Methods and apparatus for treatment of obesity with an ultrasound device movable in two or three axes
Method and apparatus for treating obesity by an energy delivery device, such as a high focus ultrasound transducer, mounted for movement along two or three axes relative to the esophagus to deliver transesophageal energy to interrupt the function of vagal nerves. Preferably, movement along a longitudinal axis of the esophagus changes the site to which the energy is directed and movement transversely along a radius of the esophagus focuses the energy on a vagal nerve. The third degree of freedom relative to the esophagus is to rotate the transducer about the longitudinal axis of the esophagus.
1. A device for ablating a vagal nerve to disrupt a function of the vagal nerve to reduce obesity comprising:
an energy delivery device;
a platform adapted to carry the energy delivery device, the platform being adapted to position the energy delivery device along a first axis and a second axis, the first axis being a longitudinal axis of the esophagus and the second axis being a radius of the esophagus, wherein the platform adjusts the position of the energy delivery device along the first axis to control the focus of the energy being delivered to the location of the vagal nerve branch;
a position actuator coupled to the platform, the position actuator moving the platform to adjust the position of the energy delivery device along the first axis, wherein the platform and the position actuator interact through at least one guide rail, and
an actuator for energizing the energy delivery device such that energy is delivered to a vagal nerve branch at a level sufficient to ablate the vagal nerve branch.
2. The device of claim 1 wherein the platform moves the energy delivery device along the first axis closer to the vagal nerve branch.
3. The device of claim 1 wherein the platform moves the energy delivery device along the first axis further from the vagal nerve branch.
4. The device of claim 1 wherein the platform is adapted to position the energy delivery device along the second axis to change a location relative to the stomach to which the energy is being delivered.
5. The device of claim 4 wherein the platform moves the energy delivery device along the second axis distally to change the location to another location closer to the stomach.
6. The device of claim 4 wherein the platform moves the energy delivery device along the second axis proximally to change the location to another location farther from the stomach.
7. The device of claim 1 further comprising a slot corresponding to the guide rail.
8. The device of claim 7 further comprising a treatment window adapted to pass the energy to the vagal nerve branch.
9. The device of claim 8 further comprising a stop to set a minimum distance between the platform and the treatment window.
10. The device of claim 1 wherein the guide rail is inclined.
11. The device of claim 1 further comprising a forward stop on the position actuator that limits the forward progress of the position actuator.
12. The device of claim 1 further comprising a diagnostic imaging transducer on the platform.
13. The device of claim 1 further comprising a channel in the platform adapted to circulate a fluid adjacent the energy delivery device.
14. The device of claim 1 further comprising a nerve mapping device.
15. The device of claim 14 wherein the nerve mapping device is a constant current impedance grid.
16. The device of claim 1 wherein the platform is adapted to rotate the energy delivery device about the second axis of the esophagus.
17. The device of claim 1 wherein the energy delivery device is an ultrasound transducer.
18. The device of claim 17 wherein the transducer is a high intensity ultrasound transducer.
19. The device of claim 17 wherein the transducer is a high intensity focused ultrasound transducer.
20. The device of claim 1 wherein the energy delivery device is a radio frequency electrode.
21. The device of claim 1 further comprising a positioning member.
22. The device of claim 21 wherein the positioning member is a balloon.
23. The device of claim 21 wherein the positioning member is a vacuum device.
24. A device for disrupting a function of a vagal nerve comprising:
an energy delivery device;
a platform adapted to carry the energy delivery device, the platform being adapted to position the energy delivery device along a first axis and a second axis, the first axis being a longitudinal axis of the esophagus and the second axis being a radius of the esophagus, wherein the platform adjusts the position of the energy delivery device along the first axis to control the focus of the energy being delivered to the location of the vagal nerve branch;
a position actuator coupled to the platform, the position actuator moving the platform to adjust the position of the energy delivery device along the first axis; and
an actuator for energizing the energy delivery device such that energy is delivered to a vagal nerve branch, wherein the platform and the position actuator interact through at least one guide rail.
25. The device of claim 24 further comprising a slot corresponding to the guide rail.
26. The device of claim 25 further comprising a treatment window adapted to pass the energy to the vagal nerve branch.
27. The device of claim 26 further comprising a stop to set a minimum distance between the platform and the treatment window.
28. The device of claim 24 wherein the guide rail is inclined.