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Healthcare Technology Letters

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https://www.readbyqxmd.com/read/28461902/effect-of-skin-dielectric-properties-on-the-read-range-of-epidermal-ultra-high-frequency-radio-frequency-identification-tags
#1
Dumtoochukwu O Oyeka, John C Batchelor, Ali Mohamad Ziai
This Letter presents an investigation of the effect of human tissue conductivity and permittivity on the performance of epidermal transfer tattoo ultra-high frequency radio-frequency identification (RFID) tags. The measurements were carried out on 20 individuals and the variations in the measured dielectric properties correlate well with variations in the measured tag read range on the individuals and to a lesser extent with their body mass index values. Simulation results also showed the effects of permittivity and conductivity on the designed resonance frequency of the RFID tag...
April 2017: Healthcare Technology Letters
https://www.readbyqxmd.com/read/28461901/technique-to-estimate-human-reaction-time-based-on-visual-perception
#2
Reza Abbasi-Kesbi, Hamidreza Memarzadeh-Tehran, M Jamal Deen
The design and implementation of a wearable system to estimate the human reaction time (HRT) to visual stimulus based on two identical wireless motion sensors are described. Each sensor incorporates a motion sensor (gyroscope), a processor and a transceiver operating at the industrial, scientific and medical frequency of 2.45 GHz. Relevant tests to estimate the HRT are performed in two different scenarios including simple and recognition tests for 90 pairs of measurements. The obtained results are compared with a computer-based system to determine the accuracy of the proposed system...
April 2017: Healthcare Technology Letters
https://www.readbyqxmd.com/read/28461900/common-mode-noise-cancellation-circuit-for-wearable-ecg
#3
Mutsumi Noro, Daisuke Anzai, Jianqing Wang
Wearable electrocardiogram (ECG) is attracting much attention for monitoring heart diseases in healthcare and medical applications. However, an imbalance usually exists between the contact resistances of sensing electrodes, so that a common mode noise caused by external electromagnetic field can be converted into the ECG detection circuit as a differential mode interference voltage. In this study, after explaining the mechanism of how the common mode noise is converted to a differential mode interference voltage, the authors propose a circuit with cadmium sulphide photo-resistors for cancelling the imbalance between the contact resistances and confirm its validity by simulation experiment...
April 2017: Healthcare Technology Letters
https://www.readbyqxmd.com/read/28261493/upper-limb-vibration-prototype-with-sports-and-rehabilitation-applications-development-evaluation-and-preliminary-study
#4
Amit Narahar Pujari, Richard D Neilson, Sumeet S Aphale, Marco Cardinale
Vibration stimulation as an exercise intervention has been studied increasingly for its potential benefits and applications in sports and rehabilitation. Vibratory exercise devices should be capable of generating highly precise and repeatable vibrations and should be capable of generating a range of vibration amplitudes and frequencies in order to provide different training protocols. Many devices used to exercise the upper body provide limited variations to exercise regimes mostly due to the fact that only vibration frequency can be controlled...
February 2017: Healthcare Technology Letters
https://www.readbyqxmd.com/read/28261492/analysis-of-physiological-signals-using-state-space-correlation-entropy
#5
Rajesh Kumar Tripathy, Suman Deb, Samarendra Dandapat
In this letter, the authors propose a new entropy measure for analysis of time series. This measure is termed as the state space correlation entropy (SSCE). The state space reconstruction is used to evaluate the embedding vectors of a time series. The SSCE is computed from the probability of the correlations of the embedding vectors. The performance of SSCE measure is evaluated using both synthetic and real valued signals. The experimental results reveal that, the proposed SSCE measure along with SVM classifier have sensitivity value of 91...
February 2017: Healthcare Technology Letters
https://www.readbyqxmd.com/read/28261491/design-of-smart-neonatal-health-monitoring-system-using-smcc
#6
Debashis De, Anwesha Mukherjee, Arkaprabha Sau, Ishita Bhakta
Automated health monitoring and alert system development is a demanding research area today. Most of the currently available monitoring and controlling medical devices are wired which limits freeness of working environment. Wireless sensor network (WSN) is a better alternative in such an environment. Neonatal intensive care unit is used to take care of sick and premature neonates. Hypothermia is an independent risk factor for neonatal mortality and morbidity. To prevent it an automated monitoring system is required...
February 2017: Healthcare Technology Letters
https://www.readbyqxmd.com/read/28261490/editorial
#7
EDITORIAL
Christopher James
No abstract text is available yet for this article.
February 2017: Healthcare Technology Letters
https://www.readbyqxmd.com/read/28008367/characterisation-of-rollator-use-using-inertial-sensors
#8
Tsu-Jui Cheng, Laurence Kenney, James David Amor, Sibylle Brunhilde Thies, Eleonora Costamagna, Christopher James, Catherine Holloway
The use of walking aids is prevalent among older people and people with mobility impairment. Rollators are designed to support outdoor mobility and require the user to negotiate curbs and slopes in the urban environment. Despite the prevalence of rollators, analysis of their use outside of controlled environments has received relatively little attention. This Letter reports on an initial study to characterise rollator movement. An inertial measurement unit (IMU) was used to measure the motion of the rollator and analytical approaches were developed to extract features characterising the rollator movement, properties of the surface and push events...
December 2016: Healthcare Technology Letters
https://www.readbyqxmd.com/read/28008366/pervasive-assistive-technology-for-people-with-dementia-a-ucd-case
#9
Julia Rosemary Thorpe, Kristoffer V H Rønn-Andersen, Paulina Bień, Ali Gürcan Özkil, Birgitte Hysse Forchhammer, Anja M Maier
Smart mobile and wearable technology offers exciting opportunities to support people with dementia (PwD). Its ubiquity and popularity could even benefit user adoption - a great challenge for assistive technology (AT) for PwD that calls for user-centred design (UCD) methods. This study describes a user-centred approach to developing and testing AT based on off-the-shelf pervasive technologies. A prototype is created by combining a smartphone, smartwatch and various applications to offer six support features...
December 2016: Healthcare Technology Letters
https://www.readbyqxmd.com/read/28008365/development-of-a-prototype-of-portable-fes-rehabilitation-system-for-relearning-of-gait-for-hemiplegic-subjects
#10
Takashi Watanabe, Shun Endo, Ryusei Morita
This study aimed at developing a prototype of portable FES rehabilitation system for relearning gait pattern of healthy subjects, which can measure gait information during walking applying electrical stimulation for foot drop correction or providing timing information. A gait event detection method using an inertial sensor attached on the foot was determined based on gait of healthy subjects from simultaneous measurements with pressure sensors. From the result of comparing the detected gait event timings with EMG signal of the tibialis anterior muscle during walking of healthy subjects, the toe off and the foot flat timings detected by the inertial sensor were suggested to be useful to determine the stimulation timing for the foot drop correction...
December 2016: Healthcare Technology Letters
https://www.readbyqxmd.com/read/28008364/interfacial-pressure-and-shear-sensor-system-for-fingertip-contact-applications
#11
Maria Valero, Nick Hale, Jing Tang, Liudi Jiang, Mike McGrath, Jianliang Gao, Piotr Laszczak, David Moser
This Letter presents a capacitive-based sensor system for fingertip contact applications. It is capable of simultaneously measuring normal (pressure) and tangential (shear) stresses at the interface between a fingertip and external objects. This could be potentially exploitable for applications in the fields of upper limb prosthetics, robotics, hand rehabilitation and so on. The system was calibrated and its performance was tested using a test machine. To do so, specific test protocols reproducing typical stress profiles in fingertip contact interactions were designed...
December 2016: Healthcare Technology Letters
https://www.readbyqxmd.com/read/28008363/muscular-activity-and-physical-interaction-forces-during-lower-limb-exoskeleton-use
#12
Matthew Wilcox, Ashish Rathore, Dafne Zuleima Morgado Ramirez, Rui C V Loureiro, Tom Carlson
Spinal cord injury (SCI) typically manifests with a loss of sensorimotor control of the lower limbs. In order to overcome some of the disadvantages of chronic wheelchair use by such patients, robotic exoskeletons are an emerging technology that has the potential to transform the lives of patients. However, there are a number of points of contact between the robot and the user, which lead to interaction forces. In a recent study, the authors have shown that peak interaction forces are particularly prominent at the anterior aspect of the right leg...
December 2016: Healthcare Technology Letters
https://www.readbyqxmd.com/read/28008362/sensewheel-an-adjunct-to-wheelchair-skills-training
#13
Andrew Symonds, Stephen J G Taylor, Catherine Holloway
The purpose of this Letter was to investigate the influence of real-time verbal feedback to optimise push arc during over ground manual wheelchair propulsion. Ten healthy non-wheelchair users pushed a manual wheelchair for a distance of 25 m on level paving, initially with no feedback and then with real-time verbal feedback aimed at controlling push arc within a range of 85°-100°. The real-time feedback was provided by a physiotherapist walking behind the wheelchair, viewing real-time data on a tablet personal computer received from the Sensewheel, a lightweight instrumented wheelchair wheel...
December 2016: Healthcare Technology Letters
https://www.readbyqxmd.com/read/28008361/fuzzy-logic-based-risk-of-fall-estimation-using-smartwatch-data-as-a-means-to-form-an-assistive-feedback-mechanism-in-everyday-living-activities
#14
Dimitrios E Iakovakis, Fotini A Papadopoulou, Leontios J Hadjileontiadis
This Letter aims to create a fuzzy logic-based assistive prevention tool for falls, based on accessible sensory technology, such as smartwatch, resulting in monitoring of the risk factors of falls caused by orthostatic hypotension (OH); a drop in systolic blood pressure (DSBP) >20 mmHg due to postural changes. Epidemiological studies have shown that OH is a high risk factor for falls and has a strong impact in quality of life (QoL) of the elderly's, especially for some cases such as Parkinsonians. Based on smartwatch data, it is explored here how statistical features of heart rate variability (HRV) can lead to DSBP prediction and estimation of the risk of fall...
December 2016: Healthcare Technology Letters
https://www.readbyqxmd.com/read/28008360/disrupting-the-world-of-disability-the-next-generation-of-assistive-technologies-and-rehabilitation-practices
#15
Catherine Holloway, Helen Dawes
Designing, developing and deploying assistive technologies at a scale and cost which makes them accessible to people is challenging. Traditional models of manufacturing would appear to be insufficient at helping the world's 1 billion disabled people in accessing the technologies they require. In addition, many who receive assistive technologies simply abandon them as they do not meet their needs. In this study the authors explore the changing world of design for disability. A landscape which includes the rise of the maker movement, the role of ubiquitous sensing and the changing role of the 'user' to one of designer and maker...
December 2016: Healthcare Technology Letters
https://www.readbyqxmd.com/read/28008359/editorial-this-is-a-very-dynamic-and-exciting-time-for-assistive-technologies-and-for-tracking-rehabilitation-practices
#16
EDITORIAL
Catherine S Holloway
No abstract text is available yet for this article.
December 2016: Healthcare Technology Letters
https://www.readbyqxmd.com/read/27733934/model-assessing-thermal-changes-during-high-temperature-root-canal-irrigation
#17
Analise Bartolo, Edmond Koyess, Josette Camilleri, Christopher Micallef
The main aim of root canal irrigation is to eliminate micro-organisms. Sodium hypochlorite (NaOCl) is considered to be the ideal material and raising its temperature potentiates the antimicrobial activity. NaOCl may lead to localised tissue necrosis when extruded past the root apex. This study analyses the use of high temperature root canal irrigation as an alternative process for the elimination of microorganisms from the root canal system. An experimental set-up was designed where a constant supply of heat was passed from a heat source through a copper wire inside the root canal...
September 2016: Healthcare Technology Letters
https://www.readbyqxmd.com/read/27733933/efficient-and-robust-ventricular-tachycardia-and-fibrillation-detection-method-for-wearable-cardiac-health-monitoring-devices
#18
Eedara Prabhakararao, M Sabarimalai Manikandan
In this Letter, the authors propose an efficient and robust method for automatically determining the VT and VF events in the electrocardiogram (ECG) signal. The proposed method consists of: (i) discrete cosine transform (DCT)-based noise suppression; (ii) addition of bipolar sequence of amplitudes with alternating polarity; (iii) zero-crossing rate (ZCR) estimation-based VTVF detection; and (iv) peak-to-peak interval (PPI) feature based VT/VF discrimination. The proposed method is evaluated using 18,000 episodes of different ECG arrhythmias taken from 6 PhysioNet databases...
September 2016: Healthcare Technology Letters
https://www.readbyqxmd.com/read/27733932/characterisation-of-the-complexity-of-intracranial-pressure-signals-measured-from-idiopathic-and-secondary-normal-pressure-hydrocephalus-patients
#19
Tricia Adjei, Daniel Abásolo, David Santamarta
Hydrocephalus is a condition characterised by enlarged cerebral ventricles, which in turn affects intracranial pressure (ICP); however, the mechanisms regulating ICP are not fully understood. A nonlinear signal processing approach was applied to ICP signals measured during infusion studies from patients with two forms of hydrocephalus, in a bid to compare the differences. This is the first study of its kind. The two forms of hydrocephalus were idiopathic normal pressure hydrocephalus (iNPH) and secondary normal pressure hydrocephalus (SH)...
September 2016: Healthcare Technology Letters
https://www.readbyqxmd.com/read/27733931/performance-of-human-body-communication-based-wearable-ecg-with-capacitive-coupling-electrodes
#20
Jun Sakuma, Daisuke Anzai, Jianqing Wang
Wearable electrocardiogram (ECG) is attracting much attention in daily healthcare applications, and human body communication (HBC) technology provides an evident advantage in making the sensing electrodes of ECG also working for transmission through the human body. In view of actual usage in daily life, however, non-contact electrodes to the human body are desirable. In this Letter, the authors discussed the ECG circuit structure in the HBC-based wearable ECG for removing the common mode noise when employing non-contact capacitive coupling electrodes...
September 2016: Healthcare Technology Letters
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