World's smallest laser blood flowmeter for non-invasive blood flow monitoring    What kind of technology is it? By precisely integrating a laser diode, photodiode, and optical waveguide onto a single chip, we have succeeded in downscaling what used to be a desktop scale laser blood flowmeter to a tiny device that can be worn on the wrist. The sensor head, which is placed in contact with a fingertip, consists of optical elements precisely mounted on a chip with 1-micrometer accuracy using advanced micromachining and surface mounting technologies. Measurement data sent wirelessly can be displayed or recorded. The blood flow variations that can be detected by the diminutive device are virtually identical to those provided by larger commercially available blood flowmeters.        What are the features? World's smallest wrist-strap type blood flow sensor. No optical fiber is used, so measured data are not adversely affected by vibration. Measurement data are sent wirelessly, and can be displayed or recorded.      What can it do? Can be used for real-time assessment of physical condition with applications to home medical care, sports medicine, etc. Can be used to monitor blood flow to help control lifestyle diseases in line with health guidelines. Will be able to change medical services from treatment to prevention, and from hospital-oriented health care to home-oriented health care.