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.
