An excisional device, comprising: a distal sheath defining a longitudinal axis; a work element configured to at least partially fit within the distal sheath, the work element comprising first and second beak actuating elements and first and second articulable beaks (452, 454) configured to rotate within the distal sheath about the longitudinal axis, the first and second articulable beaks defining respective first and second curved distal surfaces configured to cut tissue, a portion of both of the first and second curved surfaces being configured to rotate outside of the distal sheath; the first articulable beak comprising: a first wedge-shaped cutout; a second wedge-shaped cutout that faces the first wedge-shaped cutout; a first living hinge formed by slots between the first wedge-shaped cutout and the second wedge-shaped cutout; and first and second tendons (468, 470) that are separate and distinct from the first living hinge and that are coupled to each side of the first beak respectively and to the first beak actuating element; the second articulable beak comprising: a third wedge-shaped cutout, a fourth wedge-shaped cutout that faces the third wedge-shaped cutout; a second living hinge formed by slots between the third wedge-shaped cutout and the fourth wedge-shaped cutout, and third and fourth tendons (468, 470) that are separate and distinct from the second living hinge and that are coupled to each side of the second beak respectively and to the second beak actuating element, wherein proximally-directed movement of the first and second beak actuating elements acts on the first to fourth tendons, flexes the first and second living hinges and causes the first and second articulable beaks to move from an open configuration to a closed configuration. a distal sheath defining a longitudinal axis; a work element configured to at least partially fit within the distal sheath, the work element comprising first and second beak actuating elements and first and second articulable beaks (452, 454) configured to rotate within the distal sheath about the longitudinal axis, the first and second articulable beaks defining respective first and second curved distal surfaces configured to cut tissue, a portion of both of the first and second curved surfaces being configured to rotate outside of the distal sheath; the first articulable beak comprising: a first wedge-shaped cutout; a second wedge-shaped cutout that faces the first wedge-shaped cutout; a first living hinge formed by slots between the first wedge-shaped cutout and the second wedge-shaped cutout; and first and second tendons (468, 470) that are separate and distinct from the first living hinge and that are coupled to each side of the first beak respectively and to the first beak actuating element; a first wedge-shaped cutout; a second wedge-shaped cutout that faces the first wedge-shaped cutout; a first living hinge formed by slots between the first wedge-shaped cutout and the second wedge-shaped cutout; and first and second tendons (468, 470) that are separate and distinct from the first living hinge and that are coupled to each side of the first beak respectively and to the first beak actuating element; the second articulable beak comprising: a third wedge-shaped cutout, a fourth wedge-shaped cutout that faces the third wedge-shaped cutout; a second living hinge formed by slots between the third wedge-shaped cutout and the fourth wedge-shaped cutout, and third and fourth tendons (468, 470) that are separate and distinct from the second living hinge and that are coupled to each side of the second beak respectively and to the second beak actuating element, wherein proximally-directed movement of the first and second beak actuating elements acts on the first to fourth tendons, flexes the first and second living hinges and causes the first and second articulable beaks to move from an open configuration to a closed configuration. a third wedge-shaped cutout, a fourth wedge-shaped cutout that faces the third wedge-shaped cutout; a second living hinge formed by slots between the third wedge-shaped cutout and the fourth wedge-shaped cutout, and third and fourth tendons (468, 470) that are separate and distinct from the second living hinge and that are coupled to each side of the second beak respectively and to the second beak actuating element, wherein proximally-directed movement of the first and second beak actuating elements acts on the first to fourth tendons, flexes the first and second living hinges and causes the first and second articulable beaks to move from an open configuration to a closed configuration.