Plastic in Implantable Medical Devices is Not Suitable
Scientists have discovered a previously unrecognized way that degradation can occur in silicone-urethane plastics that are often considered for use in medical devices. Their study, published in ACS’ journal Macromolecules, could have implications for device manufacturers considering use of these plastics in the design of some implantable devices, including cardiac defibrillation leads.
Kimberly Chaffin, Marc Hillmyer, Frank Bates, from the Univ. of Minnesota, and colleagues explain that some implanted biomedical devices, such as pacemakers and defibrillators, have parts made of a plastic consisting of polyurethane and silicone. While these materials have been extensively studied for failure due to interaction with oxygen, no published study has looked at interaction with water as a potential failure mechanism in this class of materials.
Read more: http://www.laboratoryequipment.com/news/2012/12/plastic-implantable-medical-devices-not-suitable