Medical device and MedTech insights, news, tips and more

Graphene spikes on implants can kill harmful bacteria

April 24, 2018

Photo: Johan Bodell

A tiny layer of graphene flakes becomes a deadly weapon and kills bacteria, stopping infections during procedures such as implant surgery. This is the findings of new research from Chalmers University of Technology, Sweden, recently published in the scientific journal Advanced Materials Interfaces.

​Operations for surgical implants, such as hip and knee replacements or dental implants, have increased in recent years. However, in such procedures, there is always a risk of bacterial infection. In the worst case scenario, this can cause the implant to not attach to the skeleton, meaning it must be removed.

Bacteria travel around in fluids, such as blood, looking for a surface to cling on to. Once in place, they start to grow and propagate, forming a protective layer, known as a biofilm.

A research team at Chalmers has now shown that a layer of vertical graphene flakes forms a protective surface that makes it impossible for bacteria to attach. Instead, bacteria are sliced apart by the sharp graphene flakes and killed. Coating implants with a layer of graphene flakes can therefore help protect the patient against infection, eliminate the need for antibiotic treatment, and reduce the risk of implant rejection. The osseointegration – the process by which the bone structure grow to attach the implant – is not disturbed. In fact, the graphene has been shown to benefit the bone cells.

Chalmers University is a leader in the area of graphene research, but the biological applications did not begin to materialise until a few years ago. The researchers saw conflicting results in earlier studies. Some showed that graphene damaged the bacteria, others that they were not affected.

“We discovered that the key parameter is to orient the graphene vertically. If it is horizontal, the bacteria are not harmed” says Ivan Mijakovic, Professor at the Department of Biology and Biological Engineering.

The sharp flakes do not damage human cells. The reason is simple: one bacterium is one micrometer – one thousandth of a millimeter – in diameter, while a human cell is 25 micrometers. So, what constitutes a deadly knife attack for a bacterium, is therefore only a tiny scratch for a human cell.

Read More at the Source: Spikes of graphene can kill bacteria on implants | Chalmers


By: Mia Malmstedt
Photo: Johan Bodell

More insights

March 7, 2024
FDA Clears Dexcom’s First Over-the-Counter Continuous Glucose Monitor
Learn More
March 1, 2024
FDA greenlights Boston Scientific’s Novel Drug-Coated Balloon for Coronary In-Stent Restenosis
Learn More
February 21, 2024
Sparrow BioAcoustics Launches Software That Turns a Smartphone into a Stethoscope 
Learn More

Begin your legacy now. We are your medtech and medical device talent advisory firm.