Research on Biomedical Engineering
http://www.rbejournal.periodikos.com.br/article/5889fbb75d01231a018b476b
Research on Biomedical Engineering
Original Article

CENTRAL MICROPROCESSADA PARA MONITORACAO DE FOTOTERAPIA

MICROCOMPUTERIZED PHOTOTHERAPY CENTRAL MONITOR

Lopes, H.S.; Netto, E.J.; Wang, B.

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Resumo

A eficácia da fototerapia no tratamento de hiperbilirubinemia neonatal depende fundamentalmente da irradiância detectada ná faixa de 400 a 500 nm. Utilizando transdutore. ópticos sensíveis ao espectro ótimo de fotodegradação da bilirrubina. foi projetada e construída uma central baseada no microprocessador Z80. O protótipo é capaz de monitorar simultaneamente até oito unidades de tratamento fornecendo o valor instantâneo da irradiância (uW/cm2) ou irradiância espectral (uW/cm2/n.). Através da integração discreta do sinal de irradiância, a central determina a densidade de energia (dose acumulada), em J/c.2, entregue ao neonato durante o período de tratamento. Estes valores calculados são comparado. continuamente com a dose programada inicialmente para cada canal piscando o LED correspondente se a última for alcançada. O cálculo da dose pode ser interrompido e reiniciado independentemente para cada canal, permitindo a higienização e alimentação do recém-nascido.

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Abstract

The efficacy of phototherapy in the treatment of neonatal jaundice depends fundamentally on the level of irradiance of light delivered in the range of 400 to 500 nm. Using optical transducers specially tuned to the optimal response spectrum of bilirrubine photo degradation, a Z80 microprocessor based phototherapy monitor was designed and built. The prototype is capable of monitoring simultaneously up to eight phototherapy units, providing the instantaneous readings of irradiance in uW/cm2 or spectral irradiance in uW/cm2 /nm. lf an imput were below a presetable minimum level, a flashing LED alarm corresponding to that particular channel is triggered. Through discrete integration of the irradiance signals, the station computes the energy density (accumulated dose), in Joules/cm2 , actually delivered to each patient during his entire treatment period. These computed values are compared continuously with total doses programmed by nurses previously and independently for each patient, and a corresponding LED is switched on when the preset value is reached. The dose calculation can be interrupted and restarted for each channel independently so as to allow infant feeding and other manipulations. Besides assuring the efficacy of phototherapy, this instrument reduces the need of frequent blood sampling and analyses.
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