Prosthetic heart valve for natural blood flow

An implant for implanting in a heart chamber on a side of a heart, the implant comprising:

• an outer section including a curved portion configured to be positioned in the heart chamber, wherein the implant is sized such that an ellipsoid conforming to the curved portion has:
• an ellipsoid height that is greater than a length of the heart chamber by a percentage that is within a predetermined range of height percentage values;
• and
• an ellipsoid width that is greater than a width of the heart chamber by a percentage that is within a predetermined range of width percentage values;
• and
• an inner valve support positioned inside the implant;
• wherein:
• the length and width of the heart chamber are defined in an image of the heart chamber;
• the length extends between:
• a level that approximates an upper annular surface at a bottom of the heart chamber;
• and
• a point that is:
• on a roof of the heart chamber;
• and
• within 1.5 mm of a highest point on the roof in the image;
• the heart chamber is an atrium;
• the side of the heart includes a ventricle;
• when the implant is deployed in the atrium, the inner valve support is configured to provide blood flow impingement on a posterior side of the ventricle during atrial contraction;
• and
• dimensions of the inner valve support are preselected and not determined based on metrics derived from the image.