Devices for treating vascular malformations

Apparatus for treating a vascular malformation, the apparatus comprising:

• an orifice section;
• an occlusion section;
• and
• a connecting section,
• wherein the apparatus is configured such that, when the apparatus is unconstrained:
• the orifice section is shaped so as to define an orifice-section curve that winds at least 2.5 turns around an orifice-section central axis at a changing distance from the orifice-section central axis,
• the occlusion section is shaped so as to define an occlusion-section curve that winds at least 2 turns around an occlusion-section central axis at a changing distance from the occlusion-section central axis,
• the connecting section connects the orifice-section curve with the occlusion-section curve,
• the orifice-section curve defines an orifice-section central opening having an orifice-section-central-opening cross-sectional area equal to at least 2% of an overall-orifice-section cross-sectional area of the orifice-section curve defined by an outermost loop of the orifice-section curve, the orifice-section-central-opening cross-sectional area and the overall-orifice-section cross-sectional area measured perpendicular to the orifice-section central axis,
• the orifice-section central axis and the occlusion-section central axis are not coaxial, and
• a projection of the occlusion-section curve occludes at least 25% of the orifice-section-central-opening cross-sectional area, wherein the projection of the occlusion-section curve is in a direction along the orifice-section central axis, onto an orifice-section plane perpendicular to the orifice-section central axis.