An ultrasonic surgical instrument having a proximal portion forming a socket attached to an ultrasonic vibration generating device, and a distal portion, the instrument extending from the proximal portion to the distal portion along a main longitudinal axis, said instrument comprising a fluid channel, wherein the distal portion comprises a cutting portion, a fluid port and one or two radial bumps extending radially outwardly, such radial projections having a longitudinal position corresponding substantially to the longitudinal position of the cutting portion, whereby the radial bump provides a mark and/or a tactile location point beneath the skin for the surgeon, for use in rhinoplasty or jaw surgery.
