The Optomechanical Design And Research Of Jaundice Phototherapy Apparatus Using Blue-green Light Emitting Diode

Neonatal jaundice is a common disease in newborn infants. Phototherapy is aconvenient and effective treatment for it. Basing on the investigation of the existingdomestic and international related equipment, jaundice phototherapy apparatus usinghigh brightness blue and green LED is expected to be developed, which will bebetter in efficacy as well as causing less side effects. High brightness LED hasadvantages in narrow spectral bandwidth, high density of emitted light，long life andcold light source. It is the ideal light source for providing safe and effectivephototherapy. This paper mainly researched the optical and sutrcture design ofjaundice phototherapy devices. The main achievements of this paper are as follows:Firstly, the optical design of high uniformity and brightness illumination isstudied in this paper. The upper light source system uses13LED modules while thebottom one uses10. The blue and green LED chips are packaged together on eachmodule. These modules are arranged in a specific order to achieve uniformillumination. Optical simulation software TracePro is used for the analysis of lightenergy distribution. The optimized optical model is obtained through continuousfeedback and optimization.Secondly, structural design as well as assembly and adjustment of theengineering prototype is completed. Combining the structures and features of the phototherapy module with other function modules, the engineering prototype ofLED jaundice phototherapy apparatus is successfully manufactured. Experimentalresults show that the power density of blue light can achieve2mW/cm2and greenlight1.5mW/cm2in the effective phototherapy area (200mm×500mm). Theirradiation uniformity is better than0.8.Finally, an improved design scheme of upper light source is proposed. Fly-eyelens optical system is introduced into the field of phototherapy for the first time. Byusing two high-power LED modules, for both blue and green lights, the illuminationpower density over2mW/cm2and uniformity better than0.9is achieved in the samethototherapy region. In comparison with the original one, this improved opticalsystem is smaller in size, higher in illumination intensity and more energy saving.