NIRS Devices

Technologies for Wellness and Happiness

Hb131S Type Brain Checker

Sun Visor Type Brain Checker (NIRS)

Wearable brain checker(NIRS) is a sensor that non-invasively measures changes in the blood flow of the frontal lobe.
Despite many researchers are focusing on the blood flow change because the mental factors affect to the blood flow, the brain NIRS,so far,did not satisfy the requirement of stress-free measurement for long period with a strong sense of oppression of the head by a heavy NIRS system.
Hb131S is an epoch-making device that can measure changes in the flow of the frontal lobe by applying a newly developed ultra-thin NIRS plate inside the sun visor. Consequently, Hb131S reduces the oppression of the head when measurement.
By Hb131S, elderly people with dementia or children with developmental disorders can easily wear the NIRS devices.
The measurement algorithm is developed by Shizuoka University andquantitativeness of the change was confirmed by measuring simultaneously with PET using oxygen isotope by Nuclear Medicine course of integrated university.

Hb13 Type Multi-Channel Brain Checker

8CH-Brain Checker(NIRS)

Measuring blood flow in a brain non-invasively, brain NIRS acts as a sensor and visualizes changes of blood flow in the frontal lobe. As it measures the blood flow in a surface and deep layer separately, it is possible to distinguish changes in blood flow by sympathetic nerves.
ASTEM adopts the patended algorithm developed by Shizuoka University for practical measurements that was evaluated it in Psychiatric Department of the university hospital.

Multi-channel Tissue Oxygenation monitor (Hb14-N)


  • Algorithm: unique space-resolved NIRS algorithm patented by Shizuoka University 
  • By setting the subcutaneous tissue thickness, the measured value is equivalent to the absolute value
  • Flexible structure that also fits curved surface of human body
  • Probe weight is only 10g, made from silicone rubber
  • Wireless, Blue-tooth Ⅱ (available distance max 10m)
  • Measurement data is displayed in real time on the PC, and it is saved in CSV file format at the same time

Technical Concept

As shown in the figure on the left, the probe attached to the human body surface irradiates two near infrared rays of different wavelengths from the LED, and detects the light transmitted through the inside of the living body with the light receiving element, Measure oxygen concentration non-invasively.

To eliminate insufficient quantitativeness due to the influence of the subcutaneous fat layer as the most characteristic, spatial inclination of the living tissue was obtained by using two light receiving elements of different distances, and the precision of the relational expression was improved It is in.

Therefore, as a result of eliminating the influence of the subcutaneous fat layer as much as possible, the measurement error is within 2 to 3%, close to the absolute value as much as possible compared to the conventional method.


ASTEM NIRS Devices can not be used for medical practice. Please be approved by hospital ethics committee if these devices are used.