A surgical instrument comprising: (a) a sheath configured to be inserted into a nasal cavity of a patient's head; and (b) an energy catheter disposed within the sheath, wherein the energy catheter includes: (i) a shaft extending along a longitudinal axis, and (ii) an elongate, expandable end effector extending distally from the shaft and configured to selectively expand radially outwardly from a non-expanded state to an expanded state, wherein the end effector includes a plurality of loop-shaped energy members (150a, 150b), each of the plurality of loop-shaped energy members comprising: at least one flexible wire, wherein the at least one flexible wire is resiliently biased to define a bulbous shape of the loop shaped energy member, and a plurality of electrodes (170a, 170b) disposed along the at least one flexible wire wherein each of the plurality of loop-shaped energy members extends along a respective plane, wherein each respective plane is parallel to and laterally offset from the longitudinal axis; wherein the plurality of loop-shaped energy members overlap each other; wherein the energy catheter is selectively translatable relative to the sheath between a proximal retracted position in which the end effector is housed coaxially within the sheath to thereby prevent the end effector from radially expanding from the non-expanded state to the expanded state, and a distal extended position in which the end effector is exposed from the sheath to thereby permit the end effector to expand from the non-expanded state to the expanded state for contacting tissue in the nasal cavity of the patient's head, wherein when the end effector is in the expanded state, the end effector has a width and a length greater than the width. (a) a sheath configured to be inserted into a nasal cavity of a patient's head; and (b) an energy catheter disposed within the sheath, wherein the energy catheter includes: (i) a shaft extending along a longitudinal axis, and (ii) an elongate, expandable end effector extending distally from the shaft and configured to selectively expand radially outwardly from a non-expanded state to an expanded state, wherein the end effector includes a plurality of loop-shaped energy members (150a, 150b), each of the plurality of loop-shaped energy members comprising: at least one flexible wire, wherein the at least one flexible wire is resiliently biased to define a bulbous shape of the loop shaped energy member, and a plurality of electrodes (170a, 170b) disposed along the at least one flexible wire wherein each of the plurality of loop-shaped energy members extends along a respective plane, wherein each respective plane is parallel to and laterally offset from the longitudinal axis; wherein the plurality of loop-shaped energy members overlap each other; (i) a shaft extending along a longitudinal axis, and (ii) an elongate, expandable end effector extending distally from the shaft and configured to selectively expand radially outwardly from a non-expanded state to an expanded state, wherein the end effector includes a plurality of loop-shaped energy members (150a, 150b), each of the plurality of loop-shaped energy members comprising: at least one flexible wire, wherein the at least one flexible wire is resiliently biased to define a bulbous shape of the loop shaped energy member, and a plurality of electrodes (170a, 170b) disposed along the at least one flexible wire wherein each of the plurality of loop-shaped energy members extends along a respective plane, wherein each respective plane is parallel to and laterally offset from the longitudinal axis; wherein the plurality of loop-shaped energy members overlap each other; at least one flexible wire, wherein the at least one flexible wire is resiliently biased to define a bulbous shape of the loop shaped energy member, and a plurality of electrodes (170a, 170b) disposed along the at least one flexible wire wherein each of the plurality of loop-shaped energy members extends along a respective plane, wherein each respective plane is parallel to and laterally offset from the longitudinal axis; wherein the plurality of loop-shaped energy members overlap each other; wherein the energy catheter is selectively translatable relative to the sheath between a proximal retracted position in which the end effector is housed coaxially within the sheath to thereby prevent the end effector from radially expanding from the non-expanded state to the expanded state, and a distal extended position in which the end effector is exposed from the sheath to thereby permit the end effector to expand from the non-expanded state to the expanded state for contacting tissue in the nasal cavity of the patient's head, wherein when the end effector is in the expanded state, the end effector has a width and a length greater than the width.