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 device to treat tissue, comprising:
an outer tube;
an inner tube disposed at least partially within the outer tube; and
a dual balloon including an inner balloon and an outer balloon, the inner balloon coupled to the inner tube at a proximal end and at a distal end, the outer balloon coupled to the inner tube at a distal end and to the outer tube at a proximal end, a first interior volume defined between the outer balloon and the inner balloon in fluid communication with an inlet in the volume between the outer tube and the inner tube.
2. The device of claim 1 , wherein the inner tube further defines:
a guidewire lumen;
a supply lumen; and
a return lumen.
3. The device of claim 2 , wherein the supply lumen defines a hole such that a fluid flowing in the supply lumen may be caused to flow into a volume defined by the inner balloon, and wherein the return lumen defines a hole such that a fluid flowing in a volume defined by the inner balloon may be caused to flow into the return lumen.
4. The device of claim 2 , wherein the guidewire lumen extends from a proximal end of the inner tube to a distal end of the inner tube.
5. The device of claim 1 , further comprising at least two radially extending tabs disposed around a circumference of the inner tube to substantially center the inner tube within the dual balloon.
6. The device of claim 1 , further comprising at least one marker band disposed on the inner tube to locate a working region of the device at a desired location.
7. The device of claim 1 , further comprising a source of chilled fluid having a supply tube and a return tube, the supply tube coupled in fluid communication to the supply lumen and the return tube coupled in fluid communication to the return lumen.
8. The device of claim 7 , wherein the fluid is a perfluorocarbon.
9. The device of claim 8 , wherein the fluid is Galden® fluid.
10. The device of claim 9 , wherein the fluid is Galden® fluid HT-55.
11. The device of claim 1 , further comprising a source of fluid, the source of fluid coupled in fluid communication to the volume between the inner balloon and the outer balloon.
12. The device of claim 11 , wherein the fluid includes contrast media.
13. The device of claim 11 , wherein the source of fluid includes a gear pump.
14. The device of claim 13 , wherein the gear pump is one selected from the group consisting of a radial spur gear pump and a helical tooth gear pump.