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This paper describes a non-contact imaging-based method to detect Stage I pressure ulcers over a wide range of melanin levels. Two approaches were explored: the first used broad and narrow band visible spectrum imaging, and the second used near infrared (NIR) imaging. Preliminary results are presented together with results of numerical analysis of different erythema indices derived from the visible...
This article presents a "Wanderer Monitoring System" application based on radiofrequency identification systems, whose objective is to monitor the movement of individuals with spatial disorientation problems. The system architecture and description is shown, as well as the results of the tasks carried out. The system has been installed in 18 elderly peoples' homes belonging to the Andalusian...
Unobtrusive sleep monitoring allows older adults to have continuous monitoring during the night in their own homes. We propose a method to reliably estimate respiratory rate using a bed-based pressure sensor array. Movements are detected prior to respiratory rate estimation and suppressed. The amount of movement during an estimate and a weighting for the estimate are used to create a reliability metric...
This paper presents some of the fragility issues of a medical video streaming over 802.11e-WLAN in m-health applications. In particular, we present a Medical Channel-Adaptive Fair Allocation (MCAFA) scheme for enhanced QoS support for IEEE 802.11 (WLAN), as a modification for the standard 802.11e Enhanced Distributed Coordination Function (EDCF) is proposed for enhanced medical data performance. The...
Intracardiac impedance can provide real-time hemodynamic information to automatically control the lower and upper rate limits of a rate-adaptive pacemaker. It is necessary to overcome a number of technical challenges to accomplish this within the constraints of an implantable device.
A distributed Personal Health Information Management System (D-PHIMS) has been tested at a nursing home for the senior citizens (NHSC) in Singapore. The Personal Health Information Management System (PHIMS) from the University of Washington was customized to Singapore's context for teledermatology. A clinical trial commenced in October 2005 is ongoing and the survey results obtained indicate that...
Current density imaging (CDI) is an MRI technique used to quantitatively measure current density vectors in biological tissue. A fast CDI sequence was developed that can image the whole body of a 4 kg pig in about 15 minutes. A state of ventricular fibrillation (VF) can be sustained for nearly 30 minutes allowing two complete CDI scans of the same subject. A single parameter, i.e. electrode position,...
Implementing telemedical solutions has become a trend amongst the various research teams at an international level. Yet, contemporary information access and distribution technologies raise critical issues that urgently need to be addressed, especially those related to security. The paper suggests the use of watermarking in telemedical applications in order to enhance security of the transmitted sensitive...
In the last years the development of home based e-health applications, which use information, telecommunication and videoconferencing technologies, is increased because of their characteristics that allow reducing hospitalization costs and managing and monitoring patient health in real time. However, the development of a home based e-health monitoring system requires the contribution of different...
Introduction: TASERs deliver electrical pulses that can temporarily incapacitate subjects. The goal of this paper is to analyze the distribution of TASER currents in the heart and understand their chances of triggering cardiac arrhythmias. Methods and Results: The models analyzed herein describe strength-duration thresholds for myocyte excitation and ventricular fibrillation induction. Finite element...
With the aging population, the number of individuals requiring long-term care is expected to dramatically increase in the next twenty years, placing an increasing burden on healthcare. Many patients are admitted to assisted living facilities at a fairly early stage due to their inability to perform normal daily living activities. The purpose of this study is to determine if the use of technology for...
Hemodynamically unstable ventricular arrhythmias are frequently untreatable with radio-frequency ablation due to the difficulty of rapidly and accurately localizing the site of origin of an arrhythmia with current technologies. We demonstrate a new catheter guidance method that will direct the tip of an ablation catheter to the site of origin of an arrhythmia and reduce the time needed to locate the...
Implanted biosensor networks are a special class of wireless sensor networks used in-vivo for various medical applications. One of major challenges of continuous implanted sensing is the power problems due to implanted sensors' communication cost. A deduction in theory has been made to prove the relationship between energy cost per bit and the data rate of one kind of signal. So choosing an appropriate...
Wearable accelerometry provides easily portable systems that supply real-time data adequate for gait analysis. When they do not provide direct measurement of a spatio-temporal parameter of interest, such as step length, it has to be estimated with a mathematical model from indirect sensor measurements. In this work we are concerned with the accelerometry-based estimation of the step length in straight...
We present the hardware design of an FPGA-based portable device for home screening of sleep apnea syndromes. The device is simple to use, inexpensive, and uses only three signals, namely the nasal air flow and the thorax and abdomen effort signals. The device hardware stores data of overnight sleep on a Secure Digital card. At the clinic, the sleep specialist reads in the stored data and uses an algorithm...
This paper presents an initial formal review of the suitability of currently available actuation technologies for use in fully implantable medical devices, with a focus on applications requiring linear motion. Examples of such applications are a mechatronic hydrocephalus shunt and implantable insulin pumps. Some general basic requirements for fully implantable devices are discussed, followed by an...
In this paper we describe an implementation of a novel fatigue monitoring sensor based on integration of piezoelectric transduction with floating gate avalanche injection. The miniaturized sensor enables continuous batteryless monitoring and time-to-failure predictions of biomechanical implants. Measured results from a fabricated prototype in a 0.5??m CMOS process indicate that the device can compute...
24-hour catheter-based ambulatory pH and impedance monitoring is an essential tool for diagnosing esophageal disorders. However, catheter-based monitoring systems are uncomfortable and interfere with normal activities of the patient. To overcome these disadvantages, different wireless monitoring systems have been proposed. However, efficient ways to position and hold wireless capsules are lacking...
Monitoring of posture change in sagittal plane and walking speed is important for evaluate the effectiveness of rehabilitation program or brace. We have developed a wearable device for monitoring human activity. However, in the previous system, there still remain several drawbacks for practical use such as accuracy in angle measurement, cumbersome cable arrangements, and so on. In order to improve...
This paper is focused on the discussion of different trade-offs that frequently arise when selecting the appropriate antenna technology for a wireless sensor for home-care applications, and the implications that every decision represents for the overall design. In order to devise an optimum design strategy, the main methodological concerns are illustrated with the example of a wearable movement monitor...
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