Health detection is a medical health detector and health sensing original product for medical lighting in addition to medical resources, medical guidance and other information display, and functional lighting inside and outside medical buildings.
Medical health detection, such as peeping lighting, is mainly used for focus detection and observation, and is also a transmission type, small angle, directional lighting lamp, which can be divided into internal peeping and external peeping. The external peep is a movable directional lighting lamp, such as laryngoscope lamp, oral lamp, etc. Currently, halogen lamp is mainly used. The internal peep is to cooperate with optical fiber for the internal peep of stomach, intestine, anus, etc. Currently, LED is mainly used as the light source. In phototherapy photoradiation therapy, photobiological effect is used to stimulate or inhibit the growth of human skin or some tissue cells with light of specific wavelength to achieve the therapeutic purpose. The efficacy of LED light source for phototherapy is becoming prominent. Compared with traditional light source, LED is more in line with the special requirements of light source for phototherapy. It is characterized by wide selection range of light wavelength, controllable and adjustable radiation light quantity and radiation spot, pure light color, no harmful spectral components, and electrical safety.
With the growing popularity of "quantitative life movement", people are increasingly interested in medical measurement methods that can be integrated into so-called wearable gadgets such as watches, smartphones or fitness bracelets. This interest began with a fitness tracker that used acceleration sensors to measure the gait frequency. Nowadays, optical sensors can also directly measure heart rate and blood oxygen saturation, further expanding the possibility of self observation. In addition, it is more convenient to measure the pulse on the wrist or fingers than to wear a chest band. Last but not least, the optical method also has advantages in terms of economy, because the new technology of efficient LED can realize higher energy efficiency and more compact sensors. The sensor emits green light, red light or infrared light, which irradiates the skin or tissue and is absorbed or reflected. The amount of reflected light recorded by the detector changes with the blood volume in the artery (photoelectric plethysmography). For wrist, measure with green light; For the finger part, use the red light wavelength or infrared wavelength for measurement.
The product design of health sensing elements is divided into transmitter and receiver. The transmitter generally uses green LED and infrared LED to detect the amount of blood flowing through the wrist at a specific time to obtain the heartbeat value. If red LED is used with infrared LED, the difference between deoxygenated heme and oxygenated heme at a specific time can be obtained, thereby converting the blood oxygen concentration. The receiving end uses a large area photodiode with low dark current to quickly respond and fully receive LED energy.