Background Info

What is blood oxygenation?

Blood Oxygenation describes the process of transporting blood throughout the circulatory system in order for respiration to occur. Respiration is vital for a cell to obtain energy that drives life processes. During this oxygenation process, the hemoglobin in red blood cells reacts with oxygen. The oxygenated blood circulates through the body, supplying tissue cells with oxygen. Once the blood cells become deoxygenated, they return back to the heart to become oxygenated once again.

What is pulse oximetry?

Pulse Oximetry non-invasively measures the amount of dissolved oxygen in blood, or oxygen saturation (SpO2). To do this, two wavelengths of different length (red light, 660nm and infrared light, 940nm) are passed through the blood. The absorption of oxygenated hemoglobin compared to deoxygenated hemoglobin differs at these different wavelengths. At 660nm, deoxygenated hemoglobin has a higher absorption, while oxygenated hemoglobin has higher absorption at 940nm. A photodetector can detect the varied amounts of non-absorbed light passed through the blood to then calculate an absorption ratio and related SpO2.

What is the problem?

Evidence has shown that pulse oximeter use in children can reduce mortality rate. However, though a widely used, standard healthcare device, the pulse oximeter has changed very little since its introduction in 1987.

Pulse oximeters on the market today still incorporate a finger based probe to take blood oxygen readings. Even the most recent wearable devices that measure blood oxygen saturation (SpO2) do so with a bulky, cumbersome device attached with inconvenient wires to a wristband or a secondary device component. Furthermore, pulse oximeters and wearable monitoring devices in general are extremely limited for children.


Troxie aims to tackle these problems.