Optical Fibre Sensor for Capillary Refill Time and Contact Pressure Measurements under the Foot
| Autor: | Barrie Hayes-Gill, Hattan Khaled Ballaji, Alison Musgrove, Stephen P. Morgan, Sergiy Korposh, Ricardo Correia, Chong Liu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
genetic structures
Blood volume plastic optical fibre TP1-1185 capillary refill time Biochemistry Article Standard deviation Analytical Chemistry photoplethysmography (PPG) Fiber Bragg grating peripheral arterial disease Photoplethysmogram blood volume changes Humans Medicine Electrical and Electronic Engineering Photoplethysmography Instrumentation Optical Fibers contact pressure medicine.diagnostic_test Foot business.industry Chemical technology Reproducibility of Results Capillary refill medicine.disease Diabetic Foot Atomic and Molecular Physics and Optics Diabetic foot ulcer Shock (circulatory) Curve fitting medicine.symptom optical fibre business fibre Bragg grating (FBG) Biomedical engineering |
| Zdroj: | Sensors, Vol 21, Iss 6072, p 6072 (2021) Sensors Volume 21 Issue 18 Sensors (Basel, Switzerland) |
| ISSN: | 1424-8220 |
| Popis: | Capillary refill time (CRT) refers to the time taken for body tissue to regain its colour after an applied blanching pressure is released. Usually, pressure is manually applied and not measured. Upon release of pressure, simple mental counting is typically used to estimate how long it takes for the skin to regain its colour. However, this method is subjective and can provide inaccurate readings due to human error. CRT is often used to assess shock and hydration but also has the potential to assess peripheral arterial disease which can result in tissue breakdown, foot ulcers and ultimately amputation, especially in people with diabetes. The aim of this study was to design an optical fibre sensor to simultaneously detect blood volume changes and the contact pressure applied to the foot. The CRT probe combines two sensors: a plastic optical fibre (POF) based on photoplethysmography (PPG) to measure blood volume changes and a fibre Bragg grating to measure skin contact pressure. The results from 10 healthy volunteers demonstrate that the blanching pressure on the subject’s first metatarsal head of the foot was 100.8 ± 4.8 kPa (mean and standard deviation), the average CRT was 1.37 ± 0.46 s and the time to achieve a stable blood volume was 4.77 ± 1.57 s. For individual volunteers, the fastest CRT measured was 0.82 ± 0.11 and the slowest 1.94 ± 0.49 s. The combined sensor and curve fitting process has the potential to provide increased reliability and accuracy for CRT measurement of the foot in diabetic foot ulcer clinics and in the community. |
| Databáze: | OpenAIRE |
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