An extravenous valve may include a constricting member configured to surround a body lumen or blood vessel and actuate between a lumen or vessel-occluding configuration and a non-lumen or non-vessel-occluding, configuration, the constricting member including a base material and a shape memory material coupled to the base material, a power source in communication with the constricting member, and a controller configured to receive bio-feedback from a patient. The controller may reversibly actuate the constricting member between the lumen or vessel-occluding configuration and the non-lumen or non-vessel-occluding configuration in response to the bio-feedback. The constricting member may be sized and configured to be delivered to the treatment location through the body lumen or blood vessel.
