Teoria de Funcionamento:

As with electrical simulation, optical simulation synchronizes with the ECG signal and allows for variation of signal saturation, frequency and amplitude (perfusion). Pulse oximetry (SpO2) determines the value of oxygen saturation and peripheral pulse frequency using spectrophotometry and plethysmography techniques.

Oximetry sensors have two light emitters with different wavelengths at the top, one red and one infrared. At the bottom, it has a photodetector capable of measuring the amount of light of each type that passes through the finger.

When crossing the finger, these light emissions change depending on various conditions: tissue thickness, venous blood, arterial blood, bone, cartilage, skin color, etc. Oxyhemoglobin and deoxyhemoglobin absorb red radiation differently from infrared radiation. The relationship between the absorptions for 2 wavelengths used in the pulsatile part (arterial blood) determines the value of oxygen saturation.

The HS-F works as an optical simulator by reading the signal from the oximetry sensor emitters and modulating the brightness so that the connected sensor photodetector reads the oximetry.