A medical device, such as an electrophysiology catheter, has an elongate body including a wall. A reinforcing layer is encapsulated in the wall. The reinforcing layer includes one or more reinforcing fibers having glass cores and polymer cladding. In embodiments, the reinforcing fibers are non-magnetically-susceptible and non-electrically-conductive, facilitating the use of the medical device in connection with procedures such as magnetic resonance imaging (“MRI”).
