Devices and methods for treatment of luminal tissue
Devices and methods are provided for treatment of tissue in a body lumen with an electrode deployment device. Embodiments typically include a device with a plurality of electrodes having a pre-selected electrode density arranged on the surface of a support. The support may comprise a non-distensible electrode backing that is spirally furled about an axis and coupled to an expansion member such as an inflatable elastic balloon. In some embodiments, the balloon is inflated to selectively expose a portion of the electrode surface while maintaining the electrode density.
1. An electrode deployment apparatus for treatment of tissue in a body lumen, the apparatus comprising:
a dimensionally-stable support having a first end, a second end, and a surface;
a plurality of electrodes arranged on the surface of the support; and
an expansion member configured to transition between an unexpanded configuration and an expanded configuration, wherein the expansion member is coupled with the support and the support is partially wrapped around the expansion member such that a gap exists between the first end and the second end to provide a partial circumferential portion of the expansion member covered by the support as the expansion member transitions to the expanded configuration.
2. The electrode deployment apparatus of claim 1 , wherein the expansion member is coupled with the support at one or more attachment sites of the support.
3. The electrode deployment apparatus of claim 2 , wherein the one or more attachment sites are located near at least the first end or the second end of the support.
4. The electrode deployment apparatus of claim 2 , wherein at least one of the one or more attachment sites is located circumferentially midway between the first end and the second end of the support.
5. The electrode deployment apparatus of claim 1 , wherein the support comprises a portion that is furled in on itself.
6. The electrode deployment apparatus of claim 5 , wherein the furled in portion of the support decreases in length as the expansion member expands.
7. The electrode deployment apparatus of claim 5 , wherein the furled in portion of the support increases in length as the expansion member contracts.
8. The electrode deployment apparatus of claim 5 , further comprising:
a container configured to house the furled in portion of the support.
9. The electrode deployment apparatus of claim 8 , wherein the container is cylindrically shaped.
10. The electrode deployment apparatus of claim 8 , wherein the container comprises a portion that does not overlap in a outwardly radial direction with the expansion member.
11. The electrode deployment apparatus of claim 5 , further comprising:
a shaft attached to the support that is configured to rotate freely as the expansion member expands.
12. The electrode deployment apparatus of claim 5 , wherein the furled in portion of the support is furled in a spiral configuration.
13. The electrode deployment apparatus of claim 5 , wherein the furled in portion of the support is folded upon itself in an accordion-like pattern.
14. The electrode deployment apparatus of claim 1 , wherein the expansion member comprises a balloon.
15. The electrode deployment apparatus of claim 1 , wherein the expansion member comprises at least one of a compliant balloon, a balloon with a tapered geometry, a basket, a plurality of struts, a foam, a bladder, or a backing material configured to expand to the expanded configuration when unrestrained.
16. The electrode deployment apparatus of claim 1 , wherein the support is partially wrapped around the expansion member to provide the partial circumferential portion of the expansion member covered by the support such that the support is furled around the support.