Ureteral backstop filter and retrieval device

A ureteral backstop filter device, comprising:

• a control rod comprising an attaching portion and a control portion;
• a basket having an atraumatic periphery defining an opening into the basket significantly larger than any other openings into the basket and a filter, the basket comprising a plurality of wires having wire ends, wherein each wire of the plurality of wires is interleaved with at least one other 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 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 each wire of the plurality of wires defining the filter is interleaved with another wire of the plurality of wires in the 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 remaining portion of the periphery not traversed by the first loop, the first and second loops are linked together, and each of the wires defining the plurality of wires join the periphery remotely from the wire bundle and the joint;
• wherein the wire bundle is attached to the control rod, wherein the periphery further comprises a flex point defined by the link between first and second loops;
• a sheath being moveable with respect to the basket for retracting and extending thereof, wherein the sheath contains the basket, wherein when the sheath is retracted or the basket is extended, the basket projects perpendicularly from the sheath.

A retrieval device, comprising:

• a control rod;
• a basket having an atraumatic periphery defining an opening into the basket significantly larger than any other opening into the basket and a filter comprising a plurality of superelastic 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 is twisted together with at least one other wire of the plurality of wires 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 plurality of wires define a tipless filter;
• wherein the periphery is defined by a first twisted loop that traverses a portion of the periphery and a second twisted loop that traverses a remaining portion of the periphery not traversed by the first loop, the first and second of the plurality of loops are linked together at a joint, and a portion of each wire of the plurality of wires joins the periphery remotely from the wire bundle and the joint;
• a filiform formed from at least a portion of the superelastic wire loops;
• a sheath being moveable with respect to the basket for retracting and extending thereof, wherein when the sheath is retracted or the loops are extended, the basket projects perpendicularly from the sheath, the loops being in a relaxed condition when outside the sheath.

A retrieval device, comprising:

• a control rod;
• a basket having an atraumatic periphery defining an opening in the basket significantly larger than other openings and a filter, the basket comprising a plurality of wires and first and second loops jointed together at a single point and attached to the control rod, at least a part of each of the plurality of wires being interleaved with each other and joining the atraumatic periphery of the basket, 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 separate into a single wire in a second portion of the filter, wherein the periphery is defined by a first twisted loop that traverses a portion of the periphery and a second twisted loop that traverses a remaining portion of the periphery not traversed by the first loop, the first and second loops are linked together to define a flex point located at a distal end of the periphery;
• 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.

A medical retrieval device, comprising:

• a control rod;
• a basket having a periphery defining an opening in the basket significantly larger than other openings and a filter comprising a plurality of wires jointed together at their wire ends to form a wire bundle at the periphery, the wire bundle being routed to the control rod for joining thereto at a distal end of the control rod, and at least a part of each wire of the plurality of wires is interleaved with other wires 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 separate into a single wire in a second portion of the filter, wherein the periphery is defined by a first twisted loop that traverses a portion of the periphery and a second twisted loop that traverses a remaining portion of the periphery not traversed by the first loop, the first and second loops are linked together to define a flex point, and each wire of the plurality of wires joins the periphery remotely from 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.