The Boston Scientific RELIANCE 4-FRONT DF4 ICD Defibrillation Lead (REF 693) is a transvenous defibrillation lead engineered for chronic implantation in the right ventricle as part of a compatible DF4-configured implantable cardioverter defibrillator (ICD) or CRT-D system. The streamlined DF4 connector consolidates the pace/sense and high-voltage conductors into a single in-line terminal pin, supporting a simplified header connection and reduced pocket bulk.

Key Features
Single-coil transvenous defibrillation lead configuration
DF4-LLHH connector standard (ISO 27186) for streamlined single-port ICD/CRT-D headers
Active fixation distal tip (extendable/retractable helix) for stable septal or apical placement
Integrated bipolar pace/sense electrode design
RELIANCE 4-FRONT family construction intended for chronic transvenous use
Compatible with Boston Scientific DF4-compatible ICD and CRT-D pulse generators

Clinical Applications
Intended for use with implantable cardioverter defibrillator systems for sensing, pacing, cardioversion and defibrillation therapy
Right ventricular lead component of single-chamber ICD, dual-chamber ICD or CRT-D system configurations
Transvenous endocardial implantation in patients indicated for ICD therapy per the implanting physician and approved system labeling

Product Information
Brand: Boston Scientific
Product Family: RELIANCE 4-FRONT
REF / UPN: 693
Category: ICD Leads for Implantable Cardioverter Defibrillators
Connector: DF4-LLHH (ISO 27186)
Fixation: Active (extendable/retractable helix)
Coil Configuration: Single-coil (RV)
Lead Body Length: Not specified in the located sources
Lead Body Diameter: Not specified in the located sources
Sterility: Supplied sterile, single-use
Storage: Refer to manufacturer IFU
Always consult the current Boston Scientific Instructions for Use (IFU) for complete indications, contraindications, warnings, precautions, specifications and compatibility prior to implantation.