Gluteal fat grafting, commonly known as the Brazilian Butt Lift (BBL) procedure, is among the fastest growing aesthetic procedures in the United States. Demand has more than doubled in the past five years despite highly publicized media reports of serious injuries and deaths. The BBL procedure involves liposuction of unwanted fat from the waist or thighs followed by injection of the fat into the buttocks using a thin tube, or cannula. During the injection, the cannula is passed blindly through tissue risking internal injuries, punctured blood vessels, and formation of deadly blood clots as fat enters the bloodstream. In 2017, a task force representing several plastic surgery associations reported that BBL complications killed an estimated 1 in 3,000 patients; in comparison, cosmetic procedures in general result in an estimated 1 in 50,000 deaths. Our tissue sensing technology alerts the surgeon when the cannula contacts muscle or blood so that it can be immediately repositioned. Increased safety measures of the type our technology would provide are in high demand as patients continue to choose BBL despite the risks.