Ultrasonic medical device for skin treatment and cooling cap therefor

An ultrasonic medical device for skin treatment, the ultrasonic medical device comprising:

• a main body configured to generate electrical energy;
• and
• a handpiece configured to convert the electrical energy into ultrasonic waves and to emit the ultrasonic waves to skin,
• wherein the handpiece comprises:
• a wand connected to the main body by a cable and configured to receive the electrical energy from the main body;
• and
• an ultrasonic cartridge coupled to the wand, the ultrasonic cartridge being configured to convert the electrical energy into the ultrasonic waves and to emit the ultrasonic waves to the skin through an acoustic permeable window,
• wherein a cooling cap is coupled to the ultrasonic cartridge, and
• wherein the cooling cap comprises:
• a housing having a space therein and having a hollow column shape in which a center portion thereof is penetrated;
• and
• a refrigerant accommodated in the space,
• wherein the cooling cap further comprises:
• a first housing configured to be brought into contact with an outer surface of the ultrasonic cartridge when the cooling cap is coupled to the ultrasonic cartridge, the first housing defining a first space therein, in which the first space is separated from an outside of the cooling cap;
• and
• a second housing formed in the first space, the second housing defining a second space therein, in which the second space is separated from the first space,
• wherein the first housing and the second housing are at least partially spaced apart from each other, and
• wherein the refrigerant is accommodated in the second space.