DEVICE FOR TREATING NASAL AIRWAYS

The system for treating nasal tissue from within a nasal cavity comprises a treatment device (30) comprising a handle (34), a shaft extending from the handle (34), an expandable treatment element (32) at a distal end of the shaft, comprising multiple shape memory material segments and multiple pairs of bipolar electrodes (392) disposed on the multiple shape memory material segments, and a control system (42) coupled with the handle (34) and including an impedance sensor for sensing electrical impedance between the multiple pairs of bipolar electrodes (392). The expandable treatment element (32) is configured to transmit radiofrequency energy from electrodes of the multiple pairs of bipolar electrodes (392), such that the radiofrequency energy passes through the nasal tissue at a selected tissue depth, and the multiple shape memory material segments are configured to expand to a size and a shape for contacting at least some of the multiple pairs of bipolar electrodes (392) with the nasal tissue.