Partial aortic occlusion devices and methods for cerebral perfusion augmentation
Methods are provided for partial aortic obstruction for cerebral perfusion augmentation in patients suffering from global or focal cerebral ischemia. Alternatively, the methods can be used to partially obstruct aortic blood flow to condition the spinal cord to secrete neuroprotective agents prior to abdominal aortic aneurysm repair. Partial obstruction of a vessel can be accomplished by a device comprising an elongate catheter and a distally mounted expandable member. The expandable member may comprise one or two balloons. Other medical devices, such as an angioplasty, stent, or atherectomy catheter, can be inserted distal the expandable member to provide therapeutic intervention.
1. A method for increasing cerebral blood flow, comprising the steps of:
inserting a catheter into a descending aorta, the catheter having a proximal end, a distal end, a first inflatable balloon mounted on the distal end, and a second inflatable balloon mounted on the distal end proximal the first inflatable balloon;
locating the first inflatable balloon upstream from a takeoff of renal arteries;
locating the second inflatable balloon downstream from the takeoff of the renal arteries; and
inflating and maintaining an inflated state of the second inflatable balloon to partially occlude blood flow in the descending aorta during systole and diastole, wherein cerebral blood flow is increased.
2. The method of claim 1 , wherein the second inflatable balloon is adjusted in volume to achieve a desired blood pressure gradient from one side to the other of the second inflatable balloon, while maintaining partial occlusion of the aorta.
3. The method of claim 2 , further comprising the step of inflating and maintaining an inflated state of the first inflatable balloon to partially occlude blood flow in the aorta during systole and diastole.
4. The method of claim 3 , wherein the first balloon is adjusted in volume to achieve a desired blood pressure gradient from one side to the other of said balloon, while maintaining partial occlusion of the aorta.
5. The method of claim 4 , further comprising the step of inflating and maintaining the first and second balloons for at least 30 minutes.
6. The method of claim 5 , further comprising the step of inflating and maintaining the first and second balloons for at least one hour.
7. The method of claim 1 , wherein the second inflatable balloon is inflated to provide 50% or greater occlusion of the cross-sectional area of the descending aorta.
8. The method of claim 7 , wherein the second inflatable balloon is inflated to provide 56% or greater occlusion of the cross-sectional area of the descending aorta.
9. The method of claim 8 , wherein the second inflatable balloon is inflated to provide 64% or greater occlusion of the cross-sectional area of the descending aorta.
10. The method of claim 9 , wherein the second inflatable balloon is inflated to provide 71% or greater occlusion of the cross-sectional area of the descending aorta.
11. The method of claim 10 , wherein the second inflatable balloon is inflated to provide 76% or greater occlusion of the cross-sectional area of the descending aorta.
12. The method of claim 11 , wherein the second inflatable balloon is inflated to provide 83% or greater occlusion of the cross-sectional area of the descending aorta.
13. The method of claim 12 , wherein the second inflatable balloon is inflated to provide 91% or greater occlusion of the cross-sectional area of the descending aorta.
14. The method of claim 1 , further comprising the step of inflating and maintaining an inflated state of the first inflatable balloon to partially occlude blood flow in the aorta during systole and diastole.
15. The method of claim 14 , wherein the first balloon is adjusted in volume to achieve a desired blood pressure gradient from one side to the other of said balloon, while maintaining partial occlusion of the aorta.
16. The method of claim 14 , further comprising the step of inflating and maintaining the first and second balloons for at least 30 minutes.
17. The method of claim 16 , further comprising the step of inflating and maintaining the first and second balloons for at least 1 hour.
18. The method of claim 14 , wherein the first inflatable balloon is inflated to provide 50% or greater occlusion of the cross-sectional area of the descending aorta.
19. The method of claim 18 , wherein the first inflatable balloon is inflated to provide 56% or greater occlusion of the cross-sectional area of the descending aorta.
20. The method of claim 19 , wherein the first inflatable balloon is inflated to provide 64% or greater occlusion of the cross-sectional area of the descending aorta.
21. The method of claim 20 , wherein the first inflatable balloon is inflated to provide 71% or greater occlusion of the cross-sectional area of the descending aorta.
22. The method of claim 21 , wherein the first inflatable balloon is inflated to provide 76% or greater occlusion of the cross-sectional area of the descending aorta.
23. The method of claim 22 , wherein the first inflatable balloon is inflated to provide 83% or greater occlusion of the cross-sectional area of the descending aorta.
24. The method of claim 23 , wherein the first inflatable balloon is inflated to provide 91% or greater occlusion of the cross-sectional area of the descending aorta.