System and device for engulfing thrombi

A stent retriever for removing a thrombus from a blood vessel, the stent retriever comprising:

• a body portion formed by a mesh sheet formed into a substantially cylindrical shape;
• wherein the mesh sheet comprises a pair of undulating wire members coupled to a connecting member, each of the pair of wire members comprising a plurality of protrusions and a plurality of recesses defined between the plurality of protrusions;
• wherein the plurality of protrusions on a first side of the mesh sheet are offset from the plurality of protrusions on a second side of the mesh sheet such that when the mesh sheet is formed into the substantially cylindrical shape by bringing the first and second side of the mesh sheet together, the wire members are disposed in an interlocking arrangement such that the plurality of recesses on the first side of the mesh sheet receive at least portions of the plurality of protrusions on the second side of the mesh sheet;
• and
• wherein at least one of the plurality of protrusions includes at least one subprotrusion formed in the wire member to increase the mesh density of the stent retriever.