A system for diverting emboli within a patient can include a device that detects a presence of emboli in a first blood vessel of a patient. A compression member can be aligned, with a second blood vessel of the patient when a collar supporting the compression member is positioned at, least partially around a portion of the patient. In response to, the detection device, a controller can actuate the compression member, when the presence of emboli is detected, from an unactuated state to an actuated state in which at least a portion of the compression member (i) is closer to the second blood vessel than while in the unactuated state and (ii) compresses and limits blood flow through the second blood vessel.