Abstract: Microfocused ultrasound is a new technique to treat skin laxity and rhytides. Over the past several years, the safety and efficacy of microfocused ultrasound have been well documented and widely used in brows,periorbital region,lower face, neck, chest, buttocks, arms, thighs and knees. As a novel and non-invasive technology, it has the following characteristics: Firstly, it can precisely and selectively focus the thermal injury at pre-selected depths without heat injury;Secondly, the "see and treat" system allows visualization and treatment simultaneously; Thirdly, ultrasound energy is not absorbed by melanin, thus it is safe even for darker skin types theoretically. In this paper, the progress of ulthera in the treatment of skin laxity and rhytides was reviewed from the aspects such as pre-procedure preparation, procedural approach, complications and outcomes.

Key words: Microfocused ultrasound, Skin laxity, Rhytide