Body surface blood vessel cooling instrument and use method

The invention relates to the technical field of medical apparatus and instruments, in particular to a body surface blood vessel cooling instrument and a using method thereof.The body surface blood vessel cooling instrument comprises a limb wearing sleeve, a semiconductor phase change cooling unit, a digital temperature control unit, a temperature measuring probe A, a heat preservation layer and a power supply device; wherein the phase change cooling unit is connected with the digital temperature control unit, and the digital temperature control unit is arranged on the limb wearing sleeve; a heat preservation layer is arranged on the limb wearing sleeve, and the phase change cooling unit is embedded in the heat preservation layer; the digital temperature control unit is connected with a temperature measuring probe A through a wire, and the temperature measuring probe A is attached to the body surface. The power supply device is electrically connected with the semiconductor phase change cooling unit and the dig