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Researchers coat spinal polymer implants with bioactive film to improve bonding with bone

Date:
February 19, 2013
Source:
North Carolina State University
Summary:
Researchers have for the first time successfully coated polymer implants with a bioactive film. The discovery should improve the success rate of such implants -- which are often used in spinal surgeries.

The top scanning electron microscope image (b) shows a cross section of the bioactive hydroxyapatite/YSZ coating without heat treatment. Note how the two layers are distinct. The bottom image (f) shows the coating after heat treatment. Note how the layers are now integrated.
Credit: Image courtesy of North Carolina State University

Researchers from North Carolina State University have for the first time successfully coated polymer implants with a bioactive film. The discovery should improve the success rate of such implants -- which are often used in spinal surgeries.

The polymer used in these implants, called PEEK, does not bond well with bone or other tissues in the body. This can result in the implant rubbing against surrounding tissues, which can lead to medical complications and the need for additional surgeries.

"We wanted to apply a bioactive coating that would allow the polymer implants to bond with surrounding tissues," says Dr. Afsaneh Rabiei, an associate professor of mechanical and aerospace engineering at NC State and lead author of a paper on the research. "The challenge was that these coatings need to be heated to 500 degrees Celsius, but the polymer melts at 300 C. We've finally solved the problem."

The first step in the new technique coats the implant with a thin film of yttria-stabilized zirconia (YSZ). The second step applies a coating of hydroxyapatite, which is a calcium phosphate that bonds well with bone. The researchers then heat the hydroxyapatite layer using microwaves. The YSZ layer acts as a heat shield, preventing the PEEK from melting. Meanwhile, the heat gives the hydroxyapatite a crystalline structure that makes it more stable in the body, meaning that the calcium phosphate will dissolve more slowly -- promoting bonding with surrounding bone.

"We have received funding from the National Institutes of Health to proceed with animal testing to fine-tune this technique," Rabiei says. "Then we will move on to clinical testing."

The research was supported, in part, by the National Science Foundation.


Story Source:

The above story is based on materials provided by North Carolina State University. Note: Materials may be edited for content and length.


Journal Reference:

  1. Afsaneh Rabiei, Stefan Sandukas. Processing and evaluation of bioactive coatings on polymeric implants. Journal of Biomedical Materials Research Part A, 2013; DOI: 10.1002/jbm.a.34557

Cite This Page:

North Carolina State University. "Researchers coat spinal polymer implants with bioactive film to improve bonding with bone." ScienceDaily. ScienceDaily, 19 February 2013. <www.sciencedaily.com/releases/2013/02/130219102548.htm>.
North Carolina State University. (2013, February 19). Researchers coat spinal polymer implants with bioactive film to improve bonding with bone. ScienceDaily. Retrieved August 1, 2014 from www.sciencedaily.com/releases/2013/02/130219102548.htm
North Carolina State University. "Researchers coat spinal polymer implants with bioactive film to improve bonding with bone." ScienceDaily. www.sciencedaily.com/releases/2013/02/130219102548.htm (accessed August 1, 2014).

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