The present teachings provide a device and methods of making and use thereof. Specifically, one aspect of the present teachings provides a device for restricting blood flow entering the lung after each right bean systole. Certain embodiments of the present teachings provide a device that prevents a complete closure of the pulmonary valve leaflets so that a certain amount of blood is allowed to flow from the pulmonary artery to the right ventricle at the end of a right ventricle systole. Other embodiments of the present teachings provide a device that restricts the amount of blood outflowing from the right ventricle to the pulmonary artery. In addition, the present teachings also provide a delivery system for implanting such a device approximately to or at the pulmonary valve.
