The SONOtrain™ Gallbladder model is an ultrasound block that has three gallbladders with different pathologies: Gallstones (diameter: 8 and 10 mm), thickened gallbladder wall and biliary sludge deposit.√ä The gallstones and the sludge in the gallbladder model can move around and react to changes in position. The material of the SONOtrain™ trainer simulates the feel of real soft tissue for carrying out palpations and injections and shows realistic texture and echogenicity on ultrasound images. The SONOtrain™ trainer is easy to use as a teaching tool for basic training and for improving dexterity and hand-eye coordination skills.