Continuous Non-invasive Arterial Pressure, CNAP combined with Pulse Oximetry (CNAP - SpO2)

Project Type: Master/Diploma Thesis
Student: Feuersinger Andreas
Mentor: Gernot Kubin



 Non-invasive measurement of pulse is one of the oldest and most used diagnosis methods. For the automatisation of pulse measurement, the method of Photoplethysmography is used. Two methods based on this technology emerged to standards in clinical care. The first is Continuous Noninvasive Arterial Pressure (CNAP) an improvement of the "vascular unloading technique" to measure arterial blood pressure non-invasively. CNAP was developed by CNSystems Medizintechnik AG. The second is Pulse oximetry, introduced by Nellcor (now Convidien) in 1983 as a noninvasive method for monitoring the arterial oxygen saturation of the patient's blood. The goal of the thesis is to combine these two technologies and extend the CNSystems CNAP. Thus, hardware and software is being extended to work with two LEDs instead of one. Further a patent of CNSystems is being introduced proposing the improvement of the controller of the CNAP. Finally algorithms are being developed to measure oxygen saturation during ongoing measurement of continuous non-invasive arterial pressure. Achieved results are presented and evaluated and provide promising results for the developed system to succeed.