Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"Pulse oximeter"”.
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PDA based ambulatory pulse oximeter
… aim of the research was to develop an ambulatory pulse oximeter which can be used to monitor the SpO_2 heart rate (HR) and plethsymograph (PPG) waveform of a person. To achieve this, an algorithm was developed in LabVIEW 8.0 to extract the HR, SpO_2 and PPG data from a Nonin Xpod device, Nonin …
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Perioperative comparison of the agreement between a portable fingertip pulse oximeter vs. a conventional bedside pulse oximeter in adult patients (COMFORT trial)
Background: Low-cost, portable fingertip pulse oximeters are widely available to health professionals and the public. They are often not tested to ISO standards, or only undergo accuracy studies in healthy volunteers under ideal laboratory conditions. This study aims to pragmatically evaluate the …
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Power-efficient and high-performance interference resilientpulse oximeter
This thesis presents a novel sigma delta-based pulse oximeter with higher resilience against ambient light interference in comparison to the conventional pulse oximeters available in the market. The pulse oximeter reported in this thesis uses a novel cross-coupled sigma delta modulator to drive the …
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The utility of occlusion of the pulse oximeter trace in the estimation of systolic blood pressure during spinal anaesthesia for caesarean section: the effect of body mass index
… blood pressure (SBP) by disappearance of the pulse oximeter trace (DOT), with noninvasive blood pressure (NIBP) measurement, across the range of body mass index (BMI), during spinal anaesthesia (SA) for caesarean section (CS). Methods: Three groups of 25 parturients were recruited, with BMI of …
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False arrhythmia alarm suppression using ECG, ABP, and photoplethysmogram
… the photoplethysmogram waveform recorded by a pulse oximeter has been created. The signal quality algorithm uses statistical methods on time-series and spectral analysis to locate high-frequency segments of the photoplethysmogram waveform. A photoplethysmogram pulse onset detector has been …
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The development of biomedical instrumentation using backscattered laser light
… the techniques of laser Doppler flowmetry and pulse oximetry. An investigation of the responses of Doppler flowmeters using different signal processing bandwidths and laser sources revealed two major findings. Firstly, that careful choice of processing bandwidth is required in order to sample …
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In vivo investigations of photoplethysmograms and arterial oxygen saturation from the auditory canal in conditions of compromised peripheral perfusion
Pulse oximeters rely on the technique of photoplethysmography (PPG) to estimate arterial oxygen saturation (SpO2). In conditions of poor peripheral perfusion such as hypotension, hypothermia, and vasoconstriction, the PPG signals detected are often small and noisy, or in some cases unobtainable. …
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Investigation of fontanelle photoplethysmographs and oxygen saturations in intensive care neonates and infants utilising miniature photometric sensors
… determined non-invasively by a device called a pulse oximeter. Sensors are usually placed on a hand or foot where their operation relies on the presence of pulsatile arterial blood. Light shines at two or more wavelengths (usually red and infrared) into the tissue where the pulsatile blood …
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Development of an Oxygen Saturation Monitoring System by Embedded Electronics
… health monitoring. This is often measured by pulse oximeter, which is standard measure during anesthesia, asthma, operative and post-operative recoveries. Despite all, monitoring Oxygen level is necessary for infants with respiratory problems, old people, and pregnant women and in other …
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An analog VLSI front end for pulse oximetry
Pulse oximetry is a fast, noninvasive, easy-to-use, and continuous method for monitoring the oxygen saturation of a patient's blood. In modem medical practice, blood oxygen level is considered one of the important vital signs of the body. The pulse oximeter system consists of an optoelectronic …
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ARTERIAL WAVEFORM MEASUREMENT USING A PIEZOELECTRIC SENSOR
… a new method to monitor peripheral arterial pulse using a PVDF piezoelectric sensor. After comparing different locations of sensor placement, a specific sensor wrap for the finger was developed. Its composition, size, and location make it inexpensive and very convenient to use. In order to …
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Defensive Neurophysiological Response: Exploring the Neural and Autonoic Correlates of Social Behavior
… magnetic resonance imaging) and autonomic (via pulse oximeter and plethysmogram) data were collected. Results indicated that decreased insula and amygdala activity during physiological hyper-aroused states predicted symptoms associated with ASD, and predicted higher levels of comorbid anxiety, …
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Dyspnea: Effect of Auricular Acupressure in End Stage Lung Cancer Patients, a Pilot Feasibility Study
… Scale and oxygen saturation was measured by pulse-oximeter. Qualitative questions were asked on Days 1 and 4. A trained professional administered the acupressure intervention after baseline assessments. Design -The experimental design included 3 conditions with eight measurement points in …
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Power efficient machine learning-based hardware architectures for biomedical applications
… the chest movement and SpO2 measurement from the pulse oximeter to predict the occurrence of SA episodes. In the training phase, actual patient data is used, and the network model is converted into the proposed hardware models to achieve medically backed accuracy. After achieving acceptable …
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Investigation of splanchnic perfusion utilising an intraluminal opto-electronic sensor placed in the duodenum
… to the surgical site, monitoring of duodenal pulse oximetry signals could not be done in a continuous way. Also, the presence of moderate respiratory modulation in otherwise good quality, high amplitude signals seemed to result in an underestimation of arterial blood saturation of 2%. A …
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Design and development of a low cost heart best monitor device using finger photoplethysmography technique :|bcircuit design and fabrication of a non-invasive heart beat monitoring device that employs reflectance and transmission mode photoplethysmography using parallel port interface and microcontroller PIC16F84A.
… three phases. First is the detection of weak pulses through the fingertip. The PPG signal is then amplified, filtered and digitized by the signal processing unit. Finally the heart rate is calculated, analyzed and displayed on the computer using parallel port interface and on the liquid …
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Low-dose thiafentanil in combination with azaperone alone or azaperone and medetomidine for the immobilization of African buffalo (Syncerus caffer)
… 1, HANNA Instruments (Pty) Ltd., USA), a pulse oximeter (Veterinary Pulse Oximeter, Model 9847V, Nonin Medical, USA) to measure the peripheral oxygen haemoglobin saturation (SpO2) and a multi-parameter monitor (M3T Mini vet, TooToo Meditech, China) which was used to measure the end-tidal …
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A Robust Algorithm for Identification of Motion Artifacts in Photoplethysmography Signals
… using 3 datasets, where we record the PPG from a pulse-oximeter attached to a finger with subjects making (1) random finger movements, (2) periodic movements like periodic finger tapping and (3) PPG recordings from Maxim smartwatch with subjects running on a treadmill. Dataset (2) and (3) are …
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Optical sensors for the in vivo assessment of flap perfusion in plastic surgery
… with SpO2 values recorded from the commercial pulse oximeter attached to the patients’ finger. The flap PPGs were compared with PPGs and SpO2s acquired from the finger of a small number of patients using a custom made reflectance finger PPG probe, optically and electrically, identical as the …
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Transformative Science Education Through Action Research And Self-Study Practices
… the history of oximetry and ways in which an oximeter can be used to obtain information on the physiological expression of emotions. I examine oximetry data in relation to emotional physiology in three different aspects; pulse rate, oxygenation of the blood, and plethysmography (i.e., strength …
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