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Filling me softly
Date:2/12/2014

Surgical implants are widely used in modern medicine but their effectiveness is often compromised by how our bodies react to them. Now, scientists at the University of Cambridge have discovered that implant stiffness is a major cause of this so-called foreign body reaction.

This is the first time that stiffness of implant materials has been shown to be involved in foreign body reactions. The findings published in the journal Biomaterials could lead to major improvements in surgical implants and the quality of life of patients whose lives depend on them.

Foreign bodies often trigger a process that begins with inflammation and ends with the foreign body being encapsulated with scar tissue. When this happens after an accident or injury, the process is usually vital to healing, but when the same occurs around, for example, electrodes implanted in the brain to alleviate tremor in Parkinson's disease, it may be problematic.

Despite decades of research, the process remains poorly understood as neither the materials from which these implants are made, nor their electrical properties, can explain what triggers inflammation.

Instead of looking for classical biological causes, a group of Cambridge physicists, engineers, chemists, clinical scientists and biologists decided to take a different tack and examine the impact of an implant's stiffness on the inflammatory process.

According to Dr Kristian Franze, one of the authors of the study: "Electrodes that are implanted in the brain, for example, should be chemically inert, and these foreign body reactions occur whether or not these electrodes are switched on, so it's not the electrical signalling.

"We thought that an obvious difference between electrodes and brain tissue is stiffness. Brain tissue is as soft as cream cheese, it is one of the softest tissues in the body, and electrodes are orders of magnitude stiffer."

To test their hypothesis that mec
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Contact: Becky Allen
Becky.Allen@admin.cam.ac.uk
44-012-233-32300
University of Cambridge
Source:Eurekalert  

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