The invention relates to a device providing access to the interior of the heart, comprising at least one access channel, characterised in that it consists of two detachable parts: an outer part (1) comprising a cylindrical element (5) of a smaller diameter, provided inside with the access channel (8) designed to introduce medical devices to the interior of the heart and an outer flange (2) surrounding it externally at one end, located in a plane perpendicular to this element (5), and an inner part (3) comprising a cylindrical element (6) of a larger diameter and an inner flange (4), surrounding it, located in a plane perpendicular to this element (6), parallel to the outer flange (2), on the opposite side relative to this flange (2), wherein the cylindrical element (5) of the outer part (1) is located inside the cylindrical element (6), on one axis therewith, and their interconnection is ensured by a connecting latch (7) located on the plane of adhesion of the cylindrical elements (5, 6).
