Method and device for performing cooling- or cryo-therapies for, e.g., angioplasty with reduced restenosis or pulmonary vein cell necrosis to inhibit atrial fibrillation
View Patent ↗The present invention provides an enhanced method and device to inhibit or reduce the rate of restenosis following angioplasty or stent placement. The invention involves placing a balloon tipped catheter in the area treated or opened through balloon angioplasty immediately following angioplasty. The balloon, which can have a dual balloon structure, may be delivered through a guiding catheter and over a guidewire already in place from a balloon angioplasty. A fluid such as a perfluorocarbon may be flowed into the balloon to freeze the tissue adjacent the balloon, this cooling being associated with reduction of restenosis. The catheter may also be used to reduce atrial fibrillation by inserting and inflating the balloon such that an exterior surface of the balloon is in contact with at least a partial circumference of the portion of the pulmonary vein adjacent the left atrium.
1. A method of reducing atrial fibrillation, comprising:
inserting a catheter at least partially into the heart, the catheter having a dual balloon structure, including an outer balloon and an inner balloon contained within the outer balloon, a portion of the dual balloon structure located in the left atrium and a portion of the dual balloon structure located in a pulmonary vein; and
inflating at least the outer balloon with a perfluorocarbon such that an exterior surface of the outer balloon is in contact with at least a partial circumference of the portion of the pulmonary vein adjacent the left atrium, the perfluorocarbon having a temperature in the range of about −10° C. to −50° C.
2. The method of claim 1 , wherein the dual balloon structure has a working region having a length of between about 5 mm and 10 mm.
3. The method of claim 1 , further comprising:
inserting a wire capable of rupturing the atrial septum from the femoral vein into the right atrium;
funning a hole using the wire in the interatrial septum between the right atrium and the left atrium;
inserting a guide catheter into the right atrium;
inserting a guide wire through the guide catheter into the right atrium and further into a pulmonary vein;
disposing the catheter aver the guidewire into a volume defined by the joint of the right atrium and the pulmonary vein.
4. The method of claim 1 , further comprising inflating the inner balloon with a biocompatible liquid.
5. The method of claim 4 , wherein the biocompatible liquid is static.
6. The method of claim 4 , wherein the biocompatible liquid contains contrast media.
7. The method of claim 5 , wherein the biocompatible liquid in the inner balloon chills biocompatible fluid between the dual balloons.