The present invention relates to a high intensity focused ultrasonic (HIFU) medical instrument with dual treatment transducers located around an imaging transducer. The treatment transducers are contained within an exchangeable cartridge. A graphical user interface on a touch-screen allows selection of icons that correspond to different facial regions to be treated. Selection of parameters adapted for a facelift of the selected region is thus possible. The emitted high intensity focused ultrasound is suitable to deliver ultrasonic heat to the superficial musculo-aponeurotic system (SMAS) and the subcutaneous tissue region and thereby perform a facelift (cosmetic surgical operation to remove unwanted wrinkles by tightening the skin of the face) and collagen remodelling effect.