Featured Product
This Week in Quality Digest Live
Health Care Features
Bob Holmes
Public health messages should be loud and clear, so that everyone listens and stays safe. But that’s easier said than done.
Donald J. Wheeler
The purpose of analysis is insight
Lola Butcher
Virtual healthcare has been pushed into the mainstream. Will we go back to doctors’ waiting rooms?
Donald J. Wheeler
What happened in July?
Greg Hutchins
Risk is becoming our lens for everything from managing, to working, and even going to the store.

More Features

Health Care News
Despite being far from campus because of the pandemic, some students are engineering a creative way to stay connected
Good quality is adding an average of 11 percent to organizations’ revenue growth
Further enhances change management capabilities
Stereotactic robot helps identify target and deliver electrodes to target with submillimetric accuracy
How the nation’s leading multistate cannabis company ensures quality and safety standards
ISO and WHO are working for universal access to quality health products that are all at once safe, effective, and affordable
Certification bodies can conduct food safety audits and issue certifications of foreign food facilities
Creates adaptive system for managing product development and post-market quality for devices with software elements
Transforming a dysfunctional industry

More News

Kayla Wiles

Health Care

Lasers Could Turn Regular Metal Surfaces Into Bacteria Killers

The technique could easily translate into existing medical device manufacturing processes

Published: Wednesday, July 8, 2020 - 12:01

A new laser treatment method could potentially turn any metal surface into a rapid bacteria killer just by giving it a different texture, researchers say. In a new study, they demonstrated that this technique allows the surface of copper to immediately kill off superbugs such as MRSA.

“Copper has been used as an antimicrobial material for centuries,” says Rahim Rahimi, an assistant professor of materials engineering at Purdue University. “But it typically takes hours for native copper surfaces to kill off bacteria. We developed a one-step laser-texturing technique that effectively enhances the bacteria-killing properties of copper’s surface.”

A laser prepares to texture the surface of copper, enhancing its antimicrobial properties. (Credit: Kayla Wiles/Purdue)

The technique is not yet tailored to killing viruses such as the one responsible for the Covid-19 pandemic, which is much smaller than bacteria.

Since publishing this work, however, Rahimi’s team has begun testing this technology on the surfaces of other metals and polymers used to reduce risks of bacterial growth, and biofilm formation on devices such as orthopedic implants or wearable patches for chronic wounds.

Giving implants an antimicrobial surface would prevent the spread of infection and antibiotic resistance, Rahimi says, because there wouldn’t be a need for antibiotics to kill off bacteria from an implant’s surface.

The technique might apply to metallic alloys also known to have antimicrobial properties.

Metals such as copper normally have a really smooth surface, which makes it difficult for the metal to kill bacteria by contact.

The technique Rahimi’s team developed uses a laser to create nanoscale patterns on the metal’s surface. The patterns produce a rugged texture that increases surface area, allowing more opportunity for bacteria to hit the surface and rupture on the spot.

Researchers in the past have used various nanomaterial coatings to enhance the antimicrobial properties of metal surfaces, but these coatings are prone to leach off and can be toxic to the environment.

“We’ve created a robust process that selectively generates micron and nanoscale patterns directly onto the targeted surface without altering the bulk of the copper material,” says Rahimi, whose lab develops innovative materials and biomedical devices to address healthcare challenges.

The laser-texturing has a dual effect: The technique not only improves direct contact, but also makes a surface more hydrophilic. For orthopedic implants, such a surface allows bone cells to more strongly attach, improving how well the implant integrates with bone. Rahimi’s team observed this effect with fibroblast cells.

Due to the simplicity and scalability of the technique, the researchers believe that it could easily translate into existing medical-device manufacturing processes.

The study appears in the journal, Advanced Materials Interfaces. Funding for the work came, in part, from Purdue’s School of Materials Engineering and the Wabash Heartland Innovation Network. Source: Purdue University. Original study DOI: 10.1002/ad

 

Discuss

About The Author

Kayla Wiles’s picture

Kayla Wiles

Kayla Wiles is an engineering sciences writer/communications specialist for Purdue News Service.