Prosthetic valves and oval stents for flow balancing

An implantable device for modulating blood flow through a blood vessel, the device comprising:

• a stent frame positionable within the blood vessel, the stent frame having a substantially oval cross-sectional shape;
• a valve defining an inflow end and an outflow end defining an aperture, the valve comprising at least one leaflet at the outflow end, the at least one leaflet being positionable to overlay at least a portion of the aperture and configured to move in a radial direction that is perpendicular to a central axis of the stent frame;
• a first elastomeric member having a first opening and a second opening and defining a first lumen, the first opening being coupled to a portion of the stent frame, the second opening being coupled to a portion of the inflow end of the valve;
• and
• a second elastomeric member having a third opening and a fourth opening and defining a second lumen, the third opening being coupled to a portion of the stent frame, the fourth opening being coupled to a portion of the inflow end of the valve,
• wherein the valve is configured to cause the at least one leaflet to move in the radial direction to reduce a cross-sectional area of the aperture and restrict flow through the valve in response to elevated pressure within the blood vessel.

An implantable device for modulating blood flow through a blood vessel, the implantable device comprising:

• a stent frame positionable within the blood vessel, the stent frame having a substantially oval cross-sectional shape;
• a valve defining an inflow end and an outflow end, the inflow end being coupled to the stent frame and the outflow end defining an aperture, the valve comprising at least one leaflet at the outflow end, the at least one leaflet being positionable to selectively cover at least a portion of the aperture;
• and
• at least one control element coupled to the valve,
• wherein the at least one control element is configured to move the at least one leaflet between a first position and a second position to manipulate the valve between a substantially unrestricted blood flow position and a restricted blood flow position,
• wherein the at least one leaflet at least partially obstructs the aperture in the first position and wherein the aperture is substantially unobstructed in the second position.