Arteriotomy closure apparatus with slotted shoe for advantageous pressure distribution

A device for sealing an aperture in a tissue of a body lumen comprising:

• a closure device comprising:
• (i) a flexible support member comprising a base and a column disposed in the center of the base, the column comprising a centering tab and/or one or more locking tabs;
• (ii) a sealable member comprising a thin, flexible sheet, a hole in the center of the flexible sheet, wherein the flexible sheet is disposed over the base, and wherein the column passes through the hole;
• (iii) an extra-arterial shoe comprising one or more engagement elements for engagement with an exterior of the column to secure the closure device;
• and
• (iv) a guard member comprising an elongate body, a locking feature, a wedge feature, and a guidewire lumen, wherein the elongate body of the guard member is inserted through a first aperture of the extra-arterial shoe;
• and
• a delivery system comprising a delivery shaft,
• wherein the extra-arterial shoe comprises a hollow cylindrical shape and a centerline configured to be collinear with a centerline of the column of the support member when the extra-arterial shoe is engaged on the column,
• wherein the longitudinal axis of the column forms an angle between 10 degrees and 70 degrees with a lateral plane of the base,
• wherein the column is angled over a proximal end of the base, and
• wherein the one or more engagement elements of the extra-arterial shoe comprises at least one of a notch, a hole, and a groove.