Methods and devices to treat nasal airways
Methods and devices for treating nasal airways are provided. Such devices and methods may improve airflow through an internal and/or external nasal valve, and comprise the use of mechanical re-shaping, energy application and other treatments to modify the shape, structure, and/or air flow characteristics of an internal nasal valve, an external nasal valve or other nasal airways.
1. A device for delivering energy to a nasal airway to treat rhinitis, the device comprising:
a handle;
a shaft extending from one end of the handle;
a treatment element coupled with a distal end of the shaft, sized to be inserted into a nostril, and configured to change from a first configuration to a second configuration to contact nasal mucosa lining the nasal airway;
multiple pairs of bipolar radiofrequency electrodes disposed on the treatment element;
multiple radiofrequency output channels connected with the multiple pairs of bipolar radiofrequency electrodes, wherein each pair of the multiple pairs of bipolar radiofrequency electrodes is connected with a respective one of the multiple radiofrequency output channels; and
at least one impedance sensor configured to measure impedance in the multiple pairs of bipolar radiofrequency electrodes.
2. The device of claim 1 , wherein the treatment element comprises multiple segments that are expandable from the first configuration to the second configuration.
3. The device of claim 2 , wherein at least one electrode of the multiple pairs of bipolar radiofrequency electrodes is coupled with each of the multiple segments.
4. The device of claim 2 , wherein the multiple segments are pre-shaped and comprise a shape-memory alloy material configured to expand to a desired size and shape.
5. The device of claim 1 , wherein at least some electrodes of the multiple pairs of bipolar radiofrequency electrodes have a height that is adjustable relative to a tissue treatment surface of the treatment element, and wherein changing the treatment element from the first configuration to the second configuration comprises adjusting the height of at least some of the electrodes of the multiple pairs of bipolar radiofrequency electrodes.
6. The device of claim 5 , wherein the height of the electrodes is adjustable to create a desired treatment surface profile.
7. The device of claim 1 , further comprising:
a radiofrequency generator configured to receive sensed signals from the at least one impedance sensor and deliver radiofrequency energy separately to each of the multiple radiofrequency output channels; and
a cable coupled to the handle for plugging the handle into the radiofrequency generator.
8. The device of claim 7 , wherein the radiofrequency generator is configured to deliver the radiofrequency energy in a form of a 460 kHz sinusoid wave and to run at a power of between 5 and 75 watts.
9. The device of claim 1 , wherein the multiple pairs of bipolar radiofrequency electrodes and the multiple radiofrequency output channels are organized into multiple subsystems, and wherein each of the multiple subsystems comprises one of the multiple pairs of bipolar radiofrequency electrodes and one of the multiple radiofrequency output channels.
10. The device of claim 1 , wherein the multiple pairs of bipolar radiofrequency electrodes are connected to one another and to the multiple radiofrequency output channels in a multiplexed configuration.