Comparative of sensors to assess tissue viability

Date: 04/02/13

Location: IBV facilities, Valencia (Spain)

pro updated usersThe sensor selection is not only based on the technical specifications to measure tissue viability but also on easy to use, non-invasive device, portability, costs and easy to embed on smart textiles. Due these boundaries conditions laser Doppler, transcutaneous pO2, pulse oximetry and impedance spectroscopy techniques were chosen for the assessment

Laser Doppler monitoring is a non-invasive system based on a laser to monitor blood flow in the capillary bed of the tissue.

Pulse oximetry ia non-invasive procedure based on ligth of two wavelengths that is passed through the patient to a photodetector, allowing the monitoring of the saturation of a patient's haemoglobin.

Transcutaneous pO2 non-invasive system that measure the partial pressure of oxygen in subcutaneous tissue trhought applying heat to the skin. The technique obtains the O2 pressure in blood

The impedance spectroscopy is the measurement of tissue impedance over a range of frequencies. The impedance is determined by injecting a subthreshold current into the desired tissue and recording the resultant voltage.

10 healthy users were involved in the test. Each user was measured three times in different days to assess repeatability and robustness of sensor measurements.