Patent ID: 6551327
Filing Date: 2003-04-22
Classification: A61B

Abstract:
An endoscopic stone-extraction device comprising:a support filament comprising a first end portion and a second end portion; a sheath comprising a lumen, the support filament disposed in the lumen such that the sheath is slideable with respect to the support filament; a collapsible stone-extraction basket carried by the first end portion of the support filament and receivable within the lumen of the sheath; a handle comprising a sheath movement element, wherein movement of the sheath movement element in a first direction advances the sheath and causes the basket to at least partially collapse inside the lumen of the sheath, and wherein movement of the sheath movement element in a second direction retracts the sheath and causes the basket to expand to an operational shape outside the lumen of the sheath; the basket, when expanded to the operation shape outside the lumen of the sheath, comprising a stone-entrance region and a stone-retention region, the stone-entrance region comprising a first opening sized to admit a stone into the basket, the stone-retention region comprising a plurality of second openings, all of the second openings being smaller than the first opening; the first opening facing the first end portion of the support filament, the stone-retention region positioned on a side of the basket opposite the first end portion of the support filament; wherein the basket comprises a set of longitudinal basket filaments radiating from the first end portion of the support filament and a set of lateral basket filaments extending between the longitudinal basket filaments, the lateral basket filaments positioned substantially entirely in the stone-retention region of the basket.