1,721,054 research outputs found
A Low-power Analogue SC-CMOS Filter suitable to implement the Wavelet Algorithm to analyse ECG signals in Pacemakers
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PDMS Selective Bonding for the Fabrication of Biocompatible All Polymer NC Microvalves
No full textMicrovalves are commonly used in microfluidic systems to control precisely the liquid flow. In this paper, the design and fabrication of a normally-closed (NC) all-polymer membrane-type microvalve is described. The microvalve with a diameter and thickness of 5mm and 3 mm, respectively, is fabricated completely in biocompatible polydimethylsiloxane (PDMS). The opening pressure, which depends on the adhesion between the membrane and the slab, is reduced to the noticeably low value of 3.4 kPa by the surface oxidation of the PDMS layers. This technique in combination with a selective bonding by Polyethylene terephthalate (PET) shadow masking allows for the fabrication of a high reverse pressure microvalve (no flow up to 0.6 MPa reverse pressure). Other major fabrication steps include PDMS doctor-blading and soft lithography in order to fabricate the thin and surface patterned membranes, respectively. The presented microvalve features a minimum flow rate of 1.0 ml min(-1)
Stretchable biocompatible electronics by embedding electrical circuitry in biocompatible elastomers
No full textStretchable and curvilinear electronics has been used recently for the fabrication of micro systems interacting with the human body. The applications range from different kinds of implantable sensors inside the body to conformable electrodes and artificial skins. One of the key parameters in biocompatible stretchable electronics is the fabrication of reliable electrical interconnects. Although very recent literature has reported on the reliability of stretchable interconnects by cyclic loading, work still needs to be done on the integration of electrical circuitry composed of rigid components and stretchable interconnects in a biological environment. In this work, the feasibility of a developed technology to fabricate simple electrical circuits with meander shaped stretchable interconnects is presented. Stretchable interconnects are 200 nm thin Au layer supported with polyimide (PI). A stretchable array of light emitting diodes (LEDs) is embedded in biocompatible elastomer using this technology platform and it features a 50% total elongation
The microphotogrammetry as a portable diagnostic tool for monumental surface monitoring
No full textThis paper shows the application of a portable microphotogrammetry tool to analyze surface pattern (colour and geometry) with 50μm accuracy. 3D reconstruction is not the main target of the system that is oriented to perform high precision measurements on plane surfaces
Reliable stretchable gold interconnects in biocompatible elastomers
No full textOne of the key issues in realization of stretchable and curvilinear electronics is the fabrication of stretchable interconnects. Stretchable interconnects are basically conductor lines embedded in elastomer substrates. Currently, metal interconnects embedded in polydimethylsiloxane are one of the major candidates. In this work, a novel straightforward method is presented that allows the fabrication of 20 mu m wide stretchable gold interconnects starting from commercial double sided flexes (CuPICu). These interconnects are still fully functional after a minimum of 100 k cycles at 40% elongation. In addition to outstanding reliability in this method of fabrication, fine pitch and biocompatibility are the added values paving the way for medical grade stretchable electronics
Wireless Medical Systems and Algorithms: Design and Applications
No full textWireless Medical Systems and Algorithms: Design and Applications provides a state-of-the-art overview of the key steps in the development of wireless medical systems, from biochips to brain–computer interfaces and beyond. The book also examines some of the most advanced algorithms and data processing in the field.
Addressing the latest challenges and solutions related to the medical needs, electronic design, advanced materials chemistry, wireless body sensor networks, and technologies suitable for wireless medical devices, the text:
Investigates the technological and manufacturing issues associated with the development of wireless medical devices
Introduces the techniques and strategies that can optimize the performances of algorithms for medical applications and provide robust results in terms of data reliability
Includes a variety of practical examples and case studies relevant to engineers, medical doctors, chemists, and biologists
Wireless Medical Systems and Algorithms: Design and Applications not only highlights new technologies for the continuous surveillance of patient health conditions, but also shows how disciplines such as chemistry, biology, engineering, and medicine are merging to produce a new class of smart devices capable of managing and monitoring a wide range of cognitive and physical disabilities
Feasibility Study and Performance Analysis of a Gyroless Orientation Tracker
No full textInertial orientation tracking systems commonly use three types of sensors: accelerometers, magnetometers, and gyroscopes. The angular rate signal is used to obtain a dead reckoning estimate, whereas the gravitational and local magnetic field measures allow us to apply a correction and to obtain a drift-free result. Considering the present market of inertial MEMS sensors, the current consumption of gyroscopes represents a major part of the power budget of wireless inertial sensor nodes, which should be minimized given the mobility of the application. This paper introduces an orientation tracking algorithm, based on an unscented Kalman filter, that does not require angular rate data for tracking human movements up to 450 degrees/s, which is a reasonable value for many applications. Since accelerometers measure other accelerations beside gravity and magnetometers are prone to magnetic disturbances, adaptive techniques are applied in order to reduce the influence on the estimations. The performance of the system is quantitatively analyzed and compared to an estimator that includes angular rate information
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