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 treating a patient's lung comprising delivering a predetermined volume of a condensable vapor to a targeted region of the patient's lung thereby raising the temperature of tissue in the targeted region sufficiently high to render the targeted region non-functional, the predetermined volume being based on a diagnostic evaluation of the patient's lung function or capacity indicator.
2. The method of claim 1 wherein the condensable vapor is delivered with microparticulates.
3. The method of claim 2 wherein the microparticulates are selected from the group consisting of talc, calcium carbonate, and antibiotics.
4. The method of claim 2 wherein the microparticulates induce fibrosis or necrosis of the lung tissue.
5. The method of claim 1 further comprising monitoring pressure within the targeted region and venting the targeted region if a pressure limit is reached.
6. The method of claim 1 further comprising monitoring temperature within the targeted region and lavaging the targeting region if a temperature limit is reached.
7. The method of claim 1 wherein delivering the predetermined volume of the condensable vapor to the targeted region of the patient's lung comprises inducing neointima hyperplasia in the lung.
8. The method of claim 1 wherein delivering the predetermined volume of the condensable vapor to the targeted region of the patient's lung comprises inducing tissue fibrosis in the lung.
9. The method of claim 1 wherein a vacuum is generated within the targeted region to facilitate collapse of tissue structures thereof.
10. The method of claim 9 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.