| http://www.w3.org/ns/prov#value | - The insulation is of flexible, nonabrasive, biocompatible material, such as expanded polytetrafluoroethylene (PTFE) or silicone rubber, and of sufficient thickness and dielectric strength to provide adequate electrical insulation from the local potential gradient, The material is provided with a shape so that when formed to the heart, it partially or fully surrounds the heart, and conforms to the
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