device and method for preventing embolization during a surgical procedure include a dome shaped deflector a catheter coupled to the deflector and a delivery sheath the deflector includes a frame and porous cover the cover permitting blood flow therethrough while blocking emboli the deflection device is deployable from a branch vessel to cover an ostium of the branch vessel to block emboli from a main vessel from entering the branch vessel application_number US 201313911692 A description the deflector u201c umbrella u201d of the present invention is positioned prior to any manipulation of the heart or thoracic aorta it is simple to place and carries only the risk of catheterizing the aorta through the arm or leg which is minimal the umbrella is opened in the thoracic aorta and positioned to cover the ostia of both the brachiocephalic and left common carotid arteries this position prevents clots or debris from entering the cerebral circulation through either the right or left carotid arteries with one simple device any debris from the cardiac or aortic procedure is deflected downstream after the procedure is complete the umbrella is inverted by means of a sheath extended over the catheter wire which then wholly or partially covers the inverted umbrella prior to withdrawal should any clot or debris be attached to the outer side of the umbrella it will be captured in the inverted umbrella and withdrawn a major advantage of the device is that one size fits all so it can be kept available in stock the umbrella is preferably dome shaped with an adequate diameter to cover the ostia of both the brachiocephalic and left common carotid arteries made of a material with pores or similar openings or permeability to allow the flow.