Sharp Kabushiki Kaisha Corporation

Satoru Motonami

Yuka Utsumi

Daisuke Shinozaki

Takashi Yamashita

Masao Urayama

Hisanori Bessho

Daiji Sawada

A human body is cooled at an appropriate temperature, and a sufficient usage time is ensured. A cooling tool according to one aspect of the present invention is a cooling tool for cooling a human body, including a freezing materialthat undergoes a phase change at a particular temperature and a first container containing the freezing material. The first container transfers heat between the human body and the freezing material at a contact surface in contact with the skin of the human body. At least the contact surface has a thermal effusivity within the possible range of thermal effusivity of the skin of the human body. The contact surface may have a thermal effusivity (J/(m2&#x2dc;S1/2&#xb7;K)) of 1,000 to 2,000.

Cooling tool and treatment tool used in cryotherapy

A heat-storage material that provides a sufficiently large amount of thermal energy as a latent-heat storage material including a semiclathrate hydrate and that improves hysteresis between the solidifying temperature and the melting starting temperature and a refrigerator and a cooling container that include the heat-storage material are provided. The heat-storage material that changes phase at a predetermined temperature includes water, a main agent including a quaternary ammonium salt that forms a semiclathrate hydrate, a pH adjuster that maintains alkaline properties, and a nucleating agent that generates a cation that exhibits positive hydration. In such an aqueous solution maintained to be alkaline, the nucleating agent becomes a nucleus in solidification, and thus, the temperature difference between the solidifying temperature and the melting temperature can be decreased.

Heat-storage material and refrigerator and cooling container that include the heat-storage material

Growing community of inventors

Sakai, Japan

Satoru Motonami