Patent ID: 7731722

Claim:
A medical retrieval device, comprising: a control rod; a basket having a periphery and a filter comprising a plurality of wires having wire ends, wherein each wire of the plurality of wires defining the filter is interleaved with another wire of the plurality of wires, and each wire of the plurality of wires defining the filter is twisted together with at least one other wire of the plurality of wires defining the filter within a first portion of the filter and each wire of the plurality of wires separates into a single wire in a second portion of the filter, wherein the wire ends are each jointed together into a wire bundle at one or more points proximal to the periphery, wherein the periphery is defined by a first loop that traverses a portion of the periphery and a second loop that traverses a different portion of the periphery, the first and second loops are linked together at a joint located at a distal end of the basket, and wherein the plurality of wires defining the filter join the periphery at points located between the wire bundle and the joint; wherein the control rod connects to or comprises the wire bundle; and a sheath being moveable with respect to the basket for retracting and extending thereof, wherein the basket asymmetrically projects in one direction from the sheath when the sheath is in a retracted position.