Patent ID: 8469970

Claim:
A retrieval apparatus for entrapping and retaining an object located in a body for its extraction therefrom, the apparatus comprising a retrieval snare formed by a plurality of filaments defining proximal and distal sections interconnected to each other; the snare being changeable between its deployed state and contracted state; wherein the filaments extend from a proximal end of the proximal section towards the distal section, and then return to the proximal end to form a plurality of loops, the loops are interlaced with each other only within the proximal section, while being free within the distal section in the deployed state, distal ends of the loops approach each other when the snare is in the contracted state; wherein the filament loops are flat and planar along at least a portion of their length; and wherein sides of at least a part of the filament loops are bent within the distal section and arcuate into arcs at a distal end of the distal section such that said retrieval snare in the contracted state forms a hollow cavity at least at the distal section, wherein the filaments forming sides of the loops are bent three times to define four straight wire segments angled with respect to each other at a sequence of three angles having predetermined values.