Devices, systems, and methods to treat heart failure having an improved flow-control mechanism
Several unique intra-cardiac pressure vents, placement catheters, methods of placement and methods of treating heart failure are presented. The intra-cardiac pressure vents presented remain partially open under normal intra-cardiac pressures to allow sufficient flow from the left atrium to the right atrium to enable the relief of elevated left atrial pressure and resulting patient symptoms, and also limit the amount of flow from the right atrium to the left atrium by closing when the pressure in the right atrium exceeds the pressure in the left atrium by a predetermined amount.
1. A device for treating a heart condition in a patient, said device being configured to be implanted into the atrial septum of the patient's heart, the patient's heart comprising a left atrium and a right atrium, the device comprising:
a cylindrical core segment defining a passage;
a first annular flange adapted to engage a first surface of the atrial septum;
a second annular flange adapted to engage a second surface of the atrial septum, the
second surface opposite to the first surface, and
a flow control element adapted to be partially open when the pressure in the left atrium is equal to the pressure in the right atrium and to close when the pressure in the right atrium is greater than the pressure in the left atrium by at least 2 mm Hg,
wherein the flow control element extends over a radially inner portion of the second annular flange, such that it overlaps with the radially inner portion of the second annular flange.
2. The device of claim 1 wherein the flow control element comprises a valve.
3. The device of claim 1 wherein the first surface of the atrial septum is in the right atrium.
4. The device of claim 1 wherein the second surface of the atrial septum is in the left atrium.
5. The device of claim 2 wherein the valve is further adapted to be flappable during the cycle of the heart.
6. The device of claim 2 wherein the valve is further adapted to resonate with the cycle of the heart.