Methods for preventing distal embolization from the vertebrobasilar artery using flow reversal
The invention provides a medical device having a catheter and one or more expandable constricting/occluding members. The catheter has a lumen communicating with a port at its distal end. The lumen and port are adapted for introduction of therapeutic or diagnostic devices, including an angioplasty/stent catheter and an atherectomy catheter, into a vertebral or basilar artery. The constrictor/occluder is mounted proximal to the port of the catheter. Manometers may be mounted distal to one or more constrictors for measuring pressure distal to the constrictor(s). Methods of using the devices for preventing distal embolization during vertebral and/or basilar procedures by reversing blood flow in the vertebral artery toward the subclavian artery are disclosed.
1. A method for treating a vertebral artery lesion, the method comprising the steps of:
inserting a distal end of a catheter into a brachiocephalic trunk, the catheter having a proximal end, the distal end of the catheter having a constricting member;
locating the constricting member at a location in the brachiocephalic trunk upstream a vertebral artery having a lesion;
expanding the constricting member at the location to constrict the brachiocephalic trunk, wherein blood flow in the vertebral artery is reversed to pass over the lesion and toward a subclavian artery; and
advancing a therapeutic instrument into the vertebral artery to treat the lesion.
2. The method of claim 1 , wherein the lesion is an occlusion or stenosis.
3. The method of claim 1 , wherein the lesion is a dissection.
4. The method of claim 1 , wherein the catheter is inserted into the brachiocephalic artery in an antegrade direction.
5. The method of claim 1 , wherein the vertebral artery is the right vertebral artery.
6. The method of claim 1 , wherein the occlusion partially occludes the vertebral artery.
7. The method of claim 1 , wherein the occlusion is a stenosis.
8. The method of claim 1 , wherein the occlusion is an embolus.
9. The method of claim 1 , wherein the occlusion is an atheroma.
10. The method of claim 1 , wherein the constricting member is expanded to occlude the brachiocephalic artery.
11. The method of claim 1 , wherein the constricting member is expanded to partially occlude the brachiocephalic artery.
12. The method of claim 1 , wherein the constricting member is a balloon that communicates with an inflation lumen that extends to the proximal end of the catheter.
13. The method of claim 12 , wherein the balloon is a toroidal balloon.
14. The method of claim 1 , wherein the therapeutic instrument is an angioplasty catheter.
15. The method of claim 1 , wherein the therapeutic instrument is a stent.
16. The method of claim 1 , wherein the therapeutic instrument is an atherectomy catheter.
17. The method of claim 1 , wherein the catheter has a lumen adapted to pass the therapeutic instrument.