A steerable sheath having a proximal end and a distal end, the steerable sheath comprising a portion (708, 808) that is deflectable and a portion (710, 806) that is non-deflectable, first and second pull wires (818, 1004, 1006) extending through the steerable sheath to the deflectable portion, wherein the deflectable portion is configured to be controllably deflectable by an operator using the pulls wires, an inner liner (700; 1002) extending from a proximal end of a non-deflectable portion (710; 806) of the steerable sheath to a distal end of the deflectable portion (708; 808) of the steerable sheath,, a torque transfer layer (702; 1008) surrounding the inner liner (700; 1002) and extending from the proximal end of the non-deflectable portion (710; 806) of the steerable sheath to the distal end of the deflectable portion (708; 808) of the steerable sheath, a first reflowed polymeric layer (704; 1010) having an outer circumference and surrounding the torque transfer layer (702; 1008), the first reflowed polymeric material extending from the proximal end of the non-deflectable portion (710; 806) of the steerable sheath to the distal end of the deflectable portion (708; 808) of the steerable sheath, a first electrode wire (706; 822; 1012, 1014, 1016, 1018) positioned along a first helical path around the outer circumference of the first reflowed polymeric layer (704; 1010) from the proximal end to a distal end of the non-deflectable portion (710; 806) and positioned along a second helical path around the outer circumference of the first reflowed polymeric layer (704; 1010) from a proximal end of the deflectable portion (708; 808) to the distal end of the deflectable portion, wherein the second helical path has a tighter wind than a wind of the first helical path, and wherein the first electrode wire (706; 822; 1012, 1014, 1016, 1018) is electrically connected to a first electrode (712; 824, 826, 828, 830) positioned on the deflectable portion (708; 808). a portion (708, 808) that is deflectable and a portion (710, 806) that is non-deflectable, first and second pull wires (818, 1004, 1006) extending through the steerable sheath to the deflectable portion, wherein the deflectable portion is configured to be controllably deflectable by an operator using the pulls wires, an inner liner (700; 1002) extending from a proximal end of a non-deflectable portion (710; 806) of the steerable sheath to a distal end of the deflectable portion (708; 808) of the steerable sheath,, a torque transfer layer (702; 1008) surrounding the inner liner (700; 1002) and extending from the proximal end of the non-deflectable portion (710; 806) of the steerable sheath to the distal end of the deflectable portion (708; 808) of the steerable sheath, a first reflowed polymeric layer (704; 1010) having an outer circumference and surrounding the torque transfer layer (702; 1008), the first reflowed polymeric material extending from the proximal end of the non-deflectable portion (710; 806) of the steerable sheath to the distal end of the deflectable portion (708; 808) of the steerable sheath, a first electrode wire (706; 822; 1012, 1014, 1016, 1018) positioned along a first helical path around the outer circumference of the first reflowed polymeric layer (704; 1010) from the proximal end to a distal end of the non-deflectable portion (710; 806) and positioned along a second helical path around the outer circumference of the first reflowed polymeric layer (704; 1010) from a proximal end of the deflectable portion (708; 808) to the distal end of the deflectable portion, wherein the second helical path has a tighter wind than a wind of the first helical path, and wherein the first electrode wire (706; 822; 1012, 1014, 1016, 1018) is electrically connected to a first electrode (712; 824, 826, 828, 830) positioned on the deflectable portion (708; 808).