High pressure and high temperature vapor catheters and systems
View Patent ↗Devices and systems are described for treating intraluminal locations such as in a patient's lung. The device has an elongated shaft with an inner lumen, preferably defined by an inner tubular member, formed of heat resistant polymeric materials such as polyimide. The device also has an outer surface formed of heat resistant material. High temperature vapor is directed through the inner lumen into the intraluminal location to treat tissue at and distal to the location. An enlarged or enlargeable member, such as a balloon, is provided on a distal portion of the shaft to prevent proximal flow of the high temperature vapor upon discharge from the device.
1. A method of reducing lung volume of a lung of a patient comprising:
generating water vapor at a pressure of between 5-100 psig in a vapor generator external to the patient;
inserting a delivery catheter through a working channel of a bronchoscope into a lumen of the lung;
delivering the water vapor through the catheter into the lung; and
heating tissue within the lung lumen to reduce lung volume.
2. The method of claim 1 wherein the delivering step comprises delivering water vapor through a catheter exit port, the method further comprising inflating an occlusion balloon in the lumen proximal to the exit port.
3. The method of claim 1 wherein the delivering step comprises delivering water vapor to the lung for 1-20 seconds, then ceasing the delivery step.
4. The method of claim 1 wherein the delivering step comprises delivering the water vapor through the catheter into the lung at an energy delivery rate of 5-1500 cal/sec.
5. The method of claim 1 further comprising, prior to the delivering step, passing water vapor through a vapor supply line and passing water vapor from the vapor supply line through a priming line and into a collection unit, the delivering step comprising passing water vapor from the vapor supply line into the catheter.
6. A method of reducing lung volume of a lung of a patient comprising:
generating water vapor in a vapor generator external to the patient;
inserting a delivery catheter into a lumen of the lung;
delivering the water vapor through the catheter into the lung at an energy delivery rate of 5-1500 cal/sec; and
heating tissue within the lung lumen to reduce lung volume.
7. The method of claim 6 wherein the delivering step comprises delivering water vapor to the lung for 1-20 seconds, then ceasing the delivery step.
8. The method of claim 6 wherein the inserting step comprises inserting the catheter through a working channel of a bronchoscope.
9. The method of claim 6 wherein the delivering step comprises delivering water vapor through a catheter exit port, the method further comprising inflating an occlusion balloon in the lumen proximal to the exit port.
10. The method of claim 6 further comprising, prior to the delivering step, passing water vapor through a vapor supply line and passing water vapor from the vapor supply line through a priming line and into a collection unit, the delivering step comprising passing water vapor from the vapor supply line into the catheter.
11. A method of reducing lung volume of a lung of a patient comprising:
generating water vapor in a vapor generator external to the patient;
passing water vapor through a vapor supply line;
passing water vapor from the vapor supply line through a priming line and into a collection unit;
after passing water vapor through the priming line, passing water vapor through a delivery catheter into a lumen of the lung; and
heating tissue within the lung lumen to reduce lung volume.
12. The method of claim 11 wherein the delivering step comprises delivering water vapor to the lung for 1-20 seconds, then ceasing the delivery step.
13. The method of claim 11 wherein the inserting step comprises inserting the catheter through a working channel of a bronchoscope.
14. The method of claim 11 wherein the delivering step comprises delivering water vapor through a catheter exit port, the method further comprising inflating an occlusion balloon in the lumen proximal to the exit port.