Balanced ultrasonic curved blade

An ultrasonic surgical device, comprising:

• an elongated waveguide configured to transmit ultrasonic energy therethrough, the elongated waveguide comprising a center-line extending through the center of mass of the elongated waveguide;
• an end-effector provided at the distal end of the waveguide, the end-effector comprising a curved portion having a positive curvature, the positive curvature of the curved portion producing an offset of the center of mass of the curved portion;
• and
• an anti-curved portion positioned between the elongated waveguide and the curved portion, the anti-curve having a negative curvature, the negative curvature configured to correct the offset of the center of mass of the curved portion, thereby substantially balancing the ultrasonic surgical device;
• and
• a first notch positioned proximal to the end-effector, the first notch axis at an acute angle to the center-line;
• and
• a second notch positioned proximal to the first notch.