The Boston Scientific RELIANCE 4-FRONT DF4 ICD Defibrillation Lead (REF 675) is a transvenous implantable cardioverter defibrillator (ICD) lead designed for use with compatible Boston Scientific DF4-LLHH pulse generators. The RELIANCE 4-FRONT lead family is engineered to deliver pacing, sensing, and high-voltage defibrillation therapy through a single in-line DF4 connector, helping to streamline the header connection in modern ICD and CRT-D systems.
Key Features
Single in-line DF4-LLHH connector compatible with Boston Scientific DF4 ICD and CRT-D pulse generators.
Dual-coil transvenous defibrillation lead configuration with RV and SVC shock coils for high-voltage therapy delivery.
GORE expanded PTFE (ePTFE) coating on the shock coils intended to support lead extractability characteristics described in the manufacturer IFU.
Active fixation distal tip with extendable/retractable helix for stable right ventricular placement.
Steroid-eluting collar at the tip designed to help mitigate acute pacing threshold rise.
Silicone with polyurethane co-extrusion outer insulation engineered for mechanical durability.
Bipolar true sensing and pacing configuration between the tip and ring electrodes.
Clinical Applications
Intended for chronic transvenous implantation in the right ventricle as part of an implantable cardioverter defibrillator or cardiac resynchronization therapy defibrillator (CRT-D) system.
Used to deliver sensing of intracardiac electrograms, antibradycardia and antitachycardia pacing, and high-voltage defibrillation therapy in patients indicated for ICD therapy per the prescribing physician and the manufacturer Instructions for Use.
Suitable for use only with pulse generators bearing a compatible DF4-LLHH header port; refer to the official Boston Scientific compatibility matrix before implant.
Product Information
Brand: Boston Scientific
Product Family: RELIANCE 4-FRONT
Model / REF: 675
Category: ICD Leads for Implantable Cardioverter Defibrillators
Connector Standard: DF4-LLHH (IS-4/DF-4)
Lead Configuration: Dual-coil, active fixation, bipolar pace/sense
Fixation: Active (extendable/retractable helix)
Insulation: Silicone with polyurethane co-extrusion (per manufacturer literature)
Lead Body Diameter / Usable Length: Not specified in the located sources
Sterilization: Provided sterile, single use (refer to IFU)
Storage and Handling: Per Boston Scientific Instructions for Use
Regulatory Status: Refer to Boston Scientific official documentation for region-specific clearances and approvals.
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