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Abstract

An improved medical retriever device sized and adapted for use through the working channel of an endoscope for removing stones and the like from the kidneys, ureter or biliary duct. The device is of the type having an elongated, narrow sheath, a basket of relatively large diameter extendible from the distal end of the sheath and collapsible when withdrawn into the sheath, and remote means to project, retract and rotate the basket relative to the distal end of the sheath. The basket is defined by a multiplicity of spaced apart, outwardly bowed spring strips which extend generally axially of the sheath and are joined at respective distal and proximal ends of the basket. The strips are generally flat, with a ratio of radial to circumferential dimensions of between about 1:2 and 1:4, at least two of the strips at the distal extremity of the basket being disposed face to face and joined together in a manner contributing stiffness to the end of the basket. The basket shown has a generally bulbous form at its distal end, which is relatively stiff due to the spring strip construction and facilitates the dislodgement and capture of stones.

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First Claim