Patent ID: 8136800

Claim:
A device for increasing blood flow and an insulin-like growth factor, comprising: a bathtub; and nano bubble-producing means for producing carbonic gas nano bubbles in bath water in the bathtub; the nano bubble-producing means includes: a first gas-shearing section for mixing the bath water and carbonic gas and shearing a mixture of the bath water and the carbonic gas so as to produce water containing carbonic gas micro bubbles; and a second gas-shearing section for mixing and shearing the water so as to produce water containing carbonic gas nano bubbles; wherein each of the first gas-shearing section and the second gas-shearing section includes a cylindrical flow path through which water containing bubbles flows, and the flow path of the first gas-shearing section is larger than the flow path of the second gas-shearing section in terms of a diameter of a circle being a cross section of the flow path.