A trileaflet mechanical prosthetic heart valve comprising: a ring including three or more protrusions located along an inner circumference of the ring; three or more hinges attached to the ring, the three or more hinges evenly spaced from one another along the inner circumference of the ring; and three or more leaflets, each leaflet having a generally triangular shape, each leaflet attached to one of the three or more hinges, each leaflet attached to a hinge by an opening located in the center of a lower portion of the leaflet, each leaflet including: a front surface having a substantially concave shape in a transverse axis and a substantially flat shape in a longitudinal axis, characterized by each leaflet including: flat regions on a left side and a right side of the front surface of the leaflets; and a rear surface having a convex shape in the transverse axis and a flat shape in the longitudinal axis, the rear surface of the leaflets configured to be in contact with the protrusions of the ring when the leaflets are in an open position, and configured such that the rear surface of the leaflets substantially tracks an inner contour of the ring of the heart valve to form a gap between the rear surface of the leaflets and the inner circumference of the ring when the leaflets are in the open position and so that the curvature of the rear surface of the leaflets closely matches the curvature of the ring when the leaflets are in the open position, such that the rear surface of the leaflet is equidistant from the inner circumference of the ring along a radius of the ring when the leaflet is in the open position. a ring including three or more protrusions located along an inner circumference of the ring; three or more hinges attached to the ring, the three or more hinges evenly spaced from one another along the inner circumference of the ring; and three or more leaflets, each leaflet having a generally triangular shape, each leaflet attached to one of the three or more hinges, each leaflet attached to a hinge by an opening located in the center of a lower portion of the leaflet, each leaflet including: a front surface having a substantially concave shape in a transverse axis and a substantially flat shape in a longitudinal axis, characterized by each leaflet including: flat regions on a left side and a right side of the front surface of the leaflets; and a rear surface having a convex shape in the transverse axis and a flat shape in the longitudinal axis, the rear surface of the leaflets configured to be in contact with the protrusions of the ring when the leaflets are in an open position, and configured such that the rear surface of the leaflets substantially tracks an inner contour of the ring of the heart valve to form a gap between the rear surface of the leaflets and the inner circumference of the ring when the leaflets are in the open position and so that the curvature of the rear surface of the leaflets closely matches the curvature of the ring when the leaflets are in the open position, such that the rear surface of the leaflet is equidistant from the inner circumference of the ring along a radius of the ring when the leaflet is in the open position. a front surface having a substantially concave shape in a transverse axis and a substantially flat shape in a longitudinal axis, characterized by each leaflet including: flat regions on a left side and a right side of the front surface of the leaflets; and a rear surface having a convex shape in the transverse axis and a flat shape in the longitudinal axis, the rear surface of the leaflets configured to be in contact with the protrusions of the ring when the leaflets are in an open position, and configured such that the rear surface of the leaflets substantially tracks an inner contour of the ring of the heart valve to form a gap between the rear surface of the leaflets and the inner circumference of the ring when the leaflets are in the open position and so that the curvature of the rear surface of the leaflets closely matches the curvature of the ring when the leaflets are in the open position, such that the rear surface of the leaflet is equidistant from the inner circumference of the ring along a radius of the ring when the leaflet is in the open position. flat regions on a left side and a right side of the front surface of the leaflets; and a rear surface having a convex shape in the transverse axis and a flat shape in the longitudinal axis, the rear surface of the leaflets configured to be in contact with the protrusions of the ring when the leaflets are in an open position, and configured such that the rear surface of the leaflets substantially tracks an inner contour of the ring of the heart valve to form a gap between the rear surface of the leaflets and the inner circumference of the ring when the leaflets are in the open position and so that the curvature of the rear surface of the leaflets closely matches the curvature of the ring when the leaflets are in the open position, such that the rear surface of the leaflet is equidistant from the inner circumference of the ring along a radius of the ring when the leaflet is in the open position.