The Experts below are selected from a list of 15114 Experts worldwide ranked by ideXlab platform
Thomas S Roukis - One of the best experts on this subject based on the ideXlab platform.
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the effectiveness of physician directed external fixation pin site care in preventing pin site infection in a high risk patient population
Foot and Ankle Specialist, 2008Co-Authors: Monica H Schweinberger, Thomas S RoukisAbstract:Pin tract infection is one of the most frequently reported complications associated with the use of external fixation. Application of compression dressings to prevent motion at the pin-Skin Interface as well as periodic antiseptic cleansing of the pin sites has been advocated; however, no consensus has been reached on the most effective method of pin site care. This retrospective study was conducted to evaluate the effectiveness of a weekly, physician-directed pin site care protocol on reducing the rate of pin tract infections in a high-risk patient population.
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clinical research the effectiveness of physician directed external fixation pin site care in preventing pin site infection in a high risk patient population
2008Co-Authors: Monica H Schweinberger, Thomas S RoukisAbstract:Pin tract infection is one of the most frequently reported com- plications associated with the use of external fixation. Application of com- pression dressings to prevent motion at the pin-Skin Interface as well as peri- odic antiseptic cleansing of the pin sites has been advocated; however, no con- sensus has been reached on the most effective method of pin site care. This retrospective study was conducted to evaluate the effectiveness of a weekly, physician-directed pin site care pro- tocol on reducing the rate of pin tract infections in a high-risk patient population.
Michael W Hoffman - One of the best experts on this subject based on the ideXlab platform.
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A Low-Power, Single-Chip Electronic Skin Interface for Prosthetic Applications
IEEE transactions on biomedical circuits and systems, 2019Co-Authors: Joseph A Schmitz, Jonathan M Sherman, Samuel P Hansen, Samuel J Murray, Sina Balkir, Michael W HoffmanAbstract:A low-power, single-chip electronic Skin Interface is presented. The system on chip (SoC) implementation significantly reduces the physical footprint and power requirements compared to commercial Interfaces, which enables the creation nimble prosthetic limbs. Its small size and reduced battery requirements are ideal for advanced prosthetics that utilize electronic Skin to provide their user tactile feedback. The architecture consists of multiple charge-sensitive analog front ends (AFEs) Interfaced to a central, 16-bit microcontroller core which is capable of processing the sensory information in real time. Event-driven operation allows the chip to monitor all input channels while consuming minimal energy. A test chip has been fabricated in a 0.13 $\mu$ m CMOS technology and its functionality demonstrated by interfacing the chip to a prototype electronic Skin based on polyvinylidene fluoride (PVDF) piezoelectric sensors. Tactile signals from the sensors are measured and processed on-chip to calculate the corresponding charge. This is accomplished by programming the microcontroller with a custom software algorithm, granting the system the flexibility to Interface to different types of sensors. The single-chip electronic Skin system consumes 7.0 ${\mu {\rm W}}$ per channel and 93.5 ${\mu {\rm W}}$ in the example application when stimulated at 1 Hz, making it suitable for use with battery-powered prosthetics.
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a low power single chip electronic Skin Interface for prosthetic applications
International Symposium on Circuits and Systems, 2019Co-Authors: Joseph A Schmitz, Jonathan M Sherman, Samuel P Hansen, Samuel J Murray, Sina Balkir, Michael W HoffmanAbstract:A low-power, single-chip electronic Skin Interface is presented. Its small size and reduced battery requirements are ideal for advanced prosthetic limbs that utilize electronic Skin to provide their user tactile feedback. The architecture consists of multiple charge-sensitive analog front ends (AFEs) Interfaced to a central, 16-bit microcontroller core which is capable of processing the sensory information in real-time. Event-driven operation allows the chip to monitor all input channels while idle and consuming minimal energy. A test chip has been fabricated in a 0.13 µm CMOS technology and implements 13 AFE channels. Its functionality is demonstrated by interfacing the chip to a prototype electronic Skin based on polyvinylidene fluoride (PVDF) piezoelectric sensors. Signals from the sensors are captured by the presented chip and processed to calculate the corresponding charge. This is accomplished by programming the microcontroller with a custom software algorithm implemented in C, granting the system the flexibility to Interface to different types of sensors. The single-chip electronic Skin system consumes 7.0 µW per channel and 76.5 µW in the example application, making it suitable for use with battery-powered prosthetics.
Monica H Schweinberger - One of the best experts on this subject based on the ideXlab platform.
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the effectiveness of physician directed external fixation pin site care in preventing pin site infection in a high risk patient population
Foot and Ankle Specialist, 2008Co-Authors: Monica H Schweinberger, Thomas S RoukisAbstract:Pin tract infection is one of the most frequently reported complications associated with the use of external fixation. Application of compression dressings to prevent motion at the pin-Skin Interface as well as periodic antiseptic cleansing of the pin sites has been advocated; however, no consensus has been reached on the most effective method of pin site care. This retrospective study was conducted to evaluate the effectiveness of a weekly, physician-directed pin site care protocol on reducing the rate of pin tract infections in a high-risk patient population.
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clinical research the effectiveness of physician directed external fixation pin site care in preventing pin site infection in a high risk patient population
2008Co-Authors: Monica H Schweinberger, Thomas S RoukisAbstract:Pin tract infection is one of the most frequently reported com- plications associated with the use of external fixation. Application of com- pression dressings to prevent motion at the pin-Skin Interface as well as peri- odic antiseptic cleansing of the pin sites has been advocated; however, no con- sensus has been reached on the most effective method of pin site care. This retrospective study was conducted to evaluate the effectiveness of a weekly, physician-directed pin site care pro- tocol on reducing the rate of pin tract infections in a high-risk patient population.
Yanwen Y Duan - One of the best experts on this subject based on the ideXlab platform.
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towards conductive gel free electrodes understanding the wet electrode semi dry electrode and dry electrode Skin Interface impedance using electrochemical impedance spectroscopy fitting
Sensors and Actuators B-chemical, 2018Co-Authors: Sizhe Wang, Yanwen Y DuanAbstract:Abstract The electrode-scalp impedance of six subjects is studied by electrochemical impedance spectroscopy using three representative electrodes, namely wet electrodes, semi-dry electrodes, and dry electrodes. With the analysis of proposed equivalent models and area-normalized impedance (kΩ cm2), the specific electrode double layer resistances are 530 Ω cm2 for all electrodes, their specific contact resistances Res are 80 Ω cm2, 114 Ω cm2 and 20,077 Ω cm2, and their specific Skin resistances Rs are 867 Ω cm2, 1730 Ω cm2 and 46,145 Ω cm2 for these three representative electrodes respectively. When pressure was applied on dry electrodes, Res reduced by 47% and Rs reduced by 81%. When pressure was applied on semi-dry electrodes, Rs reduced by 50% (Res is not applicable for semi-dry electrodes). After application of scalp abrasion for dry electrodes, Res reduced by 36% and Rs reduced by 82%. After application of scalp abrasion for semi-dry electrodes, Rs reduced by 64%. Seeking novel Interface materials may break through the bottleneck for dry electrodes development in terms of integrated materials, mechanical support and electronic circuitry, while semi-dry electrodes have much development space to meet a balance of quick setup, comfortable wear, and satisfactory signal quality in many medical and out-clinic applications.
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towards gel free electrodes a systematic study of electrode Skin impedance
Sensors and Actuators B-chemical, 2017Co-Authors: Sizhe Wang, Yanwen Y DuanAbstract:Abstract Emerging real-world EEG applications require gel-free electrodes, which have to break through technical bottlenecks and achieve satisfactory electrode-Skin impedance. It is crucial to understand the electrical properties of the electrode-Skin Interface. In this work, the electrode-Skin impedance of bioelectrodes (wet, semi-dry, and dry) has been studied systemically, concerning not only magnitude but stability. Various factors have been investigated including types of electrodes, Skin locations, pressure, Skin abrasion, and electrode contact area. The electrode-Skin impedance always decreases in the following order: forearm, scalp and forehead for all electrodes. Compared with the impedances of wet electrodes and semi-dry electrodes, the dry electrode impedances are significantly higher (58.50 ± 64.16 kΩ cm 2 ) and unstable (impedance variation 31.2 ± 31.3 kΩ/10 min). Even worse, the dry electrode impedance variation between six subjects is considerably large (57.5–540.0 kΩ). As a result, no satisfactory EEG signals could be obtained. Moreover, the dry electrode impedances are lowered significantly under pressure or after Skin abrasion. Accordingly, alpha rhythms from the dry electrodes appeared with the assistance of pressure or Skin abrasion. These findings provide insights for the development of new gel-free electrodes to complement the emerging new EEG applications, such as brain-computer Interfaces and wearable EEGs.
Joseph A Schmitz - One of the best experts on this subject based on the ideXlab platform.
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A Low-Power, Single-Chip Electronic Skin Interface for Prosthetic Applications
IEEE transactions on biomedical circuits and systems, 2019Co-Authors: Joseph A Schmitz, Jonathan M Sherman, Samuel P Hansen, Samuel J Murray, Sina Balkir, Michael W HoffmanAbstract:A low-power, single-chip electronic Skin Interface is presented. The system on chip (SoC) implementation significantly reduces the physical footprint and power requirements compared to commercial Interfaces, which enables the creation nimble prosthetic limbs. Its small size and reduced battery requirements are ideal for advanced prosthetics that utilize electronic Skin to provide their user tactile feedback. The architecture consists of multiple charge-sensitive analog front ends (AFEs) Interfaced to a central, 16-bit microcontroller core which is capable of processing the sensory information in real time. Event-driven operation allows the chip to monitor all input channels while consuming minimal energy. A test chip has been fabricated in a 0.13 $\mu$ m CMOS technology and its functionality demonstrated by interfacing the chip to a prototype electronic Skin based on polyvinylidene fluoride (PVDF) piezoelectric sensors. Tactile signals from the sensors are measured and processed on-chip to calculate the corresponding charge. This is accomplished by programming the microcontroller with a custom software algorithm, granting the system the flexibility to Interface to different types of sensors. The single-chip electronic Skin system consumes 7.0 ${\mu {\rm W}}$ per channel and 93.5 ${\mu {\rm W}}$ in the example application when stimulated at 1 Hz, making it suitable for use with battery-powered prosthetics.
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a low power single chip electronic Skin Interface for prosthetic applications
International Symposium on Circuits and Systems, 2019Co-Authors: Joseph A Schmitz, Jonathan M Sherman, Samuel P Hansen, Samuel J Murray, Sina Balkir, Michael W HoffmanAbstract:A low-power, single-chip electronic Skin Interface is presented. Its small size and reduced battery requirements are ideal for advanced prosthetic limbs that utilize electronic Skin to provide their user tactile feedback. The architecture consists of multiple charge-sensitive analog front ends (AFEs) Interfaced to a central, 16-bit microcontroller core which is capable of processing the sensory information in real-time. Event-driven operation allows the chip to monitor all input channels while idle and consuming minimal energy. A test chip has been fabricated in a 0.13 µm CMOS technology and implements 13 AFE channels. Its functionality is demonstrated by interfacing the chip to a prototype electronic Skin based on polyvinylidene fluoride (PVDF) piezoelectric sensors. Signals from the sensors are captured by the presented chip and processed to calculate the corresponding charge. This is accomplished by programming the microcontroller with a custom software algorithm implemented in C, granting the system the flexibility to Interface to different types of sensors. The single-chip electronic Skin system consumes 7.0 µW per channel and 76.5 µW in the example application, making it suitable for use with battery-powered prosthetics.
