Extraction device

摘要

Extraction devices adapted to grasp, hold and move a variety of biological materials. The extraction devices include a sheath with an interior passage and legs slidably received within the passage of the sheath. The legs are adapted to move outwardly away from each other when deployed from the sheath to establish a deployed position, and to move inwardly toward each other to collapse within the sheath and define a stowed position. Each leg has a transverse cross-sectional shape defined by a first surface that is concave and an oppositely-disposed second surface that is convex. The legs have adjacent distal ends that define a grasping and holding feature when the legs are moved between their deployed and stowed positions. Each distal end has an arcuate portion and defines a distal surface that is substantially parallel to the longitudinal axis of the corresponding leg thereof when the legs are in the stowed position. The concave inward surface of each leg and its distal surface cooperate to define at least two points adapted for grasping when the legs are retracted into the sheath.

主权项

1. An extraction device having a sheath with an interior passage and legs slidably received within the passage of the sheath, the legs being adapted to move outwardly away from each other when deployed from the sheath to establish a deployed position, and to move inwardly toward each other to collapse within the sheath and define a stowed position, each of the legs having a centerline, a distal portion encompassing a longitudinal portion of the centerline, a distal end encompassing a second portion of the centerline and having an arcuate portion that extends from the distal portion along an arc of greater than 90 degrees to a distal surface thereof that is intersected by the second portion of the centerline, and a concave-convex cross-sectional shape transverse to the centerline and defined by and between a first surface that is concave and present on the distal portion and the distal end and an oppositely-disposed second surface that is convex and present on the distal portion and the distal end, the legs being oriented by the passage of the sheath such that the first surfaces thereof face each other, each of the distal surfaces being oriented transverse to and between the first and second surfaces of the distal end thereof and at an oblique angle to the second portion of the centerline of the distal end thereof where the second portion of the centerline intersects the distal surface such that the distal surfaces of the legs face each other, the distal surface of each of the distal ends defining a grasping and holding feature with the first surface of the corresponding leg, each grasping and holding feature comprising at least two extremities that define at least first and second points that project farther toward the sheath than any other region of the distal surface and are adapted for grasping when the legs are retracted into the sheath, the first point being defined by a first intersection of the first, second, and distal surfaces of the corresponding leg, the second point being defined by a second intersection of the first, second, and distal surfaces of the corresponding leg.