Device and method for lung treatment
This invention relates to the treatment of a patient's lung, for example, a lung exhibiting chronic obstructive pulmonary disease (COPD) and in particular to methods and devices for affecting lung volume reduction, preferably for achieving acute or immediate lung volume reduction following treatment. The lung volume reduction is effected by delivering a condensable vapor at a temperature above body temperature to the desired regions of the patient's lung to damage tissue therein. Blood flow and air flow to the damaged tissue region is essentially terminated, rendering the target region non-functional. Alternative energy sources may be used to effect the thermal damage to the lung tissue.
1. A method of monitoring a lung treatment comprising the step of:
delivering a condensable vapor to a targeted region of the patient's lung to cause necrosis in tissue in the targeted region; and
detecting movement of the condensable vapor delivered to the targeted region of the lung to track progress of treatment and which lung regions have been treated; and
in conjunction with the detecting step, monitoring the condensable vapor and tissue effects of the targeted region during treatment using a visualization technique.
2. The method of claim 1 wherein the condensable vapor comprises a biocompatible dye.
3. The method of claim 2 wherein the detecting comprises visually observing the dye moving in the targeted region.
4. The method of claim 1 wherein the visualization technique is diagnostic ultrasound.
5. A method of monitoring a lung treatment comprising:
delivering a condensable vapor to a targeted region of the patient's lung for 5 to 10 seconds to a temperature adapted to raise the temperature of tissue in the targeted region to render it non-functional; and
detecting tissue effects arising from the delivering step.
6. The method of claim 5 further comprising monitoring pressure within the targeted region and venting the targeted region if a pressure limit is reached.
7. The method of claim 5 further comprising monitoring temperature within the targeted region and lavaging the targeting region if a temperature limit is reached.
8. The method of claim 5 wherein delivering the condensable vapor to the targeted region of the patient's lung comprises inducing neointima hyperplasia in the lung.
9. The method of claim 5 wherein delivering the condensable vapor to the targeted region of the patient's lung comprises inducing tissue injury and necrosis leading to fibrosis in the lung.
10. The method of claim 5 wherein a vacuum is generated within the targeted region to facilitate collapse of tissue structures thereof.
11. The method of claim 10 wherein the tissue structures collapsed are at least one of the group consisting of an air sac of the patient's targeted region, terminal bronchioles in the targeted region and collateral passageways in the targeted region.
12. The method of claim 5 wherein the detecting is based on monitoring the tissue effects via a visually detectable substance, diagnostic ultrasound, or an endoscope.
13. The method of claim 5 wherein the predetermined amount of condensable vapor comprises a biocompatible dye.
14. The method of claim 13 wherein the detecting comprises visually observing the dye moving in the targeted region.