scholarly journals Micropower Impulse Radar: A Novel Technology for Rapid, Real-Time Detection of Pneumothorax

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Phillip D. Levy ◽  
Tracey Wielinski ◽  
Alan Greszler
Keyword(s):  
Point Of Care ◽  
Hospital Setting ◽  
Wide Band ◽  
X Rays ◽  
Frequency Range ◽  
Emergency Situations ◽  
Novel Technology ◽  
Adequate Information ◽  
Post Market ◽  
Current Standards

Pneumothorax detection in emergency situations must be rapid and at the point of care. Current standards for detection of a pneumothorax are supine chest X-rays, ultrasound, and CT scans. Unfortunately these tools and the personnel necessary for their facile utilization may not be readily available in acute circumstances, particularly those which occur in the pre-hospital setting. The decision to treat therefore, is often made without adequate information. In this report, we describe a novel hand-held device that utilizes Micropower Impulse Radar to reliably detect the presence of a pneumothorax. The technology employs ultra wide band pulses over a frequency range of 500 MHz to 6 GHz and a proprietary algorithm analyzes return echoes to determine if a pneumothorax is present with no user interpretation required. The device has been evaluated in both trauma and surgical environments with sensitivity of 93% and specificity of 85%. It is has the CE Mark and is available for sale in Europe. Post market studies are planned starting in May of 2011. Clinical studies to support the FDA submission will be completed in the first quarter of 2012.

Microwave wide band absorption by carbon from Corn cob-1

2016 ◽  
Vol 12 (2) ◽  
pp. 4204-4212 ◽  
Author(s):  
Maheshwar Sharon ◽  
Ritesh Vishwakarma ◽  
Abhijeet Rajendra Phatak ◽  
Golap Kalita ◽  
Nallin Sharma ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Agricultural Waste ◽  
Wide Band ◽  
Nickel Nitrate ◽  
Equivalent Amount ◽  
Frequency Range ◽  
Corn Cob ◽  
Different Temperatures ◽  
Band Absorption ◽  
5 Ghz

Corn cob, an agricultural waste, is paralyzed at different temperatures (700oC, 800oC and 900oC). Microwave absorption of carbon in the frequency range of 2 GHz to 8 GHz is reported. Carbon activated  with 5%  nickel nitrate showed more than 90% absorption of microwave in the frequency range from 6 GHz to 8 GHz, while carbon activated  with 10% Nickel nitrate treated corn cob showed 90% absorption  in the frequency range of 2.5 GHz to 5 GHz. Carbon showing the best absorption are characterized by XRD, Raman spectra and SEM . It is suggested that corn cob treatment   alone with KOH did not improve the microwave absorption, whereas treatment along with nickel nitrate improved the absorption property much better. It is proposed that treatment with nickel nitrate helps in creating suitable pores in carbon   which improved the absorption behavior because while treating carbon with 1N HCl helps to leach out nickel creating equivalent amount of pores in the carbon.

scholarly journals Band notched self complementaryultra wideband antenna for wireless applications

2018 ◽  
Vol 7 (2.8) ◽  
pp. 529 ◽  
Author(s):  
Ch Ramakrishna ◽  
G A.E.Satish Kumar ◽  
P Chandra Sekhar Reddy
Keyword(s):  
High Frequency ◽  
Return Loss ◽  
Wide Band ◽  
Ultra Wideband ◽  
Impedance Bandwidth ◽  
Relative Dielectric Permittivity ◽  
Frequency Range ◽  
Ground Structure ◽  
Wireless Applications ◽  
Patch Edge

This paper presents a band notched WLAN self complementaryultra wide band antenna for wireless applications. The proposed antenna encounters a return loss (RL) less than -10dB for entire ultra wideband frequency range except band notched frequency. This paper proposes a hexagon shape patch, edge feeding, self complementary technique and defective ground structure. The antenna has an overall dimensionof 28.3mm × 40mm × 2mm, builton  substrate FR4 with a relative dielectric permittivity 4.4. And framework is simulated finite element method with help of high frequency structured simulator HFSSv17.2.the proposed antenna achieves a impedance bandwidth of 8.6GHz,  band rejected WLAN frequency range 5.6-6.5 GHz with  vswr is less than 2.

scholarly journals Clinical performance evaluation of SARS-CoV-2 rapid antigen testing in point of care usage in comparison to RT-qPCR

2021 ◽  
Author(s):  
Isabell Wagenhaeuser ◽  
Kerstin Knies ◽  
Vera Rauschenberger ◽  
Michael Eisenmann ◽  
Miriam McDonogh ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Viral Load ◽  
Clinical Performance ◽  
Point Of Care ◽  
Hospital Setting ◽  
High Viral Load ◽  
Evaluation Study ◽  
Study Cohort ◽  
Protein Variant ◽  
Atypical Symptoms

Background Antigen rapid diagnostic tests (RDT) for SARS-CoV-2 are fast, broadly available, and inexpensive. Despite this, reliable clinical performance data is sparse. Methods In a prospective performance evaluation study, RDT from three manufacturers (NADAL, Panbio, MEDsan) were compared to quantitative reverse transcription polymerase chain reaction (RT-qPCR) in 5 068 oropharyngeal swabs for detection of SARS-CoV-2 in a hospital setting. Viral load was derived from standardized RT-qPCR Cycle threshold (Ct) values. The data collection period ranged from November 12, 2020 to February 28, 2021. Findings Overall, sensitivity of RDT compared to RT-qPCR was 42.57% (95% CI 33.38%-52.31%), and specificity 99.68% (95% CI 99.48%-99.80%). Sensitivity declined with decreasing viral load from 100% in samples with a deduced viral load of 10^8 SARS-CoV-2 RNA copies per ml to 8.82% in samples with a viral load lower than 104 SARS-CoV-2 RNA copies per ml. No significant differences in sensitivity or specificity could be observed between the three manufacturers, or between samples with and without spike protein variant B.1.1.7. The NPV in the study cohort was 98.84%; the PPV in persons with typical COVID-19 symptoms was 97.37%, and 28.57% in persons without or with atypical symptoms. Interpretation RDT are a reliable method to diagnose SARS-CoV-2 infection in persons with high viral load. RDT are a valuable addition to RT-qPCR testing, as they reliably detect infectious persons with high viral loads before RT-qPCR results are available. Funding German Federal Ministry for Education and Science (BMBF), Free State of Bavaria

scholarly journals Particle dynamics in the stellar magnetosphere by gravitational collapse

2010 ◽  
Vol 6 (S271) ◽  
pp. 383-384
Author(s):  
Volodymyr Kryvdyk
Keyword(s):  
Thermal Radiation ◽  
Gravitational Collapse ◽  
Radiation Flux ◽  
Gamma Ray ◽  
Wide Band ◽  
Particle Dynamics ◽  
X Rays ◽  
Relativistic Jets ◽  
Stellar Radius ◽  
Polar Caps

AbstractThe particle dynamics and in the stellar magnetosphere during gravitational collapse is investigated. The formations of relativistic jets and the generation of the radiation bursts in the stellar magnetosphere by gravitational collapse are considered. As follows from results, the stars on the stage of gravitational collapse must be powerful sources of the relativistic jets and the non-thermal radiation. These jets will formed in the polar caps of collapsing stars magnetospheres, when the stellar magnetic field increases during collapse and the charged particles will be accelerate. These jets will generate the non-thermal radiation. The radiation flux grows with decreasing stellar radius and can be observed in the form of radiation burst in wide band wave- from radio to gamma-ray. These bursts radiation can be observed as gamma- and X- rays bursts.

A Multiple-Bands Metamaterial Absorber Based in X, Ku and K-Band

2021 ◽  
Author(s):  
Muhammad Fahim Zafar ◽  
Usman Masud
Keyword(s):  
Single Layer ◽  
Wide Band ◽  
Metamaterial Absorber ◽  
Basic Unit ◽  
Frequency Range ◽  
Structure Form ◽  
Perfect Absorption ◽  
Polarization Insensitive ◽  
Band Absorption ◽  
K Band

Abstract Developing a highly efficient and multiple-bands metamaterial absorber is a hot issue in recent era. In this paper, A multiple-bands metamaterial absorber has been presented which is based in X, Ku and K-band. Firstly, we have designed two single layer basic unit cell of X-shape and cross-shape, then they are arranged in the multi-layers structure form for the purpose of obtaining multiple- bands and wide band absorption. The proposed absorber is able to work in multiple bands because it has six peaks in the frequency range of 8–24 GHz with having near perfect absorption. Moreover, the sixth peak has a wideband absorption which is 2.93 GHz. Furthermore, the proposed absorber is also tested for polarization insensitivity and also for oblique incidence. Absorption was found polarization insensitive with almost perfect absorption.

scholarly journals Improving access to new diagnostics through harmonised regulation: priorities for action

2014 ◽  
Vol 3 (1) ◽  
Author(s):  
Ruth McNerney ◽  
Kimberly Sollis ◽  
Rosanna W. Peeling
Keyword(s):  
Developing Countries ◽  
Diagnostic Tests ◽  
Clinical Performance ◽  
Point Of Care ◽  
Poor Quality ◽  
International Standards ◽  
Regulatory Oversight ◽  
Adoption And Implementation ◽  
Post Market ◽  
Timely Access

A new generation of diagnostic tests is being developed for use at the point of care that could save lives and reduce the spread of infectious diseases through early detection and treatment. It is important that patients in developing countries have access to these products at affordable prices and without delay. Regulation of medical products is intended to ensure safety and quality whilst balancing the need for timely access to beneficial new products. Current regulatory oversight of diagnostic tests in developing countries is highly variable and weak regulation allows poor-quality tests to enter the market. However, inefficient orover zealous regulation results in unnecessary delays, increases costs and acts as a barrier to innovation and market entry. Setting international standards and streamlining the regulatory process could reduce these barriers. Four priority activities have been identified where convergence of standards and protocols or joint review of data would be advantageous: (1) adoption of a common registration file for pre-market approval; (2) convergence of quality standards for manufacturing site inspections; (3) use of common evaluation protocols, aswell as joint review of data, to reduce unnecessary duplication of lengthy and costly clinical performance studies; and (4) use of networks of laboratories for post-market surveillance in order to monitor ongoing quality of diagnostic devices. The adoption and implementation of such measures in developing countries could accelerate access to new diagnostic tests that are safe and affordable.

scholarly journals Pediatric septic arthritis of the hip: the benefit of hip arthroscopy by extracapsular (outside-in) approach

2020 ◽  
Vol 8 (2_suppl) ◽  
pp. 2325967120S0001
Author(s):  
Nicolas Jan ◽  
Julien Pietrzak ◽  
Matthieu Baudoux ◽  
Arnaud Kaba
Keyword(s):  
Septic Arthritis ◽  
Hip Arthroscopy ◽  
Weight Bearing ◽  
Needle Aspiration ◽  
High Rate ◽  
Peripheral Compartment ◽  
X Rays ◽  
Quick Method ◽  
Emergency Situations ◽  
Tensor Fasciae Latae

Background: Pediatric septic arthritis of the hip is a surgical emergency. Facing a hip flexum and fever, surgeons can use comparative ultrasound to confirm the diagnosis and to establish the surgical indication. While needle aspiration-irrigation is a simple and quick method, it gives rise to a high rate of recurrence. The purpose of our study was to demonstrate that hip arthroscopy by extracapsular approach is an effective and accessible alternative applicable in emergency situations. Methods: This is a report of 2 cases (7 years-135 cm; 13 years-143 cm) of needle aspiration-irrigation failure subsequently treated by hip arthroscopy. The X-ray and arthroscopy-assisted extracapsular technique was performed on a conventional orthopedic table, using a 30 degree arthroscope and a 3.5mm diameter motorized knife. Minimally invasive anterior longitudinal capsulotomy was performed by 2 anterolateral approaches via the proximal and distal tensor Fasciae Latae muscle, without dedicated instrumentation, followed by sampling, irrigation, removal of false membranes, synovial biopsies, partial synovectomy, cartilage assessment of the central then peripheral compartment and placement of a drainage. Results: In both cases, effusion completely disappeared and the inflammatory process gradually normalized with antibiotic therapy without any repeat procedure or complications related to the approach. Weight bearing was resumed in 3 weeks. Postoperatively, in 6 months and 15 months respectively, after resumption of sports activities hip examination was painless and no damage was noted on x-rays in either case. Conclusion: In our experience, hip arthroscopy by extracapsular approach can effectively address cases of failed needle aspiration-irrigation in pediatric septic arthritis of the hip. It could be provided as first-line emergency treatment in the event of purulent septic arthritis or late management, as a replacement for arthrotomy.

scholarly journals Wide-Band Tunerless Mixer Mounts for 100 GHz and 150 GHz SIS receivers

1994 ◽  
Vol 140 ◽  
pp. 78-81
Author(s):  
K. Sunada ◽  
R. Kawabe ◽  
J. Inatani
Keyword(s):  
Noise Temperature ◽  
Wide Band ◽  
Wide Frequency Range ◽  
Low Noise ◽  
Frequency Range ◽  
Sis Receiver ◽  
Embedding Impedance

AbstractThe performance of the new SIS receiver systems at the Nobeyama Millimeter Array are described. These receivers operate at 100 GHz and 150 GHz bands and tunerless mixer mounts have been adopted. These receivers show very low noise temperature (< 50 K) over a very wide frequency range because of the large embedding impedance range.

scholarly journals Introducing point-of-care testing into a rural hospital setting: thematic analysis of interviews with providers

2010 ◽  
Vol 2 (1) ◽  
pp. 54 ◽  
Author(s):  
Katharina Blattner ◽  
Garry Nixon ◽  
Chrystal Jaye ◽  
Susan Dovey
Keyword(s):  
Rural Community ◽  
Thematic Analysis ◽  
Professional Education ◽  
Point Of Care ◽  
Hospital Setting ◽  
Daily Practice ◽  
Care Providers ◽  
Diagnostic Certainty ◽  
Care Systems ◽  
Education Gaps

INTRODUCTION: Hauora Hokianga Enterprises Trust, an integrated Primary Health Organisation (PHO), which provides primary and intermediate/secondary care to a remote rural community, introduced point-of-care (POC) testing at Rawene Hospital in June 2008. Previously, all laboratory tests were undertaken in Whangarei, with a one to three day turn-around for results. This study aimed to identify the perceived impact of POC testing on clinicians and the community. METHOD: Face-to-face interviews were conducted with 13 health professionals working at Rawene Hospital. The qualitative data analysis computer programme Atlas.ti v5.2 was used to assist the thematic analysis. FINDINGS: Three overall themes captured the main issues with introducing POC testing: (1) POC testing increased clinicians’ confidence, certainty and assurance in their daily practice; (2) POC testing improved diagnostic certainty and this impacted on patients and their families/whanau; (3) the challenges associated with POC testing included increased workload, pressure to up-skill, over-testing, and continuing professional education gaps. CONCLUSION: POC testing is an invaluable technological adjunct for improving clinical decisions and culturally safe care provided to a remote rural community, but it brings challenges to care providers in managing higher workloads and pressures to up-skill. POC testing can improve the acute medical care (access and quality) provided to an economically-deprived, predominantly Maori, rural community. KEYWORDS: Hospitals, rural; point-of-care systems; rural health

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