An ultrasonic surgical device (10, 110) comprising: (a) an elongate waveguide having a longitudinal axis and a distal end; and (b) a blade (24, 124, 224) extending away from the distal end of the waveguide, said blade having: - a length, - a distal end, - first and second opposed faces (28, 30, 228, 230) extending lengthwise along at least a portion of the length of the blade, wherein each of said first and second opposed faces has a width that extends perpendicular to the longitudinal axis of the waveguide and a length that extends orthogonal to said width, - a pair of hook portions, said hook portions located on opposite sides of the blade; wherein - each of said first and second opposed faces is flat across its width and includes one or more curved segments (30A, 30B, 228A, 228C) along its length, with each of the curved segments of an individual face being curved in the same direction such that the axes of curvature of each of the curved segments of an individual face are parallel to one another, and the axes of curvature of each of the curved segments of the faces of the blade are perpendicular to a plane which includes the longitudinal axis of the waveguide, and - said blade has sidewalls comprising cylindrical surfaces and extending between the first and second opposed faces along either side of said blade such that said first and second opposed faces are spaced apart from one another, characterized in that - said first and second opposed faces of the blade are spaced apart from one another along their respective lengths, and - each of said hook portions comprises a portion of an outwardly curved surface of revolution extending between the first and second opposed faces of the blade, wherein the axis of said surface of revolution coincides with the longitudinal axis of the waveguide. (a) an elongate waveguide having a longitudinal axis and a distal end; and (b) a blade (24, 124, 224) extending away from the distal end of the waveguide, said blade having: - a length, - a distal end, - first and second opposed faces (28, 30, 228, 230) extending lengthwise along at least a portion of the length of the blade, wherein each of said first and second opposed faces has a width that extends perpendicular to the longitudinal axis of the waveguide and a length that extends orthogonal to said width, - a pair of hook portions, said hook portions located on opposite sides of the blade; wherein - each of said first and second opposed faces is flat across its width and includes one or more curved segments (30A, 30B, 228A, 228C) along its length, with each of the curved segments of an individual face being curved in the same direction such that the axes of curvature of each of the curved segments of an individual face are parallel to one another, and the axes of curvature of each of the curved segments of the faces of the blade are perpendicular to a plane which includes the longitudinal axis of the waveguide, and - said blade has sidewalls comprising cylindrical surfaces and extending between the first and second opposed faces along either side of said blade such that said first and second opposed faces are spaced apart from one another, characterized in that - said first and second opposed faces of the blade are spaced apart from one another along their respective lengths, and - each of said hook portions comprises a portion of an outwardly curved surface of revolution extending between the first and second opposed faces of the blade, wherein the axis of said surface of revolution coincides with the longitudinal axis of the waveguide. - a length, - a distal end, - first and second opposed faces (28, 30, 228, 230) extending lengthwise along at least a portion of the length of the blade, wherein each of said first and second opposed faces has a width that extends perpendicular to the longitudinal axis of the waveguide and a length that extends orthogonal to said width, - a pair of hook portions, said hook portions located on opposite sides of the blade; wherein - each of said first and second opposed faces is flat across its width and includes one or more curved segments (30A, 30B, 228A, 228C) along its length, with each of the curved segments of an individual face being curved in the same direction such that the axes of curvature of each of the curved segments of an individual face are parallel to one another, and the axes of curvature of each of the curved segments of the faces of the blade are perpendicular to a plane which includes the longitudinal axis of the waveguide, and - said blade has sidewalls comprising cylindrical surfaces and extending between the first and second opposed faces along either side of said blade such that said first and second opposed faces are spaced apart from one another, characterized in that - said first and second opposed faces of the blade are spaced apart from one another along their respective lengths, and - each of said hook portions comprises a portion of an outwardly curved surface of revolution extending between the first and second opposed faces of the blade, wherein the axis of said surface of revolution coincides with the longitudinal axis of the waveguide.