Abstract: Low profile, self-expandable, blood flow restrictors include a hollow channel open at axial ends to allow blood flow through the restrictor installed in a blood vessel. The channel may include a mesh and have a narrowing, or sandglass, profile to reduce blood flow. The sandglass shape is in a central portion of the channel and may be surrounded by a blocking coating impermeable to blood flow or a suture that dissolves over time. The mesh may be formed of a memory alloy. Restrictors include a retrieval connector at an end that is permeable to blood flow and permits attachment for restrictor positioning with a catheter.

Abstract: A low profile, self-expandable, blood flow resisting device comprising: a tubular channel being a hollow channel with open axial ends configured to allow passage of fluids, said tubular channel being a mesh channel, said tubular channel having a sandglass profiled, characterised in that, a pre-defined intermittent portion across axial orientation of said tubular channel being relatively and substantially narrower in width, said tubular channel being made of a shape memory alloy; a retrieval mechanism advantageously located at an operative proximal end of said device.