Electrical lead for cardiac pacemakers, defibrillators

摘要

Implantable lead has at least one helically wound electrical conductor (12), a tubular covering of elastomeric polymer (14) coaxially covering the conductor(s) and an exterior tubular covering of porous PTFE (16) having a microstructure of nodes (24) interconnected with fibrils (22).Pref., the elastomeric polymer is silicone or polyurethane and the PTFE layer is partially adhered to it by silicone adhesive. Pref. the PTFE layer is elastically stretchable and recoverable by at least 1.5 times its relaxed length.