! The future should be very exciting. It will be so interesting to see what develops from 3D printing technology. Thanks for the visit.

      • billybuc profile image

        Bill Holland 

        5 years ago from Olympia, WA

        That is so incredible I don't even know what to say about it. Now there is a first...billybuc is speechless. LOL Technology has advanced into the Star Wars realm now. Thank you for a fascinating bit of information.

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