An implantable cardiac rhythm management (CRM) system for directing stimulation energy toward a target tissue and away from unwanted tissues for providing an appropriate stimulation is provided by the present invention. The implantable cardiac rhythm management (CRM) system includes an implantable lead. The implantable lead includes a lead body and an electrically insulating member. The lead body includes at least one electrode extending substantially around the lead body. The electrically insulating member defines at least one window. At least one insulating member includes a protruding portion configured to urge at least one electrode toward the target tissue.
