A medical device system (20; 120; 320; 420; 620; 800; 920) for the delivery of energy to a region of a patient's anatomy, the medical device system (20; 120; 320; 420; 620; 800; 920) comprising: an introducer tube (22; 122; 222; 322; 422; 522; 622; 822; 922) defining a lumen (24; 124; 224; 324; 424; 524; 824; 924) therein, the introducer tube (22; 122; 222; 322; 422; 522; 622; 822; 922) being configured to be inserted into the patient's anatomy, the introducer tube (22; 122; 222; 322; 422; 522; 622; 822; 922) being a first electrode (26; 126; 226; 326; 426; 526; 626; 826; 926); and a second electrode (34; 134; 334; 434; 634; 834; 934) being movable within the lumen (24; 124; 224; 324; 424; 524; 824; 924) of the introducer tube (22; 122; 222; 322; 422; 522; 622; 822; 922) between a retracted position and an extended position, wherein in the retracted position, the second electrode (34; 134; 334; 434; 634; 834; 934) is substantially disposed within the lumen (24; 124; 224; 324; 424; 524; 824; 924), and wherein in the extended position, the second electrode (34; 134; 334; 434; 634; 834; 934) extends at least partially beyond the distal end (30; 130; 230; 330; 430; 830; 930) of the introducer tube (22; 122; 222; 322; 422; 522; 622; 822; 922), the first and second electrodes (26, 34; 126, 134; 226; 326, 334; 426, 434; 526; 626, 634; 826, 834; 926, 934) being configured to deliver an energy to a tissue, the introducer tube (22; 122; 222; 322; 422; 522; 622; 822; 922) being configured to substantially hold the second electrode (34; 134; 334; 434; 634; 834; 934) within the lumen (24; 124; 224; 324; 424; 524; 824; 924) in a predetermined orientation in the extended position, the introducer tube (22; 122; 222; 322; 422; 522; 622; 822; 922) preventing the second electrode (34; 134; 334; 434; 634; 834; 934) from substantially rotating within the lumen (24; 124; 224; 324; 424; 524; 824; 924) of the introducer tube (22; 122; 222; 322; 422; 522; 622; 822; 922) during movement into the extended position. an introducer tube (22; 122; 222; 322; 422; 522; 622; 822; 922) defining a lumen (24; 124; 224; 324; 424; 524; 824; 924) therein, the introducer tube (22; 122; 222; 322; 422; 522; 622; 822; 922) being configured to be inserted into the patient's anatomy, the introducer tube (22; 122; 222; 322; 422; 522; 622; 822; 922) being a first electrode (26; 126; 226; 326; 426; 526; 626; 826; 926); and a second electrode (34; 134; 334; 434; 634; 834; 934) being movable within the lumen (24; 124; 224; 324; 424; 524; 824; 924) of the introducer tube (22; 122; 222; 322; 422; 522; 622; 822; 922) between a retracted position and an extended position, wherein in the retracted position, the second electrode (34; 134; 334; 434; 634; 834; 934) is substantially disposed within the lumen (24; 124; 224; 324; 424; 524; 824; 924), and wherein in the extended position, the second electrode (34; 134; 334; 434; 634; 834; 934) extends at least partially beyond the distal end (30; 130; 230; 330; 430; 830; 930) of the introducer tube (22; 122; 222; 322; 422; 522; 622; 822; 922), the first and second electrodes (26, 34; 126, 134; 226; 326, 334; 426, 434; 526; 626, 634; 826, 834; 926, 934) being configured to deliver an energy to a tissue, the introducer tube (22; 122; 222; 322; 422; 522; 622; 822; 922) being configured to substantially hold the second electrode (34; 134; 334; 434; 634; 834; 934) within the lumen (24; 124; 224; 324; 424; 524; 824; 924) in a predetermined orientation in the extended position, the introducer tube (22; 122; 222; 322; 422; 522; 622; 822; 922) preventing the second electrode (34; 134; 334; 434; 634; 834; 934) from substantially rotating within the lumen (24; 124; 224; 324; 424; 524; 824; 924) of the introducer tube (22; 122; 222; 322; 422; 522; 622; 822; 922) during movement into the extended position.